CN108348890B - Porous carbon and organic halide removal device using same - Google Patents

Porous carbon and organic halide removal device using same Download PDF

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CN108348890B
CN108348890B CN201680063260.0A CN201680063260A CN108348890B CN 108348890 B CN108348890 B CN 108348890B CN 201680063260 A CN201680063260 A CN 201680063260A CN 108348890 B CN108348890 B CN 108348890B
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porous carbon
organic halide
volume
particle size
bamboo
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CN108348890A (en
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渋谷和幸
山田心一郎
木村和浩
武隈宏史
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Dexerials Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28057—Surface area, e.g. B.E.T specific surface area
    • B01J20/28059—Surface area, e.g. B.E.T specific surface area being less than 100 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
    • B01J20/28073—Pore volume, e.g. total pore volume, mesopore volume, micropore volume being in the range 0.5-1.0 ml/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078—Pore diameter
    • B01J20/2808—Pore diameter being less than 2 nm, i.e. micropores or nanopores
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/36—Organic compounds containing halogen

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Carbon And Carbon Compounds (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The present invention aims to provide a porous carbon which has excellent adsorption performance for low-molecular-weight compounds such as organic halides and is less likely to have reduced adsorption performance even when the liquid passage ratio is large. The porous carbon is characterized by a mesopore volume of 0.07 (cm)3A differential volume maximum value of 0.4 to 0.6nm in pore diameter of 1.6 nm or more.

Description

Porous carbon and organic halide removal device using same
Technical Field
The present invention relates to porous carbon and an organic halide removal device using the porous carbon.
Background
Porous carbon represented by activated carbon has been widely used for various purposes such as removal of offensive odor, removal of impurities in liquid, recovery and removal of solvent vapor, and the like because of its excellent adsorption performance. In particular, activated carbon is used in water purifiers for purifying water (see, for example, patent documents 1 and 2).
However, it is difficult to sufficiently adsorb low-molecular-weight compounds such as organic halides to coconut shell activated carbon generally used.
In such a conventional water purifier, there is a problem that the water purifying function cannot be sufficiently exhibited in some cases if the liquid passing ratio is large, that is, if the total amount of water flowing through the water purifier is large.
Therefore, it is desired to provide porous carbon which is excellent in adsorption performance to low molecular weight compounds such as organic halides and which is less likely to suffer a decrease in adsorption performance even when the liquid passage ratio is large, and which can be used for a water purifier.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2001 and 205253
Patent document 2: japanese laid-open patent publication No. H06-106161
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-described problems of the prior art and to achieve the following objects.
That is, an object of the present invention is to provide porous carbon which has excellent adsorption performance for low-molecular-weight compounds such as organic halides and in which the adsorption performance is less likely to be lowered even when the liquid passage ratio is large.
Means for solving the problems
The means for solving the problem are as follows.
Namely,<1>A porous carbon characterized by a mesopore volume of 0.07 (cm)3A maximum value of differential volume of 0.4 to 0.6nm in pore diameter of 1.6 nm or more per g).
<2>According to the above<1>The porous carbon, wherein the specific surface area of the porous carbon measured by the BET nitrogen adsorption method is 10 (m)2(g) above.
<3>According to the above<1>Or<2>The porous carbon, wherein the porous carbon has a total pore volume of 0.5 (cm)3(g) above.
<4> the porous carbon according to any one of <1> to <3> above, wherein a particle diameter of primary particles of the porous carbon is 0.425(mm) or less.
<5>According to the above<1>To<4>The porous carbon according to any one of the preceding claims, wherein the porous carbon has a micropore volume of 0.5 (cm)3(g) above.
<6> the porous carbon according to <4> or <5> above, wherein a particle diameter of primary particles of the porous carbon is 0.1(mm) or less.
<7> the porous carbon according to any one of <1> to <6> above, wherein a raw material of the porous carbon is composed of a plant-derived material.
<8> the porous carbon according to <7>, wherein the plant-derived material is a bamboo-derived material derived from Gramineae.
<9> the porous carbon according to <8> above, wherein the bamboo belonging to the family Gramineae is Phyllostachys pubescens.
<10> an organic halide removal apparatus, characterized by comprising: a filter comprising the porous carbon according to any one of the above <1> to <9 >.
