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Method for selective oxidation of o-chlorophenol in alkaline wastewater

An o-chlorophenol, selective technology, applied in the field of selective oxidation of o-chlorophenol, can solve problems such as inability to remove well, limited reaction, etc.

Inactive Publication Date: 2018-04-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional Fenton reaction has a good effect on the degradation of organic matter, the reaction is limited to acidic (pH 3 or so) conditions, and cannot be removed well in an alkaline environment

Method used

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  • Method for selective oxidation of o-chlorophenol in alkaline wastewater
  • Method for selective oxidation of o-chlorophenol in alkaline wastewater
  • Method for selective oxidation of o-chlorophenol in alkaline wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh 6.04875g of Na 2 MoO 4 The solid was dissolved in 100 mL of distilled water to prepare 0.25M Na 2 MoO 4 solution;

[0029] 2) Pipette 200 μl o-chlorophenol with a pipette gun, and dilute it in a 250mL volumetric flask to prepare a 1g / L o-chlorophenol stock solution;

[0030] 3) Take Na 2 MoO 4 Add distilled water (a solution) to the stock solution to have a final molybdate concentration of 2 mM, and adjust the pH to 8; add o-chlorophenol to distilled water (b solution), adjust the pH to 8, and mix the two solutions;

[0031] 4) Mix a and b solutions in step 2) and wrap the reaction bottle with a black bag to make the reaction under dark reaction conditions, add hydrogen peroxide to the system at a concentration of 500 mg / L, and place the reaction system on a constant temperature shaker;

[0032] When the concentration of hydrogen peroxide is 500mg / L at pH 8, the degradation of p-chlorophenol is as follows Image 6 shown. The basic reaction reached equilib...

Embodiment 2

[0034] 1) Weigh 12.0975g of Na 2 MoO 4 Dissolve the solid in 100 mL distilled water to prepare 0.5M Na 2 MoO 4 solution;

[0035] 2) Pipette 400 μl o-chlorophenol with a pipette gun, and dilute it in a 250mL volumetric flask to prepare a 1g / L o-chlorophenol stock solution;

[0036] 3) Take Na 2 MoO 4 Add distilled water (solution a) to the stock solution to make the final concentration of molybdate 0.5mM, and adjust the pH to 11; take o-chlorophenol and add it to distilled water (solution b), adjust the pH to 11, and mix the two solutions;

[0037] 4) Mix a and b solutions in step 2) and wrap the reaction bottle with a black bag to make the reaction under dark reaction conditions, add hydrogen peroxide to the system at a concentration of 1000 mg / L, and place the reaction system on a constant temperature shaker;

[0038] When the hydrogen peroxide concentration rises to 1000mg / L at pH 11, the degradation of p-chlorophenol is as follows Image 6 shown. After 8 hours, the...

Embodiment 3

[0040] 1) Weigh 6.04875g of Na 2 MoO 4 The solid was dissolved in 100 mL of distilled water to prepare 0.25M Na 2 MoO 4 solution;

[0041] 2) Pipette 200 μl o-chlorophenol with a pipette gun, and dilute it in a 250mL volumetric flask to prepare a 1g / L o-chlorophenol stock solution;

[0042] 3) Take Na 2 MoO 4 The stock solution was added to distilled water (a solution) with a final molybdate concentration of 1 mM, and the pH was adjusted to 12; the o-chlorophenol stock solution was added to distilled water (b solution), and the pH was adjusted to 12, and the two solutions were mixed;

[0043] 4) Mix a and b solutions in step 2) and wrap the reaction bottle with a black bag to make the reaction under dark reaction conditions, add hydrogen peroxide to the system at a concentration of 1000 mg / L, and place the reaction system on a constant temperature shaker;

[0044] When the concentration of hydrogen peroxide is 1000mg / L at pH 12, the degradation of o-chlorophenol is as fo...

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Abstract

The invention relates to a method for selective oxidation of o-chlorophenol in alkaline wastewater. The method comprises the following steps: weighing solid Na<2>MoO<4>.2H<2>O, dissolving the solid indistilled water to prepare a Na<2>MoO<4> stock solution with a concentration of 0.25 to 0.5 M; transferring the liquid medicine o-chlorophenol with a pipette gun to prepare an o-chlorophenol stock solution with a concentration of 1-2 g / L; adding distilled water into the Na<2>MoO<4> stock solution for dilution and pH value regulation so as to obtain an alkaline solution a; adding the o-chlorophenol stock solution into distilled water until a final concentration is 100 mg / L and regulating the pH value of the obtained solution so as to obtain an alkaline solution b; mixing the solution a with the solution b, keeping the obtained mixture in a dark place so as to allow a reaction to be carried out under dark reaction conditions, adding a hydrogen peroxide solution, and placing the obtained reaction system in a water-bath pot with a temperature of 30 DEG C and a rotation speed of 150 r / min; and reacting molybdate with hydrogen peroxide under alkaline conditions to produce <1>O<2> and O<2><.-> oxidation materials, and the produced <1>O<2> and O<2><.-> have good degradation effect and oxidation selectivity on o-chlorophenol.

Description

technical field [0001] The invention relates to a method for selectively oxidizing o-chlorophenol by using a catalyst to catalyze hydrogen peroxide to generate singlet oxygen and superoxide free radicals, and belongs to the field of selectively oxidizing and degrading organic matter in sewage and wastewater. Background technique [0002] The problem of water environment has always been the most concerned issue in the development of human society and economy. How to effectively degrade persistent and refractory organic pollutants in water is an environmental issue we are concerned about. Advanced Oxidation Technology is a new technology for treating refractory organic pollutants. It produces highly active hydroxyl radicals (HO·) through the reaction to oxidize and degrade refractory organic pollutants in wastewater into non-toxic or low-toxic small molecules. substances, and even directly mineralized into carbon dioxide and water. However, this process requires the addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/36
CPCC02F1/722C02F1/725C02F2101/36
Inventor 韩煦王梦
Owner TIANJIN UNIV
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