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CoMoO4/g-c3n4 composite photocatalyst, and preparation method and application thereof

A technology of g-c3n4 and composite light, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effect of improved ability, good adsorption ability and degradation ability

Active Publication Date: 2018-12-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: the technical problem to be solved by the present invention is to provide a CoMoO 4 / g -C 3 N 4 Composite photocatalyst, the CoMoO 4 load on g-C 3 N 4 surface, inhibiting the Co 2+ leaked and toxic CoMoO 4 Possibility of causing secondary pollution to the water body, the composite material can improve the g-C 3 N 4 The adsorption performance of the composite material can be improved by effectively promoting electron transfer and inhibiting the recombination of electron-hole pairs. The composite material can generate sulfate radicals (E(·SO) by promoting the activation of potassium persulfate 4 2- )=2.7-3.1eV), sulfate radicals have an excellent effect on the degradation of humic acid in water, and the composite material is not limited by the oxygen concentration in aqueous solution when the water contains potassium persulfate, so it can be applied to light Catalytic degradation of anoxic organic polluted wastewater

Method used

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  • CoMoO4/g-c3n4 composite photocatalyst, and preparation method and application thereof
  • CoMoO4/g-c3n4 composite photocatalyst, and preparation method and application thereof
  • CoMoO4/g-c3n4 composite photocatalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] a g-C 3 N 4 The preparation method of powder: get 5g melamine and place in glass magnetic boat, put the glass magnetic boat that fills melamine into tube furnace then, in N 2 Programmed temperature rise under atmosphere: 0-500, 5°C / min; 500°C, 2h; 500-550, 5°C / min; 550°C, 2h, that is, in the temperature range of 0-500°C at a heating rate of 5°C / min Calcined at 500°C for 2 hours, then heated to 550°C at a rate of 5°C / min in the temperature range of 500-550°C and calcined for 2 hours; after obtaining a light yellow solid, grind it to obtain g-C 3 N 4 powder.

Embodiment 2

[0040] A CoMoO 4 The preparation method of nanorods: weigh 0.24195gNa 2 MoO 4 2H 2 O and 0.29103gCo(NO 3 ) 2 ·6H 2 O was added to 50mL deionized water, stirred for 30min and then ultrasonicated for 10min to obtain a mixed solution; the mixed solution was placed in a 100mL reactor, and reacted at 180°C for 5h; after the reaction, naturally cooled to room temperature, and the precipitate in the reactor was taken out was washed three times with deionized water and absolute ethanol, and finally dried at 60 °C to obtain CoMoO 4 Nano stave.

Embodiment 3

[0042] g-C of the present invention 3 N 4 / CoMoO 4 Preparation method of composite material:

[0043] Step 1, get 5g melamine and place in the glass magnetic boat, put the glass magnetic boat that fills melamine into the tube furnace then, in N 2 Programmed temperature rise under atmosphere: 0-500, 5°C / min; 500°C, 2h; 500-550, 5°C / min; 550°C, 2h, that is, in the temperature range of 0-500°C at a heating rate of 5°C / min Calcined at 500°C for 2 hours, then heated to 550°C at a rate of 5°C / min in the temperature range of 500-550°C and calcined for 2 hours; after obtaining a light yellow solid, grind it to obtain g-C 3 N 4 powder;

[0044] Step 2, weigh 0.24195gNa 2 MoO 4 2H 2 O and 0.29103gCo(NO 3 ) 2 ·6H 2 O was added to 50mL deionized water, stirred for 30min and then ultrasonicated for 10min to obtain the mixed solution A;

[0045] Step 3, weigh 0.2187g of g-C prepared in step 1 3 N 4 Add the powder into the mixed solution A, adjust the pH of the mixed reaction s...

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Abstract

The invention discloses a CoMoO4 / g-C3N4 composite photocatalyst. The photocatalyst is two-dimensional lamellar g-C3N4 loaded with a certain amount of CoMoO4 nanorods; and the loading capacity of the CoMoO4 nanorods on g-C3N4 is 5-15 mass%. The invention also discloses a preparation method of the CoMoO4 / g-C3N4 composite photocatalyst and an application of the photocatalyst in the adsorption and degradation of humic acid in anoxic water. The CoMoO4 / g-C3N4 composite material has a good adsorption and degradation ability to humic acid in water under visible lights, and the CoMoO4 / g-C3N4 can effectively activate persulfate to generate sulfate radicals when the persulfate exists in water in order to further improve the ability to degrade organic pollutants in water.

Description

technical field [0001] The present invention relates to a CoMoO 4 / g -C 3 N 4 Composite photocatalysts, also involving the aforementioned CoMoO 4 / g -C 3 N 4 The preparation method and application of a composite photocatalyst belong to the technical field of photocatalysts. Background technique [0002] Humic acid (HA), as a naturally occurring organic electrolyte, can be used to treat heavy metals in water. However, the presence of humic acid in drinking water chlorination usually produces carcinogenic chlorine-containing organic compounds, which seriously threaten human health. Studies have shown that modified TiO 2 It has a certain treatment effect on the degradation of HA in water, but the treatment efficiency is very low, and it often relies heavily on oxygen in water to generate superoxide radicals to oxidize organic matter in water. [0003] Graphite carbon nitride (g-C 3 N 4 ) has become one of the most promising photocatalysts due to its unique two-dimensi...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J37/34C02F1/30C02F1/28C02F101/34C02F101/36
CPCC02F1/281C02F1/30B01J27/24B01J37/082B01J37/343C02F2101/36C02F2101/34C02F2305/10B01J35/39
Inventor 杨汉培高照黄俊杰
Owner HOHAI UNIV
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