<11> the organic halide removal apparatus according to <10> above, wherein the removal rate of the organic halide is 90% or more when the organic halide is removed from water containing the organic halide at a concentration of 0.06mg/L at a liquid introduction ratio of 1,000 times.
<12> the organic halide removal apparatus according to <10> or <11>, wherein the removal rate of the organic halide is 65% or more when the organic halide is removed from water containing the organic halide at a concentration of 0.06mg/L at a liquid introduction rate of 3,000 times.
<13> the organic halide removal apparatus according to any one of <10> to <12> above, wherein the removal rate of the organic halide is 50% or more when the organic halide is removed from water containing the organic halide at a concentration of 0.06mg/L at a liquid introduction ratio of 6,000 times.
<14> the organic halide removal device according to any one of <11> to <13> above, wherein the organic halide is chloroform.
Effects of the invention
The present invention can solve the above-described problems of the prior art and achieve the above-described object, and can provide a porous carbon which has excellent adsorption performance for low-molecular-weight compounds such as organic halides and in which the adsorption performance is less likely to be lowered even when the liquid passage ratio is large.
Detailed Description
(porous carbon)
The porous carbon of the present invention has a mesopore volume of 0.07 (cm)3A maximum value of differential volume of 0.4 to 0.6nm in pore diameter of 1.6 nm or more per g).
The inventors of the present invention found that: the porous carbon having the above characteristics is excellent in adsorption performance to low molecular weight compounds such as organic halides, and is less likely to suffer from a decrease in adsorption performance even when the liquid passage ratio is large.
The porous carbon of the present invention has many fine pores (pores). The pores are divided into mesopores, micropores and macropores. Herein, mesopores mean micropores having a pore diameter of 2nm to 50 nm; micropore refers to a pore with a pore diameter of less than 2 nm; macropores are pores with a pore diameter of more than 50 nm.
The macropores serve as channels for water, air, and the like containing impurities and have a function of introducing and adsorbing the impurities to and from the mesopores/micropores, and therefore the macropores have a certain volume. However, if the macropores are too large, adsorption of low molecular weight substances is not facilitated. The micropores are effective for adsorbing low molecular weight substances, but tend to have a decreased adsorption performance particularly when the liquid passage ratio is large. On the other hand, if the mesopore volume is large, low-molecular-weight substances can be efficiently adsorbed, and even if the liquid passage ratio is increased to some extent, the adsorption performance is less likely to be deteriorated. Further, when the maximum differential volume of the pore diameter of 0.4nm to 0.6nm is 1.6 or more, the low molecular weight substance can be adsorbed particularly effectively. Therefore, the porous carbon having the above characteristics is excellent in the adsorption performance for low-molecular weight compounds such as organic halides, and can satisfy any effect without lowering the adsorption performance even when the liquid passage magnification is large.
< characteristics of the porous carbon of the present invention >
In order to ensure good adsorption performance, the porous carbon preferably has the following characteristics.
Preferably, the specific surface area of the porous carbon measured by the BET nitrogen adsorption method is 10 (m)2(g) above.
Preferably, the total pore volume in the porous carbonIs 0.5 (cm)3(g) above.
The particle diameter of the primary particles of the porous carbon is preferably 0.425(mm) or less, and more preferably 0.1(mm) or less. In order to facilitate contact of the fine pores with water, air, or the like containing impurities, the primary particles preferably have a particle diameter of 0.425(mm) or less. Further, the primary particles of the porous carbon may be subjected to secondary aggregation, and if not to a degree that the performance thereof is degraded, the porous carbon may be formed into a granular shape or a sheet shape.
Further, since the porous carbon has a large pore volume effective for adsorption of the low molecular weight substance to be the object of the present invention, the porous carbon preferably has a pore volume of 0.5 (cm)3(g) above.
< method for measuring characteristics >
The characteristics of the porous carbon can be measured using, for example, the following apparatus.
The nitrogen adsorption isotherm was measured using 3FLEX manufactured by Micromeritics Japan, the specific surface area was calculated by the BET method, the total pore volume was calculated by the single-point adsorption method, the mesopore volume was calculated by the BJH method, the micropore volume was calculated by the HK method, and the pore distribution in the micropore region was calculated by the DFT method. Further, the pore distribution in the micropore region is obtained by the DFT method, and the maximum differential volume value of the pore diameter of 0.4nm to 0.6nm can be calculated.
