In-situ-doped cobalt fenton catalyst as well as synthetic method and application thereof

A technology of in-situ doping and synthesis methods, which is applied in chemical instruments and methods, catalysts for physical/chemical processes, water treatment of special compounds, etc., and can solve the problems of poor stability, large metal ion dissolution, and low utilization rate of hydrogen peroxide. , to achieve good stability, strong ability to activate H2O2, and easy recovery and recycling.

Inactive Publication Date: 2018-12-07
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest feature of the heterogeneous Fenton catalyst developed on the basis of the classical Fenton reaction is the solidification of metal ions. Although it makes up for the shortcomings of the classical Fenton reaction to a certain extent, it still does not substantial

Method used

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  • In-situ-doped cobalt fenton catalyst as well as synthetic method and application thereof
  • In-situ-doped cobalt fenton catalyst as well as synthetic method and application thereof
  • In-situ-doped cobalt fenton catalyst as well as synthetic method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An in-situ-Co-g-C 3 N 4 The synthetic method, it comprises the steps:

[0038] (1) 0.04mol melamine and 0.004mol cobalt chloride hexahydrate are dissolved in 20ml absolute ethanol to obtain solution A;

[0039] (2) Place the solution A on a heat-collecting constant temperature magnetic stirrer and stir evenly, and evaporate to dryness in a water bath at 70° C. to obtain a solid product A;

[0040] (3) Transfer the solid product A obtained by evaporating to dryness in step (2) into an oven, dry it completely at 70° C., and grind it evenly;

[0041] (4) The uniformly ground solid product A is placed in a muffle furnace for roasting, the heating rate of the roasting is 5°C / min, the temperature is raised to 550°C and kept for 2h, and the in-situ-Co-g-C is obtained after natural cooling 3 N 4 ;

[0042] (5) to be described in-situ-Co-g-C 3 N 4 After natural cooling, wash by centrifugation with deionized water for 3 to 4 times, and then dry in an oven at 70°C.

Embodiment 2

[0044] An in-situ-Co-g-C 3 N 4 The synthetic method, it comprises the steps:

[0045] (1) 0.02mol melamine and 0.004mol cobalt chloride hexahydrate were dissolved in 15ml absolute ethanol to obtain solution A;

[0046] (2) Place solution A on a heat-collecting constant-temperature magnetic stirrer and stir evenly, and evaporate to dryness in a water bath at 60° C. to obtain solid product A;

[0047] (3) Transfer the solid product A obtained by evaporating to dryness in step (2) into an oven, dry it completely at 50° C., and grind it evenly;

[0048] (4) The uniformly ground solid product A is placed in a muffle furnace for roasting, the heating rate of the roasting is 5°C / min, the temperature is raised to 500°C and kept for 3h, and the in-situ-Co-g-C is obtained after natural cooling 3 N 4 ;

[0049] (5) to be described in-situ-Co-g-C 3 N 4 After natural cooling, centrifuge and wash with deionized water for 3 to 4 times, and then dry in an oven at 50°C.

Embodiment 3

[0051] An in-situ-Co-g-C 3 N 4 The synthetic method, it comprises the steps:

[0052] (1) 0.08mol melamine and 0.004mol cobalt chloride hexahydrate were dissolved in 30ml absolute ethanol to obtain solution A;

[0053] (2) Place the solution A on a heat-collecting constant temperature magnetic stirrer and stir evenly, and evaporate to dryness in a water bath at 90° C. to obtain a solid product A;

[0054] (3) Transfer the solid product A obtained by evaporating to dryness in step (2) into an oven, dry it completely at 80° C., and grind it evenly;

[0055] (4) The uniformly ground solid product A is placed in a muffle furnace for roasting, the heating rate of the roasting is 10°C / min, the temperature is raised to 530°C and kept for 2.5h, and the in-situ-Co-g-C is obtained after natural cooling 3 N 4 ;

[0056] (5) to be described in-situ-Co-g-C 3 N 4 After natural cooling, centrifuge and wash with deionized water for 3 to 4 times, and then dry in an oven at 100°C.

[00...

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Abstract

The invention discloses an in-situ-doped cobalt fenton catalyst as well as a synthetic method and application thereof. The synthetic method of the in-situ-doped cobalt fenton catalyst comprises the following steps: adding a cobalt source into a precursor; and then synthesizing the in-situ-doped cobalt fenton catalyst through an in-situ doping roasting process, wherein the precursor is tripolycyanamide, cyanamide, dicyandiamide or urea. The in-situ-doped cobalt fenton catalyst (in-situ-Co-g-C3N4) disclosed by the invention shows a classic carbon nitride sheet laminated structure, due to formation of a C-O-Co bond in the structure, formation of a double-reaction center is promoted, H2O2 and pollutants are separately reduced and decomposed in an electron-rich center and an electron-deficientcenter, so that the problem of loss of active ingredients caused by self-oxidative reduction of metal ions is avoided. The in-situ-Co-g-C3N4 has a good removal effect on novel organic pollutants whichare difficultly degraded under a neutral condition, and in a process of degrading the pollutants, the in-situ-Co-g-C3N4 has strong ability of activating H2O2 and also has good stability, and moreover, a dissolution ratio of cobalt ions is low.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an in-situ doped cobalt-based Fenton catalyst capable of catalytically degrading organic pollutants, and a synthesis method and application thereof. Background technique [0002] Water is one of the indispensable basic substances for the survival of all life on earth, human life and production. In recent years, human life and production activities have led to the production of various new organic pollutants, such as pesticides, phenols, medicines, dyes, insecticides and endocrine disruptors, etc., which have caused great harm to the natural water environment. pollution. After these new organic pollutants enter the environment, they are difficult to degrade and persist for a long time. They can be transported in various ways and affect the regional and global environment. They will eventually seriously affect human health through the enrichment of the food chain. Due to the compl...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/72C02F101/30
CPCB01J27/24C02F1/722C02F1/725C02F2101/308C02F2305/026
Inventor 吕来胡春王裕猛
Owner GUANGZHOU UNIVERSITY
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