CN202366572U - Nano-iron oxide modified quartz sand filter material - Google Patents
Nano-iron oxide modified quartz sand filter material Download PDFInfo
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- CN202366572U CN202366572U CN2011202446998U CN201120244699U CN202366572U CN 202366572 U CN202366572 U CN 202366572U CN 2011202446998 U CN2011202446998 U CN 2011202446998U CN 201120244699 U CN201120244699 U CN 201120244699U CN 202366572 U CN202366572 U CN 202366572U
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- quartz sand
- iron oxide
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Abstract
The utility model discloses a nano-iron oxide modified quartz sand filter material, which comprises a quartz sand carrier and a nano-iron oxide absorption layer coated on the quartz sand carrier, wherein the particle size of the quartz sand carrier is between 500 mu m and 1200 mu m, the nano-iron oxide absorption layer is mainly composed of FeO3 particles, the thickness of the nano-iron oxide absorption layer is between 25 mu m and 65 mu m, and the pore diameter of the surface pore of the filter material is between 0.2 mu m and 1.0 mu m. According to a Brunauer-Emmett-Teller (BET) specific surface area measurement, the specific surface area of the nano-iron oxide modified quartz sand filter material is increased by 10 times compared with that of a ordinary iron oxide modified quartz sand filter material and increased by 100 times compared with that of an unmodified quartz sand, so that the absorption capacity of the filter material is greatly improved, the size of the surface pore reaches nanometer grade, and the filer material can effectively absorb nanometer grade pollutant particles and is simple in preparation process and low in production cost.
Description
Technical field
The utility model relates to modification quartz sand filter material, is specifically related to a kind of nano-sized iron oxide modification quartz sand filter material.
Background technology
Along with organic matter in the progress of detection means and the water detects the increase of kind, drinking water standard has been made more and more strict restriction to organic kind and content.New water standard has increased by 71 indexs altogether, and organic compound index increase ratio accounts for 70%.And little pollution organic indicator, especially low-molecular-weight dissolved organic matter, nanoscale pollutant are one of difficult point problems of water treatment field.The key that addresses the above problem is the filter material in the intensive filtration technology.The factor that influences filter material Filtration Adsorption effect mainly contains, the size of quartz sand carrier grain radius; The composition of adsorption layer, the size in adsorbent layer thickness, aperture, surface pore etc.How to design and prepare a kind of adaptation micropollutants and remove, and preparation technology is simple, the filter material that production cost is low is the key issue that present industry needs to be resolved hurrily.
The various novel filtrate of development all is to carry out towards improving the filter material surface characteristic both at home and abroad at present, is about to traditional filtrate and carries out the retaining power that modification improves filter material surface.Wherein, Adhere to the modified filter material of layer of active oxidant through chemical reaction as modifier; Can effectively improve the adsorption capacity of filtrate to some particular matter; And strengthen the retaining power in filter tank, thus effectively remove the multiple poisonous and hazardous micro polluting substance such as heavy metal ion, organic matter, bacterium and virus, algae etc. in the water, improve water quality.Experiment showed, that in many modified filter materials iron oxide modification quartz sand filter material is the highest to organic clearance, adsorption time is the shortest.EPA has proposed iron oxide modification quartz sand filter material is used for water facilities as an emerging arsenic removal filtering technique.
The principle of modified filter material is theoretical according to physical chemistry, and the solid that specific area is bigger usually is unsettled, when condition permit, always will adsorb some tiny particles, becomes smoothly and non-activity reaches stable with the surface.When modifier sticked on the filtrate, countless minitype particles were deposited in filter material surface, caused the specific area more much bigger than former filtrate, and were cellular, and this bigger serface will form its good adsorption performance.Simultaneously the pH value during filtrate isoelectric point (PZC) has been brought up to about 7.5～10.3 owing to original 0.7～2.2; Make modified filter material positively charged under the environment of neutral water; Because the particle surface in most of water all has negative electrical charge, this extremely helps removing the organic matter in the micro-polluted water again.Modified filter material only need be changed filtrate, need not add any medicament, can reach the dual purpose of removing organic matter and suspended particulate in the water, and this way relatively is fit to China at present to the present situation of water treatment.Table 1 is the performance comparison situation of ordinary filter and modified filter material.
Now, the preparation method of iron oxide modification quartz sand filter material mainly contains repeated precipitation process and heating vaporization.Wherein repeated precipitation process is to generate precipitate metal hydroxides through slaine and alkali reaction, becomes metal oxide then; And the heating evaporation rule is to make the slaine hydrolysis produce precipitation of hydroxide through heating, and then is transformed into metal oxide attached on the filter material surface.Available research achievements shows: repeated precipitation process is controlled easily, be easy to realize, and adsorption capacity is big, but the cover layer of gained comes off easily; The filtrate adhesive strength that heating vaporization is prepared than repeated precipitation process is high, and the material that its surface forms more helps the performance of electrostatic adsorption, but the adsorption capacity of gained filter material is still undesirable.The bottleneck problem that above-mentioned technology mainly exists following urgent need to solve: comprise that adsorption capacity is not enough, the backwash desorption is difficult, adhesive strength is strong, load capacity is lower, surface apertures, absorption pollutant kind are single etc., thereby influenced the practical application and the popularization of iron oxide modification quartz sand filter material.