[ specific measurement method ]
30mg of porous carbon subjected to the carbonization treatment and the activation treatment was prepared, and the surface area, the total pore volume, the mesopore volume, the micropore volume, and the pore distribution in the micropore region were measured using 3FLEX under the measurement condition in which the relative pressure (P/P0) was set to be in the range of 0.0000001 to 0.995.
The particle size of the primary particles of the porous carbon can be determined by using a laser diffraction/scattering particle size distribution measuring apparatus LA-950 (manufactured by HORIBA). The particle size distribution in the range of 0.01 μm to 3,000 μm was measured by a wet method using LA-950. The particle size of the primary particles of the porous carbon is a particle size (median particle size) corresponding to the central value of the distribution in a particle size distribution in which the horizontal axis represents the particle size and the vertical axis represents the number frequency.
< porous carbon Material >
Preferably, the starting material of the porous carbon is a plant-derived material. If it is derived from a plant, it is easy to adjust the volume values of the mesopores and micropores to the above desired values. In addition, the plant-derived products are advantageous from the viewpoint of reducing environmental load.
The plant-derived material is not particularly limited and may be appropriately selected according to the purpose, but a material derived from bamboo of the family gramineae is more preferable.
Specific examples of the gramineous bamboo include bamboos of the genus phyllostachys (phyllostachys pubescens); bono (Shibataea); genus Tetragonocalamus (Tetragonocalamus); genus phyllostachys (semiaquilaria kagamiana), phyllostachys praecox, melanarhia (japanese transliteration), bamboos gemini (semiaquilaria maruyamana), bamboos plantaginea (semiaquilaria okuboi), phyllostachys pubescens (semiaquilaria tatebeaana), bamboos nocarpus (semiaquilaria yashadake), phyllostachys praecox (semiaquilaria yoshi-matsumura), and phyllostachys praecox ()); donobambusa totosik (donobambusa totosik) genus (donobambusa); the genus Phyllostachys nigra (Pseudosasa) (Vanajiu island Phyllostachys nigra, Phyllostachys nigra (Pseudosasa japonica f. pleioblastoides), and Phyllostachys nigra (Pseudosasa japonica v. tsutsutsumiana)); bamboo grass (Sasaella) genus (Sasaella reikoana), Xiao avena (Sasaella reikoana), Shang avena (Sasaella bitchuensis), Yan bamboo (Sasaella masamunena), Arnundia muiaana Koidz (academic name), maezawazasa (Japanese transliteration), shou Wei drawer (Sasaella suwekona)); the term "raw material" includes, but is not limited to, the genus Sasa albo-marginata (Sasa megalophylla), the solar tray (Sasa chartaceae v. na), the Sasa septicerialis v. membraneaca (school name), the rokkomiyamazaa (Japanese transliteration), the Neosasamorpha shimidana subsp. shimidana (school name), the Neosasamiana kagamia subsp. kagamiana (school name), the Sasa septicerialis v. septorialis (school name), the Sasa senansensis v. senensis f. nobilis (school name), the Sasa palea (school name), the Sasa pacifica (school name), the Sausarea (Japanese transliteration), the Sasa, the Sausarea), the Sausarea (school name), the Sausarea (Japanese transliteration), the Sausarea (school name), the Sausarea (Japanese (national root of the plant), the Sausarea (Japanese transliteration), the Sausarea (Japanese (national root of the plant, the Sausarea), the Sasa pacifia (scientific name of the Sausarea), the plant (plant, the plant of the; genus Phyllostachys; large bamboo genus (Pleioblastus) (Pleioblastus linearis), Pleioblastus asiaticus (Pleioblastus hindsii), Pleioblastus asiaticus (Pleioblastus asiaticus), Pleioblastus simonii (academic name), Pleioblastus simonii v. heteremophyllus (academic name), Pleioblastus chino f. pulilis (academic name), Pleioblastus humulis (academic name), Pleioblastus pygmaeus (academic name), Pleioblastus shibuyanus (academic name)); bambumease (sorni-bamboo (Japanese transliteration)); zizhu genus; pengla bamboo (Pengla bamboo, Zhu bamboo, Taishan bamboo) and so on.
