Study On Visible-light Photocatalytic Ability Of G-C₃N₄ Modified By Derivatives Of PVC

A facile method has been developed to prepare an efficient visible-light photocatalyst using g-C₃N₄ and ordinary polyvinyl chloride?PVC?as main precursors.Firstly,g-C₃N₄ was dispersed into PVC solution with tetrahydrofuran as solvent.Secondly,the above suspension containing g-C₃N₄ was heated at 50 ? to obtain PVC/g-C₃N₄ composite via solvent volatilization.Finally,the product was heated at 150 ? for 2 h,which made the surface of PVC take off HCl to be conjugated polymer/g-C₃N₄?DPVC/g-C₃N₄?.The as-prepared photocatalyst was characterized by Scanning electron microscopy?SEM?,UV-visible diffuse reflectance spectroscopy?UV-Vis DRS?,X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?,Raman Spectroscopy,photoluminescence spectroscopy?PL?,Electrochemical Impedance Spectroscopy?EIS?,et al.The results showed the crystallization of g-C₃N₄ modified by DPVC didn't change obviously,The absorption DPVC/g-C₃N₄ composites increased in the visible region,the surface of g-C₃N₄ exist conjugated polymer.The photocatalytic activity of the as-prepared photocatalyst was evaluated by photodegradation of Rhodamine B?RhB?solution under visible-light irradiation.Discussing some Preparation conditions such as mass ratio.of PVC and g-C₃N₄?the temperature of thermal-treatment?the time of thermal-treatment and so on,had an influence on the photocatalytic ability of DPVC/g-C₃N₄ composites under visible light.The results showed when mass ratio of PVC and g-C₃N₄ was 1:300,the temperature of thermal-treatment was 150? and the time of thermal-treatment was 2h,the photocatalytic ability of DP VC/g-C₃N₄ composites was the best.By the experiment of adding capture agent,analyzing the active centre of photocatalytic degradation of DPVC/g-C₃N₄ composites for Rhodamine B,and discussing the visible-light photocatalytic mechanism.Results show that the in the process of photocatalytic degradation of DPVC/g-C₃N₄ composites for Rhodamine B,photoproduction electron and hole work at the same time,and photoproduction hole is the main role.