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Nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and preparation method of composite catalyst

A nitrogen-doped porous carbon and composite catalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of good electron transport performance, secondary pollution of catalysts, and difficulty in recycling. Achieve significant environmental and economic significance and overcome the effect of large dosage

Active Publication Date: 2019-04-12
NANJING UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the existing advanced oxidation technology based on sulfate radicals, homogeneous catalysis is easy to cause secondary pollution and the catalyst is difficult to recycle. It is difficult for ordinary heterogeneous catalysts to have high surface active site density, strong organic enrichment ability, electronic Good transport performance leads to low catalytic efficiency and other problems. The present invention provides a nitrogen-doped porous carbon polyhedron@nano-cobalt phosphide composite catalyst that can efficiently activate persulfate and its preparation method

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  • Nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and preparation method of composite catalyst
  • Nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and preparation method of composite catalyst
  • Nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and preparation method of composite catalyst

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Effect test

Embodiment 1

[0034] A nitrogen-doped porous carbon polyhedron@nano cobalt phosphide composite catalyst capable of efficiently activating persulfate, the steps of which are:

[0035] a. Basic cobalt carbonate (Co(CO 3 ) 0.5 (OH)·0.11H 2 O) nanowire preparation: 0.56g CoSO 4 ·7H 2 O was dissolved in 40 mL of a mixture consisting of 7 mL of glycerin and 33 mL of distilled water and stirred evenly. After adding 0.1 g of urea to dissolve, the resulting solution was transferred to a 50 mL hydrothermal reactor and heated at 170 °C for 24 h. After the reaction, the reactor was naturally cooled to room temperature, and the precipitate was collected by centrifugation, washed alternately with water and alcohol for several times, and then dried to obtain Co(CO 3 ) 0.5 (OH)·0.11H 2 O nanowires.

[0036] b. Preparation of cobalt phosphide (CoP) nanowires: Co(CO) obtained in step a 3 ) 0.5 (OH)·0.11H 2 O nanowires and NaH 2 PO 2 respectively piled up in different positions of the same magneti...

Embodiment 2

[0043] With embodiment 1, difference is:

[0044] CoSO in step a 4 ·7H 2 The mass of O is 1.2g, which is dissolved in a mixed solution consisting of 10mL glycerin and 30mL distilled water, the mass of urea is 0.14g, the hydrothermal reaction temperature is 180°C, and the reaction time is 30h;

[0045] Under the same experimental conditions as in Example 1, the obtained catalyst had a degradation rate of 99% to bisphenol A within 8 minutes.

Embodiment 3

[0047] With embodiment 1, difference is:

[0048] In step a, the cobalt salt was changed to cobalt chloride, the mass of which was 0.4g, dissolved in a mixed solution consisting of 5mL of glycerin and 35mL of distilled water, the mass of urea was 0.06g, the hydrothermal reaction temperature was 160°C, and the reaction time was 18h;

[0049] Under the same experimental conditions as in Example 1, the obtained catalyst had a degradation rate of 89% to bisphenol A within 8 minutes.

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Abstract

The invention belongs to the field of water pollution control, and particularly relates to a nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and a preparation method of the composite catalyst. The preparation method comprises the steps that basic cobaltous carbonate nanowires are prepared by using a hydrothermal method, the basic cobaltous carbonate nanowires are phosphorized to obtain cobalt phosphide nanowires, a metal-organic framework ZIF-8 grows around the cobalt phosphide nanowires by using a self-assemblymethod, and through high-temperature calcination, the nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst is obtained. Compared with an existing heterogeneous catalyst, the composite catalyst has nonmetal catalysis activity and metal catalysis activity and is high in persulfate activating efficiency, high in free radical production, wide in pH application range and capable of being recycled and widely used, obviously reducing the consumption of a catalyst and a oxidizing agent and shortening reaction time.

Description

technical field [0001] The invention belongs to the field of water pollution control, in particular to a nitrogen-doped porous carbon polyhedron@nano cobalt phosphide composite catalyst capable of efficiently activating persulfate and a preparation method thereof. Background technique [0002] Refractory organic pollutants produced by industrial production, etc. enter water bodies and will be transmitted through the food chain and endanger human health. Conventional biochemical treatment is difficult to effectively remove refractory organic matter, so it is necessary to use advanced treatment process to achieve removal. The advanced oxidation technology based on sulfate radical has become an advantageous process for removing refractory organic matter due to its high redox potential, easy generation, and wide pH range. The generation of sulfate radicals by homogeneous catalysis is faced with the problems of large dosage of reagents and high loss rate. Therefore, a lot of res...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/72C02F101/34
CPCC02F1/725B01J27/24C02F2101/345B01J35/23
Inventor 刘福强朱长青江昊岳彩良程松李爱民
Owner NANJING UNIV
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