Ti<3+> and carbon codoped TiO2 photocatalyst with visible-light activity and preparation method of TiO2 photocatalyst

Abstract

The invention relates to a Ti<3+> and carbon codoped TiO2 photocatalyst with visible-light activity and a preparation method of the TiO2 photocatalyst. The structure of the catalyst is: partial Ti<4+> in TiO2 bulk phase lattice is reduced to Ti<3+> (the self doping amount of Ti<3+> is about 0.01at% to 0.3at%); and at the same time, ethanol is bonded on the surface of TiO2 in the form of graphite (the mass percentage between the carbon and TiO2 is 80.43% to 97.04%). Various characterization means find that the carbon doping is mainly compounded on the surface of TiO2 in the form of graphite and bonded on the surface of TiO2 in the way of Ti-O-C. The catalyst coproduced and modified by Ti<3+> and the carbon shows high activity of visible light degraded methyl orange. The doping level formed by Ti<3+> and oxygen vacancy can improve the response range of TiO2 to the visible light, and the graphite compounded on the surface of the catalyst can improve the migration efficiency of photogenerated electrons and confirm that the cooperation between Ti<3+> and the graphite carbon on the surface can promote the visible light catalytic activity of the catalyst to be improved. The preparation method is relatively simple in operation and readily available in raw materials, and the prepared modified photocatalyst is strong in function.

Description

technical field [0001] The present invention relates to a kind of TiO 2 Photocatalyst and its preparation method. In particular, a visible-light active Ti 3+ Co-doped TiO with carbon 2 Photocatalyst and its preparation method. Background technique [0002] In recent years, on Ti 3+ Modified TiO 2 and reduced TiO 2 The study of surface oxygen defects has attracted more and more attention. Due to TiO 2 The surface morphology is closely related to the performance of the catalyst, so regarding TiO 2 The study of surface properties has always been a research hotspot. The research on surface defect sites is one of the research hotspots in surface chemistry. Sasikala et al. found that TiO 2 -SnO 2 There is a large amount of Ti on the surface of the composite photocatalyst 3+ and oxygen vacancies, which may be responsible for the catalyst's absorption in the visible region. Lu et al adopted the method of vacuum high temperature calcination, in TiO 2 A large number of ...

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Problems solved by technology

[0003] However, the preparation process of the traditional doping method is relatively complicated and the equipment cost and production cost are too high, which seriously restricts its industrialization

In addition, doping modified TiO 2 A common problem is that under ultraviolet light, the introduction of doping elements will generate more photogenerated electron and hole recombination centers. Although the visible light activity of the catalyst after doping is improved, its ultraviolet light activity is greatly reduced.

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