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Application of polyoxometallate containing Keplerate in carrying out heterogeneous photocatalytic degradation on rhodamine B

A polyoxometalate and heterogeneous catalyst technology, applied in the field of catalysis, can solve the problems of catalyst recovery, separation and recycling difficulties, and achieve the effects of easy raw materials, high catalytic efficiency, and easy recycling

Inactive Publication Date: 2012-12-12
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

Polyoxymetallic salts (polyacids), which are widely used in the field of catalysis, also have a role in the field of photocatalysis, but they are mostly carried out in the form of homogeneous catalysis, which brings great difficulties to the recovery, separation and recycling of catalysts.

Method used

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  • Application of polyoxometallate containing Keplerate in carrying out heterogeneous photocatalytic degradation on rhodamine B

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Embodiment 1

[0015] The nitrogen-containing organic dye rhodamine B is formulated into an aqueous solution to be degraded, with a concentration of 2 mg / L, and the initial pH of the aqueous solution is adjusted to 3, and a tetrabutylammonium salt catalyst of Keplerate type polyoxometalates is added to make the concentration 2 mg / 50 ml. The solution is irradiated under ultraviolet light and stirred rapidly to carry out catalytic degradation. The ultraviolet diagram of its catalytic degradation is shown in figure 1 .

[0016] Within the initial pH3-5 of the solution, the degradation rate and degradation ratio of rhodamine B increased as the pH decreased. The degradation rate reached the highest when the pH was 3.5 and 4.0. When the pH was 3.5, Rhodamine B even degraded to 0 within six hours. At other pH values, the degradation rate could not always reach 100%. Select pH to be 3.5 and 4.0, adjust the amount of catalyst to catalyze, the results show that when the amount of catalyst increases f...

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Abstract

The invention discloses an application of polyoxometallate containing Keplerate in carrying out heterogeneous photocatalytic degradation on rhodamine B; and the polyoxometallate containing Keplerate is used for solving the problem that a catalyst in the homogeneous catalytic degradation of a water-soluble nitrogenous dye is hard to recycle, separate and cycle, and belongs to the catalysis field. A tetrabutyl ammonium salt (NH4)18[(C16H36N)4N]24[Mo132O372(H2O)72(CH3COO)30].ca.7NH4CH3COO.ca.173H2O of a Keplerate-type polyoxometallate is used as an out-phase catalyst to perform the photocatalytic degradation on rhodamine B. The heterogeneous photocatalytic degradation is high in catalysis efficiency, and easy to recycle.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to an organic-inorganic composite polyoxometalate compound and its heterogeneous photocatalytic degradation of nitrogen-containing dyes. Background technique [0002] Dyestuff, as a chemical product widely used in industry, has an annual global output of more than one million tons. And more than half of them are nitrogen-containing dyes. These dyes not only contain potential carcinogenic risks, but also their degradation products seriously pollute the environment. It is precisely because of the non-biodegradable, toxic and non-fading properties of dyes that it is especially important to find ways to break down these chemicals. Unlike traditional nitrogen-containing dye decolorization methods such as activated carbon adsorption or biodegradation, it is now usually carried out by destroying nitrogen bonds. Commonly used methods include electrolysis, chemical degradation, and even...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/176B01J31/34A62D101/28
Inventor 周云山熊添张立娟
Owner BEIJING UNIV OF CHEM TECH
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