Preparation method of visible light catalyst characterized by tight connection
A catalyst and visible light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high photogenerated electron-hole recombination rate, poor stability and recyclability, and low utilization rate of visible light and other problems, to achieve the effect of repeated recycling, good sedimentation and separation effect, and enhanced visible light absorption capacity
Active Publication Date: 2019-01-04
TAIYUAN UNIV OF TECH
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Problems solved by technology
[0013] The present invention is to solve following two technical problems: (1) pure g-C 3 N 4 Photocatalysts have the technical problems of high photogenerated electron-hole recombination rate, low utilization rate of visible light, and poor recycling ability; (2) CdS photocatalyst has technical problems of high photogenerated electron-hole recombination rate, poor stability and recyclability, Provided is a preparation method of a visible light catalyst with tight junctions
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[0034] A preparation method of a closely connected visible light catalyst, comprising the steps of:
[0035] (1) Preparation of g-C 3 N 4 Nanosheets: Put melamine as a precursor in a crucible with a lid and send it into a muffle furnace; heat it from room temperature to 550 °C at a rapid heating rate of 55 °C / min, and keep it at this temperature for 4 h, and wait for natural Grind after cooling to room temperature to obtain light yellow powder g-C 3 N 4 Nanosheets, spare;
[0036] (2) Preparation of CdS hollow microspheres:
[0037] Cadmium nitrate tetrahydrate, thiourea, and glutathione were added to distilled water at a mass ratio of 1.67:1.24:1 and mixed. After mixing, the mass concentration of thiourea was 0.016 g / ml, and stirred for 1 h; then the mixture was transferred to polytetrafluoroethylene In a vinyl fluoride-lined stainless steel autoclave, heat at 250 °C for 3 h; then, the obtained dark yellow product was taken out, centrifuged and washed several times with ...
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The invention belongs to the field of preparation of photocatalysts, and particularly discloses a preparation method of a visible light catalyst characterized by tight connection, and solves the technical problems that at present, a pure g-C3N4 photocatalyst has low catalytic activity, a relatively narrow spectral response range and CdS photocorrosion. The preparation method comprises the following steps: (1), synthesizing a g-C3N4 material according to a high-temperature thermal polymerization method using tripolycyanamide as a precursor; (2), synthesizing hollow microsphere CdS according toa hydrothermal method using thiourea as a sulfur source (3), synthesizing a CdS / g-C3N4 composite photocatalyst according to a low-temperature calcination method. The CdS / g-C3N4 composite photocatalystprovided by the invention can achieve efficient degradation of an organic pollutant, and has good settling performance, so that separation and recycling of the composite photocatalyst are facilitated; due to the tight connection between CdS and g-C3N4, separation and transfer of photogenerated charges at a connection interface of the composite photocatalyst can be accelerated, the photocatalyticactivity of the photogenerated charges can be enhanced, and the cyclic stability of the photogenerated charges can be improved.
Description
technical field [0001] The invention belongs to the field of preparation of photocatalysts, in particular to a method for preparing visible light catalysts with close connections. Background technique [0002] Organic pollutants in industrial wastewater pollute water bodies, endanger human health and destroy ecosystems. As a clean energy, solar energy is a cheap and available renewable energy. As an environmentally friendly material, semiconductor photocatalyst can degrade organic pollutants by using solar energy, and is expected to purify water [1] . So far, TiO 2 Photocatalyst is recognized as one of the most promising photocatalysts, but its high electron-hole recombination rate and wide energy band gap can only respond to the wavelength band in the ultraviolet region, which seriously limits its practical application. [2-3] . Therefore, the search for photocatalysts with high efficiency in the visible light region is the key to the practical application of photocatal...
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Login to View More IPC IPC(8): B01J27/24B01J35/08B01J37/10C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J27/24B01J37/10C02F2101/308C02F2101/38C02F2101/34C02F2101/36C02F2305/10B01J35/23B01J35/51B01J35/39
Inventor 石建惠冯淑婷陈甜刘志超曹昉
Owner TAIYUAN UNIV OF TECH