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Magnetic reduced graphene oxide/silver tungstate composite photocatalyst as well as preparation method and application thereof

A technology of graphene and silver tungstate, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of poor biocompatibility and difficult recycling of catalysts , to achieve good adsorption performance, slow down recombination, and expand the use range

Pending Publication Date: 2021-09-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of poor catalyst biocompatibility and difficult recovery when the existing materials degrade lomefloxacin in wastewater, and provides a recyclable magnetically reduced graphene oxide / silver tungstate composite photocatalyst to degrade lomefloxacin

Method used

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  • Magnetic reduced graphene oxide/silver tungstate composite photocatalyst as well as preparation method and application thereof
  • Magnetic reduced graphene oxide/silver tungstate composite photocatalyst as well as preparation method and application thereof
  • Magnetic reduced graphene oxide/silver tungstate composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] MrGO / Ag prepared in this example 2 WO 4 In the composite catalyst, x=0.5, and the specific preparation steps are as follows:

[0043] a) Weigh 2 g of graphite powder, 1 g of sodium nitrate, 3 g of potassium permanganate and 50 mL of concentrated sulfuric acid in a conical flask, react in an ice-water bath for 2 h, then heat up to 40 °C for 40 min for pre-reaction. Add cold deionized water into the Erlenmeyer flask, raise the temperature to 98 °C and continue heating for 20 min, add hydrogen peroxide to oxidize, wash with deionized water three times, wash with absolute ethanol twice, and vacuum-dry at 60 °C to obtain tablets like graphene oxide (GO).

[0044] b) Weigh 0.3 g flake graphene oxide in 60 mL water for 30 min and stir until completely dissolved to form a uniform graphene oxide solution. Take 8.109 g FeCl3 •6H 2 O and 4.17 g FeSO 4 •7H 2 Dissolve O in a three-neck flask in 40 mL of water and fill with N 2 protection, after heating up to 50°C, quickly add...

Embodiment 2

[0047] The magnetic MrGO / Ag prepared in this embodiment 2 WO 4 In the composite catalyst, x=0.2, and the specific preparation steps are as follows:

[0048] a) Weigh 2 g of graphite powder, 1 g of sodium nitrate, 3 g of potassium permanganate and 50 mL of concentrated sulfuric acid in an Erlenmeyer flask, react in an ice-water bath for 1.5 h, then heat up to 35 °C for 30 min for pre-reaction. Add cold deionized water into the Erlenmeyer flask, raise the temperature to 98 °C and continue heating for 20 min, add hydrogen peroxide to oxidize, wash with deionized water three times, wash with absolute ethanol twice, and vacuum dry at 60 °C to obtain flake oxidation Graphene (GO).

[0049] b) Weigh 0.3 g flake graphene oxide in 60 mL water for 30 min and stir until completely dissolved to form a graphene oxide solution. Take 8.109 g FeCl 3 •6H 2 O and 4.17 g FeSO 4 •7H 2 Dissolve O in a three-neck flask in 40 mL of water and fill with N 2 Protection, ammonia water added quic...

Embodiment 3

[0052] The magnetic MrGO / Ag prepared in this embodiment 2 WO 4 In the composite catalyst, x=0.5, and it is used to degrade lomefloxacin antibiotics. Concrete preparation steps are as follows:

[0053] a) Weigh 2 g of graphite powder, 1 g of sodium nitrate, 3 g of potassium permanganate and 50 mL of concentrated sulfuric acid in a conical flask, react in an ice-water bath for 2 h, then heat up to 40 °C for 40 min for pre-reaction. Add cold deionized water into the Erlenmeyer flask, raise the temperature to 98 °C and continue heating for 20 min, add hydrogen peroxide to oxidize, wash with deionized water three times, wash with absolute ethanol twice, and vacuum dry at 60 °C to obtain flake oxidation Graphene (GO).

[0054] b) Weigh 0.3 g flake graphene oxide in 60 mL water for 30 min and stir until completely dissolved to form a graphene oxide solution. Take 8.109 g FeCl 3 •6H 2 O and 4.17 g FeSO 4 •7H 2 O in a three-hole flask, dissolved in 40 mL of water and filled wit...

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Abstract

The invention discloses a magnetic reduced graphene oxide / silver tungstate composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1, preparing graphene oxide by adopting an improved Hummers' method; 2, preparing magnetic reduced graphene oxide by adopting a coprecipitation method; 3, preparing magnetic reduced graphene oxide / silver tungstate by adopting a hydrothermal method. The magnetic reduced graphene oxide / silver tungstate composite photocatalyst disclosed by the invention can be used for effectively adsorbing and degrading residual lomefloxacin antibiotics in water. The material has relatively strong adsorption effect and photodegradation effect, can be magnetically recycled, avoids secondary pollution and has relatively good biocompatibility.

Description

technical field [0001] The invention relates to the technical field of synthesis of photocatalytic materials, in particular to the preparation and application of a recyclable magnetically reduced graphene oxide / silver tungstate photocatalyst. Background technique [0002] In order to solve the problem of antibiotic pollution in wastewater, in recent years, people have tried biological treatment, sludge digestion, adsorption treatment, photocatalysis, chemical oxidation and membrane treatment. However, a single treatment method often has certain limitations. Therefore, the combination of multiple treatment methods to remove antibiotics has received great attention. Very promising technology. [0003] Graphene oxide (GO), by sp 2 The six-membered ring composed of hybrid carbon atoms is its basic structural unit. It has the characteristics of large specific surface area, high mechanical strength, strong adsorption capacity, hydrophobicity and good thermal stability. It has va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/03B01J37/10B01J37/12C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J23/8993B01J23/002B01J37/12B01J37/031B01J37/10C02F1/30B01J2523/00C02F2305/10C02F2101/34C02F2101/36C02F2101/38B01J35/33B01J35/39B01J2523/18B01J2523/69B01J2523/842
Inventor 何熙璞孙悦张希韩镇龙杜鹏飞黄涛
Owner GUANGXI UNIV
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