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TiO2 powder with visible light catalytic activity and preparation method thereof

A catalytic activity and visible light technology, applied in the field of material science, can solve the problems of low powder purity, poor dispersion, complex equipment and process, etc., and achieve simple process, low preparation cost, good social and economic benefits Effect

Inactive Publication Date: 2012-06-27
东北大学秦皇岛分校
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]At present, the methods for preparing TiO2 powder mainly include liquid phase deposition, chemical vapor deposition and magnetron sputtering, etc. , but the TiO2 photocatalysts prepared by these methods only have good photocatalytic activity under ultraviolet light, but basically have no photocatalytic effect under visible light, and the equipment and process of these methods are complicated , the temperature required by the process is high, the purity of the prepared TiO2 powder is not high, and the dispersion is not good

Method used

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  • TiO2 powder with visible light catalytic activity and preparation method thereof
  • TiO2 powder with visible light catalytic activity and preparation method thereof
  • TiO2 powder with visible light catalytic activity and preparation method thereof

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Effect test

Embodiment 1

[0032] (1) Preparation of precursor solution A: Add 5ml of tetra-n-butyl titanate dropwise to 20ml of absolute ethanol while stirring, then drop 3ml of glacial acetic acid, after 20 minutes of stirring, a uniform and transparent light yellow solution is obtained, which is the precursor Liquid A;

[0033] (2) Preparation of dripping solution B: A solution of 5ml twice distilled water and 10ml of absolute ethanol, adjust the solution pH=2 with hydrochloric acid, and stir for 20min to obtain dripping solution B;

[0034] (3) Preparation of TiO 2 Wet sol: Add the dropping solution B to the precursor solution A dropwise, and stir in a water bath at a constant temperature of 50℃ for 4 hours to obtain a uniform and transparent light yellow TiO 2 Wet sol, stand for use after 15 hours;

[0035] (4) Preparation of TiO 2 Dry gel: TiO 2 The wet sol is dried in a vacuum drying oven at 60°C for 72 hours to obtain TiO 2 Xerogel

[0036] (5) Preparation of TiO 2 Powder: TiO 2 After the dry gel is gro...

Embodiment 2

[0045] (1) Add 10ml of tetra-n-butyl titanate dropwise to 12ml of absolute ethanol while stirring, then add 7ml of glacial acetic acid, and after 30min of stirring, a uniform and transparent light yellow solution, precursor A, is obtained;

[0046] (2) Preparation of dripping solution B: Mix 10ml of double-distilled water and 8ml of absolute ethanol into a solution, adjust the solution pH=2 with hydrochloric acid, and stir for 20min to obtain dripping solution B;

[0047] (3) Preparation of TiO 2 Wet sol: Add the dropping solution B dropwise to the step precursor A, and stir for 2 hours at a constant temperature of 70°C in a water bath to obtain a uniform and transparent light yellow TiO 2 Wet sol, stand for use after 15 hours;

[0048] (4) Preparation of TiO 2 Dry gel: TiO 2 The wet sol is dried in a vacuum drying oven at 70℃ for 60 hours to obtain TiO 2 Xerogel

[0049] (5) Preparation of TiO 2 Powder: TiO 2 After the dry gel is ground, it is calcined at 500°C under oxidizing atmosph...

Embodiment 3

[0054] (1) Preparation of precursor solution A: Add 15ml of tetra-n-butyl titanate dropwise to 12ml of absolute ethanol while stirring, then drop 3ml of glacial acetic acid, after 50 minutes of stirring, a uniform and transparent light yellow solution is obtained, which is the precursor Liquid A;

[0055] (2) Preparation of dripping solution B: Mix 20ml of double distilled water and 8ml of absolute ethanol into a solution, adjust the pH of the solution to 3 with hydrochloric acid, and stir for 30 minutes to obtain dripping solution B;

[0056] (3) Preparation of TiO 2 Wet sol: Add dropwise solution B to precursor solution A, and stir for 3 hours at a constant temperature of 60℃ in a water bath to obtain uniform and transparent light yellow TiO 2 Wet sol, stand for use after 15 hours;

[0057] (4) Preparation of TiO 2 Dry gel: TiO 2 The wet sol is dried in a vacuum drying oven at 80°C for 24 hours to obtain TiO 2 Xerogel

[0058] (5) Preparation of TiO 2 Powder: TiO 2 After the dry gel...

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Abstract

The invention belongs to the field of material science and specifically relates to a TiO2 powder with visible light catalytic activity and a preparation method thereof. The TiO2 powder of the invention contains crystal phases of: 90-100 wt% of anatase (TiO2), and 0-10 wt% of rutile (TiO2). The preparation process comprises main points of: preparing a forerunner liquid A from tetra-n-butyl titanate, absolute ethyl alcohol and glacial acetic acid; preparing secondary distilled water and absolute ethyl alcohol into a solution; adding hydrochloric acid and adjusting a pH value to 1-5; preparing a dropping solution B; adding the dropping solution B into the forerunner liquid A; carrying out isothermal stirring in a water-bath; carrying out stewing for a while, drying, grinding and calcining to obtain the TiO2 powder with high photocatalytic activity. The TiO2 powder of the invention has strong light absorption and photoresponse in wide spectrum scope namely under ultraviolet light and visible light irradiation and has visible light catalytic activity; and the method has advantages of simple preparation technology, low-cost equipment and easily controlled reaction process.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a TiO with visible light catalytic activity 2 Powder and its preparation method. Background technique [0002] TiO 2 It is an important functional material with broad application prospects. It has unique functions such as good photocatalytic activity, corrosion resistance, strong ultraviolet shielding ability and electrochromic property. It has been widely used in photocatalysis and other fields. TiO 2 It can be used as a photocatalyst to treat sewage, and it can degrade more than 3000 kinds of refractory organic compounds under the condition of ultraviolet radiation. The increase in the degree of industrialization in my country in recent decades has led to aggravation of water pollution, which has brought great threats to the ecological environment and even people's health. The country has also increased investment in anti-pollution while formulating pollution discharge stand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 雷雪飞薛向欣夏小倩
Owner 东北大学秦皇岛分校
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