Among them, the bamboo family of the family Gramineae is more preferably of the genus Phyllostachys (Phyllostachys pubescens).
In particular, porous carbon used as a raw material of Phyllostachys pubescens is easy to adjust the pores.
< method for producing porous carbon >
The porous carbon of the present invention is produced by subjecting the porous carbon to a carbonization treatment and an activation treatment.
The carbonization treatment is baking (dry distillation) at an intermediate temperature (300 to 1000 ℃) in an oxygen-free state, and the activation treatment is to add pores to develop the pore structure of the carbon material. The activation treatment is to dry distill the carbide for a certain period of time at a high temperature (800 to 1,400 ℃) using water vapor, carbon dioxide or the like, thereby increasing the surface area per unit mass.
By appropriately adjusting the carbonization treatment conditions or the activation treatment conditions, porous carbon exhibiting a desired mesopore volume and a differential volume maximum value of a pore diameter of 0.4nm to 0.6nm can be obtained.
When the material is, for example, a bamboo material derived from gramineae, adjusting the particle size of the bamboo powder supplied to the carbonization treatment is also an effective means for obtaining desired porous carbon. Specifically, it is preferable to subject a bamboo fine powder having a particle size of 5 μm to 30mm to carbonization treatment, and it is more preferable to subject a bamboo fine powder having a particle size of 5 μm to 5mm to carbonization treatment. In addition, the carbonization treatment conditions and the activation treatment conditions in this case are, specifically, preferably performed at a carbonization temperature of 400 to 1000 ℃ for 1 to 10 hours. The activation treatment is preferably carried out at an activation temperature of 800 to 1000 ℃ for 0.5 to 10 hours, more preferably for 0.5 to 5 hours, and still more preferably for 0.5 to 2 hours, with steam.
(organic halide removal apparatus)
The organic halide removal device of the present invention comprises: a filter comprised of said porous carbon.
The method for removing an organic halide according to the present invention is a method for removing an organic halide by adsorbing an organic halide to the porous carbon using the organic halide removal device.
More specifically, the porous carbon material is used as a filter for water purification, and water containing organic halide impurities is passed through the filter to remove the organic halide.
In this case, the packing density of the porous carbon material packed in the filter is preferably 0.2g/cm3The above.
According to the organic halide removal device of the present invention, since the organic halide can be effectively removed, high adsorption performance can be maintained even when the liquid passing magnification is large. When the organic halide removal apparatus of the present invention is used, the organic halide can be removed at a high removal rate even under the condition that the liquid passing ratio is 1,000 times, more preferably 3,000 times, and still more preferably 6,000 times.
Specifically, when the organic halide removal apparatus of the present invention is used to remove an organic halide from water containing an organic halide at a concentration of 0.06mg/L under a condition that the liquid passing ratio is 1,000 times, the removal rate is 90% or more. The removal rate is 65% or more, more preferably 70% or more, under the condition that the liquid passing ratio is 3,000 times. Under the condition that the liquid passing ratio is 6,000 times, the removal rate is 50% or more, and more preferably 65% or more.
In the present invention, the organic halide is preferably chloroform as a compound to be removed. The organic halide removal device of the present invention has an excellent chloroform removal effect.
Examples
The following examples of the present invention are illustrative, but the present invention is not limited to these examples.
(example 1)
Rice husks were used as raw materials. The carbonized rice husk (manufactured by echo corporation) was subjected to acid treatment or alkali treatment, and then to activation treatment with steam at 960 ℃ for 1 hour, to obtain activated carbon 1.
The conditions for producing activated carbon 1 are shown in table 1 below. In addition, various properties of the activated carbon 1 were measured by the above-described measurement method using an apparatus of 3FLEX (Micromeritics, japan ltd.). The results are shown in Table 2-1 below.
