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Method of utilizing biochar for adsorbing orange II dye waste water and catalytically degrading the orange II dye waste water with persulfate

A dye wastewater, persulfate technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, physical/chemical process catalysts, etc., can solve problems such as less biochar, and achieve enhanced removal effect, low cost, and abundant sources. Effect

Inactive Publication Date: 2016-12-14
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biochar is a solid product prepared by pyrolysis of biomass under anoxic or anaerobic conditions. It has similar structural properties to activated carbon and has a good adsorption effect on heavy metals and organic matter. Few, especially the use of hydrofluoric acid pretreatment of biomass to enhance the ability of biochar to catalyze persulfate degradation of dye wastewater, has not been reported yet

Method used

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  • Method of utilizing biochar for adsorbing orange II dye waste water and catalytically degrading the orange II dye waste water with persulfate
  • Method of utilizing biochar for adsorbing orange II dye waste water and catalytically degrading the orange II dye waste water with persulfate

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Effect test

Embodiment 1

[0018] The method for utilizing biochar to adsorb and catalyze persulfate to degrade orange II dye wastewater comprises the following steps:

[0019] a) prepare biochar modified by hydrofluoric acid:

[0020] Add rice husk to a concentration of 0.2mol.L -1 In the hydrofluoric acid solution, the mass ratio of rice husk to hydrofluoric acid solution was 1:20, mixed and stirred for 12 hours, filtered, washed with distilled water to neutrality, and dried at 60°C to obtain modified biomass, modified rice husk biomass The substance is pyrolyzed at 300°C in a biochar preparation device (the application number is a biochar pyrolysis device disclosed in 201310082211.X) to obtain biochar;

[0021] b) Process of degrading orange II dye wastewater:

[0022] Mix persulfate with orange II dye wastewater, the molar ratio of persulfate and orange II dye wastewater is 20:1, add biochar into the mixed solution, the mass concentration of biochar is 10g.L -1 , so that the pH of the mixed solut...

Embodiment 2

[0025] The method for utilizing biochar to adsorb and catalyze persulfate to degrade orange II dye wastewater comprises the following steps:

[0026] a) prepare biochar modified by hydrofluoric acid:

[0027] Add rice husk to a concentration of 2mol.L -1 In the hydrofluoric acid solution, the mass ratio of rice husk to hydrofluoric acid solution is 1:200, mixed and stirred for 24 hours, filtered, washed with distilled water until neutral, and dried at 80°C to obtain modified biomass, modified rice husk biomass The substance is pyrolyzed at 500°C in a biochar preparation device (the application number is: a biochar pyrolysis device disclosed in 201310082211.X) to obtain biochar;

[0028] b) Process of degrading orange II dye wastewater:

[0029] Mix persulfate with orange II dye wastewater, the molar ratio of persulfate and orange II dye wastewater is 100:1, add biochar into the mixed solution, the mass concentration of biochar is 1g.L -1 , the pH of the mixed solution was 1...

Embodiment 3

[0033] The method for utilizing biochar to adsorb and catalyze persulfate to degrade orange II dye wastewater comprises the following steps:

[0034] a) prepare biochar modified by hydrofluoric acid:

[0035] Add rice husk to a concentration of 1mol.L -1 In the hydrofluoric acid solution, the mass ratio of rice husk to hydrofluoric acid solution was 1:100, mixed and stirred for 18 hours, filtered, washed with distilled water until neutral, and dried at 70°C to obtain modified biomass, modified rice husk biomass The substance is pyrolyzed at 400°C in a biochar preparation device (the application number is: a biochar pyrolysis device disclosed in 201310082211.X) to obtain biochar;

[0036] b) Process of degrading orange II dye wastewater:

[0037] Mix persulfate with orange II dye wastewater, the molar ratio of persulfate and orange II dye wastewater is 60:1, add biochar to the mixed solution, the mass concentration of biochar is 5g.L -1 , so that the pH of the mixed solution...

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Abstract

The invention provides a method of utilizing biochar for adsorbing orange II dye waste water and catalytically degrading the orange II dye waste water with persulfate. The method includes the steps of: 1) preparation of the biochar modified by hydrofluoric acid: adding rice hull to a hydrofluoric acid solution, mixing and stirring the solution, filtering the solution and washing the rice hull to neutralization, and drying the rice hull to prepare modified biomass, and pyrolyzing and carbonizing the modified rice hull biomass in a biochar producing apparatus to obtain the biochar; 2) dye waste water degradation: mixing persulfate with the orange II dye waste water and adding the biochar to the mixed solution until the pH value of the mixed solution is 3-10 to carry out a reaction for 4-12 h to complete the degradation of the orange II dye waste water. The rice hull, or rice straw, contains a large quantity of silicon dioxide existing in cellulose and lignin in a net-like status, so that through modification by the hydrofluoric acid, silicon is reacted with fluorine to obtain gas silicon tetrafluoride, thereby forming porous structures on the surface of the rice hull. The rich hull than is pyrolyzed into the biochar, wherein the porous structure are maintained and further improved, so that the modified bichar is significantly increased in specific surface area and has a more reasonable pore size distribution, which promote the process of catalyzing degradation of the dye waste water with persulfate.

Description

technical field [0001] The invention relates to a method for degrading dye wastewater by persulfate, in particular to a method for degrading orange II dye wastewater by utilizing biochar adsorption and catalyzing persulfate. Background technique [0002] Dye wastewater has the characteristics of "three highs and one low" (high COD, high chroma, high salt content, low BOD5 / COD), which is one of the difficulties and hot spots in wastewater treatment. Wherein β-naphthol azo sodium p-benzenesulfonate is also called orange II, and orange II often exists in dye wastewater. At present, the persulfate activation technology based on sulfate radical radical is a new type of treatment organic pollutants (including Dye wastewater) advanced oxidation technology, and by measuring the absorbance of the dye in the filtrate, and then calculate the removal rate. [0003] Activated carbon can be used as a catalyst to catalyze the degradation of organic pollutants by persulfate. Biochar is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/28B01J20/20B01J21/18C02F101/30
CPCC02F1/725B01J20/20B01J21/18C02F1/288C02F2101/308
Inventor 李飞跃汪建飞王德生谢越马万征
Owner ANHUI SCI & TECH UNIV
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