Summary of the invention
The purpose of the utility model provides a kind of nano-sized iron oxide modification quartz sand filter material, is used to adsorb the nanoscale pollutant, is specially adapted to the purified treatment of drinking water.
The nano-sized iron oxide modification quartz sand filter material of the utility model comprises the quartz sand carrier and is wrapped in the nano-sized iron oxide adsorption layer on the said carrier that described filter material is that knurl is spherical, and quartz sand carrier grain radii size is 500～1200 μ m; Said nano-sized iron oxide absorption bed thickness is 25～65 μ m, and the size in surface of filter medium hole aperture is 0.2～1.0 μ m.Said nano-sized iron oxide adsorption layer is mainly by FeO
3Particle is formed.
Said FeO
3The grain diameter size is 0.1～0.8 μ m.
The spherical surface that is meant of the described knurl of this specification is covered with the irregular particle body, the orbicule of surface irregularity.
The ferric oxide particles size is little to nanoscale (1～100nm) time; Its surface atom number, specific area and surface ability etc. all sharply increase along with reducing of particle diameter; Thereby characteristics such as the small-size effect of showing, quantum size effect, skin effect and macro quanta tunnel effect; Have good optical character, magnetic, catalytic performance etc., have at aspects such as light absorption, medicine, magnetizing mediums and catalysis widely and use
[45]
The research of all relevant IOCS of scholar both at home and abroad at present all is to adopt common FeCl
3, Fe (NO
3)
3Prepare Deng modifier, and adopt FeO
3Nano modification quartz sand also is not seen in report both at home and abroad.Nanometer Fe O
3As nano material, have the not available many special fundamental propertys of conventional solid, like skin effect, small-size effect, quantum size effect, macroscopical tunnel-effect and boundary's electricity confinement effect etc.With regard to absorption property, nanometer Fe O
3Owing to have big specific area and surface atom coordination not enough, compare with the massive material of identical material, non-electrolyte, electrolyte all there are very strong characterization of adsorption.Nanometer Fe O
3The surface is positively charged, but also is magnetic, and can adsorb the electronegative organic pollution and the heavy metal of magnetic.
Show through BET specific area measuring result; The more common iron oxide modification quartz sand specific area of the specific area of nano-sized iron oxide modification quartz sand improves 10 times; More unmodified quartz sand specific area improves more than 100 times; Greatly improved the adsorption capacity of filtrate, the surface pore size reaches nanoscale, and is more effective for the nano level contamination particle of absorption.And preparation technology's method is simple, low production cost.
Description of drawings
Fig. 1 is the structural representation of the utility model.
The specific embodiment
Of Fig. 1, the utility model comprises quartz sand carrier 1 and is wrapped in the nano-sized iron oxide adsorption layer 2 on the said carrier, and described filter material is that knurl is spherical, and 1 radii size of quartz sand carrier is 500～1200 μ m; Said nano-sized iron oxide adsorption layer 2 is thick to be 25～65 μ m, and the size in surface of filter medium hole 4 apertures is 0.2～1.0 μ m.Said nano-sized iron oxide adsorption layer is mainly by FeO
3Particle 3 is formed.Said FeO
3Particle 3 size are 0.1～0.8 μ m.
One, the preparation method of the utility model.
(1) sieve is got unmodified quartz sand.
1, the screen cloth that is respectively 0.5 mm and 1.2mm with the aperture screens natural undressed quartz sand, and what obtain diameter range and be 0.5～1.2mm treats the surface preparation quartz sand filter media.
2, rinse well repeatedly with running water, remove its surface contaminant and other impurity, oven dry.
3, use
0.1mol/LHCl solution acidleach 24h.
4, clean with distilled water flushing again, to pH value neutrality, stop flushing, dry for standby.
(2) modifier: adopt nanometer Fe
2O
3Alcohol or ketone dispersion liquid.
(3) surface modification treatment.
1, with above-mentioned subsequent use unmodified quartz sand and nanometer Fe
2O
3The alcohol dispersion liquid mixes.Wherein, the ratio of modifier dosage and RQS quality is C
2=0.1mL/g.Water-bath heating, drying in 100 ℃ of water-baths of constant temperature.
2, the amalgam after will drying is under 2504～50 ℃ temperature, calcining 2～4h.
3, be cooled to room temperature after taking out, remove the not nano-sized iron oxide particle in the load of quartz sand surface after the modification with distilled water flushing, be neutral until eluate, oven dry obtains nano-sized iron oxide modification quartz sand filter material.