< chloroform removal test >
The concentration of chloroform in the sample water was adjusted to 0.06. + -. 0.006 mg/L. Furthermore, 1mL (80 mm long) of a test tube having an inner diameter of 4mm was filled with activated carbon 1. The sample water was passed through an activated carbon packed column at a temperature of 20 ℃ and a liquid passing rate of 1,000. The sample water flowing out of the activated carbon packed column was collected, and the concentration of chloroform was quantitatively determined by gas chromatography. The sample water before passing through the column and the sample water after passing through the activated carbon layer of the column were compared, and the removal rate was determined.
The term "liquid passing ratio (double)" as used herein means the ratio of the volume of sample water to the volume of activated carbon after passing through the membrane for a certain period of time. The chloroform removal rate when the flow rate is 1,000 times is a removal rate when the chloroform aqueous solution is passed at a space velocity SV of 2,000 (unit: 1/h) and at a flow rate (flow rate volume/activated carbon volume) of 1,000 times, that is, a removal rate when 1,000mL of the chloroform aqueous solution is passed over 1mL of activated carbon.
Then, the removal rates at the liquid passing ratios of 3,000 times and 6,000 times were determined in the same manner as in the case where the liquid passing ratio was 1,000 times. The results are shown in Table 2-1 below.
(example 2)
Bamboo produced in china was used as a raw material. The carbonized bamboo chips (manufactured by general co., ltd.) were subjected to activation treatment with steam at 900 ℃ for 1 hour to obtain activated carbon 2.
The conditions for producing activated carbon 2 are shown in table 1 below. Various characteristics of activated carbon 2 were measured by the same method as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-1 below.
(example 3)
Phyllostachys pubescens produced in Jiuzhou was used as a raw material. The fine Bamboo powder (particle size (nominal) 5 to 500 μm, manufactured by Bamboo Techni) was carbonized at 600 ℃ for 6 hours and then activated with steam at 900 ℃ for 3 hours to obtain activated carbon 3.
The conditions for producing the activated carbon 3 are shown in table 1 below. Various characteristics of the activated carbon 3 were measured by the same method as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-1 below.
(example 4)
Phyllostachys pubescens produced in Jiuzhou was used as a raw material. The powder of Bamboo (particle size (nominal) 0.1mm to 0.4mm, manufactured by Bamboo Techni) was carbonized at 600 ℃ for 6 hours and then activated at 900 ℃ for 3 hours with steam to obtain activated carbon 4.
The conditions for producing the activated carbon 4 are shown in table 1 below. Various characteristics of the activated carbon 4 were measured by the same method as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-1 below.
(example 5)
Phyllostachys pubescens produced in Jiuzhou was used as a raw material. The powder of Bamboo (particle size (nominal) 0.1mm to 0.4mm, manufactured by Bamboo Techni) was carbonized at 600 ℃ for 6 hours and then activated at 900 ℃ for 1 hour with steam to obtain activated carbon 5.
The conditions for producing the activated carbon 5 are shown in table 1 below. Various characteristics of the activated carbon 5 were measured by the same method as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-2 below.
(example 6)
Phyllostachys pubescens produced in Jiuzhou was used as a raw material. The fine Bamboo powder (particle size (nominal) 5 to 500 μm, manufactured by Bamboo Techni) was carbonized at 600 ℃ for 6 hours and then activated with steam at 900 ℃ for 1 hour to obtain activated carbon 6.
The conditions for producing the activated carbon 6 are shown in table 1 below. Various characteristics of the activated carbon 6 were measured by the same method as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-2 below.
Comparative example 1
Coconut shells were used as the starting material. And comparative activated carbon 1(CN240G, manufactured by kamurakamura chemical corporation) using coconut shell was used, and various properties of comparative activated carbon 1 were measured by the same method as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-2 below.
Comparative example 2
Coconut shells were used as the starting material. And comparative activated carbon 2(Kuraray GW, manufactured by clony chemical co., ltd.) using coconut shells was used, and various properties of comparative activated carbon 2 were measured in the same manner as in example 1. Further, the removal rate of chloroform was also determined. The results are shown in Table 2-2 below.
