Preparation method of TiO2/BiOCl heterojunction visible light photocatalyst

A heterojunction, visible light technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of no research on BiOCl sheet/porous TiO, complicated preparation process, and low photocatalytic efficiency. The problem is to achieve the effect of high visible light catalytic activity, simple method and process, and simple equipment.

Active Publication Date: 2018-01-12
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0006] Literature "Wang Lei, Wang Zhijun, Wang Yuting et al., BiOCl / TiO 2 Research on Visible Light Activity and Mechanism of Composite Materials, Journal of Environmental Science, 2015, 1, 222‐228" discloses a preparation method of BiOCl / TiO 2 method, but it is necessary to prepare BiOCl by hydrothermal method first, then add BiOCl powder into titanium colloid, and then prepare BiOCl / TiO by sol-gel method 2 , the preparation process is complicated; the literature "Miguel Guerrero, Ainhoa ​​Altube, Eva García‐Lecina, Facile in situsynthesis of BiOCl nanoplates stacked to highly porous TiO 2 : A synergisticcombination for environmental remediation" discloses a method for preparing BiOCl sheets / porous TiO 2 The method of composite materials, but it needs to use two hydrothermal methods to prepare BiOCl / TiO 2 Precursors, followed by the preparation of BiOCl sheets / porous TiO by sol-gel method 2 , the preparation process is complex and cumbersome; and Ti[O(CH 2 ) 3 CH 3 ] 4 , BiCl 3 and other chemical reagents and P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer) are used as template agents, and the raw materials are complex; in addition, the literature does not study BiOCl sheet / porous TiO 2 Visible light performance, and its degradation rate of rhodamine B is 86% under ultraviolet-visible light irradiation (light radiation wavelength λ=320~500nm) for 180min, and the photocatalytic efficiency is not high
Literature "YunyuCai, Panpan Wang, Yixing Ye, Grafting BiOCl nanosheets onto TiO 2 Tubular arrays to form a hierarchical structure with improved photocatalytic performance, RSCAdvances, 2013, 3, 19064–19069" discloses a BiOCl nanosheet / TiO 2 tube array method, but requires the use of anodic oxidation to prepare TiO 2 Tube array, the preparation process is complicated, and this document only studies the photocatalytic performance of its sample under ultraviolet light irradiation, and the degradation rate of methyl orange is 60% under ultraviolet light irradiation (light radiation wavelength λ=365nm) 5h, Photocatalytic efficiency is not high

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  • Preparation method of TiO2/BiOCl heterojunction visible light photocatalyst
  • Preparation method of TiO2/BiOCl heterojunction visible light photocatalyst
  • Preparation method of TiO2/BiOCl heterojunction visible light photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 1.18g of Bi 2 o 3 , 0.30g of TiO 2, 4.68g of KCl and 3.67g of NaCl, put them in a ball mill jar and add 50ml of absolute ethanol, mix and ball mill for 3 hours, and dry at 80°C after ball milling to obtain powder A; put powder A into the muffle Calcined in the furnace at 800°C for 2h, cooled to room temperature with the furnace, fully washed the obtained product with deionized water to remove NaCl and KCl, and dried at 80°C to obtain the reaction precursor B; 0.12g of the reaction precursor B Put it into a beaker, add 30ml of deionized water, and add 0.5ml of hydrochloric acid with a mass fraction of 36.5%, and ultrasonically treat it for 0.5h to obtain a mixture C; heat the mixture C at 100°C for 2h, and dry to obtain TiO 2 / BiOCl heterojunction powder.

[0032] figure 1 TiO prepared for this example 2 / BiOCl heterojunction X-ray diffraction pattern, by figure 1 It can be seen that the product prepared in this embodiment is TiO 2 / BiOCl complex, and the Bi...

