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Method for treating chromium-containing wastewater by using straw cellulose-cerium oxide composite through photocatalytic reduction

A technology of straw cellulose and cerium oxide, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as hazards and carcinogenicity, and achieve high photocatalytic removal rate , reduced bandgap width, and high industrial application value

Active Publication Date: 2017-02-08
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium-containing wastewater is difficult to be biodegraded after being discharged into the water body, and it will cause potential harm to aquatic animals, plants and humans, and even cause cancer

Method used

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  • Method for treating chromium-containing wastewater by using straw cellulose-cerium oxide composite through photocatalytic reduction
  • Method for treating chromium-containing wastewater by using straw cellulose-cerium oxide composite through photocatalytic reduction
  • Method for treating chromium-containing wastewater by using straw cellulose-cerium oxide composite through photocatalytic reduction

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Experimental program
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Effect test

Embodiment 1

[0038] A method for treating chromium-containing wastewater by catalytic reduction of straw cellulose-cerium oxide composite of the present invention comprises the following steps in sequence:

[0039] (1) Weighing 10-20 grams of straw pulp, adding it to an aqueous solution containing 0.05-0.2 grams of TEMPO and 0.5-1.5 grams of sodium bromide;

[0040] (2) configure a sodium hypochlorite solution with a mass fraction of 3 to 6%, and adjust its pH in a suitable range with a hydrochloric acid solution of 0.05 to 0.3 mol / liter;

[0041] (3) Slowly add (2) to the mixed solution obtained in step (1), and stir vigorously;

[0042] (4) adjust step (3) pH in a suitable range with 0.2~1.0 mol / liter of sodium hydroxide solution and keep the reaction for several hours;

[0043] (5) After the reaction product of step (4) is suction filtered to remove water, it is washed with deionized water repeatedly until the pH value of the solution is close to 7.0, and the washed reaction product is...

Embodiment 2

[0049] A method for treating chromium-containing wastewater by catalytic reduction of straw cellulose-cerium oxide composite of the present invention comprises the following steps in sequence:

[0050] (1) Weighing 10-20 grams of straw pulp, adding it to an aqueous solution containing 0.05-0.2 grams of TEMPO and 0.5-1.5 grams of sodium bromide;

[0051] (2) configure a sodium hypochlorite solution with a mass fraction of 3 to 6%, and adjust its pH in a suitable range with a hydrochloric acid solution of 0.05 to 0.3 mol / liter;

[0052] (3) Slowly add (2) to the mixed solution obtained in step (1), and stir vigorously;

[0053] (4) adjust step (3) pH in a suitable range with 0.2~1.0 mol / liter of sodium hydroxide solution and keep the reaction for several hours;

[0054] (5) After the reaction product of step (4) is suction filtered to remove water, it is washed with deionized water repeatedly until the pH value of the solution is close to 7.0, and the washed reaction product is...

Embodiment 3

[0060] A method for treating chromium-containing wastewater by catalytic reduction of straw cellulose-cerium oxide composite of the present invention comprises the following steps in sequence:

[0061] (1) Weighing 10-20 grams of straw pulp, adding it to an aqueous solution containing 0.05-0.2 grams of TEMPO and 0.5-1.5 grams of sodium bromide;

[0062] (2) configure a sodium hypochlorite solution with a mass fraction of 3 to 6%, and adjust its pH in a suitable range with a hydrochloric acid solution of 0.05 to 0.3 mol / liter;

[0063] (3) Slowly add (2) to the mixed solution obtained in step (1), and stir vigorously;

[0064] (4) adjust step (3) pH in a suitable range with 0.2~1.0 mol / liter of sodium hydroxide solution and keep the reaction for several hours;

[0065] (5) After the reaction product of step (4) is suction filtered to remove water, it is washed with deionized water repeatedly until the pH value of the solution is close to 7.0, and the washed reaction product is...

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Abstract

The invention relates to a method for treating chromium-containing wastewater by using a straw cellulose-cerium oxide composite through photocatalytic reduction. The method comprises the following steps: dispersing straw pulp in tetramethyl piperidine nitrogen oxide and sodium bromide, dropwise adding an alkaline sodium hypochlorite solution; reacting for several hours while vigorously stirring, and regulating pH of the solution by using sodium hydroxide; carrying out suction filtration, washing and drying to obtain nano straw cellulose; dissolving a proper amount of straw cellulose and a proper amount of cerium nitrate hexahydrate in a mixed solution of deionized water and ethyl alcohol and uniformly stirring, transferring a mixture into a high-pressure reactor for reacting; centrifugally separating the mixture and then washing the mixture with the ethyl alcohol and the deionized water; drying the mixture to obtain a finished straw cellulose-cerium oxide product; adding the finished straw cellulose-cerium oxide product into wastewater containing hexavalent chromium in an initial concentration of 3-10mg / L, uniformly stirring and then irradiating for 30 minutes or longer by using a xenon lamp, and measuring the concentration of the hexavalent chromium in the treated wastewater and calculating the removal rate of the hexavalent chromium. The method for treating the chromium-containing wastewater by using the straw cellulose-cerium oxide composite is high in removal rate of the hexavalent chromium and low in treatment cost, and is environmental-friendly.

Description

technical field [0001] The invention relates to a method for treating chromium-containing wastewater by photocatalytic reduction of straw cellulose-cerium oxide composite, and belongs to the technical field of sewage treatment. Background technique [0002] In recent years, with the public's increasing awareness of environmental protection, various new water treatment technologies have emerged as the times require. Photocatalytic technology is considered to be one of the new water treatment technologies with great development potential. Due to its direct use of sunlight and its environmental friendliness, it is attracting more and more attention. The vigorous development of the metallurgical and mining industries has resulted in an increasing amount of wastewater containing heavy metal chromium being discharged into the environment, which poses a huge threat to the environment. Chromium-containing wastewater is difficult to be biodegraded after being discharged into water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/30
CPCC02F1/30B01J23/10C02F2101/22B01J35/39
Inventor 张娅温芳芳谈晶王宏归周芝峰陈雅洁刘婧冉
Owner YANGZHOU UNIV
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