Visible-light response high energy efficiency photocatalyst prepared by composite activated carbon fiber (ACF) and application method

A photocatalytic reaction and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, energy and wastewater treatment, etc., can solve the problems of increased wastewater treatment cost, restricted application, low quantum yield, etc., and achieves repeated use. High efficiency, economical cost saving, high photocatalytic activity

Active Publication Date: 2012-07-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0004] Although photocatalytic technology has developed rapidly in the past ten years, it is still in the experimental research stage and has not reached industrialization.
The main reasons are as follows: (1) the band gap is wide, and it can only absorb ultraviolet and near-ultraviolet rays, which only account for about 3-5% of sunlight, and the utilization rate of sunlight is too low; (2) electron holes are easy to absorb. Recombination (low quantum yield), so that the catalytic efficiency is low, and it is impossible to realize industrialized treatment of wastewater
(3) Direct use of TiO 2 The powder will cause secondary pollution, increase the cost of wastewater treatment, and the current loading technology is immature, it is difficult to produce a high catalytic efficiency and strong bonded supported catalyst with the current loading method
These shortcomings seriously restrict the application of this technology in practice

Method used

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  • Visible-light response high energy efficiency photocatalyst prepared by composite activated carbon fiber (ACF) and application method
  • Visible-light response high energy efficiency photocatalyst prepared by composite activated carbon fiber (ACF) and application method
  • Visible-light response high energy efficiency photocatalyst prepared by composite activated carbon fiber (ACF) and application method

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Experimental program
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specific Embodiment approach

[0034] The preparation method of the novel composite photocatalyst is as follows:

[0035] (1) Add 0.10 mol of tetra-n-butyl titanate to 60.0 mL of absolute ethanol at room temperature, and stir for 30 minutes to obtain a uniform and transparent yellow solution A;

[0036] (2) Fully mix 56.64 mL of absolute ethanol, 40 mL of glacial acetic acid, and 14.40 mL of distilled water at room temperature, and then add 0.044 g of Sm(NO 3 ) 3 ·6H 2 O and 1.14g CH 4 N 2 Stir and dissolve the S crystals to form a solution B, which is stored in a separatory funnel for subsequent use;

[0037] (3) Under the conditions of magnetic stirring and constant temperature of 30°C, slowly add solution B dropwise to solution A to obtain a uniform and transparent sol, and age it at room temperature for 24 hours for later use;

[0038] (4) Cut the activated carbon fibers activated by water vapor at 850°C for 30 minutes into long squares, immerse them in the prepared sol, and dry them in a vacuum dr...

Embodiment 1

[0045] Example 1: the S 6+ 、Sm 3+ Co-doped nano TiO 2 ACF-loaded precursor (S 6+ 、Sm 3+ The doping amounts are 15.0 mol% and 0.1 mol%, respectively) were calcined in a tubular muffle furnace at 500° C. for 2 h, and nitrogen gas was continuously fed during the calcining process to obtain a high-efficiency composite photocatalyst. Get this catalyst 7.5g (4 pieces) and hang in the reaction flask of 500mL with the form of uniform symmetry, then add the Rhodamine B solution 500mL that initial concentration is 40mg / L in the reaction flask. The light source is a 500W high-pressure mercury lamp. After 8 minutes of light reaction, the decolorization rate of rhodamine B reached 100%, and it was completely degraded.

Embodiment 2

[0046] Embodiment 2: the catalyst among the example 1 is used for the methylene blue solution 500mL that initial concentration is 40mg / L. The light source is a 500W high-pressure mercury lamp. After 9 minutes of light reaction, the decolorization rate of methylene blue reached 100%, and it was completely degraded.

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Abstract

The invention discloses a visible-light response high energy efficiency photocatalyst prepared by composite activated carbon fiber (ACF) and an application method, which use tetrabutyl titanate as presoma of titanium dioxide, use absolute ethyl alcohol as solvents, use glacial acetic acid as hydrolysis inhibitor, and use activated carbon fiber as a carrier. Firstly, ions of S and Sm are used for dopping TiO2 and are loaded on the ACF carrier large in specific surface area to obtain a novel composite photochemical catalyst, therefore, a new development trend is pointed for industrial waste water treatment. The preparation method is simple, production can be performed at normal temperature, and industrialization can be achieved conveniently. The photocatalyst is high in catalytic activity, and low-concentration organic pollution in water can be reduced in a short time. Simultaneously, high-concentration and deep-dye wastewater can be degraded in a short time. The problem that suspending catalyst is apt to reunite and can cause secondary pollution and the like is solved, and the catalyst is easy to recover. Ratio of repetitive cycle utilization is high, high photocatalysis effect can be maintained after multiple repetitive cycle utilization, and economic cost can be saved. Activity of visible light is high, and under stimulation of visible light, low-concentration organic pollution can be decomposed fast, and high-concentration organic pollution can be decomposed fast. A foundation is laid for actual industrial application of the photocatalyst.

Description

technical field [0001] The invention belongs to a preparation method and application of a novel high-energy-efficiency visible light-responsive composite photocatalyst material, in particular to a preparation method and application of a high-efficiency composite photocatalyst for removing low-concentration and high-concentration organic pollutants in water. Background technique [0002] In recent years, with the rapid development of my country's economy and the improvement of people's living standards, a large number of toxic and harmful refractory pollutants such as drugs, pesticides, dyes, surfactants, heavy metals and nitrite have entered the environment, especially rivers, rivers and lakes. , sea, leading to the decline of water quality and the occurrence of chemical water pollution incidents. Wastewater contains a large amount of organic pollutants, which seriously threaten human health and life. Among them, dye wastewater occupies a considerable proportion. Due to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/32
CPCY02W10/37
Inventor 郑经堂刘倩江波吴明铂仇实刘萌萌袁建军谭明慧孙冠华肖慧吉魏振兴朱海云朱朝胜
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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