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Symmetrical reverse-Z-type photo-catalyst, preparation method and application thereof

A photocatalyst, symmetrical technology, applied in the field of photocatalysis, which can solve the problems of long period and no formation

Active Publication Date: 2018-12-18
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biological method requires a long period of time to cultivate microorganisms, and the cycle is long, while other methods only stay at the level of how to degrade pollutants, and have not formed a green, efficient, and environmentally friendly pollutant degradation system.

Method used

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  • Symmetrical reverse-Z-type photo-catalyst, preparation method and application thereof
  • Symmetrical reverse-Z-type photo-catalyst, preparation method and application thereof
  • Symmetrical reverse-Z-type photo-catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Symmetric inverse Z-type photocatalyst ZnIn 2 S 4 / Er 3+ :Y 3 Al 5 o 12 @ZnTiO 3 / CaIn 2 S 4

[0021] The preparation method is as follows:

[0022] 1. ZnIn 2 S 4 Preparation of:

[0023] ZnCl 2 (0.68g) and In(NO 3 ) 3 (3.0g) was dissolved in 80mL of deionized water, then thioacetamide (2.3g) was added, stirred on a magnetic ion stirrer for 1.0h to form a transparent solution. Then the formed transparent solution was transferred to a polytetrafluoroethylene-lined stainless steel reactor and heat-treated at 160 °C for 6.0 h. The obtained product was cooled to room temperature, and then washed with deionized water and ethanol. Finally, the obtained product was put into an oven, dried at 80° C. for 6.0 h, and ground.

[0024] 2. CaIn 2 S 4 Preparation of:

[0025] Ca(NO 3 ) 2 4H 2 O(1.2g), In(NO 3 ) 3 (3.0g) was dissolved in 80mL deionized water, stirred with magnetic force at room temperature until completely dissolved, then added thioac...

Embodiment 2

[0035] Example 2 Photocatalytic Degradation of Acid Orange II by Symmetric Inverse Z-type Photocatalyst

[0036] Simulated sunlight photocatalytic degradation: Measure 25mL of 10mg / L Acid Orange II solution in a 100mL Erlenmeyer flask, add 25mg of the catalyst of the present invention and comparative example prepared in Example 1 as shown in Table 1, and irradiate 6.0 mg under simulated sunlight h. Filter and measure its UV spectrum at 200-800nm. Take the absorbance at 485nm to calculate the degradation rate of Acid Orange II, and the results are shown in Table 1.

[0037] Degradation rate (%) = (C 0 –C) / C 0 ×100% (where C 0 : the concentration of the stock solution; C: the concentration of the sample)

[0038] (1) Effect of light time on degradation rate

[0039] Table 1 ZnIn 2 S 4 / Er 3+ :Y 3 Al 5 o 12 @ZnTiO 3 / CaIn 2 S 4 Photocatalytic degradation of acid orange Ⅱ by simulated sunlight

[0040]

[0041] As shown in Table 1, with the prolongation of the l...

Embodiment 3

[0047] Example 3 Symmetric inverse Z-type photocatalyst photocatalytic hydrogen production with Acid Orange II as sacrificial agent

[0048] Method: Measure 500 mL of 50 mg / L Acid Orange II solution in a photocatalytic hydrogen production reactor, add 500 mg of the catalysts of the present invention and comparative examples prepared in Example 1 as shown in Table 1, and irradiate with visible light for 6.0 h. Gas chromatography was used to measure the amount of hydrogen generated during the reaction. The results are shown in Table 3.

[0049] (1) Effect of light time on hydrogen production

[0050] Table 3 Symmetric inverse Z-type photocatalyst simulated sunlight photocatalytic hydrogen production

[0051]

[0052] As shown in Table 3, with the prolongation of the light time, the hydrogen production of the four catalysts increased with time, and the hydrogen production showed an increasing trend. Among them, when the light time is 6.0h, ZnIn 2 S 4 / Er 3+ :Y 3 Al 5 o...

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Abstract

The invention relates to a symmetrical reverse-Z-type photo-catalyst, a preparation method and an application thereof. The method includes: 1) synthesizing ZnIn2S4 and CaIn2S4 through hydrothermal method and synthesizing ZnTiO3 and Er3+: Y3Al5O12 through a sol-gel process; 2) according to certain mass ratio, adding the Er3+: Y3Al5O12 to ZnTiO3 sol to finally obtain an Er3+: Y3Al5O12 @ ZnTiO3 composite; 3) because the materials have different isoelectric points, regulating pH value to a certain range, and calcining the materials to prepare the ZnIn2S4 / Er3+: Y3Al5O12 @ ZnTiO3 / CaIn2S4 photo-catalyst. The symmetrical reverse-Z-type photo-catalyst, ZnIn2S4 / Er3+: Y3Al5O12 @ ZnTiO3 / CaIn2S4, can degrade organic pollutants under simulative sunlight irradiation and prepare hydrogen at the same time.The photo-catalyst, by using the pollutants as a recyclable energy resource, achieves double objects of environment treatment and clean energy production.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a composite photocatalytic system ZnIn 2 S 4 / Er 3+ :Y 3 Al 5 o 12 @ZnTiO 3 / CaIn 2 S 4 Preparation and application in photocatalytic degradation of organic pollutants and simultaneous hydrogen production under simulated sunlight irradiation. Background technique [0002] Environmental pollution and energy crisis have become two major problems that need to be solved urgently in the development of today's society. In particular, in recent years, dye wastewater pollution has been particularly serious. Most of these sewages contain azo dyes, which are difficult to degrade due to their stable structure, high toxicity and electron-withdrawing groups. Therefore, such organic pollutants exist in the environment for a long time, which has brought great harm to the ecological environment and human health. However, organic pollutants in sewage are also abundant energy resources, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01B3/04C02F1/30C02F101/34C02F101/38
CPCC01B3/042C02F1/30B01J27/04C01B2203/1041C01B2203/1088C02F2101/40C02F2101/38C02F2101/34C02F2305/10B01J35/39Y02E60/36
Inventor 张朝红王京王君王迪李芳轶郜炜纪剑峰张星圆
Owner LIAONING UNIVERSITY
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