CdS nano-snowflake photocatalyst as well as preparation method and application thereof

A photocatalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of difficult recovery and separation, less exposure of high catalytic activity surfaces, and low utilization of sunlight.

Inactive Publication Date: 2019-02-15
QINGDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even mature photocatalytic materials still have many disadvantages: less exposure of high catalytic active surface, difficult recovery and separation, excitation only under ultraviolet light conditions, low utilization rate of sunlight, etc. (Chen Shunsheng, Cao Xin, Chen Chunhui, Zhou Yuwen, Lu Xiaoju.TiO 2 Research Progress of Matrix Composite Photocatalysts[J].Functional Materials,2018,49(07):7039-7049+7056.)
However, so far, there are few reports on CdS nano-snowflake photocatalyst and its preparation, and the application of CdS nano-snowflake with high activity exposed surface (002 crystal plane) as photocatalyst in catalytic degradation of pollutants.

Method used

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  • CdS nano-snowflake photocatalyst as well as preparation method and application thereof
  • CdS nano-snowflake photocatalyst as well as preparation method and application thereof
  • CdS nano-snowflake photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take by weighing cadmium acetate dihydrate and ammonium thiocyanate respectively in a ratio of 2:3 (cadmium acetate dihydrate: ammonium thiocyanate) by mass ratio to form a mixture, then take 1 part of acetic acid dihydrate in proportion by weight Cadmium + ammonium thiocyanate, dissolved in 100 parts of deionized water, stirred for 30min±5min to dissolve completely, then continued to add 0.5 parts of glacial acetic acid, continued to stir evenly for 10±5min, then poured into the hydrothermal reaction kettle, the filling degree was controlled 80% of the volume of the reaction kettle, then seal the hydrothermal reaction kettle, put it into a dry box, control the hydrothermal temperature at 200°C, and control the reaction time at 20h.

[0027] (2) Naturally cool to room temperature after the reaction finishes, the resulting product is repeatedly washed to neutrality with absolute ethanol, then suction filtered and dried to obtain CdS nano snowflake photocatalyst powder...

Embodiment 2

[0032] (1) Take cadmium acetate dihydrate and ammonium thiocyanate respectively according to the mass ratio range of 1:1 (cadmium acetate dihydrate: ammonium thiocyanate) to form a mixture, and then take 1 part of acetic acid dihydrate in proportion by weight Cadmium + ammonium thiocyanate, dissolved in 100 parts of deionized water, stirred for 30min±5min to dissolve completely, then continued to add 0.5 parts of glacial acetic acid, continued to stir evenly for 10±5min, then poured into the hydrothermal reaction kettle, the filling degree was controlled 50% of the volume of the reaction kettle, then seal the hydrothermal reaction kettle, put it into a dry box, control the hydrothermal temperature at 150°C, and control the reaction time at 10h.

[0033] (2) Naturally cool to room temperature after the reaction finishes, the resulting product is repeatedly washed to neutrality with absolute ethanol, then suction filtered and dried to obtain CdS nano snowflake photocatalyst powde...

Embodiment 3

[0035](1) Take cadmium acetate dihydrate and ammonium thiocyanate respectively in a ratio of 2:5 (cadmium acetate dihydrate:ammonium thiocyanate) by mass ratio to form a mixture, and then take 1.2 parts of dihydrate by weight Cadmium acetate + ammonium thiocyanate, dissolved in 100 parts of deionized water, stirred for 30min±5min to dissolve completely, then continued to add 0.7 parts of glacial acetic acid, continued to stir evenly for 10±5min, then poured into the hydrothermal reaction kettle, the filling degree Control the volume of the reaction kettle at 60%, then seal the hydrothermal reaction kettle, put it into a drying oven, control the hydrothermal temperature at 220°C, and control the reaction time at 15h.

[0036] (2) Naturally cool to room temperature after the reaction finishes, the resulting product is repeatedly washed to neutrality with absolute ethanol, then suction filtered and dried to obtain CdS nano snowflake photocatalyst powder;

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Abstract

The invention discloses a CdS nano-snowflake photocatalyst. The catalyst is of a hexagonal snowflake structure formed by six blade structures and has the diameter of 2-8 mu m; each blade structure is1-4 mu m long and 0.5-2 mu m wide; the main exposed crystal face of the structure is 002 side. The photocatalyst is prepared from cadmium acetate dihydrate and ammonium thiocyanate as main raw materials with a simple hydrothermal method. According to the photocatalyst, narrow-gap semiconductor CdS is combined with high-activity exposed face (002), so that photon absorption rate and migration ratecan be increased; under the action of illumination, carrier generation is facilitated, and photocatalytic reaction activity is improved by additionally produced carriers. Experiments prove that the catalyst has good catalytic performance for degradation of organic pollution models under sunlight (especially ultraviolet light and visible light), and has broad market application prospect.

Description

technical field [0001] The invention relates to a photocatalyst and its preparation method and application, in particular to a CdS nano-snowflake photocatalyst and its preparation method and application; it belongs to the technical field of nanomaterial photocatalysis. Background technique [0002] A photocatalyst is a substance that does not participate in the reaction itself and accelerates the photochemical reaction. Photocatalysis is the organic combination of photochemistry and catalyst. Under the background of environmental pollution and energy crisis, photocatalytic preparation of clean energy-hydrogen and degradation of organic pollutants is an efficient and green new technology developed in recent years. However, its research and development as a new functional material also faces many limitations, such as single catalytic performance, catalyst efficiency, deactivation and secondary pollution, and low utilization rate of sunlight (Li Zicheng, Yang Tao, Lu Lichen, Z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/02C02F1/30C02F101/30
CPCB01J27/04B01J35/004B01J35/02C02F1/30C02F2101/308C02F2305/10
Inventor 李海东张际云宋妍妍唐建国刘聚凯刘沙沙
Owner QINGDAO UNIV
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