Low-temperature preparation method of copper sulfide/titanium oxide hetero-junction photocatalyst

A photocatalyst, heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of difficult to deal with solubility industrial wastewater and waste gas, hinder the development and application of industrialization, catalyst The problem of high preparation cost is to achieve the effect of improving photocatalytic efficiency, low price and improving photocatalytic activity.

Inactive Publication Date: 2015-04-01
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] But with TiO 2 There are still some key scientific problems in semiconductor-based photocatalytic technology, which hinder its industrial development and application.
Mainly include: (1) TiO 2 The quantum efficiency is relatively low
In practical applications, TiO 2 The highest quantum efficiency does not exceed 10%, and it is difficult to treat industrial wastewater and waste gas with high solubility or large volume
(2)TiO 2 It is a wide-bandgap photocatalyst that can only be excited by ultraviolet light
But when combining CuS with TiO 2 During the compounding process, usually in order to improve the activity of the catalyst, high-temperature calcination and other high-temperature treatments are required, which not only cause the aggregation of nanoparticles or the oxidation of CuS, but also the preparation route is relatively complicated, which makes the preparation cost of the catalyst high and limits its practicality. application

Method used

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  • Low-temperature preparation method of copper sulfide/titanium oxide hetero-junction photocatalyst
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  • Low-temperature preparation method of copper sulfide/titanium oxide hetero-junction photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Low-temperature Preparation and Photocatalytic Activity of Copper Sulfide / Titanium Oxide (Anatase Phase) Heterojunction Photocatalyst

[0042] 1.1CuS / TiO 2 (Anatase crystal phase) The low-temperature preparation method of heterojunction photocatalyst comprises the following steps:

[0043] (1) Add 40ml Ti(OBu) 4 Dissolve in 200ml of absolute ethanol and stir well, slowly add ammonia water dropwise to the solution under full stirring to adjust pH=9, and then continue stirring for 24h. The precipitate was filtered and washed twice with deionized water and absolute ethanol, and then dried at 110 °C to obtain Ti(OH) 4 ;

[0044] (2) At a temperature of 400°C, the Ti(OH) obtained in step (1) 4 Carry out roasting, roasting 2h, obtain TiO 2 Carrier (anatase crystal phase);

[0045] (3) Disperse 0.0201g of copper powder and 0.0106g of sulfur powder in a mixed solvent of ethylene glycol and water (the volume ratio of ethylene glycol and water is 5:1), and 15.013g of TiO 2...

Embodiment 2

[0055] Low-temperature Preparation and Photocatalytic Activity of Copper Sulfide / Titanium Oxide (Anatase and Rutile Mixed Crystal Phase) Heterojunction Photocatalyst

[0056] 2.1CuS / TiO 2 (Anatase and rutile mixed crystal phase) The low-temperature preparation method of the heterojunction photocatalyst comprises the following steps:

[0057] (1) Dissolve 100ml of TTIP in 400ml of absolute ethanol and stir thoroughly to obtain a light yellow solution. This solution is slowly added to the mixed solution of 200ml absolute ethanol and deionized water (the volume ratio of absolute ethanol and deionized water is 1:5), continue stirring, after the solution becomes a transparent sol, stand still to obtain Clear gel. Then most of the solvent was evaporated in a water bath, and the product was dried at 110°C for 12 hours to obtain Ti(OH) 4 ;

[0058] (2) At a temperature of 650°C, the Ti(OH) obtained in step (1) 4 Carry out roasting, roasting 4h, obtain TiO 2 Carrier (mixed crysta...

Embodiment 3

[0075] Low-temperature Preparation of Copper Sulfide / Titanium Oxide (Anatase and Rutile Mixed Phase) Heterojunction Photocatalyst

[0076] 3.1CuS / TiO 2 (Anatase and rutile mixed crystal phase) The low-temperature preparation method of the heterojunction photocatalyst comprises the following steps:

[0077] (1) Prepare 0.2mol / L TiCl 4 solution, the TiCl 4 The solution was slowly added to deionized water, followed by NH 3 ·H 2 O to adjust the pH to around 8. After stirring for 4 h, the precipitate was filtered, and the resulting precipitate was thoroughly washed with distilled water until AgNO 3 The solution cannot detect chloride ions in the filtrate, which is then dried at 110 °C to obtain Ti(OH) 4 ;

[0078] (2) At a temperature of 550°C, the Ti(OH) obtained in step (1) 4 Carry out roasting, roasting 2h, obtain TiO 2 Carrier (mixed crystal phase of anatase and rutile);

[0079] (3) Disperse 0.0504g of copper powder and 0.0250g of sulfur powder in a mixed solution of...

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Abstract

The invention relates to a low-temperature preparation method of a copper sulfide (CuS)/titanium oxide (TiO2) hetero-junction photocatalyst. The method comprises the steps of (1) preparing titanium hydroxide (Ti(OH)4) by using an inorganic salt or an organic salt of titanium as a precursor and adopting a precipitation method or a sol-gel method; (2) roasting Ti(OH)4 at the temperature of 400-650 DEG C for 2-4h to obtain a TiO2 carrier; (3) dispersing copper powder and sulfur powder into a specific solvent, soaking the TiO2 carrier into the solvent, performing magnetic stirring, and heating for 4-24h in a water bath of 40-60 DEG C, wherein CuS generated by the copper powder and the sulfur powder can be loaded to the TiO2 carrier in the process; and (4) cooling the CuS/TiO2 sample to room temperature, and filtering, washing and drying the sample to obtain the CuS/TiO2 hetero-junction photocatalyst.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a low-temperature preparation method of a copper sulfide / titanium oxide heterojunction photocatalyst. Background technique [0002] Environmental and energy issues are the greatest challenges facing mankind in the 21st century. Photocatalytic technology has aroused great interest of governments and scientists, and is considered to be one of the effective means to solve environmental pollution and energy crisis. Nano-TiO 2 Because of its excellent photochemical activity, acid and alkali resistance and photochemical corrosion, non-toxicity, and low preparation cost, it has become one of the most promising photocatalytic materials and photovoltaic materials. Currently, TiO 2 Semiconductor photocatalytic materials based on semiconductors have become the research hotspot and focus of scientists from all over the world, and have aroused extensive interest and attention from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/34C02F101/38
CPCY02W10/37
Inventor 张静吴维成张阳阳储刚罗根祥阎松
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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