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Z-type photocatalyst as well as preparation method and application thereof

A photocatalyst, bismuth oxyiodide technology, applied in the field of photocatalysis, can solve the problems of weak catalytic effect and reduced catalytic efficiency, achieve catalytic activity and catalytic efficiency improvement, simple preparation method, and improve the effect of reduced catalytic efficiency

Inactive Publication Date: 2018-12-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention mixes elemental silver and silver iodide in bismuth oxyiodide, which improves the defects of weak catalytic effect and reduced catalytic efficiency of bismuth oxyiodide due to the high energy level of the conduction band, and the catalytic activity of the Z-type photocatalyst and the catalytic efficiency has been significantly improved

Method used

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  • Z-type photocatalyst as well as preparation method and application thereof
  • Z-type photocatalyst as well as preparation method and application thereof
  • Z-type photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A Z-type photocatalyst is prepared through the following process:

[0033] (1) Take 0.5g BiOBr 0.3 I 0.7 The photocatalyst was added to 50mL silver nitrate solution of different concentrations, wherein silver element and BiOBr in the silver nitrate solution 0.3 I 0.7 The molar ratios of iodine in the solution were 0.05, 0.1, 0.15, and 0.2 respectively; the resulting suspension was stirred at room temperature for 1 hour to precipitate AgI in situ on the BiOBr 0.3 I 0.7 superior;

[0034] (2) Place the obtained suspension under a 300W xenon lamp with an output current of 15mA, a vertical distance from the solution plane of 30cm, stirring at a rate of 500r / min and light for 10min. After the illumination was completed, the obtained product was centrifuged, washed with deionized water for 3 times and dried at 60 °C to obtain a series of bismuth oxyhalide Z-type photocatalysts BiOBr 0.3 I 0.7 / Ag / AgI-x (BAA-x), where x is the molar ratio of silver to iodine.

[0035] ...

Embodiment 2

[0042] With reference to the preparation method in Example 1, the difference is that the bismuth oxyiodide used is BiOCl 0.3 I 0.7 , to prepare BiOCl 0.3 I 0.7 / Ag / AgI-x, where x ranges from 0 to 1.

[0043] Specifically prepared Z-type photocatalysts include BiOCl 0.3 I 0.7 / Ag / AgI-0.15, BiOCl 0.3 I 0.7 / Ag / AgI-0.1 and BiOCl 0.3 I 0.7 / Ag / AgI-0.2.

Embodiment 3

[0045] With reference to the preparation method in Example 1, the difference is that the bismuth oxyiodide that adopts is BiOBr 0.5 I 0.5 , to prepare BiOBr 0.5 I 0.5 / Ag / AgI-x, where x ranges from 0 to 1.

[0046] Specifically prepared Z-type photocatalysts include BiOBr 0.5 I 0.5 / Ag / AgI-0.15, BiOBr 0.5 I 0.5 / Ag / AgI-0.1 and BiOBr 0.5 I 0.5 / Ag / AgI-0.2.

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Abstract

The invention discloses a Z-type photocatalyst as well as a preparation method and application thereof. The Z-type photocatalyst is shown as BiOYnI1-n / Ag / AgI-x, wherein Y is halogen; x is the molar ratio of silver to iodine, and the value of x ranges from 0 to 1; n is 0 to 1; n is not equal to 1. The Z-type photocatalyst is prepared by doping silver and silver iodide into bismuth iodide, thereby improving the defects of weaker catalytic action and lower catalytic efficiency caused by higher conduction band energy level of the bismuth iodide, and remarkably improving the catalytic activity andcatalytic efficiency of the Z-type photocatalyst. Moreover, the preparation method of the Z-type photocatalyst is simple, and the photocatalytic performance of the photocatalyst can be adjusted by controlling the using amount of soluble silver salt and illumination conditions and controlling the content of silver and silver iodide.

Description

technical field [0001] The present invention relates to the technical field of photocatalysis, and more specifically, relates to a Z-type photocatalyst and its preparation method and application. Background technique [0002] Photocatalysis is a low-energy, economical, safe, and green environmental protection technology. Because of its low energy consumption, mild reaction conditions, and no secondary pollution of reaction products, it has been used in sewage treatment, air purification, and water decomposition. fields such as hydrogen. Bismuth oxyhalide solid solution (201710823696.1) is a new type of photocatalyst, because of its unique layered structure, it has good electron transport efficiency and good catalytic performance, and the conduction band and valence band position of bismuth oxyhalide solid solution can be determined according to The actual use needs to change the addition ratio of different halogens, so as to adjust. However, due to the high conduction band...

Claims

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Application Information

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IPC IPC(8): B01J27/08C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J27/08C02F2305/10C02F2101/34C02F2101/38C02F2101/40C02F2101/30C02F2101/308B01J35/39
Inventor 王新卢俊霖陈志鸿黄兰艳周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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