Choose an amount of sample, amplify 5000 times through SEM (SEM) sample surfaces is observed, its structure is as shown in Figure 1, comprises quartz sand carrier 1 and is wrapped in the nano-sized iron oxide adsorption layer 2 on the said carrier.1 radii size of quartz sand carrier is 500～1200 μ m.Nano-sized iron oxide adsorption layer 2 is thick to be 25～65 μ m, mainly by FeO
3Particle 3 is formed FeO
3Particle 3 size are 0.1～0.8 μ m.The size in surface of filter medium hole 4 apertures is 0.2～1 μ m.
Two, the preparation method of the common modification quartz sand of reference examples.
(1), preparation modifier: concentration is the FeCl of 2mol/L
3The aqueous solution.
Taking by weighing molecular weight M is 270.29, and purity is analytically pure FeCl
36H
2O 108.116g places the beaker of 100ml, pours the distilled water about 50ml into, and on the electric furnace of 1500w heating for dissolving 5 minutes, be cooled to room temperature, with the volumetric flask of glass drainage, dissolve to 200ml with the distilled water dilution is fixed again to 200ml, obtain modifier.
(2), surface modification treatment.
1, takes by weighing above-mentioned unmodified quartz sand 50g, in the 250ml beaker, it is mixed with modifier.Wherein, the ratio of modifier dosage and unmodified quartz sand quality: C
1=0.25 mL/g.Fully stir to be placed in 110 ℃ of baking ovens and dry 24h, mixed liquor is not carried out any stirring in the drying course.
2, the amalgam after will drying is transferred in the resistance furnace, at calcining heat T=250 ℃, and high-temperature calcination under the condition of calcination time t=3h.
3, be cooled to room temperature after taking out, remove the not ferric oxide particles in the load of quartz sand surface after the modification, be neutral, put again in 110 ℃ of baking ovens and dry, obtain common iron oxide modification quartz sand filter material until eluate with distilled water flushing.
Get the nano-sized iron oxide modification quartz sand filter material of the utility model, unmodified quartz sand, common iron oxide modification quartz sand filter material and measure with golden dust spectrum BET specific area tester (F-Sorb 2400), the result is as shown in the table:
Can find out from last table; The more common iron oxide modification quartz sand specific area of the specific area of the utility model ratio nano iron oxide modification quartz sand improves 10 times; More unmodified quartz sand specific area improves more than 100 times; Greatly improve the adsorption capacity of filtrate, had good adsorption capacity.
Claims (3)
1. a nano-sized iron oxide modification quartz sand filter material comprises the quartz sand carrier and is wrapped in the nano-sized iron oxide adsorption layer on the said carrier, and it is characterized in that: described filter material is that knurl is spherical, and the particle radius size of said quartz sand carrier is 500～1200 μ m; Said nano-sized iron oxide absorption bed thickness is 25～65 μ m, and the size in surface of filter medium hole aperture is 0.2～1.0 μ m.
2. filter material as claimed in claim 1 is characterized in that: said nano-sized iron oxide adsorption layer is mainly by FeO
3Particle is formed.
3. filter material as claimed in claim 2 is characterized in that: said FeO
3The grain diameter size is 0.1～0.8 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202446998U CN202366572U (en) | 2011-07-12 | 2011-07-12 | Nano-iron oxide modified quartz sand filter material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202446998U CN202366572U (en) | 2011-07-12 | 2011-07-12 | Nano-iron oxide modified quartz sand filter material |
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| CN202366572U true CN202366572U (en) | 2012-08-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357323A (en) * | 2011-07-12 | 2012-02-22 | 广东工业大学 | Nanometer iron oxide-modified quartz sand filter material and preparation method thereof |
| CN104623973A (en) * | 2014-12-13 | 2015-05-20 | 济南大学 | Modified quartz sand andmodification method thereof |
-
2011
- 2011-07-12 CN CN2011202446998U patent/CN202366572U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357323A (en) * | 2011-07-12 | 2012-02-22 | 广东工业大学 | Nanometer iron oxide-modified quartz sand filter material and preparation method thereof |
| CN102357323B (en) * | 2011-07-12 | 2014-06-18 | 广东工业大学 | Nanometer iron oxide-modified quartz sand filter material and preparation method thereof |
| CN104623973A (en) * | 2014-12-13 | 2015-05-20 | 济南大学 | Modified quartz sand andmodification method thereof |
| CN104623973B (en) * | 2014-12-13 | 2016-06-29 | 济南大学 | A kind of Modified Quartz Sand and method of modifying thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: FOSHAN CITY WATER GROUP CO., LTD. Free format text: FORMER OWNER: GUANGDONG UNIVERSITY OF TECHNOLOGY Effective date: 20120806 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510006 GUANGZHOU, GUANGDONG PROVINCE TO: 528000 FOSHAN, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120806 Address after: 528000 water supply building, No. 16 Tongji West Road, Chancheng District, Guangdong, Foshan Patentee after: Foshan Water Group Co., Ltd. Address before: 510006 Panyu District, Guangzhou, Guangzhou University,, West Ring Road, No. 100 Patentee before: Guangdong University of Technology |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |