CN104525159A - Preparation method of heavy metal ion adsorbent - Google Patents
Preparation method of heavy metal ion adsorbent Download PDFInfo
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- CN104525159A CN104525159A CN201510015581.0A CN201510015581A CN104525159A CN 104525159 A CN104525159 A CN 104525159A CN 201510015581 A CN201510015581 A CN 201510015581A CN 104525159 A CN104525159 A CN 104525159A
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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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/223—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
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- 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
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Abstract
The invention discloses a preparation method of a heavy metal ion adsorbent. The preparation method comprises the following steps of firstly preparing capped nano zero-valent iron, then modifying oxidized graphene, throwing the modified oxidized graphene into water, preparing oxidized graphene suspension liquid through ultrasonic dispersion for 1-3 hours, adding prepared capped nano zero-valent iron to be fully stirred, and then performing suction filtration, washing and drying to obtain the capped nano zero-valent iron using the modified oxidized graphene as a carrier. The capped nano zero-valent iron is prepared by using tea polyphenol, agar and water-soluble starch which are low in price and harmless as a surface modifier, and the removal rate of a target pollutant is improved. The preparation method adopts covalent bond to modify the surface of the oxidized graphene. The heavy metal ion absorption capacity of the modified oxidized graphene is remarkably improved by one to two times.
Description
Technical field
The present invention relates to field of nanometer material technology, particularly a kind of preparation method of heavy metal absorbent.
Background technology
Nano zero valence iron because of its reducing power strong, cheaper starting materials is easy to get, in use not easily cause secondary pollution, and have and efficient remove pollutant in bed mud or water body as the advantage containing halogenated organic matters, nitroaromatic and heavy metal ion etc., have larger application prospect in field of waste water treatment.
A kind of method based on liquid complexing reduction method for preparing nanometer Zero-valent Iron is disclosed in Chinese invention patent application prospectus 201110211774.5, soluble ferrite and complexing agent sulfosalicylic acid are dissolved in water, the pH value regulating solution is 5 ~ 7, forms complexing ferrous iron solution; Add oxolane in complexing ferrous iron solution, mix; NaBH4 or KBH4 solution is added in described complexing ferrous iron solution, under stirring, carries out Liquid reduction reaction process, the obtained nano zero valence iron particle of complex state ferrous ion reduction.The inventive method synthesis of nano iron particle, particle size range is 5 ~ 20nm about, and average grain diameter is 10 ~ 18nm about, specific area 70 ~ 90m2/g.
Existing nano zero valence iron still has more restriction in actual applications, is mainly reflected in: the activity of nano zero valence iron is high, its can and water in oxygen and water react, thus reduce the clearance of target contaminant; Nano zero valence iron is active in acid condition to be improved, but acid condition understands etching apparatus in actual applications; Nano zero valence iron is difficult to reclaim in aqueous, and nano zero valence iron particle is easily reunited in the solution, thus greatly reduces its reactivity and utilization ratio.In addition, although graphene oxide composite material surface has hydroxyl, carbonyl and carboxyl isoreactivity group, can have an effect with metal ion, it is selective not fully up to expectations.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of preparation method of heavy metal absorbent, the method comprises the steps:
(1) ferrous sulfate and the corresponding sodium borohydride that take constant weight grind 10min in mortar, obtain solid-phase media, for subsequent use;
(2) prepare certain density Tea Polyphenols, agar, water soluble starch mixed aqueous solution as liquid phase medium, for subsequent use;
(3) be 10 ~ 25:1 according to the mass ratio of liquid phase medium and solid-phase media, liquid phase medium added in solid-phase media, stir and be deployed into the covert body of stream; At 20-25 DEG C of reaction 2h, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven;
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C,
(5) modification rear oxidation Graphene step (4) obtained is thrown and is added to the water, graphene oxide suspension is obtained after ultrasonic disperse 1-3 hour, then the coated nano zero valence iron that step (3) is obtained is added, suction filtration, washing and drying is carried out after abundant stirring, obtain modifying the coated nano zero valence iron that rear oxidation Graphene is carrier, i.e. heavy metal absorbent.
