The Preparation Of Graphene - Silver Compounds And Their Photocatalytic Performance Research

To enhance the catalytic property of silver-based materials, GO was prepared frompristine graphite according to Hummers’ method, then graphene-based silver hybridnanomaterials were synthesized via several facile methods. The morphologies andstructures were characterized, and the catalytic performance and mechanisms of thecomposites were investigated using RhB as model pollutant. The major contents can besummarized as follows:1. Synthesis of GO via Hummers method and its reductionGO was prepared from pristine graphite according to Hummers’ method, then RGOwas successfully prepared by a simply chemical reduction method using hydrazine hydrate,zero valent iron, ethylene glycol, and sodium hydroxide as reducing agent, respectively.The results suggested that hydrazine hydrate was the most suitable reducing agent.2. Synthesis and characterization of Ag-RGO by microwave-assisted methodAg-RGO nanocomposites were successfully prepared via a facile one-stepmicrowave-assisted method from GO and AgNO₃. The effects of the microwave power,microwave cycle time, and reactant ratio on its catalytic property were discussed. The bestphotocatalytic performance was observed at Ag-RGO prepared under30microwave cycles,400W from50mg GO and0.1g AgNO₃.3. Synthesis and characterization of Ag-RGO by hydrothermal methodAg-RGO nanocomposite was synthesized via a one-step hydrothermal method usingglucose as a reducing agent. A photodegradation study was also performed on theAg-reduced graphene oxide composite. It showed that the composite exhibited a highcatalytic activity for the photodegradation of Rhodamine B pollutant under visible-lightirradiation.4. Synthesis and catalytic property of Ag/AgBr/rGOAg/AgBr/rGO was synthesized via a facile solution-mixing method with GO, AgNO₃,CTAB as raw materials. The adsorptive and photocatalytic activities of the as-preparedsamples were also investigated by degradation of RhB under visible light irradiation. For our designed Ag/AgBr/rGO nanocomposite, the adsorptive and photocatalytic activitieswere both enhanced compared with pure Ag/AgBr.