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Method for degrading organic pollutants in wastewater by catalyzing persulfate

A technology of organic pollutants and persulfate, applied in water pollutants, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of high cost, secondary pollution of metal ions, high energy consumption, etc., and achieve long life , good stability and high degradation efficiency

Active Publication Date: 2017-10-27
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only using physical methods to activate has the disadvantages of high energy consumption and high cost. Although chemical methods such as transition metal ions can be carried out quickly at room temperature and normal pressure, and do not require additional energy, they have been widely studied and applied, but there are metal ions The problem of secondary pollution

Method used

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  • Method for degrading organic pollutants in wastewater by catalyzing persulfate
  • Method for degrading organic pollutants in wastewater by catalyzing persulfate
  • Method for degrading organic pollutants in wastewater by catalyzing persulfate

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preparation example Construction

[0037] Wherein, the composite catalyst g-C 3 N 4 -Cu 2 O preparation methods include:

[0038] providing a first solution comprising Cu in a dissolved state 2+ ;

[0039] Add g-C to the first solution 3 N 4 , stirred, sonicated to obtain a suspension;

[0040] Add xylitol to the suspension under stirring, adjust the pH value to 10-12, and stir to obtain a mixed solution;

[0041] Heating the mixed solution to 150-200°C in a high-pressure reaction vessel, reacting at a constant temperature for 25-35 hours, and cooling naturally to obtain a reactant;

[0042] The cooled reactant was separated by suction filtration to obtain a solid product, which was washed and vacuum-dried;

[0043] The solid product is heated to 150-250°C under the protection of the atmosphere and kept at a constant temperature for 1h-3h to obtain g-C 3 N 4 -Cu 2 O composite catalyst.

[0044] The persulfates are selected from monopersulfates and complexes of monopersulfates, and peroxodisulfates a...

Embodiment 1

[0052] Raw Materials and Reagents

[0053] Dicyandiamide (C 2 h 4 N 4 ), copper sulfate pentahydrate (CuSO 4 ·5H 2 O), sodium hydroxide (NaOH), hydrochloric acid (HCl), tert-butanol (C 4 h 10 O), p-benzoquinone (C 6 h 4 o 2 ), disodium edetate (C 10 h 14 N 2 Na 2 o 8 ) were of analytical grade (AR), purchased from Sinopharm Chemical Reagent Co., Ltd.; xylitol (C 5 h 12 0 5 ), methyl orange (C 14 h 14 N 3 NaO 3 S), rhodamine B, methylene blue, etc. were of analytical grade (AR), purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0054] g-C 3 N 4 preparation of

[0055] Preparation of g-C by High Temperature Pyrolysis of Dicyandiamide 3 N 4 . Weigh 4g of dicyandiamide and place it in a corundum crucible with a cover, put the crucible in a muffle furnace, and place it in an air atmosphere at 2k / min -1 The heating rate was programmed to raise the temperature to 550°C and keep it warm for 4 hours. After the product was naturally cooled, th...

Embodiment 2

[0062] g-C not pre-protonated 3 N 4 preparation of

[0063] The g-C 3 N 4 The preparation method includes: weighing 4g of dicyandiamide and placing it in a corundum crucible with a cover, putting the crucible into a muffle furnace, and heating it up to 550°C at a heating rate of 2k / min in an air atmosphere, and keeping it warm for 4h , after the product was naturally cooled, the obtained yellow powder was ground for 30 min, and the obtained product was ground for later use.

[0064] g-C 3 N 4 -Cu 2 Preparation of O composite catalyst

[0065] The g-C 3 N 4 grow to Cu 2 O surface, the specific steps are as follows: first, 1.25g CuSO 4 ·5H 2 O was added to 40mL deionized water, when the solution turned dark blue, continue to add g-C to the above solution 3 N 4 The powder was magnetically stirred for 2 h and then ultrasonicated for 2 h to obtain a homogeneous suspension (g-C 3 N 4 with Cu 2 The mass ratio of O is 1:1), then under the condition of magnetic stirrin...

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Abstract

The invention provides a method for degrading organic pollutants in wastewater by catalyzing persulfate. The method comprises the following steps: adding a composite catalyst g-C3N4-Cu2O into wastewater, and stirring and adsorbing under a dark environment to form a mixture; adding persulfate into the mixture to form a reaction system; putting the reaction system within a visible light irradiation range, and enabling the visible light to cooperate with g-C3N4-Cu2O to catalyze and activate the persulfate to generate a sulfate radical free group to degrade the organic pollutants in wastewater. According to the method provided by the invention, the g-C3N4-Cu2O is taken as the catalyst, the persulfate is taken as the oxidizing agent, and the visible light is cooperated with the g-C3N4-Cu2O is taken to degrade the organic pollutants in wastewater. The method for degrading organic pollutants in wastewater provided by the invention is remarkable in effect, is high in degradation rate and is stable.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a method for catalyzing persulfate to degrade organic pollutants in waste water. Background technique [0002] With the rapid development of the economy and the continuous progress of the society, the ecological environment on which human beings rely is increasingly seriously polluted and destroyed. A large number of toxic, harmful and refractory pollutants (such as dyes, pesticides, herbicides, antibiotics, preservatives, detergents, insecticides, disinfectants, etc.) enter the environmental system, causing serious pollution to water bodies. According to the China Environmental Quality Announcement issued by the national environmental protection department, 436 rivers have been polluted to varying degrees, accounting for 82% of the total surveyed. As of 2011, all major rivers in the country have been polluted to varying degrees, and the pollution is increasing, especially i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/30C02F101/38C02F101/34C02F101/30
CPCC02F1/725
Inventor 李东亚夏东升徐海明左诗雨廖伟曹刚袁向娟孙磊
Owner WUHAN TEXTILE UNIV
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