Described in step (1), the mass ratio of ferrous sulfate and sodium borohydride is 1:3 ~ 5.
Described in step (2), the mass ratio of Tea Polyphenols, agar and water soluble starch is 10 ~ 12:1:3 ~ 8.
Coated nano zero valence iron described in step (3) has monodispersed spherical or ellipse spherical morphology, and average grain diameter is 100 ~ 150nm.
The concentration of the graphene oxide suspension described in step (5) is 8mg/mL ~ 12 mg/mL.
The mass ratio of the graphene oxide described in step (5) and coated nano zero valence iron is 1:2 ~ 5.
The present invention also provides a kind of method to modify heavy metal in coated nano zero valence iron adsorption treatment water that rear oxidation Graphene is carrier using above-mentioned preparation method to obtain, specific as follows:
Every aqueous solution adds 1g ~ 2g to modify the coated nano zero valence iron that rear oxidation Graphene is carrier, the temperature controlling the aqueous solution is 20 DEG C ~ 30 DEG C, abundant absorption vibration are to after reacting completely, utilize filter membrane to absorption after more than liquid filter, complete the removal to heavy metal ion in the aqueous solution.
The invention has the advantages that:
(1) the present invention with harmless Tea Polyphenols, agar and the water soluble starch of cheapness for coating material prepares coated nano zero valence iron, not only increase water-soluble, and prevent the oxygen in nano zero valence iron and water and water to react, thus improve the clearance of target contaminant.。
(2) the coated nano zero valence iron of what prepared by the present invention with graphene oxide is carrier, graphene oxide and coated nano zero valence iron are linked together by the effect of chemical bond, and nano zero valence iron can not cause secondary pollution from landing graphene oxide.
(3) although graphene oxide composite material surface has hydroxyl, carbonyl and carboxyl isoreactivity group, can have an effect with metal ion, it is selective not fully up to expectations.The present invention uses covalent bond to modify surface of graphene oxide.So-called covalent bond is modified, and is that some chemical groups or reagent are attached to graphenic surface by covalent bond, and modify relative to non-covalent bond, this method stability is better.The group of selected chemical reagent should contain N, O and S atom, can make metal ion and its coordination like this, by coordination separation and concentration metal ion, can significantly improve the selective of absorption and sensitivity.Through measuring, the adsorption capacity of the graphene oxide heavy metal after modification strengthens greatly, as to Cr
6+maximal absorptive capacity be respectively 390 mg/g, be much higher than the adsorbance of nano zero valence iron 148 mg/g, ordinary oxygen functionalized graphene nano zero valence iron 162 mg/g, adsorption capacity significantly improves 1-2 doubly.
(4) do not produce accessory substance environment being had to pollution in preparation process of the present invention, and raw material is simple and easy to get, preparation cost is lower.Preparation technology is simple, and condition is easily controlled, and is suitable for continuously large-scale batch production.
Detailed description of the invention
For enabling above-mentioned purpose, the feature and advantage of invention more become apparent, below the specific embodiment of the present invention is described in detail.
Embodiment 1:
(1) take a 1g ferrous sulfate and 3g sodium borohydride grinds 10min in mortar, obtain solid-phase media;
(2) get 10g Tea Polyphenols, 1g agar, 3g water soluble starch, be dissolved in 30ml water, as liquid phase medium;
(3) liquid phase medium is added in solid-phase media, stir and be deployed into the covert body of stream; 2h is reacted at 20 DEG C, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven.
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C.
(5) graphene oxide after being modified by 5g is dispersed in water, by graphene oxide suspension obtained after ultrasonic disperse, concentration is adjusted to 8mg/L, then the coated nano zero valence iron that 10g step (3) is obtained is added, carry out suction filtration, washing and drying after abundant stirring, obtain modifying the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier.
Every aqueous solution adds 1g to modify the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier; In adsorption process, controlling the temperature of the aqueous solution is 20 DEG C, fully adsorb and vibrates to after reacting completely, and utilizes filter membrane to filter, to Cu in the aqueous solution liquid more than after adsorbing
2+adsorption rate be 84%.
