Preparing method for visible light response CdS/ (cal-Ta2O5-SiO2) composite photocatalyst

A cal-ta2o5-sio2, catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of small specific surface area of ​​raw materials, insufficient stability, and easy destruction of mesopores, etc. Achieve the effects of more active sites, slower recombination speed, and increased photocatalytic activity
CN107537518AActive Publication Date: 2018-01-05NANKAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANKAI UNIV
Publication Date
2018-01-05

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Abstract

The invention relates to a preparing method for a visible light response CdS / (cal-Ta2O5-SiO2) composite photocatalyst. The method includes the steps of dissolving tantalum chloride in an ethanol water solution, adjusting pH to be equal to 4-6 with citric acid, adding silicon balls to stir for 3-8 h, conducting centrifugal separation, drying at 80 DEG C, roasting for 2 h at 400-600 DEG C to obtaina sample, and repeating the above steps by 3 times to obtain a Cal-Ta2O5-SiO2 sample; immersing the sample into 0.2 M Cd (AC) 2 solution for 2-3 min, immersing the sample into 50-80 ml of 0.2 M Na2Ssolution for 2-3 min, centrifuging, and washing; putting into a drying oven at 80 DEG C for drying for 12-16 h; repeating in this way, and finally obtaining the sample which is named as CdS / (cal-Ta2O5-SiO2). The preparing method is novel, precursors are low in cost and uniform in size, and moreover, the CdS / (cal-Ta2O5-SiO2) composite photocatalyst has high photocatalytic activity, a long catalytic life, and a potential industrial application value.
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Description

technical field

[0001] The invention relates to a CdS / (cal-Ta 2 o 5 -SiO 2 ) preparation method of composite photocatalyst. Background technique

[0002] Tantalum pentoxide is a promising photocatalyst in dye degradation and photolysis of water. Compared with other photocatalytic materials, tantalum pentoxide has significant advantages such as high chemical stability, high photocatalytic efficiency, environmental friendliness, high piezoelectric constant and high refractive index. Compared with titanium dioxide, tantalum pentoxide has a more negative 5d orbital than Ti 3d orbital, and its redox ability is stronger. Its oxides and salts have received extensive attention and research. In recent years, tantalum pentoxide-based photocatalysts have also been gradually applied in photocatalytic reactions. However, since the band gap of tantalum pentoxide is 3.9-4.0eV, this band gap can only be excited by ultraviolet light. And pure ultraviolet light only accounts for 4-5% of...

Claims

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