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Preparation method of semiconductor compound photocatalyst capable of absorbing solar energy

A semiconductor, composite light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as energy shortage, environmental pollution, etc., to achieve charge transfer rate and charge transfer flux increase, The effect of promoting rapid separation and optimized utilization

Inactive Publication Date: 2012-01-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method for preparing a semiconductor composite photocatalyst capable of absorbing solar energy. The purpose is to fundamentally solve the problems of environmental pollution and energy shortage. Photocatalytic performance, discloses a method for preparing a semiconductor composite photocatalyst that can fully utilize solar energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0016] Configure 0.1mol / l ferrous sulfate solution and 0.2mol / l sodium carbonate solution for subsequent use. Add 4g of sodium dodecylbenzenesulfonate and 0.5g of silicone oil to 100ml of sodium carbonate solution, stir well for 20 minutes, then add 100ml of ferrous sulfate solution, and stir at high speed for about 1 hour to obtain a brown-red suspension. After static layering, decant the supernatant, filter with suction, wash the precipitate with deionized water and absolute ethanol, dry at 120°C to obtain hydroxide, and roast at 600°C for 1h to obtain Fe 2 o 3 semiconductor oxides.

[0017] Weigh 4.730g of BiCl 3 , add 0.03g of 6% hydrochloric acid to dissolve it, then add water to dilute to 80ml, slowly add excess Na 2 CO 3 Solution, until the pH value reaches 8, a white precipitate is formed, then suction filtered, washed with deionized water, dried at 80°C, calcined at 300°C for 3h, and ground to obtain Bi 2 o 3 semiconductor oxides.

[0018] Using thermal decompo...

Embodiment approach 2

[0022] The solar semiconductor composite photocatalyst was prepared by the co-precipitation method, and the analytically pure Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and SnCl 4 ·5H 2 O was mixed and dissolved in deionized water. At room temperature, PEG6000 was used as a dispersant, and 1:1 ammonia water was slowly added dropwise under stirring until it was completely converted into a precipitate, filtered, rinsed with deionized water, and the precipitate was placed in the Dry at 100°C to obtain the catalyst precursor, roast and grind at 500°C to obtain Bi 2 o 3 -Fe 2 o 3 -SnO 2 Solar semiconductor composite photocatalyst.

[0023] The solar semiconductor composite photocatalyst was obtained according to the preparation method of Embodiment 2, and 50ml, 10mg / l methyl orange aqueous solution was treated. The photocatalytic degradation conditions are as follows: 500W xenon lamp with cooling jacket is used as the light source, the air flow rate is 340ml / min, the solar...

Embodiment approach 3

[0025] Fe 2 o 3 The preparation of the semiconductor oxide is the same as the first embodiment.

[0026]Use analytical pure ammonia water and distilled water to prepare the ammonia solution of pH=12, then 19.5g analytical pure Bi(NO 3 ) 3 ·5H 2 O was dissolved in dilute nitric acid solution, and 1.6 g of Fe 2 o 3 Put the semiconductor oxide in it, and then, at room temperature, use PEG6000 as a dispersant, gradually titrate the above solution into the prepared ammonia solution, and at the same time, by controlling the stirring speed and titration speed, the resulting suspension is dispersed by ultrasonic waves In order to reduce agglomeration, the final precipitate was vacuum-dried, roasted and ground at 500°C to obtain Fe 2 o 3 / Bi 2 o 3 Semiconductor composite photocatalysts.

[0027] Weigh 1.753gSnCl 4 ·5H 2 Dissolve O in ice water, slowly add 5% ammonia water after stirring, adjust pH = 8, and obtain a white colloidal precipitate, continue stirring for 30 minut...

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Abstract

The invention relates to a preparation method of a semiconductor compound catalyst capable of absorbing solar energy, belonging to the technical field of environmental chemical engineering photocatalytic oxidation water treatment, and particularly disclosing a preparation method of a photocatalyst capable of utilizing ultraviolet light and visible light in the sunlight. The preparation method is characterized by comprising the following steps of: preparing three semiconductor oxide monomers A, B and C and a mixture containing two or three of A, B and C by utilizing any one technology of a conventional thermal decomposition method, a conventional sol-gel method or a conventional coprecipitation method, and mutually combining the semiconductor oxide monomers and the mixture to form the ternary-system solar semiconductor compound photocatalyst. In the invention, through the reasonable combination of multiple semiconductor oxide energy band structures with different band gaps (2.0-3.5eV),the ultraviolet light and the visible light in the sunlight are absorbed, and a multiphoton activation mechanism is formed. The invention is particularly suitable for treating tiny dysoxidizable organic matters in water, has high oxidizing efficiency and is green and environment friendly. The research is not reported before.

Description

technical field [0001] The invention discloses a method for preparing a semiconductor composite photocatalyst capable of absorbing solar energy, belonging to the technical field of environmental chemical photocatalytic oxidation water treatment. Specifically, it discloses a photocatalyst preparation method capable of utilizing ultraviolet and visible light in sunlight. Background technique [0002] TiO 2 It is favored for its high photocatalytic activity, stable chemical properties, non-toxicity, and low cost, and has received extensive attention in emerging environmental cleaning technologies. But TiO 2 The band gap is wide (3.2eV), and its excitation wavelength is 387.5nm, that is, it can only show photocatalytic activity in the ultraviolet region, while ultraviolet light (200-400nm) only accounts for 4-5% of solar energy, and visible light (400-800nm ) accounts for 45-50% of solar energy. In practice, due to the limitation of light window materials and simple molecular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/04B01J37/00B01J23/843B01J23/825C02F1/32C02F1/30C02F1/74
Inventor 樊彩梅王艳丁光月李双志王韵芳郝晓刚孙彦平
Owner TAIYUAN UNIV OF TECH
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