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Organic inorganic composite hydrogel capable of removing heavy metal from water body

An inorganic composite, hydrogel technology, applied in the directions of alkali metal compounds, inorganic chemistry, water/sewage treatment, etc., can solve the problems of low selectivity, low regeneration efficiency, high price of activated carbon, etc., and achieve strong heavy metal ion adsorption performance. Effect

Inactive Publication Date: 2017-06-27
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated carbon molecular sieve adsorbents mainly use physical adsorption, which has low selectivity, and high-quality activated carbon is expensive and has low regeneration efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Purification of clay: mechanically pulverize and sieve the attapulgite, take a 20-mesh mineral sample and add distilled water to make slurry, use wet natural sedimentation and high-speed centrifugation for purification, and use the freezing-thawing method for lamella Dissociation;

[0022] b. Clay activation: mechanically pulverize and sieve the attapulgite treated in step a, take a 20-mesh ore sample, add 25% hydrochloric acid for activation, place it overnight at room temperature, and filter it with a Buchner funnel , washed with water until neutral, baked in an oven at 105°C for 1 hour, and then roasted in a tube furnace at 400°C for 2 hours before use;

[0023] c, mechanically pulverize and sieve the processed clay in step b, and get the ore sample with a particle size of 200 mesh for subsequent use;

[0024] d. Preparation of adsorbent: Take 3.00g of acrylic acid in a 250mL beaker, add 45mL of deionized water, then add 0.10g of methylenebisacrylamide, heat the ...

Embodiment 2

[0033] a. Purification of clay: mechanically pulverize and sieve the attapulgite, take the ore sample with a particle size of 80 mesh and add distilled water to make slurry, use wet natural sedimentation and high-speed centrifugation for purification, and use the freezing-thawing method for lamella Dissociation;

[0034] b. Clay activation: mechanically pulverize and sieve the attapulgite processed in step a, take a mineral sample with a particle size of 80 mesh, add hydrochloric acid with a concentration of 1% for activation, place it overnight at room temperature, and filter it with a Buchner funnel , washed with water until neutral, baked in an oven at a temperature of 105°C for 1.5h, and then roasted in a tube furnace at a temperature of 400°C for 2h before use;

[0035] c, mechanically pulverize and sieve the processed clay in step b, and get the ore sample with a particle size of 200 mesh for subsequent use;

[0036] d. Preparation of adsorbent: Take 4.00g of acrylamide...

Embodiment 3

[0045] a. Clay purification: mechanically pulverize and sieve bentonite, take ore samples with a particle size of 40 mesh and add distilled water to make slurry, use wet natural sedimentation and high-speed centrifugation for purification, and use the freezing-thawing method for lamellar lysis Leave;

[0046] B, clay activation: mechanically pulverize and sieve the treated bentonite in step a, take a particle size of 40 mesh ore samples, add a concentration of 20% hydrochloric acid to activate, place overnight at room temperature, and suction filter with a Buchner funnel. Wash with water until neutral, bake in an oven at 105°C for 1 hour, and then roast in a tube furnace at 400°C for 2 hours before use;

[0047] c, mechanically pulverize and sieve the processed clay in step b, and get the ore sample with a particle size of 200 mesh for subsequent use;

[0048] d. Preparation of adsorbent: Take 3.20g of methacrylic acid in a 250mL beaker, add 45mL of deionized water, then add ...

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Abstract

The invention relates to organic inorganic composite hydrogel capable of removing a heavy metal from water body. The composite hydrogel consists of sodium alginate, ammonium alginate or alginic acid, acrylamide, acrylic acid or methacrylic acid, attapulgite, bentonite or kaolin clay, and is prepared according to a cross-linking polymerization method, wherein the crosslinking agent adopts methylene bisacrylamide, and the initiator adopts ammonium persulfate, potassium peroxodisulfate or azodiisobutyronitrile. The whole preparation process is conducted in an aqueous solution, and the preparation method is simple, does not need special process equipment, and is low in energy consumption, low in production cost, environmentally friendly and easy in industrialization. The desorption process of the hydrogel is simple, low in energy consumption, low in production cost, environmentally friendly and easy in industrialization, and has high adsorption quantity on divalent lead ions, divalent cadmium ions and divalent copper ions and little influence of acidity and alkalinity. An adsorbent which adsorbs heavy metal ions can absorb heavy metal ions again after the heavy metal ions are removed from the adsorbent by taking hydrochloric acid as a desorbent, so that high renewability and cyclicity are achieved.

Description

technical field [0001] The invention belongs to the technical field of treatment of heavy metals in water, and relates to an organic-inorganic composite hydrogel for removing heavy metals in water. Background technique [0002] China is a country with a shortage of water resources. In addition, the distribution of water resources is uneven, and the distribution of water resources does not match the distribution of population and cultivated land. Water resources have long been an important bottleneck restricting the sustainable development of China's society and economy. Water pollution has exacerbated the serious situation of water shortage, and heavy metal pollution is the most serious in water pollution. Heavy metals are different from other pollutants. Heavy metals in the environment cannot be degraded. They mainly enter animals and plants through air, water, soil, etc., and enter the human body through food chain amplification and enrichment. Heavy metals in the human bo...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/28047B01J20/12B01J20/22B01J20/24C02F1/28C02F1/285C02F1/286C02F2101/20
Inventor 王传义毛辛有朱云庆
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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