Preparation method of cross-linked chitosan modified shaddock peel adsorption material for removing low-concentration heavy metals in waste water

A low-concentration heavy metal, cross-linked chitosan technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of high metal concentration in effluent, secondary pollution, and high calcium content in wastewater. Achieve the effects of high processing efficiency, low cost and simple preparation steps

Inactive Publication Date: 2016-01-27
雷春生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: Although the chemical precipitation method can quickly remove metal ions in wastewater, but there are problems such as high metal concentration in the effluent, easy to produce secondary pollution, high calcium content in wastewater, and difficulty in recycling, etc., provides a A preparation method for cross-linked chitosan modified grapefruit peel to remove low-concentration heavy metal adsorption materials in wastewater. The present invention mainly uses cross-linked chitosan to treat low-concentration heavy metal wastewater, and combines the adsorption capacity of grapefruit peel for processing. The present invention The mercury content in the treated wastewater of the invention is 40-45 mg / L reduced to 0.5-1 mg / L, the nickel content is 30-40 mg / L reduced to 0.5-0.7 mg / L, and the copper ion 25-35 mg / L is reduced to 0.04-0.05 mg / L, high treatment efficiency, no secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020]First by weight parts, choose respectively the chitosan of 45 parts, the mass fraction of 15 parts is the methanol aqueous solution of 40%, the mass fraction of 20 parts is the benzaldehyde solution of 10% and the acetone of 20 parts, at a temperature of 90 Under the condition of constant temperature water bath at ℃, reflux in a three-necked flask for 1 h, filter it after the reflux is completed, and collect the filter residue; soak the above collected filter residue at a temperature of 30 °C in a 4% hydrochloric acid solution for 48 h, After the benzaldehyde is removed, soak it in 0.5mol / L NaOH solution for 5 minutes. After pickling and alkaline leaching, wash it repeatedly with deionized water until the pH is 7.0, and then dry it in an oven at 60°C for 12 hours to prepare To obtain modified chitosan particles; then according to the mass ratio of 1:10, the modified chitosan particles prepared above and the acetic acid aqueous solution with a mass fraction of 1% are stirr...

example 2

[0022] First by weight parts, choose respectively the chitosan of 20 parts, the mass fraction of 30 parts is the methanol aqueous solution of 40%, the mass fraction of 25 parts is the benzaldehyde solution of 10% and, the acetone of 25 parts, at temperature Under the condition of constant temperature water bath at 85°C, reflux in a three-neck flask for 1 hour, filter it after the reflux is completed, and collect the filter residue; soak the above-mentioned filter residue in a 4% hydrochloric acid solution at a temperature of 25°C for 48 hours , after benzaldehyde is removed, soak in 0.5mol / L NaOH solution for 3 minutes, after pickling and alkaline leaching, wash repeatedly with deionized water until the pH is 7.0, and then dry it in an oven at 55°C for 10 hours. Modified chitosan particles are prepared; then according to the mass ratio of 1:10, the modified chitosan particles prepared above and the acetic acid aqueous solution with a mass fraction of 1% are stirred and mixed un...

example 3

[0024] First by weight parts, choose respectively the chitosan of 40 parts, the mass fraction of 20 parts is the methanol aqueous solution of 40%, the mass fraction of 20 parts is the benzaldehyde solution of 10% and the acetone of 20 parts, at a temperature of 87 Under the condition of constant temperature water bath at ℃, reflux in a three-necked flask for 1 hour, filter it after the reflux is completed, and collect the filter residue; soak the above-mentioned filter residue at a temperature of 27°C in a 4% hydrochloric acid solution for 48 hours, After the benzaldehyde is removed, it is soaked in 0.5mol / L NaOH solution for 4 minutes. After pickling and alkaline leaching, it is repeatedly washed with deionized water until the pH is 7.0, and then dried in an oven at 57°C for 11 hours to prepare To obtain modified chitosan particles; then according to the mass ratio of 1:10, the modified chitosan particles prepared above and the acetic acid aqueous solution with a mass fraction...

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Abstract

The invention relates to a preparation method of a cross-linked chitosan modified shaddock peel adsorption material for removing low-concentration heavy metals in waste water and belongs to the field of waste water treatment. According to the preparation method, substances, such as chitosan, methanol water and the like, are filtered after being subjected to water circumfluence; filter residues are acid-pickled, alkaline-leached, washed and dried and are mixed with acetic acid and epichlorohydrin; after a pH value is regulated, the reaction is performed; by suction filtration, washing, drying and sieving, chitosan powder is obtained; then shaddock peel is obtained, is washed and dried and is ground into particles; the particles are added into sodium hydroxide solution and absolute ethyl alcohol for soaking; after centrifugation is carried out and the pH value is regulated, the obtained product is dried and is placed into a vacuum flask; in a negative pressure state, the obtained product is added into chitosan modification liquid for soaking; processing is carried out in a plasma form; filtration is carried out to obtain filter residues; and the filter residues are washed and dried to obtain the cross-linked chitosan modified shaddock peel adsorption material. In waste water treated by the cross-linked chitosan modified shaddock peel adsorption material prepared by the preparation method, mercury content is reduced to 0.5 to 1mg / L, nickel content is reduced to 0.5 to 0.7mg / L, and copper ion content is reduced to 0.04 to 0.05mg / L; treatment efficiency is high; secondary pollution cannot be generated.

Description

technical field [0001] The invention relates to a preparation method of a cross-linked chitosan-modified pomelo peel to remove low-concentration heavy metal adsorption materials in waste water, belonging to the field of waste water treatment. Background technique [0002] Most of the heavy metal wastewater comes from mining, mineral processing, smelting, metal processing and other enterprises. Through the food chain, it is easy to accumulate in organisms and endanger human health. The methods for treating heavy metal wastewater can be classified into three categories: chemical method, physical chemical method and biological method. Among them, chemical methods include neutralization precipitation method, sulfide precipitation method, ferrite precipitation method, barium salt precipitation method, etc.; physical and chemical methods include ion exchange method, adsorption method, solvent extraction method, liquid membrane method, reverse osmosis method and electrolysis method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/24C02F1/28C02F101/20
Inventor 雷春生高力群薛红娟
Owner 雷春生
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