预氧化聚丙烯腈/g-C3N4光催化降解罗丹明B

以聚丙烯腈(PAN)和g-C_3N_4为原料,采用超声波辅助分散的溶液浸渍法及煅烧法制备了具有共轭结构的预氧化聚丙烯腈/g-C_3N_4复合光催化剂(CPAN/g-C_3N_4),采用XRD、SEM、FTIR、UV-Vis DRS、EIS等技术对光催化剂进行了表征,考察了CPAN/g-C_3N_4对罗丹明B(Rh B)的可见光催化降解性能。结果表明:CPAN与g-C_3N_4具有良好的协同作用,使g-C_3N_4片状结构堆叠体颗粒显著减小,明显增强了光催化剂在全部光谱范围内的光吸收,有效提高了光生电子-空穴分离效率;在PAN与g-C_3N_4质量比为1∶200、煅烧温度250 ℃、煅烧时间1 h条件下所制备的CPAN/g-C_3N_4光催化活性最高,且具有良好的光催化活性稳定性。超氧自由基和光生空穴为CPAN/g-C_3N_4复合光催化剂光降解罗丹明B的主要活性物种。

Photocatalytic degradation of rhodamine B by pre-oxidized polyacrylonitrile/g-C3N4

Using polyacrylonitrile （PAN） and g-C₃N₄ as raw materials,the CPAN/g-C₃N₄ composite photocatalyst with conjugated structure was prepared by combination of ultrasonic-assisted solution impregnation method and calcination method. The prepared photocatalyst was characterized by XRD,SEM,FTIR,UV-Vis DRS and EIS,and its photocatalytic performance to rhodamine B under visible light was evaluated. The results show that：Due to the good synergistic effect between CPAN and g-C₃N₄,the size of the g-C₃N₄ lamellar stacking particles is significantly reduced,the light absorption over the full spectrumthe of the photocatalyst is obviously enhanced,and the separation efficiency of photogenerated electrons/holes is effectively improved;Under the conditions of mass ratio of PAN to g-C₃N₄ 1∶200,calcination temperature 250 ℃ and calcination time 1 h,CPAN/g-C₃N₄ with the highest photocatalytic activity and good stability was prepared. It can be found that superoxide radicals and photogenerated holes are the major active species for photodegradation of rhodamine B by the CPAN/g-C₃N₄ composite photocatalyst.