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Composite photocatalysis system, and preparation method and application thereof

A photocatalytic and composite technology, applied in the field of photocatalysis, can solve the problems of green and high-efficiency pollutant degradation system, no formation, long processing time, etc., and achieve the effect of high-efficiency photocatalytic degradation

Active Publication Date: 2017-04-26
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there have been many methods used to degrade pollutants, such as biological, physical and chemical, flocculation and adsorption methods, but the biological method requires a long time to cultivate microorganisms, so the treatment time is longer; other methods just stay at how to degrade pollutants At the same level, a green and efficient pollutant degradation system that is beneficial to the environment has not been formed

Method used

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  • Composite photocatalysis system, and preparation method and application thereof
  • Composite photocatalysis system, and preparation method and application thereof
  • Composite photocatalysis system, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Composite photocatalytic system Er 3+ :Y 3 Al 5 o 12 / (MoS 2 / NiGa 2 o 4 )-(BiVO 4 / PdS)

[0022] The preparation method is as follows:

[0023] 1) Preparation of Er 3+ :Y 3 Al 5 o 12 Nanoparticles: 2.2715 g of Er 2 o 3 and 0.0128g Y 2 o 3 powder, magnetically stirred and heated and kept at 60°C, dissolved in concentrated nitric acid until colorless and transparent, and mixed rare earth oxide solution was obtained. Then 12.6208gAl(NO 3 ) 3 9H 2 O and solid citric acid (the molar ratio of citric acid and rare earth ions is 3:1) were dissolved in double distilled water, and slowly added to the mixed rare earth oxide solution prepared above, and stirred at 50-60 °C until The solution is a viscous foaming gel-like solution. Then place it in an oven at 80° C. for 36 hours to obtain a gel. The obtained gel was first heated to 500 °C and maintained for 50 min in a muffle furnace, and then continued to be heated to 1100 °C for 2.0 h. Finally, the...

Embodiment 2

[0031] Example 2 Photocatalytic degradation of dye-orange G by composite photocatalytic system

[0032] Method: Measure 25mL of 10mg / L Orange G solution in a 100mL Erlenmeyer flask, add 25mg of different NiGa prepared in Example 1 2 o 4 and BiVO 4 Composite photocatalytic system with molar ratio Er 3+ :Y 3 Al 5 o 12 / (MoS 2 / NiGa 2 o 4 )-(BiVO 4 / PdS), irradiated under visible light (300W) for 8.0h. Filter and measure its UV spectrum at 200-800nm. The absorbance at 475nm was used to calculate the degradation rate of Orange G, and the results are shown in Table 1.

[0033] Degradation rate (%) = (C 0 –C) / C 0 ×100%

[0034] Among them, C 0 : the concentration of the stock solution; C: the concentration of the sample

[0035] Table 1 Visible light photocatalytic degradation of orange G by different composite photocatalytic systems

[0036]

[0037] As shown in Table 1, with the prolongation of the light time, the degradation rate of orange G by the three catal...

Embodiment 3

[0038] Example 3 Composite photocatalytic system uses dye-orange G as a sacrificial agent to photocatalyze hydrogen production

[0039] Method: Measure 500mL of 50mg / L orange G solution in the photocatalytic hydrogen production reactor, add 200mg of different NiGa prepared in Example 1 2 o 4 and BiVO 4 Composite photocatalytic system with molar ratio Er 3+ :Y 3 Al 5 o 12 / (MoS 2 / NiGa 2 o 4 )-(BiVO 4 / PdS), irradiated under visible light (300W) for 8.0h. Gas chromatography was used to measure the amount of hydrogen generated during the reaction. The results are shown in Table 2.

[0040] Table 2 Visible light photocatalytic hydrogen production of different composite photocatalytic systems

[0041]

[0042] As shown in Table 2, with the prolongation of the light time, the hydrogen production of the three catalysts and the BiVO 4 The amount of hydrogen in the catalytic system increases, and the hydrogen production also shows an increasing trend. in NiGa 2 o 4 ...

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Abstract

The invention relates to a composite photocatalysis system, and a preparation method and application thereof. The composite photocatalysis system is Er<3+>: YeAl5O12 / (MoS2 / NiGa2O4)-(BiVO4 / PdS). The preparation method comprises the following steps: synthesizing nanometer particles of an up-conversion luminescence agent Er<3+>: YeAl5O12 by using a sol-gel method; then synthesizing NiGa2O4 and BiVO4 by using a hydrothermal method and preparing Er<3+>: YeAl5O12 / NiGa2O4-BiVO4; and loading a conduction band cocatalyst MoS2 and a valence band cocatalyst PdS so as to obtain the composite photocatalysis system. The novel composite photocatalysis system designed in the invention has strong oxidation-reduction performance; and the novel composite photocatalysis system uses pollutants as resources and produces hydrogen energy during removal of pollutants, so the dual purposes of environment treatment and production of clean energy are achieved.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a composite photocatalytic system Er 3+ :Y 3 Al 5 o 12 / (MoS 2 / NiGa 2 o 4 )-(BiVO 4 / PdS) and its application in simultaneous hydrogen production by photodegradation of organic pollutants under visible light irradiation. Background technique [0002] Environmental pollution has evolved into a serious problem that human beings must face in the process of social development. In the dye industry, some azo dyes are produced. Due to their stable structure, high toxicity and electron-withdrawing groups, they are difficult to degrade. Such refractory pollutants will exist in the environment for a long time, causing great harm to the ecological environment and human health. However, it is also a waste of resources to degrade such refractory pollutants without utilizing them. So an economically reasonable solution should be proposed to solve this problem. In fact, refractory poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C02F1/30C01B3/02C02F101/30C02F101/38
CPCC01B3/02C02F1/30B01J27/0515C02F2101/38C02F2101/308B01J35/39Y02W10/37
Inventor 张朝红荣洋王君刘逸伦孙意忱沈曼莉纪剑峰
Owner LIAONING UNIVERSITY
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