Embodiment 2:
(1) take a 1g ferrous sulfate and 4g sodium borohydride grinds 10min in mortar, obtain solid-phase media;
(2) get 10g Tea Polyphenols, 1g agar, 3g water soluble starch, be dissolved in 30ml water, as liquid phase medium;
(3) liquid phase medium is added in solid-phase media, stir and be deployed into the covert body of stream; 2h is reacted at 20 DEG C, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven.
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C.
(5) graphene oxide after being modified by 5g is dispersed in water, by graphene oxide suspension obtained after ultrasonic disperse, concentration is adjusted to 8mg/L, then the coated nano zero valence iron that 10g step (3) is obtained is added, carry out suction filtration, washing and drying after abundant stirring, obtain modifying the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier.
Every aqueous solution adds 1g to modify the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier; In adsorption process, controlling the temperature of the aqueous solution is 20 DEG C, fully adsorb and vibrates to after reacting completely, and utilizes filter membrane to filter, to Cd in the aqueous solution liquid more than after adsorbing
2+adsorption rate be 88%.
Embodiment 3:
(1) take a 1g ferrous sulfate and 3g sodium borohydride grinds 10min in mortar, obtain solid-phase media;
(2) get 10g Tea Polyphenols, 1g agar, 3g water soluble starch, be dissolved in 30ml water, as liquid phase medium;
(3) liquid phase medium is added in solid-phase media, stir and be deployed into the covert body of stream; 2h is reacted at 20 DEG C, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven.
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C.
(5) graphene oxide after being modified by 5g is dispersed in water, by graphene oxide suspension obtained after ultrasonic disperse, concentration is adjusted to 8mg/L, then the coated nano zero valence iron that 10g step (3) is obtained is added, carry out suction filtration, washing and drying after abundant stirring, obtain modifying the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier.
Every aqueous solution adds 2g to modify the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier; In adsorption process, controlling the temperature of the aqueous solution is 25 DEG C, fully adsorb and vibrates to after reacting completely, and utilizes filter membrane to filter, to Pb in the aqueous solution liquid more than after adsorbing
2+adsorption rate be 92%.
Embodiment 4:
(1) take a 1g ferrous sulfate and 5g sodium borohydride grinds 10min in mortar, obtain solid-phase media;
(2) get 10g Tea Polyphenols, 1g agar, 3g water soluble starch, be dissolved in 30ml water, as liquid phase medium;
(3) liquid phase medium is added in solid-phase media, stir and be deployed into the covert body of stream; 2h is reacted at 20 DEG C, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven.
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C.
(5) graphene oxide after being modified by 5g is dispersed in water, by graphene oxide suspension obtained after ultrasonic disperse, concentration is adjusted to 8mg/L, then the coated nano zero valence iron that 10g step (3) is obtained is added, carry out suction filtration, washing and drying after abundant stirring, obtain modifying the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier.
Every aqueous solution adds 1g to modify the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier; In adsorption process, controlling the temperature of the aqueous solution is 30 DEG C, fully adsorb and vibrates to after reacting completely, and utilizes filter membrane to filter, to Cr in the aqueous solution liquid more than after adsorbing
6+adsorption rate be 90%.
Embodiment 5:
(1) take a 1g ferrous sulfate and 5g sodium borohydride grinds 10min in mortar, obtain solid-phase media;
(2) get 10g Tea Polyphenols, 1g agar, 3g water soluble starch, be dissolved in 30ml water, as liquid phase medium;
(3) liquid phase medium is added in solid-phase media, stir and be deployed into the covert body of stream; 2h is reacted at 20 DEG C, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven.
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C.
(5) graphene oxide after being modified by 5g is dispersed in water, by graphene oxide suspension obtained after ultrasonic disperse, concentration is adjusted to 8mg/L, then the coated nano zero valence iron that 10g step (3) is obtained is added, carry out suction filtration, washing and drying after abundant stirring, obtain modifying the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier.
