Co0.8Ni0.2TaO6 photocatalyst with visible light response and preparation method and application of Co0.8Ni0.2TaO6 photocatalyst

Abstract

The invention provides a Co0.8Ni0.2TaO6 photocatalyst with a visible light response. The microstructure of the photocatalyst is porous micro/nano spheres of which the particle sizes are 5-10nm; and the diameters of the porous micro/nano spheres are 0.5-2 microns. The photocatalyst is prepared through sol-gel reaction, spray drying and burning of tantalum chloride, nickel acetate and cobalt nitrate as main reaction materials according to the stoichiometric ratio of a nickel element, a cobalt element and a tantalum element in the Co0.8Ni0.2TaO6. The preparation method is simple in preparation process, relatively low in cost, low in energy consumption; and the prepared photocatalyst has a good catalytic effect, has relatively high catalytic water decomposition efficiency under visible light radiation, and has potential application prospect in the field of hydrogen production from photocatalytic water splitting and water treatment.

Description

technical field [0001] The present invention relates to a Co with visible light response 0.8 Ni 0.2 Ta 2 o 6 The photocatalyst and its preparation method and application belong to the field of inorganic photocatalytic materials. Background technique [0002] With the depletion of fossil energy such as oil and natural gas, the problem of global environmental pollution is becoming more and more serious. New energy development and environmental pollution control have become hot topics in current scientific research. People urgently need to develop new energy and low-cost green environmental pollutants. Treatment technology, and photocatalytic materials have shown broad application prospects in the fields of photolysis of water to produce hydrogen to develop new energy and sewage treatment. Among all kinds of photocatalysts for water splitting, perovskite semiconductor tantalate is the most efficient one, because the special energy band structure of tantalate is more likely ...

AI Technical Summary

Problems solved by technology

[0004] As another example, Chinese patent document CN1544144A discloses a photocatalyst responsive to visible light and its application; the photocatalyst of this invention is a compound oxide semiconductor formed by indium, 5A element in the periodic table of elements and transition metal element M, and its chemical formula is In 1-x m x AO 4 (A: 5A element, M: transition metal element), where the sum of the moles of indium and M is equal to the moles of A, the photocatalyst prepared by this invention can decompose harmful Hydrogen production from chemicals and water splitting, but at a lower rate

At the same time, there are also literature reports based on Ta 2 o 5 、 Bi 2 o 3 , CuO as raw materials, mixed evenly and ground into tablets (the raw materials need to be pretreated before use: Ta 2 o 5 Calcined at 600°C for 8h, Bi 2 o 3 Calcined at 800°C for 8h), and prepared by solid-state reaction at 1100°C for 48h to obtain BiTa 1-x Cu x o 4 (x=0-0.04) photocatalyst, the prepared photocatalyst can decompose water to produce hydrogen under visible light irradiation, but the hydrogen production rate is very low (International Journal of HydrogenEnergy 2009,34,3631)

[0005] In summary, most of the existing preparation methods of doped tantalate photocatalysts use methods such as ball milling, hydrothermal or high-temperature long-term calcination, which require high preparation conditions, cumbersome steps, high cost, and visible light catalysis The efficiency of water splitting needs to be improved

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