Visible-light catalyst for degrading rhodamine B in water and application of catalyst

Abstract

The invention discloses a visible-light catalyst for degrading rhodamine B in water. The chemical formula of the visible-light catalyst is shown as [Cu12(1, 2, 4-triazole)8(H2O)2][alpha-SiW12O40].2H2O. The visible-light catalyst is a compound consisting of a metal-organic framework constructed based on a polyoxometallate structure and a three-dimentional framework structure. Four types of Cu ions which are independent on the crystallography exist in the compound; the Cu ions are mutually connected with a ligand 1, 2, 4-triazole to form a two-dimensional bicycle positive ion framework structure with co-existing of a ternary ring and a deca-membered ring; [alpha-SiW12O40]<4-> negative ions are respectively connected to three copper ions on the two-dimensional dual rings through end group oxygen atoms to form the three-dimentional framework structure. The visible-light catalyst has the advantages of simple preparation method and excellent water stability and can be recycled after degrading; the visible light catalyst is used for degrading the rhodamine B in water by using the light catalyst, so that the solar energy can be fully used. The visible-light catalyst is simple in process, low in cost and excellent in catalytic effect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a visible light catalyst for degrading rhodamine B in water and an application thereof. Background technique [0002] In recent years, photocatalysis has become an ideal environmental pollution control technology and clean energy production technology because of its unique properties such as direct use of solar energy as a light source to drive reactions. It has less secondary pollution, mild reaction conditions, easy operation, and energy efficiency. Advantages of low consumption. The key element of the photocatalytic reaction is the photocatalyst. Titanium dioxide as a common photocatalyst has been known as early as the 1950s. Since 1972, Japanese scientist Fujishima Akira published a report on the photolysis of water on a titanium dioxide electrode to produce hydrogen in Nature, which immediately attracted international attention. At the same time, scholars in the fi...

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Problems solved by technology

Titanium dioxide as a common photocatalyst has been known as early as the 1950s. Since 1972, Japanese scientist Fujishima Akira published a report on the photolysis of water on a titanium dioxide electrode to produce hydrogen in Nature, which immediately attracted international attention. At the same time, scholars in the fields of chemistry, physics, and materials have paid extensive attention to the decomposition of organic matter by photocatalytic oxidation of titanium dioxide. Although TiO 2 It has the advantages of high stability, high activity, reusability and low cost, but this kind of research has not been widely used in the end. The main reason is that the band gap of titanium dioxide is large (3.2 eV), which is equivalent to only wavelengths smaller than Or equal to 387 nm ultraviolet light to excite TiO 2 Generate conduction band electrons and valence band holes to oxidize and decompose organic matter

However, the photoresponse range is still limited (mainly in the ultraviolet region), which limits its application

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