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Preparation and application of bimetallic-substituted solid heteropoly acid salt composite catalysts

A solid heteropolyacid, composite catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high energy consumption, complex preparation process, etc. Simple, cost-effective effect

Active Publication Date: 2019-04-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported heteropolyacid / TiO 2 Composite materials, complex preparation process, high energy consumption, and heteropolyacids are easily soluble in water and difficult to reuse

Method used

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  • Preparation and application of bimetallic-substituted solid heteropoly acid salt composite catalysts
  • Preparation and application of bimetallic-substituted solid heteropoly acid salt composite catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of SnCl 4 Aqueous solution, by SnCl 4 The molar ratio of 0.25:1 to phosphotungstic heteropoly acid is added dropwise to the aqueous solution of phosphotungstic heteropoly acid, and then the CsCl solution is added dropwise at a molar ratio of CsCl to phosphotungstic heteropoly acid of 1.5:1 to obtain a milky white suspension, and Transfer to a reactor, hydrothermally treat at 220°C for 1 h, filter, wash and dry to obtain the nanocomposite catalyst H 0.5 sn 0.25 Cs 1.5 PW 12 o 40 .

[0019] Prepare 10mg / L tetracycline aqueous solution, add H 0.5 sn 0.25 Cs 1.5 PW 12 o 40 , with a working concentration of 0.75g / L, stirred for 0.5h under dark light conditions, and then stirred and reacted for 2.5h under 250W, 365nm ultraviolet light, and the removal rate of tetracycline was 93.3%.

Embodiment 2

[0021] Preparation of SnCl 4 Aqueous solution, by SnCl 4 The molar ratio of 0.25:1 to phosphotungstic heteropoly acid is added dropwise to the aqueous solution of phosphotungstic heteropoly acid, and then the CsCl solution is added dropwise at a molar ratio of CsCl to phosphotungstic heteropoly acid of 1:1 to obtain a milky white suspension, and Transfer to a reactor, hydrothermally treat at 160°C for 5h, filter, wash and dry to obtain the nanocomposite catalyst HSn 0.25 CPW 12 o 40 .

[0022] Prepare 50mg / L tetracycline aqueous solution, add HSn 0.25 CPW 12 o 40 , the working concentration is 0.1g / L, stirred for 0.5h under the condition of dark light, then stirred and reacted for 5h under 250W, 365nm ultraviolet light, the removal rate of tetracycline was 79%.

Embodiment 3

[0024] Preparation of SnCl 4 Aqueous solution, by SnCl 4 The molar ratio of phosphotungstic heteropoly acid to 0.25:1 is added dropwise to phosphotungstic heteropoly acid and TiO 2 In the suspension solution, phosphotungstic heteropolyacid and TiO 2 The molar ratio of CsCl to phosphotungstic heteropolyacid is 1:100, and then the CsCl solution is added dropwise according to the molar ratio of CsCl and phosphotungstic heteropoly acid 1:1 to obtain a milky white suspension, which is transferred to a reaction kettle, hydrothermally treated at 200°C for 2 hours, filtered, Washed and dried to obtain the nanocomposite catalyst HSn 0.25 CPW 12 o 40 / TiO 2 , see the attached SEM spectrum figure 1 , see attached XRD spectrum figure 2 .

[0025] Prepare 15mg / L dimethoate aqueous solution, add HSn 0.25 CPW 12 o 40 , the working concentration was 1g / L, stirred for 0.5h under dark light conditions, then stirred and reacted for 2h under 250W, 365nm ultraviolet light, and the dime...

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Abstract

The invention provides preparation and application of bimetallic-substituted solid heteropoly acid salt composite catalysts, and belongs to the fields of new energy materials and environmental protection engineering. According to the invention, light absorption performance and enhanced charge separation efficiency of a heteropoly acid in the ultraviolet-visible spectrum range are fully utilized, and a series of the bimetallic solid heteropoly acid saltcomposite catalysts are prepared by using a manner of replacing heteropoly acid protons by a bimetallic salt under the hydrothermal conditions;the composite catalysts can be separately used as a solid acid and a photocatalyst for catalytic conversion of biomass and photocatalytic oxidative degradation of organic pollutants, has the advantages of mild preparation conditions, high catalytic activity and reusability, can be applied to treatment of pesticide wastewater, dye wastewater and phenolic wastewater, and provides a novel treatment technology for reducing high-concentration organic pollutants in the wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and relates to a preparation method of a solid heteropolyacid salt composite catalyst and its application in photodegradation of organic pollutants. Background technique [0002] Photocatalytic degradation technology is an emerging and effective method to reduce refractory organic compounds in the environment. Among semiconductor photocatalysts, titanium dioxide (TiO 2 ) has attracted much attention due to its high photocatalytic activity, high chemical stability, low toxicity, and low cost. However, the high recombination rate of photogenerated electrons and holes leads to low photon quantum efficiency. In order to eliminate this drawback, the researchers on TiO 2 Many modification studies have been carried out, such as doping of metal ions and non-metal ions, co-deposition of metals, compounding with other semiconductors, dye sensitization on the surface of titan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188C02F1/30
CPCC02F1/30B01J27/188C02F2305/10B01J35/39
Inventor 郭峰金盈
Owner DALIAN UNIV OF TECH