Visible-light response type photocatalyst and preparation method thereof

A photocatalyst, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reduced catalytic activity, unstable performance, etc., achieving low synthesis temperature, simple preparation process, short time effect

Inactive Publication Date: 2013-01-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since CdS is prone to photocorrosion during the illumination process, it is unstable, and the catalytic activity gradually decreases with the extension of the illumination time.

Method used

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  • Visible-light response type photocatalyst and preparation method thereof
  • Visible-light response type photocatalyst and preparation method thereof
  • Visible-light response type photocatalyst and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing a visible light-responsive photocatalyst, comprising the following steps:

[0027] (A) fully mixing soluble calcium salt, soluble indium salt, thioacetamide and deionized water to obtain a mixed solution;

[0028] (B) subjecting the mixed solution described in step (A) to a hydrothermal reaction under heating conditions, and after filtering and drying, a powder is obtained;

[0029] (C) Under the condition of isolating oxygen, the powder described in the step (B) is heat-treated, and after heat preservation, a visible light-responsive photocatalyst is obtained.

[0030] In the present invention, soluble calcium salt, soluble indium salt, thioacetamide and deionized water are used as reactants, the soluble calcium salt is preferably calcium nitrate, and the soluble indium salt is preferably indium nitrate. The molar ratio of the soluble calcium salt to the soluble indium salt is preferably 1:2, and the molar rat...

Embodiment 1

[0039] Weigh 2.362 grams of calcium nitrate (Ca(NO 3 ) 2 4H 2 O), 7.638 grams of indium nitrate (In(NO 3 ) 3 9 / 2H 2 O), 6.005 grams of thioacetamide (H 3 CCSNH 2 ), were added to 250 ml beakers respectively, then added deionized water to 150 ml, stirred for 30 minutes, made to mix evenly, and formed a transparent solution;

[0040] The above solution is transferred to the liner of a 200 ml stainless steel reactor, the volume of the solution accounts for 75% of the volume of the reactor, the reactor is sealed, and then the reactor is placed in an oven at 160°C for 16 hours;

[0041] The reacted suspension was taken out, slowly transferred to a Buchner funnel, and deionized water and absolute ethanol (C 2 h 6 O) washing 3 times respectively, and then placing the washed powder in an oven at 120° C. for 12 hours;

[0042] The above dried powder was placed in a reaction furnace, and in an argon (Ar) atmosphere, the temperature of the reaction furnace was slowly raised to 600...

Embodiment 2

[0048] Weigh 1.181 grams of calcium nitrate (Ca(NO 3 ) 2 4H 2 O), 3.819 grams of indium nitrate (In(NO 3 ) 3 9 / 2H 2 O), 3.002 grams of thioacetamide (H 3 CCSNH 2 ) into a 100 ml beaker, then add deionized water to 80 ml, stir for 60 minutes, make it mix evenly, and form a transparent solution;

[0049] Transfer the above-mentioned homogeneously mixed solution to the liner of a 100 ml stainless steel reactor, the volume of the solution accounts for 80% of the volume of the reactor, seal the reactor, and then place the reactor in an oven at 140°C for 24 hours;

[0050] The reacted suspension was taken out, slowly transferred to a Buchner funnel, and deionized water and absolute ethanol (C 2 h 6 O) washing 4 times respectively, and then placing the washed powder in an oven at 100° C. for 16 hours;

[0051] Put the above-mentioned dried powder in a reaction furnace, raise the temperature of the reaction furnace to 700°C at a rate of 4°C / min in a helium (He) atmosphere, an...

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Abstract

The invention provides visible-light response type photocatalyst, which has a chemical formula of CaIn2S4. The preparation method comprises the following steps of: fully mixing soluble calcium salt, soluble indium salt, thiacetamide and de-ionized water to obtain mixed solution; carrying out hydrothermal reaction to the mixed solution under the heating condition; filtering and drying to obtain powder; under the oxygen isolation condition, heating the powder; and after the temperature is kept, obtaining the visible-light response type photocatalyst. The visible-light response type photocatalyst prepared by the invention has a strong light adsorption capacity in the visible optical band, and organic dye can be effectively degraded under the visible light condition. The structure and the catalytic stability of the visible-light response type photocatalyst are high, the structure of the visible-light response type photocatalyst is not changed along with time extension, and the catalytic stability of the visible-light response type photocatalyst still can be kept at a high level. In addition, a hydrothermal reaction method is adopted by the visible-light response type photocatalyst, raw materials can be evenly mixed in a molecular level, and the visible-light response type photocatalyst has the advantages of low synthesis temperature, low impurity content, simple preparation technology, short time and low cost.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a visible light responsive photocatalyst and a preparation method thereof. Background technique [0002] Since Fujishima and Honda in 1972 in the n-type semiconductor TiO 2 Since the photolysis of water was discovered on single crystal electrodes, photocatalytic reactions have attracted widespread attention in environmental governance and energy development. It can convert low-density solar energy into high-density chemical energy and electrical energy. At the same time, it can directly use low-density solar energy to split water to produce hydrogen, degrade and mineralize various organic pollutants in water and air, and even reduce heavy metal ions. This technology has the advantages of reaction at room temperature, direct use of solar energy, and no secondary pollution. It has immeasurable significance for fundamentally solving the problems of environmental pollution and energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/10C02F1/30
Inventor 高琛丁建军鲍骏孙松
Owner UNIV OF SCI & TECH OF CHINA
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