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Method for preparing biomass absorbing agent capable of absorbing heavy metal ions in waste water efficiently

A technology of biomass adsorbent and heavy metal ions, which is applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high raw material cost, low adsorption capacity, secondary pollution, etc. The effect of low cost and large saturated adsorption capacity

Active Publication Date: 2015-11-04
INST OF BIOLOGICAL RESOURCES JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, such biomass adsorbents have problems such as low adsorption capacity, high cost of raw materials, and secondary pollution during the preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Rice stalks were taken from Leping City, Jiangxi Province, rinsed, dried at 65°C to constant weight, crushed, sieved, and 30-60 mesh straws were taken for testing.

[0015] Mix a certain amount of straw with a solution with a concentration of sulfuric acid of 0.1% (v / v) and a concentration of hydrogen peroxide of 2.5% (v / v). The amount of straw added is 20g / L, and the mixed solution is heated in a water bath at 60°C. Stir, fully react for 1 hour, filter, rinse repeatedly until neutral, and dry for 24 hours. Take a certain amount of reacted straw and mix it with 10g / L disodium hydrogen phosphate solution, the amount of straw added is 20g / L, put it on a constant temperature shaking shaker, react at 25°C for 2h, then filter the mixed solution, and wash it repeatedly with distilled water until medium Dry at 65°C for later use.

[0016] Mix the prepared modified adsorbent with the prepared solution containing cadmium or copper ions, and the Cd in the cadmium-containing solu...

Embodiment 2

[0018] The rice straw was taken from Leping City, Jiangxi Province, rinsed with water, dried at 65°C to constant weight, crushed, sieved, and 100-200 mesh straw was selected for the test.

[0019] Mix a certain amount of straw with a solution with a sulfuric acid concentration of 0.1% (v / v) and a hydrogen peroxide concentration of 1.5% (v / v). The amount of straw added is 20g / L. Heat and stir in a water bath at 60°C to fully react After 1h, filter, rinse repeatedly until neutral, and dry the sample. Take a certain amount of treated straw and put it in 0.5g / L phosphoric acid solution, the amount of straw added is 20g / L, then put it in a water bath, react at 60°C for 1 hour, filter it, rinse it repeatedly with distilled water until neutral, and dry it for later use .

[0020] Mix the prepared modified adsorbent with the prepared solution containing cadmium or copper ions, and the Cd in the cadmium-containing solution 2+ The concentration is 100mg / L, the pH value is 5.68, Cu in ...

Embodiment 3

[0022] The rice straw was taken from Leping City, Jiangxi Province, rinsed with water, dried to constant weight, pulverized by a vibrating pulverizer, and straws of 30 mesh to 60 mesh were selected for the test. Mix a certain amount of straw with a solution with a concentration of sulfuric acid of 0.1% (v / v) and a concentration of hydrogen peroxide of 2% (v / v). The amount of straw added is 20g / L, heated and stirred in a water bath at 60°C, and fully reacted for 1 hour. Filter, rinse repeatedly until neutral, and dry. Take a certain amount of oxidized straw and mix it with 15g / L disodium hydrogen phosphate solution, the amount of straw added is 20g / L, put it in a water bath and react at 40°C for 2h, filter, rinse repeatedly with distilled water until neutral, and dry spare.

[0023] Take the wastewater from the acidic reservoir effusion pool of a copper mine, the wastewater contains Cu 2+ 18.962mg / L, basically free of Cd 2+ , the pH value is 3.10, the prepared adsorbent is a...

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Abstract

The invention relates to a method for preparing a biomass absorbing agent capable of absorbing heavy metal ions in waste water efficiently and belongs to the fields of material preparation and waste water treatment. The method is characterized by comprising the steps of treating rice straw which is low in price and easy to obtain as raw materials, and conducting washing, drying, pulverization and screening. Firstly, the pretreatment is conducted through an acidic hydrogen peroxide solution, the method of conducting the heating and stirring in water bath is adopted for reaction, and the rice straw is filtered, washed to be neutral and dried. Then phosphoric acid or disodium hydrogen phosphate serves as the modifying agent, the straw which is obtained after the pretreatment is heated and stirred for reaction, after the reaction is ended, the straw is filtered, washed to be neutral and dried, and the needed heavy metal ion absorbing agent is obtained. The method has the advantages of being simple in preparation method, low in cost, free of secondary pollution and the like.

Description

Technical field: [0001] The invention relates to a preparation method of a biomass adsorbent for efficiently adsorbing heavy metal ions in waste water, which is used for treating low-concentration heavy metal waste water and belongs to the fields of material preparation and waste water treatment. Background technique: [0002] Heavy metal pollution in water has become an increasingly serious environmental pollution problem. In April 2015, the state issued an action plan for water pollution prevention and control, requiring strict attention to water pollution prevention and control. Currently, heavy metal wastewater treatment methods mainly include chemical precipitation, physical methods, adsorption and ion exchange. The chemical precipitation method and the physical method have problems such as high processing cost and unstable effect. Adsorption and ion exchange have large adsorption capacity and fast adsorption speed, but the cost is high and regeneration is difficult. ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 李晓晖艾仙斌胡淼丁建南
Owner INST OF BIOLOGICAL RESOURCES JIANGXI ACAD OF SCI
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