Method for removing hexavalent chromium in wastewater by using beta-cyclodextrin chitosan and walnut shell biochar compounded adsorbent

A technology of β-cyclodextrin and chitosan, which is applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of low production cost, limited application, limited hydrophobic area and limited catalytic activity, etc. Achieve the effect of low cost, easy surface functional groups, and more surface functional groups

Inactive Publication Date: 2016-01-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

β-cyclodextrin has a moderate molecular hole, a wide range of applications, and low production cost. It is currently the most widely used cyclodextrin product in industry, but its hydrophobic region and catalytic activity are limited, which limits its application to a certain extent.

Method used

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  • Method for removing hexavalent chromium in wastewater by using beta-cyclodextrin chitosan and walnut shell biochar compounded adsorbent
  • Method for removing hexavalent chromium in wastewater by using beta-cyclodextrin chitosan and walnut shell biochar compounded adsorbent
  • Method for removing hexavalent chromium in wastewater by using beta-cyclodextrin chitosan and walnut shell biochar compounded adsorbent

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Experimental program
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Effect test

Embodiment 1

[0025] A kind of β cyclodextrin chitosan walnut shell biochar composite material of the present invention, this composite material is prepared by following method:

[0026] (1) Dissolve 6g of β-cyclodextrin and 1g of chitosan in 120ml of 1mol / L hydrochloric acid solution, add it into a three-necked bottle, stir evenly to obtain a milky white solution, and when it is heated to about 85°C and becomes colorless, add 50 % glutaraldehyde 3ml, continue to heat the reaction for 1h and then turn light yellow and take it out;

[0027] (2) After the product in (1) is adjusted to a pH value of 7 to 8 and turns brown with a 1mol / L NaOH solution, cool, precipitate, filter, and dry to obtain a β-cyclodextrin chitosan product;

[0028] (3) Put the dried and ground walnut shell biomass into a tube furnace at 300-600°C, 2 , Burn for 1-2 hours to get walnut shell biochar. Wash the obtained magnetic biochar with deionized water for 2-3 times, dry at 50-60°C, grind, and pass through a 150-mesh ...

Embodiment 2

[0032] The β cyclodextrin chitosan walnut shell biochar composite material prepared by embodiment 1 is applied to the treatment of hexavalent chromium ion wastewater, comprising the following steps: configure 8 parts of 100mg / L chromium solution, use 1mol / L NaOH and HCl adjusted pH to 2, 3, 4, 5, 6, 7, 8 and 9, respectively. Add the above-mentioned β-cyclodextrin chitosan walnut shell biochar composite material, and the amount of adsorbent is 0.1 g / L. They were placed in constant temperature shaking at 25°C. The rotating speed of the constant temperature oscillator in the water bath is 160rpm, and the shaking time is 24h. After the reaction is over, put it on filter paper for filtration or static precipitation to get the upper layer solution, separate the adsorbent from the solution, and the adsorption process ends. The content of unadsorbed hexavalent chromium in the wastewater was determined by ultraviolet spectrophotometry, and the calculated adsorption results are shown ...

Embodiment 3

[0037] The β cyclodextrin chitosan walnut shell biochar composite material prepared by embodiment 1 is applied to the treatment of hexavalent chromium ion wastewater, comprising the following steps: getting 50mL initial concentration is the hexavalent chromium solution of 100mg / L, adjusting the concentration of the solution The pH value is 2.0, add the β cyclodextrin chitosan biochar composite material that embodiment 1 makes, the consumption of this composite is 0.1g / L, carry out adsorption in the constant temperature water bath shaker of 25, 35 and 45 ℃ respectively Reaction, the speed of the water bath constant temperature oscillator is 160rpm, after 24 hours, take it out and place it on filter paper to filter or statically precipitate to get the upper layer solution, separate the adsorbent from the solution, after the adsorption process is over, use UV spectrophotometry to measure the unadsorbed in the waste water. The content of hexavalent chromium and the calculated adsor...

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Abstract

The present invention discloses a method for removing hexavalent chromium in wastewater by using a beta-cyclodextrin chitosan and walnut shell biochar compounded adsorbent, wherein beta-cyclodextrin and chitosan are compounded, and then the beta-cyclodextrin chitosan is grafted on a walnut shell biochar substrate so as to form the complex. The preparation method comprises: compounding beta-cyclodextrin and chitosan, carrying out high temperature calcination on walnut shell biomass powder formed through air-drying and grinding so as to prepare walnut shell biochar, and compounding the beta-cyclodextrin chitosan onto the biochar surface. The application steps comprise: adding the composite material to hexavalent chromium wastewater with a hexavalent chromium concentration of 20-800 mg / L, wherein the use amount of the composite material is 0.1-1 g / L; and carrying out an oscillation adsorption reaction for a certain time at a temperature of 20-50 DEG C under a pH value of 2-9, and collecting the adsorbent through filtration or precipitation separation so as to complete the removal of the hexavalent chromium ions in the wastewater. The method of the present invention has advantages of low cost, simple process, high adsorption performance, effective waste utilization, easy separation, environmental protection, and the like.

Description

technical field [0001] The invention relates to the application of biochar composite biological materials in the field of wastewater treatment, in particular to the application of beta-cyclodextrin chitosan modified walnut shell biochar to remove hexavalent chromium in wastewater. Background technique [0002] Heavy metal pollution in water is an environmental pollution problem with great harm and influence today, and heavy metal chromium pollution is one of the common water pollution. Heavy metal chromium pollution mainly comes from cosmetic raw materials, leather preparations, chrome-plated parts of metal parts, industrial pigments, leather tanning, rubber and ceramic raw materials, etc.; the toxicity of chromium is related to its valence state, and hexavalent chromium is 100 times more toxic than trivalent chromium , and easily absorbed by the body and accumulate in the body, trivalent chromium and hexavalent chromium can be transformed into each other. If the human body...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/24B01J20/30C02F101/22
Inventor 黄熙贤刘云国曾光明丁洋张明明谭小飞周璐王姝凡
Owner HUNAN UNIV
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