Photocatalytic Study Of Cds/AgBr-rGO Three-way Catalyst On RhB Degradation And Cr(?)Reduction

Organic dye wastewater pollution and chromium?Cr?ion pollution are major challenges facing the environmental field in the 21st century.Rhodamine B?RhB?is widely used as an organic dye in the textile industry,causing eutrophication and disturbance to aquatic organisms.Chromium?Cr?is widely used in industrial production and is a ubiquitous metal element in nature,of which hexavalent chromium?Cr????is hundreds of times more toxic than trivalent chromium(Cr?III?.At the same time,hexavalent Chromium is easy to accumulate in the human body,causing human-related diseases and threatening public health.The current methods of treating rhodamine B?RhB?and chromium?Cr?in wastewater mainly include adsorption,advanced oxidation,photodegradation and microbial degradation.The semiconductor photocatalysis technology has the best effect and is conducive to the complete degradation of pollutants,so it has been developed as the most advantageous technology in the field of environmental remediation.In recent years,the formation of a Z-type structure by various semiconductor materials has attracted great attention.This structure can accelerate the electron and hole transport rate of semiconductors,inhibit the combination of electrons and holes,and thereby strengthen the ability of redox.In this paper,the Cd S/AgBr-r GO ternary composite photocatalyst material was successfully prepared by hydrothermal method,and the prospect of rapid degradation of rhodamine B and reduction of Cr???was realized.The main research results are as follows:?1?Synthesis and characterization of CdS/AgBr-?GO nanomaterials.CdS/AgBr-?GO ternary composite catalyst was synthesized by hydrothermal method.The CdS/AgBr-?GO ternary composite photocatalyst materials were characterized by XRD,SEM,TEM,XPS,UV-DRS,PL,BET,ESR and electrochemistry.The results showed that the flake ?GO was successfully combined with spherical AgBr,and grew on rod-like CdS.?2?Photocatalytic degradation of rhodamine B by CdS/AgBr-r GO nanomaterialsIn the RhB photocatalytic oxidation degradation experiment,explore the optimal ratio of CdS,AgBr,?GO,the optimal amount of photocatalyst in the reaction system,and the photocatalytic reaction oxidation mechanism;The experimental results show that CdS/AgBr-?GO?mass ratio of 10:1:0.01?exhibits the best photocatalytic activity,and its first-order kinetic degradation coefficients for degrading RhB are 1.96 and 5.67 times that of CdS and AgBr,respectively;Characterized by electrochemistry and PL,the results show that CdS/AgBr-?GO?mass ratio 10:1:0.01?exhibits the strongest photocurrent and the lowest PL peak,that is,the electron transfer efficiency is high and the electrons and holes are separated quickly,this result is consistent with the experimental results of photocatalytic redox reactions.At the same time,the results of ESR and quenching experiments show that the Cd S/AgBr-?GO three-way catalyst will generate.O₂^-?.OH radicals during the degradation of rhodamine B.?3?Photocatalytic reduction of Cr???by CdS/AgBr-r GO nanomaterialsIn the Cr???photocatalytic reduction experiment,the optimal dosage of the photocatalyst in the reaction system and the mechanism of the photocatalytic reduction reaction were explored.The experimental results show that CdS/AgBr-?GO?mass ratio of 10:1:0.01?has the strongest reduction ability,and the reduction degradation ability is100%within 40 minutes.From the above research results,it can be shown that the ternary Z-type photocatalyst CdS/AgBr-?GO constructed by the hydrothermal method showed excellent photochemistry in the process of photocatalytic degradation of rhodamine B and reduction of Cr???.ability.Therefore,new methods are introduced to improve the water environment.