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Preparation method of silver sulfide/silver phosphate/graphene oxide composite photocatalyst

A graphene composite and photocatalyst technology, which is applied in the field of photocatalytic materials, can solve the problems of low degradation rate and poor stability of composite photocatalysts, and achieve the effects of improving separation, improving photocatalytic degradation performance, and reducing solubility

Pending Publication Date: 2020-01-17
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But according to Ag 3 PO 4 Further investigation of composite photocatalysts revealed that Ag 3 PO 4 / Ag 2 S composite photocatalyst has poor stability and low degradation rate

Method used

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  • Preparation method of silver sulfide/silver phosphate/graphene oxide composite photocatalyst
  • Preparation method of silver sulfide/silver phosphate/graphene oxide composite photocatalyst
  • Preparation method of silver sulfide/silver phosphate/graphene oxide composite photocatalyst

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Embodiment 1

[0022] Graphene oxide (GO) was prepared according to the improved Hummers method. GO was dispersed in deionized water and ultrasonically treated for 3 hours to obtain a GO suspension; 3 mmol of silver nitrate was weighed and dissolved in 8.5 ml of ethanol aqueous solution; and 1 mmol of phosphoric acid diphosphate was weighed Sodium hydrogen, dissolved in 8.5ml ethanol aqueous solution; under the condition of stirring, add the nitric acid solution dropwise to the sodium dihydrogen phosphate solution, and continue to stir for 30 minutes; then add 1ml 0.01 mol / L sodium sulfide solution dropwise, in Stir for 4 hours under dark conditions; add 10ml of graphene oxide suspension to the above solution, continue to stir for 3 hours, centrifuge the obtained reactant, wash with deionized water and ethanol for 5 times, and vacuum dry at 60°C for 12 hours to obtain silver sulfide / silver phosphate / graphene oxide composite photocatalyst.

Embodiment 2

[0024] Graphene oxide (GO) was prepared according to the improved Hummers method. GO was dispersed in deionized water and ultrasonically treated for 3 hours to obtain a GO suspension; weigh 4.2 mmol silver nitrate and dissolve it in 8.5 ml ethanol aqueous solution; then weigh 1.4 mmol Sodium dihydrogen phosphate, dissolved in 8.5ml ethanol aqueous solution; under the condition of stirring, add the nitric acid solution dropwise to the sodium dihydrogen phosphate solution, and continue stirring for 30 minutes; then add 1ml 0.01 mol / L sodium sulfide solution dropwise , stirred for 4h under dark conditions; 10ml of graphene oxide suspension was added to the above solution, and continued to stir for 3h, the obtained reactant was centrifuged, washed with deionized water and ethanol for 5 times, and dried in vacuum at 60°C for 12h to obtain Silver sulfide / silver phosphate / graphene oxide composite photocatalyst.

Embodiment 3

[0026] Graphene oxide (GO) was prepared according to the improved Hummers method. GO was dispersed in deionized water and ultrasonically treated for 3 hours to obtain a GO suspension; 8 mmol of silver nitrate was weighed and dissolved in 8.5 ml of ethanol aqueous solution; and 2.6 mmol of phosphoric acid was weighed Sodium dihydrogen, dissolved in 8.5ml ethanol aqueous solution; under the condition of stirring, add the nitric acid solution dropwise to the sodium dihydrogen phosphate solution, and continue to stir for 30min; then add 1ml 0.01 mol / L sodium sulfide solution dropwise, Stir under dark conditions for 4 hours; add 10ml of graphene oxide suspension to the above solution, continue to stir for 3 hours, centrifuge the obtained reactant, wash with deionized water and ethanol for 5 times, and vacuum dry at 60°C for 12 hours to obtain sulfurized Silver / silver phosphate / graphene oxide composite photocatalyst.

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Abstract

The invention relates to a preparation method of a silver sulfide / silver phosphate / graphene oxide composite photocatalyst, and belongs to the field of photocatalytic materials. The preparation methodis characterized in that an ethanol aqueous solution is used as a solvent. The preparation method comprises following steps: under strong agitation, respectively preparing a silver nitrate solution and a sodium dihydrogen phosphate solution; preparing graphene oxide according to an improved Hummers method, carrying out ultrasonic treatment to obtain a graphene oxide suspension, sequentially addingthe silver nitrate solution, a sodium sulfide solution and the graphene oxide suspension into the sodium dihydrogen phosphate solution, and carrying out centrifugal drying to obtain the silver sulfide / silver phosphate / graphene oxide composite photocatalyst. The preparation process is simple, raw materials are cheap and easy to obtain, the preparation period is short, and the prepared material isstable in chemical property. The photocatalyst prepared by the invention has photocatalytic activity in a relatively wide wavelength range, can be used for photocatalytic degradation of organic pollutants under visible light or natural light radiation, and has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to the preparation and application of a silver sulfide / silver phosphate / graphene oxide composite photocatalyst. Background technique [0002] In recent decades, with the rapid economic development, environmental problems, especially water pollution, have become a severe challenge that people face. Semiconductor photocatalysis technology has become one of the most promising technologies to solve environmental problems because it can use sunlight to degrade various organic and inorganic pollutants. Among various semiconductor photocatalysts, silver-based semiconductor photocatalytic materials have been widely used in recent years, silver phosphate (Ag 3 PO 4 ), with a suitable band gap, has attracted considerable attention due to its high photocatalytic activity in the photocatalytic degradation of organic pollutants driven by visible light. [0003] Ho...

Claims

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Application Information

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IPC IPC(8): B01J27/18C02F1/30C02F101/38
CPCB01J27/1817B01J27/055C02F1/30C02F2101/38C02F2305/10B01J35/39
Inventor 李贞玉刘涛龙丹范伊焘赵苾艺杨玉琴
Owner CHANGCHUN UNIV OF TECH
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