Every aqueous solution adds 2g to modify the coated nano zero-valence iron adsorbent that rear oxidation Graphene is carrier; In adsorption process, controlling the temperature of the aqueous solution is 30 DEG C, fully adsorb and vibrates to after reacting completely, and utilizes filter membrane to filter, to Zn in the aqueous solution liquid more than after adsorbing
2+adsorption rate be 94%.
Claims (7)
1. a preparation method for heavy metal absorbent, is characterized in that the method comprises the steps:
(1) ferrous sulfate and the corresponding sodium borohydride that take constant weight grind 10min in mortar, obtain solid-phase media, for subsequent use;
(2) prepare certain density Tea Polyphenols, agar, water soluble starch mixed aqueous solution as liquid phase medium, for subsequent use;
(3) be 10 ~ 25:1 according to the mass ratio of liquid phase medium and solid-phase media, liquid phase medium added in solid-phase media, stir and be deployed into the covert body of stream; At 20-25 DEG C of reaction 2h, by absolute ethanol washing product three times, obtained coated nano zero valence iron, dry for standby in vacuum drying oven;
(4) graphene oxide is dissolved in ethanol the mixed liquor forming 2-4mg/L, get above-mentioned mixed liquor 100 mass parts, add 2 of 10 mass parts wherein, 4-dichlorobenzoperoxide, stir after 5-10 minute, add the benzophenone of 10 mass parts, stir after 5-10 minute, add the 6-ethyoxyl-2 of 5 mass parts, 2, 4-trimethyl-1, 2-dihyaroquinoline, stir after 5-10 minute, add the vinyltrimethoxy silane of 10 mass parts, stir after 5-10 minute, add the 1-METHYLPYRROLIDONE of 5 mass parts, stir after 5-10 minute, add the ethoxylated neopentylglycol diacrylate of 10 mass parts, stir after 5-10 minute, add the melmac of 10 mass parts, stir after 5-10 minute, add the acrylic acid-2-ethyl caproite of 5 mass parts, stir 5-10 minute, leave standstill and filter out solid matter after 1-2 hour, 4 times are rinsed with ethanol and deionized water interval, dry under 25-35 DEG C of condition, obtain modifying rear oxidation Graphene, for subsequent use, the above-mentioned process that is uniformly mixed all is carried out at 30-40 DEG C,
(5) modification rear oxidation Graphene step (4) obtained is thrown and is added to the water, graphene oxide suspension is obtained after ultrasonic disperse 1-3 hour, then the coated nano zero valence iron that step (3) is obtained is added, suction filtration, washing and drying is carried out after abundant stirring, obtain modifying the coated nano zero valence iron that rear oxidation Graphene is carrier, i.e. heavy metal absorbent.
2. preparation method according to claim 1, is characterized in that, described in step (1), the mass ratio of ferrous sulfate and sodium borohydride is 1:3 ~ 5.
3. preparation method according to claim 1, is characterized in that, described in step (2), the mass ratio of Tea Polyphenols, agar and water soluble starch is 10 ~ 12:1:3 ~ 8.
4. preparation method according to claim 1, is characterized in that, coated nano zero valence iron described in step (3) has monodispersed spherical or ellipse spherical morphology, and average grain diameter is about 100 ~ 150nm.
5. preparation method according to claim 1, is characterized in that, the concentration of the graphene oxide suspension described in step (5) is 8mg/mL ~ 12 mg/mL.
6. preparation method according to claim 1, is characterized in that, the mass ratio of the graphene oxide described in step (5) and coated nano zero valence iron is 1:2 ~ 5.
7. the method for heavy metal ion in the heavy metal absorbent process water using preparation method described in claim 1-6 to obtain, it is characterized in that, every aqueous solution adds 1g ~ 2g to modify the coated nano zero valence iron that rear oxidation Graphene is carrier, the temperature controlling the aqueous solution is 20 DEG C ~ 30 DEG C, abundant absorption vibration are to after reacting completely, utilize filter membrane to absorption after more than liquid filter, complete the removal to heavy metal ion in the aqueous solution.
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| CN108620035B (en) * | 2018-05-24 | 2020-09-18 | 中国工程物理研究院材料研究所 | Nuclide uranium removal adsorbent and application method thereof |
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