Study On Preparation And Photocatalytic Properties Of Modified Cyclized Polyacrynitrile

The polyacrylonitrile?PAN?/SiO₂ was synthesized by aqueous deposited polymerization using acrylonitrile and nano-silica as raw materials.The cyclized polyacrylonitrile?CPAN?/SiO₂ composite material was obtained by heat treatment method.Then,the porous-CPAN material was obtained by bath method for removing the nano-silica.Furthermore,CPAN/SiO₂ and porous-CPAN materials were characterized by FTIR,BET specific surface area,SEM,PL,HPLC and XPS.Photocatalytic activities of CPAN/SiO₂ and porous-CPAN materials were investigated systematically with RhB as model pollution under visible light irradiation.The results show that CPAN/SiO₂ and porous-CPAN possess highly specific surface area,absorption,photocatalytic performances and excellent stability compared with CPAN.The carriers scavenger experiment indicated that the superoxide radicals might be the main active species in RhB photodegradation.Novel plasmonic photocatalysts CPAN/Ag@AgCl were synthesized via a facile ion exchange and situ-precipitation method respectively.The crystal structure,morphology,chemical composition and photoelectrochemical property of CPAN/AgCl@Ag composites were characterized by XRD?SEM?TEM?XPS?FTIR?UV-vis?DRS??PL?EIS and PT.Photocatalytic activities of CPAN/Ag@AgCl material were investigated systematically with MO as model pollution under visible light irradiation.The results show that the photocatalytic activity and stability of CPAN/Ag@AgCl composites were improved significantly.The carriers scavenger experiment indicated that the photogenerated holes and superoxide radicals might be the main active species in MO photodegradation.Cyclized polyacrynitrile?CPAN?and CdS materials were prepared using a simple chemisorption and heat-treatment approach.The as-prepared composites were characterized by XRD,SEM,TEM?HRTEM?,FTIR,XPS,UV-vis DRS,PL,EIS,etc.,and their visible-light photocatalytic performances were investigated by evaluating the photodegradation of methyl orange solutions under visible light irradiation.The results show that the size of CPAN/CdS is about 5 nm.CPAN on CPAN/CdS?1:50?surface might exist with the monomolecular layer,which can significantly enhance the absorption of CdS in the range of 500-800 nm and separation efficiency between the photogenerated electron/hole pairs in the composites.The as-prepared composites exhibit much higher visible-light photocatalytic activity than pure CdS and excellent photocatalytic stability.