Based On The Preparation Of Graphene Gel And Its Application In The Treatment Of Pollutants In Water

Since the graphene materias were discovered,due to its unique structure and excellent performance,it has attracted extensive attention from researchers.The preparation method of graphene is also gradually matured.The rich surface area and excellent electrical conductivity of graphene make it the best choice for catalyst carriers.Many reports have shown that graphene surfaces modified with nanoparticles can greatly ehance the catalytic properties of materials.Moreover,graphene could improve the aggregation phenomenon of catalyst nanoparticle.Therefore,composite materials based on graphene have certain practical significance and prospect for the research of wastewater treatment.1)The rGS/Fe₃O₄-Pd aerogel materials were successfully prepared by hydrothermal method and high-temperature calcination.The structure and composition of the materials were characterized by XRD,FT-IR and XPS.The introduction of Pd nanoparticles and Fe₃O₄ nanoparticles in aerogelsgives good catalytic and magnetic properties for the aerogel materials.The typical reduction of 4-nitrophenol was chosen as molder reaction to evaluate the catalytic performace of rGS/Fe₃O₄-Pd aerogel.The experimental results show that the rGS/Fe₃O₄-Pd aerogel material exhibited better catalytic performance than the commercial Pd/C material with the same Pd laoding.Due to the corporation of magnetic Fe₃O₄ nanoparticles in the graphene aerogel,the aerogel could be separated from the reaction system under the external magnetic field,so the rGS/Fe₃O₄-Pd aerogel material has good recycling property.2)One-step hydrothermal method was used to prepare Fe₂O₃/rGO aerogel materials.The obtained Fe₂O₃/rGO aerogels exhibit extensive pore structure?macropores and mesopores?,so that it has excellent adsorption capacity.In order to evaluate the degradation effect of Fe₂O₃/rGO aerogel on organic dyes in wastewater,this experiment used a mild,green and efficient photo-Fenton system to degrade Rhodamine B.The influence factors on degradation efficiencies,such as Rhodamine B concentration,catalyst dosage and H₂O₂ dosage were investigated in detail.A possible degradation mechansim was also proposed.