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

A photocatalyst, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Simple operation and low cost effect

Inactive Publication Date: 2013-04-10
SHANGHAI NAT ENG RES CENT FORNANOTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 th...

Method used

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  • Ti&lt;3+&gt; and carbon codoped TiO2 photocatalyst with visible-light activity and preparation method of TiO2 photocatalyst
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  • Ti&lt;3+&gt; and carbon codoped TiO2 photocatalyst with visible-light activity and preparation method of TiO2 photocatalyst

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example 1

[0022] Weigh 0.5 g of P25 and place it in a vacuum tube furnace for vacuum calcination at different temperatures (the heating rate is 5°C / min). The sample is marked as: V-P25- n ( n =1, 2, 3, 4, 5 respectively represent the calcination temperature: 100°C, 200°C, 300°C, 400°C and 500°C).

[0023] 2): Ti 3+ Co-doped TiO with C 2 Preparation of photocatalyst

[0024] Mix 0.5 g P25 with 40 mL H 2 O. Mix a certain amount of absolute ethanol, stir magnetically for 2 hours, transfer to the polytetrafluoroethylene lining of the autoclave, and heat at 120°C for 3 hours. The sample was filtered and washed 3 times, and then placed in a vacuum oven at 60 °C for 12 h. After grinding, the obtained sample was vacuum activated at 300 °C for 3 h to obtain Ti 3+ Co-doped with carbon modified TiO 2 , the samples are marked as: V- n C-P25 (n=5, 10, 20, 30, 40 respectively represent the amount of ethanol added: 5, 10, 20, 30, 40 mL).

[0025] The photocatalytic activity evaluation metho...

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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 ...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J37/10
Inventor 何丹农刘睿张金龙邢明阳杨小龙金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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