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,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1:

[0014] The rice stalks were taken from Leping City, Jiangxi Province, washed and dried at 65°C to a constant weight, crushed, sieved, and tested with 30-60 mesh stalks.

[0015] 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 2.5% (v / v). The amount of straw added is 20g / L, and the mixed solution is heated in a 60℃ water bath Stir, fully react for 1 hour, filter, rinse repeatedly until neutral, and dry for 24 hours. Take a certain amount of straw and mix it with 10g / L disodium hydrogen phosphate solution, add 20g / L of straw, put it on a constant temperature shaking shaker, react at 25℃ for 2h, then filter the mixture and rinse it repeatedly with distilled water. It can be dried at 65℃ 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 solution 2+ Concentration is 100mg / L...

Example Embodiment

[0017] Example 2

[0018] The rice straws were taken from Leping City, Jiangxi Province, washed with water, dried at 65°C to a constant weight, crushed, sieved, and selected 100-200 mesh straws for testing.

[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, and it is heated and stirred in a 60℃ water bath to fully react. Filter after 1h, 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, add 20g / L of straw, and then place it in a water bath at 60℃ for 1h, then filter, rinse with distilled water repeatedly until it is neutral, and dry for 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+ Concentration is 100mg / L, pH value is 5.68, Cu in copper sol...

Example Embodiment

[0021] Example 3

[0022] The rice stalks were taken from Leping City, Jiangxi Province, washed with water, dried to a constant weight, crushed with a vibrating mill, and 30 mesh -60 mesh straws were selected for experiment. 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 2% (v / v), add 20 g / L of straw and stir in a 60℃ water bath, and fully react for 1 hour Filter, rinse repeatedly until neutral, and dry. Take a certain amount of oxidized straw and mix with 15g / L disodium hydrogen phosphate solution, add 20g / L straw, and place it in a water bath at 40°C for 2h, filter, rinse repeatedly with distilled water to neutral, and dry spare.

[0023] Take wastewater from the effluent pool of an acid reservoir in 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 added to the wastewater, the addition amount is 10g / L, after a...

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PUM

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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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