[ Table 1]
Figure BDA0001643785620000081
[ Table 2-1]
Example 1 Example 2 Example 3 Example 4
Raw material Rice husk Bamboo Bamboo Bamboo
Mesopore volume (cm)3/g) 0.5 0.08 0.13 0.15
Differential volume maximum with pore diameter of 0.4-0.6 nm 1.63 2.05 1.76 1.77
BET specific surface area (m)2/g) 1002 1132 1482 1450
Total pore volume (cm)3/g) 0.78 0.53 0.73 0.71
Micropore volume (cm)3/g) 0.4 0.458 0.61 0.58
Particle diameter of Primary particle (mm) 0.12 0.197 0.05 0.24
Packing Density (cm)3/g) 0.097 0.3 0.2 0.24
Removal Rate (%) at a liquid passing multiple of 1,000 times 93 94 100 99
Removal rate (%) when the liquid passing ratio was 3,000 times 65 76 100 80
Removal Rate (%) at a liquid passing multiple of 6,000 times 50 52 100 55
[ tables 2-2]
Example 5 Example 6 Comparative example 1 Comparative example 2
Raw material Bamboo Bamboo Coconut shell Coconut shell
Mesopore volume (cm)3/g) 0.084 0.1 0.03 0.05
Differential volume maximum with pore diameter of 0.4-0.6 nm 2.58 2.85 1.64 1.57
BET specific surface area (m)2/g) 1273 1247 1093 1173
Total pore volume (cm)3/g) 0.57 0.58 0.47 0.49
Micropore volume (cm)3/g) 0.5 0.5 0.44 0.46
Particle diameter of Primary particle (mm) 0.246 0.05 0.66 1.21
Packing Density (cm)3/g) 0.246 0.229 0.538 0.578
Removal Rate (%) at a liquid passing multiple of 1,000 times 100 100 64 50
Removal rate (%) when the liquid passing ratio was 3,000 times 97 100 45 41
Removal Rate (%) at a liquid passing multiple of 6,000 times 69 100 35 33
Industrial applicability
The porous carbon of the present invention has high adsorption performance, and therefore can be used for electrode materials for capacitors, various adsorbents, masks, adsorption sheets, catalyst supports, and the like.

Claims (9)

1. A porous carbon characterized in that,
mesopore volume of 0.07cm3Micro/g and pore diameter of 0.4-0.6 nmThe maximum value of the partial volume is more than 1.6,
the raw material of the porous carbon is a material from bamboo of Gramineae,
the particle size of the raw material is 5-500 μm,
the particle diameter of the primary particle of the porous carbon is 0.1mm or less,
the bamboo of the Gramineae family is Phyllostachys pubescens,
the differential volume maximum value of the pore diameter of 0.4 nm-0.6 nm is obtained by calculating the pore distribution by DFT method,
the particle size of the primary particles is a particle size corresponding to the central value of the distribution in a particle size distribution in which the horizontal axis represents the particle size and the vertical axis represents the number frequency.
2. Porous carbon according to claim 1,
the specific surface area of the porous carbon measured by the BET nitrogen adsorption method was 10m2More than g.
3. Porous carbon according to claim 1,
the total pore volume of the porous carbon is 0.5cm3More than g.
4. Porous carbon according to claim 1,
the porous carbon has a micropore volume of 0.5cm3More than g.
5. An organic halide removal device, which is characterized in that,
the device has a filter composed of the porous carbon of any one of claims 1 to 4.
6. The organohalide removal device of claim 5, wherein,
when the organic halide is removed from water containing the organic halide at a concentration of 0.06mg/L at a liquid passing ratio of 1,000 times, the removal rate of the organic halide is 90% or more.
7. The organohalide removal device of claim 5, wherein,
when the organic halide is removed from water containing the organic halide at a concentration of 0.06mg/L at a liquid passing ratio of 3,000 times, the removal rate of the organic halide is 65% or more.
8. The organohalide removal device of claim 5, wherein,
when the organic halide is removed from water containing the organic halide at a concentration of 0.06mg/L at a liquid passing ratio of 6,000 times, the removal rate of the organic halide is 50% or more.
9. The organohalide removal device of claim 6, wherein,
the organic halide is chloroform.
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JPH11217207A (en) * 1998-01-30 1999-08-10 Kurimoto Ltd Production of active carbon from unsaturated polyester resin waste material
TW200932348A (en) * 2008-01-24 2009-08-01 Forestry Bureau Council Of Agriculture Executive Yuan Heavy metal adsorbent and fabrication method thereof
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