Visible light responsive photocatalyst Li3ZnBi5O10 and preparation method thereof

Abstract

The invention discloses a visible light responsive photocatalyst Li3ZnBi5O10 and a preparation method thereof. The chemical composition formula of the photocatalyst is Li3ZnBi5O10. The preparation method includes: (1) weighing and burdening 99.9% analytically pure chemical raw materials Li2CO3, ZnO and Bi2O3 according to the chemical formula Li3ZnBi5O10; (2) mixing the well proportioned raw materials of step (1), putting the mixture into a ball milling tank, adding zirconia balls and anhydrous ethanol, conducting ball-milling for 8h, carrying out mixing levigating, taking the mixture out, performing drying, and conducting sieving by a 200-mesh sieve; and (3) presintering the evenly mixed powder of step (2) at 700-750DEG C, and conducting heat preservation for 6h, performing natural cooling to room temperature, then decreasing the particle diameter to less than 2 micrometers by ball mill crushing, thus obtaining the Li3ZnBi5O10 powder. The preparation method provided by the invention is simple and low in cost, the prepared photocatalyst has excellent catalytic performance, can decompose harmful chemical substances under visible light irradiation, and also has good stability, thus having good application prospect.

Description

technical field [0001] The invention relates to a photocatalyst Li with visible light response 3 ZnB 5 o 10 The invention and a preparation method thereof belong to the field of inorganic photocatalytic materials. Background technique [0002] With the development of social economy, people pay more and more attention to energy and ecological environment. Solving the problems of energy shortage and environmental pollution is an urgent need to achieve sustainable development, improve people's quality of life and ensure national security. [0003] Since the late 1970s, people have proposed the use of photocatalysts to decompose organic substances such as pesticides and odorous substances in water and the atmosphere, and self-cleaning of solid surfaces coated with photocatalysts. The principle of photocatalytic reaction is that after the photocatalyst absorbs photons higher than its bandgap energy, holes and electrons are generated, and these holes and electrons undergo oxida...

AI Technical Summary

Problems solved by technology

For example, niobate photocatalyst Pb 3 Nb 4 o 13 、BiNbO 4 and Bi 2 MbO 7 (M=Al, Ga, In, Y, rare earth elements and Fe) etc. and niobium potassium composite oxide photocatalysts such as KNbO 3 , KNb 3 o 8 、K 4 Nb 6 o 17 and K 6 Nb 10.6 o 30 have good photocatalytic performance, but their intrinsic photocatalytic effect is weak or inactive in the visible light range.

[0005] Although photocatalysis research has been carried out for several years, most of the exploration and development of visible light-responsive photocatalysts are based on experience summaries obtained through a large number of experiments. Predict its photocatalytic performance in nature, so the types of photocatalysts with visible light response reported are still very limited, and there are problems such as low photoconversion efficiency, difficult synthesis, poor stability and narrow spectral response range, research and development of new preparations High-efficiency photocatalysts with simple methods and broad-band visible light response are difficult problems that scientists in the field have been eager to solve but have always been difficult to achieve, which largely limits the wide application and development of photocatalysts.