Embodiment 2

[0039] Weigh 2.36g of Bi 2 o 3 , 0.61g of TiO 2 , 9.36g of KCl and 7.31g of NaCl, put them in a ball mill jar and add 60ml of absolute ethanol, mix and ball mill for 5 hours, and dry at 100°C after ball milling to obtain powder A; put powder A into a muffle Calcined in the furnace at 1000°C for 1h, cooled to room temperature with the furnace, fully washed the obtained product with deionized water to remove NaCl and KCl, and dried at 80°C to obtain the reaction precursor B; 0.20g of the reaction precursor B Put it into a beaker, add 60ml of deionized water, and add 2ml of hydrochloric acid with a mass fraction of 36.5%, and sonicate for 1h to obtain a mixture C; heat the mixture C at 120°C for 3h, and dry to obtain TiO 2 / BiOCl heterojunction powder.

[0040] Using the above photocatalytic activity evaluation method, after visible light irradiation for 40min, the TiO prepared in this example 2 The degradation rate of rhodamine B by the / BiOCl heterojunction is about 91%, wh...

Embodiment 3

[0042] Weigh 1.18g of Bi 2 o 3 , 0.30g of TiO 2 , 7.45g of KCl and 5.84g of NaCl, put them in a ball mill jar and add 50ml of absolute ethanol, mix and ball mill for 4 hours, and dry at 100°C after ball milling to obtain powder A; put powder A into the muffle Calcined in the furnace at 900°C for 2h, cooled to room temperature with the furnace, the obtained product was fully washed with deionized water to remove NaCl and KCl, and dried at 80°C to obtain the reaction precursor B; 0.15g of the reaction precursor B Put it into a beaker, add 30ml of deionized water, and add 1.2ml of hydrochloric acid with a mass fraction of 36.5%, and sonicate for 0.5h to obtain a mixture C; heat the mixture C at 120°C for 2h, and dry to obtain TiO 2 / BiOCl heterojunction powder.

[0043] Using the above photocatalytic activity evaluation method, after visible light irradiation for 40min, the degradation rate of the TiO2 / BiOCl heterojunction prepared in this example to rhodamine B was about 89%,...

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Abstract

The invention discloses a preparation method of a TiO2 / BiOCl heterojunction visible light photocatalyst. The preparation method comprises the following steps: adding absolute ethyl alcohol into a powder mixture of Bi2O3, TiO2, NaCl and KCl, mixing and milling, and drying the mixture after uniform mixing to obtain powder A; carrying out calcinations on the powder A at the temperature of 750 to 1100DEG C for 0.5 to 2 h, carrying out furnace cooling to room temperature, and washing and drying an obtained product to obtain a reaction precursor B; adding deionized water into the reaction precursorB, adding hydrochloric acid, and carrying out ultrasonic treatment for 0.2 to 1 h to obtain a mixture C; and heating the mixture C at the temperature of 100 to 120 DEG C for 2 to 4 h to obtain TiO2 / BiOCl heterojunction powder. The raw materials are simple and wide in resources, and the obtained TiO2 / BiOCl heterojunction visible light photocatalyst is excellent in catalytic effect under visible light and obviously has higher photocatalytic activity compared with single commercial TiO2(P25) and BiOCl.

Description

technical field [0001] The present invention relates to TiO 2 Visible light catalysts, especially involving a TiO 2 The invention discloses a preparation method of a BiOCl heterojunction visible light catalyst, belonging to the technical field of semiconductor photocatalyst preparation. Background technique [0002] Semiconductor photocatalysis technology can convert sunlight energy into chemical energy and electrical energy, and can directly use sunlight to degrade and mineralize various pollutants in water and air, which has great potential in environmental purification and new energy development. TiO 2 It has the advantages of safety, non-toxic, odorless and good thermal stability, and is a representative of photocatalytic materials. But TiO 2 It is a wide-bandgap semiconductor with a band gap of 3.2eV. Only when excited by ultraviolet light with a wavelength of less than 388nm can it generate photogenerated electrons and holes, and ultraviolet light accounts for less...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135
Inventor 陈志武朱成彬卢振亚
Owner SOUTH CHINA UNIV OF TECH
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