Photocatalytic degradation of rhodamine B by carbon-deficient carbon nitride controlled by elemental bismuth
In order to enhance the photocatalytic performance of graphite phase carbon nitride(CN),the carbon-deficient carbon nitride controlled by elemental bismuth(Bi-V-CN)was synthesized by chemical reduction method after introducing carbon vacancies into CN using defect engineering.And the composite was characterized by XRD、SEM、XRD、FTIR、XPS、PL and EIS.Bi-V-CN was synthesized for photocatalytic degradation of rhodamine B(RhB).The visible light response of the catalyst was improved greatly after the introduction of elemental bismuth.When the mass fraction of bismuth nitrate introduced was 0.5％,the removal rate of RhB reached 99.7％after 25 min of irradiation with dosage of 1 mg/mL under the condition of 20 mg/L RhB.The introduction of bismuth and carbon defects not only increased the specific surface area of CN,provided more active site for photocatalytic reaction,but also reduced the band gap of CN,promoted the effective separation of photogenerated electrons and holes,so as to improve the photocatalytic performance of CN.The quenching experiments of active species showed that h+and·O2-were the main active species in the catalytic degradation of Bi-V-CN,respectively.
carbon nitridebismuth loadingcarbon defectsphotocatalysisrhodamine B
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维普
