Based On Gel System Of The Synergistic Behavior Of Adsorption And Photocatalysis

Graphene hydrogels feature three-dimensional porous networks with high specific surface areas,low densities and well-developed interpenetrating pore structures.3-dimensional-assembled rGH macrostructures exhibit new collective physiochemical properties together with excellent sorption capability and recyclability,being potentially applicable for adsorption and removal of organic pollutants,marine oil spills,and heavy metal ions.This study describes the encapsulation of AgBr by reduced graphene oxide?rGO?to form a composite?AgBr@rGO?that can be incorporated into reduced grapheme hydrogel?rGH?to form rGH-AgBr@rGO.The core-shell structure of AgBr@rGO inhibited the growth of AgBr particles,while hybridization with graphene promoted the rapid migration and separation of photogenerated charges.The obtained results revealed a superior synergy between photocatalytic and adsorption-based pollutant degradation by rGH-AgBr@rGO.The degradation of BPA was up to 100%within 90 min,which was1.5 times that of monomeric AgBr,exhibiting values above 90%after five cycles.In the further study,polyaniline?PANI?/TiO₂-reduced grapheme oxide hydrogel?PANI/TiO₂-rGH?composite hydrogel was successfully prepared by chemical reduction method.PANI acted as the spacer,while increasing the strength of hydrogel,the presence of conductive polymer PANI also plays a role in the transmission of charge.Specifically,80%PANI/TiO₂-rGH can completely degrade contaminants in 40 min,and almost completely mineralized into small molecules in 65 min.After five cycles of experiments,the degradation rate was more than 90%.Hydrogen bonding between TiO₂ and rGH is explained by XPS.Based on the quenching experiments described in the degradation of pollutants,·O₂^-and h⁺were the main active species.Moreover,the micron-sized three-dimensional mesh structure could be regenerated using a simple filter without the need for a complex catalyst filtration system.