AgBr/ZVO catalyst with visible light catalytic activity as well as preparation method and application thereof

A technology for catalysts and composite catalysts, applied in the directions of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of limited application, low utilization of sunlight, etc., to achieve high-efficiency photocatalytic degradation performance, improve The effect of visible light catalytic activity

Inactive Publication Date: 2017-12-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the wide band gap of zinc pyrovanadate, the utilization rate of sunlight is low, which limits its practical application, and there are still relatively few studies on its visible light catalytic modification.

Method used

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  • AgBr/ZVO catalyst with visible light catalytic activity as well as preparation method and application thereof
  • AgBr/ZVO catalyst with visible light catalytic activity as well as preparation method and application thereof
  • AgBr/ZVO catalyst with visible light catalytic activity as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation process of AgBr / ZVO composite catalyst is as follows:

[0029] Step 1, press Zn: V=3: 2 (mol ratio), take by weighing a certain amount of Zn (NO 3 ) 2 ·6H 2 O and NaVO 3 2H 2 O was dissolved in distilled water, NaVO 3 After the solution was ultrasonically dispersed, Zn(NO 3 ) 2 In the solution, continue magnetic stirring to obtain the precursor solution;

[0030] Step 2. Use concentrated ammonia water to adjust the pH of the precursor solution obtained in step 1 to 6-10 (the specific pH is 6, 8, and 10), stir evenly, transfer to the reaction kettle, and seal it well;

[0031] Step 3. Heat the precursor solution in the reactor in step 2 at 70-160°C (the specific temperatures are 70°C, 90°C, 120°C, 140°C, and 160°C) for 2-20h (the specific time is 2h, 10h, and 20h respectively) );

[0032] Step 4. After the reaction kettle in step 3 is naturally cooled to room temperature, filter, wash with distilled water several times, and dry to obtain zinc pyr...

Embodiment 2

[0042] In order to test the effect of the pH value of the precursor solution on the visible light activity of AgBr / ZVO, AgBr / ZVO composites were prepared under different pH values ​​of the precursor solution when the hydrothermal temperature was 120 °C, the hydrothermal time was 10 h, and the composite ratio of AgBr was 0.05. catalyst. The results showed that when the pH value of the precursor solution was 10, the decolorization rate of AgBr / ZVO to methylene blue was the highest, and when the pH value of the precursor solution was acidic, the decolorization effect was poor. When the pH of the precursor solution was 6, the decolorization rate of AgBr / ZVO to methylene blue was 54.9%; when the pH of the precursor solution was 8, the decolorization rate of AgBr / ZVO to methylene blue was 65.5%; The decolorization rate of ZVO to methylene blue was 71.8%. Overall, the decolorization ability of AgBr / ZVO gradually increases with the increase of the pH value of the synthetic catalyst p...

Embodiment 3

[0044] In order to examine the effect of hydrothermal temperature on the visible light activity of AgBr / ZVO, AgBr / ZVO composite catalysts were prepared at different hydrothermal temperatures when the precursor solution pH was 10, the hydrothermal time was 10 h, and the composite ratio of AgBr was 0.05. When the hydrothermal temperature was 70°C, 90°C, 120°C, 140°C, 160°C, the decolorization rate of AgBr / ZVO to methylene blue was 61.9%, 64.3%, 71.8%, 70.6%, 70.9%. The results showed that the decolorization rate of methylene blue was the highest when the hydrothermal temperature was 120°C. Combined with the XRD patterns of the composite catalysts prepared at different hydrothermal temperatures, it can be seen that the crystal form of the catalyst gradually becomes better with the increase of the hydrothermal temperature, which can improve the photocatalytic activity of the catalyst to a certain extent; but with the increase of the crystallinity , the particle size of the catalys...

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Abstract

The invention belongs to the field of photocatalysis, and particularly relates to an AgBr / Zn3 (OH)2V2O7.2H2O compound catalyst as well as a preparation method thereof. In the method, Zn3(OH)2V2O7.2H2O (ZVO for short) is adopted to compound narrow-bandgap AgBr, and AgBr / ZVO compound catalyst of different mass ratios is prepared through two steps of water heat and precipitation. According to the compound catalyst, the visible light catalytic activity of pyrovanadic acid zinc is improved to a certain degree, and photocatalytic efficiency is further improved. The invention discloses a preparation method for the AgBr / ZVO catalyst.

Description

technical field [0001] The invention relates to a composite catalyst with visible light catalytic activity, in particular to an AgBr / ZVO composite catalyst. Background technique [0002] With the rapid development of industrial technology, the problems of global environmental pollution and resource shortage are becoming increasingly serious. Traditional pollution control technologies such as physical adsorption, chemical oxidation, and biodegradation are often unable to meet the current needs due to excessive energy consumption, high cost, easy to produce secondary pollution, and incomplete degradation of pollutants. Therefore, people urgently need to find or develop a green and energy-saving technology to solve the dual problems of resources and environment at the same time. Photocatalytic technology is a green technology with important application prospects in both energy and environmental fields, and the research and development and preparation of efficient visible photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J37/03C02F1/30C02F101/38
CPCB01J27/08B01J23/002B01J35/004B01J37/031B01J37/036C02F1/30C02F2101/40
Inventor 王洁陈建林黄珍珍曹江平黄雪松
Owner NANJING UNIV
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