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Preparation method and application of heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of limited solar energy utilization, low photocatalytic activity, The degradation effect is not high, and the effect of excellent photocatalytic activity, simple process operation and low cost is achieved

Active Publication Date: 2016-04-06
JIANGSU UNIV
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Problems solved by technology

[0002] In recent years, the development and utilization of green and non-polluting solar energy to solve the increasing environmental pollution and energy crisis has been a research hotspot, and semiconductor photocatalysis technology can maximize the use of solar energy to achieve sewage purification and energy conversion. Semiconductor photocatalysis technology It uses electron-hole pairs with high redox ability generated by semiconductor photocatalyst materials under light to realize the degradation and removal of organic pollutants. This technology is due to the complete degradation of organic pollutants, energy saving, high efficiency, and small secondary pollution and other advantages have been developed rapidly. At present, more semiconductor photocatalysts have been studied, such as: TiO 2 , SrTiO 3 Photocatalyst materials with high activity such as photocatalysts can only respond to ultraviolet light, which accounts for only 5% of the total incident sunlight, which greatly limits the utilization of solar energy. Therefore, the development of new and efficient visible light catalysts is currently a hot spot in photocatalytic technology
[0003] Indium vanadate (InVO 4 ) is a new visible light responsive semiconductor photocatalyst with a bandgap width of about 2.0eV, which can be excited by visible light and generate electrons with high redox ability in its conduction band (CB) and valence band (VB) respectively- Hole pairs, to achieve effective degradation of organic pollutants, currently, InVO 4 Most of them are synthesized by hydrothermal method, sol-gel method and high-temperature solid-phase calcination method, and the obtained products have large particle size and irregular shape, which makes InVO 4 The photocatalytic activity is not high, therefore, we synthesized InVO with smaller particle size and regular shape by microwave-assisted synthesis 4 Nanoparticles
[0004] Cadmium sulfide (CdS) is an important metal sulfide with a bandgap width of 2.4eV, which can respond well to visible light, but the degradation effect of single CdS on pollutants is not high, mainly due to the electron-space generated under light. Hole pairs are very easy to recombine. At present, using different semiconductor materials to recombine with CdS to construct a heterojunction can effectively promote the separation of electron-hole pairs at the interface and achieve the purpose of improving photocatalytic activity. For example: CdS / WO 3 , CdS / Bi 2 MoO 6 and CdS / BiPO 4 Heterojunction photocatalysts can significantly improve the photocatalytic activity of CdS, but so far, no preparation of InVO by hydrothermal method has been found. 4 / CdS Heterojunction Photocatalyst and Its Photocatalytic Application Report

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  • Preparation method and application of heterojunction photocatalyst
  • Preparation method and application of heterojunction photocatalyst
  • Preparation method and application of heterojunction photocatalyst

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Embodiment 1

[0028] Step (1): Weigh 1mmol indium nitrate (0.382g) and 1mmol ammonium metavanadate (0.117g) and dissolve them in 100mL pure water, heat and dissolve to obtain a yellow precursor suspension, then transfer to a 250mL three-necked flask, microwave React at 800W, 100°C, 5h, and finally wash with water, filter and dry to obtain indium vanadate A. Step (2): Weigh 1mmol of cadmium acetate (0.266g) and 2mmol of thiourea (0.076g) and dissolve them in 40mL of pure water, ultrasonically disperse to obtain a transparent solution, then transfer to a 50mL hydrothermal kettle, and conduct a hydrothermal reaction at 160°C , 24h, finally washed with water, filtered and dried to obtain cadmium sulfide B.

[0029] Step (3): Dissolve 0.015g of indium vanadate A, 1mmol of cadmium acetate (0.266g) and 2mmol of thiourea (0.076g) in 40mL of pure water, and ultrasonically disperse to obtain a light yellow precursor suspension, which is then transferred to 50mL In a hydrothermal kettle, the hydrothe...

Embodiment 2

[0031] Step (1): Weigh 1mmol indium nitrate (0.382g) and 1mmol ammonium metavanadate (0.117g) and dissolve them in 100mL pure water, heat and dissolve to obtain a yellow precursor suspension, then transfer to a three-necked flask, microwave reaction 800W , 100°C, 5h, finally washed with water, filtered and dried to obtain indium vanadate A.

[0032] Step (2): Weigh 1mmol of cadmium acetate (0.266g) and 2mmol of thiourea (0.076g) and dissolve them in 40mL of pure water, ultrasonically disperse to obtain a transparent solution, then transfer to a 50mL hydrothermal kettle, and conduct a hydrothermal reaction at 160°C , 24h, finally washed with water, filtered and dried to obtain cadmium sulfide B.

[0033] Step (3): Dissolve 0.030g of indium vanadate A, 1mmol of cadmium acetate (0.266g) and 2mmol of thiourea (0.076g) in 40mL of pure water, ultrasonically disperse to obtain a light yellow precursor suspension, and then transfer to 50mL In a hydrothermal kettle, the hydrothermal rea...

Embodiment 3

[0035] Step (1): Weigh 1mmol indium nitrate (0.382g) and 1mmol ammonium metavanadate (0.117g) in 100mL pure water, heat and dissolve to obtain a yellow precursor suspension, then transfer to a three-necked flask, microwave reaction 800W, 100 ℃, 5h, and finally washed with water, filtered and dried to obtain indium vanadate A.

[0036] Step (2): Weigh 1mmol of cadmium acetate (0.266g) and 2mmol of thiourea (0.076g) and dissolve them in 40mL of pure water, ultrasonically disperse to obtain a transparent solution, then transfer to a 50mL hydrothermal kettle, and conduct a hydrothermal reaction at 160°C , 24h, finally washed with water, filtered and dried to obtain cadmium sulfide B.

[0037] Step (3): Dissolve 0.060g of indium vanadate A, 1mmol of cadmium acetate (0.266g) and 2mmol of thiourea (0.076g) in 40mL of pure water, and ultrasonically disperse to obtain a pale yellow precursor suspension, which is then transferred to 50mL In a hydrothermal kettle, the hydrothermal react...

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Abstract

The invention relates to the technical field of semiconductor photocatalysis, in particular to a preparation method and application of an InVO4-CdS heterojunction photocatalyst. According to the method, a visible-light response indium vanadate and cadmium sulfide composite photocatalyst material is obtained by taking cadmium acetate, thiourea, indium nitrate and ammonium metavanadate as raw materials through a microwave synthesis method and a hydrothermal method.

Description

technical field [0001] The invention relates to the technical field of semiconductor photocatalysis, in particular to an InVO 4 The preparation method and application of the / CdS heterojunction photocatalyst, using a microwave synthesis method and a hydrothermal method to synthesize a heterojunction photocatalyst of indium vanadate and cadmium sulfide in two steps, can be used to degrade rhodamine B dye under visible light. Background technique [0002] In recent years, the development and utilization of green and non-polluting solar energy to solve the increasing environmental pollution and energy crisis has been a research hotspot, and semiconductor photocatalysis technology can maximize the use of solar energy to achieve sewage purification and energy conversion. Semiconductor photocatalysis technology It uses electron-hole pairs with high redox ability generated by semiconductor photocatalyst materials under light to realize the degradation and removal of organic polluta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J23/847C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J23/8472B01J27/04C02F2101/308C02F2305/10B01J35/39Y02W10/37
Inventor 施伟东孟亚东洪远志黄长友黄凯陈继斌李春发张光倚殷秉歆
Owner JIANGSU UNIV
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