碳纳米管@球形氮化碳核壳结构光催化剂的构筑及其性能

Construction of CNT@CNMS Core-Shell Structure Catalyst and Its Photocatalytic Degradation Properties

以二氰二胺、三聚氯氰和碳纳米管(CNT)为原料,采用溶剂热法制备了一系列以CNT为核、不同CNT添加量的碳纳米管@球形氮化碳(CNT@CNMS)核壳结构可见光响应的催化剂。采用XRD、FT-IR、TEM、XPS、紫外可见光谱(UV-vis)、电化学阻抗(EIS)和光致发光光谱(PL)等分析方法对催化剂的结构、性能进行了表征。通过电化学表征计算出CNMS的价带与导带位置。结果表明,CNMS均匀的生长到管状CNT表面,形成CNT@CNMS核壳结构;制备的CNT@CNMS核壳催化剂比表面积增大,且可见光吸收性能明显增强。光催化性能实验表明,当CNT质量为20 mg时,制备的催化剂光催化活性最高,反应120 min,4-硝基苯酚的降解率高达54.44%,其降解效果明显高于CNMS。

A series of visible light-responsive carbon nanotubes@spherical carbon nitride(CNT@CNMS)core-shell catalysts with different CNT contents were successfully synthesized by the solvothermal method using dicyandiamide and cyanuric chloride as raw materials and carbon nano tubes(CNT)as the core.The prepared photo catalyst was characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),transmission electron microscope(TEM),UV-vis.diffuse reflectance spectroscopy(DRS),X-ray photoelectron spectroscopy(XPS),electrochemical impedance(EIS)and photoluminescence(PL)spectroscopy.Valence band(VB)and conduction band(CB)of CNMS were calculated by electrochemical characterization.The results indicated that CNMS grows evenly on the surface of tubular CNTs to form CNT@CNMS core-shell structure.The prepared CNT@CNMS core-shell catalyst has a larger specific surface area and enhanced visible light absorption performance.Moreover,the photo catalytic activity of CNT@CNMS core-shell catalysts was evaluated based on the degradation of 4-nitrophenol,and the optimal CNT content with the highest photo catalytic activity was determined to be 20 mg,and its degradation efficiency was 54.44%significantly higher than CNMS.This study provides a theoretical basis for the preparation of core-shell structured carbon nitride catalysts by solvothermal methods.