Study on photoelectric performance analysis of g-C3N5 nanorods and removal of Cr(Ⅵ)and methylene blue
In order to achieve green and efficient degradation of Cr(Ⅵ)and dye wastewater,one-dimensional nitrogen-rich graphite phase carbon nitride nanorods(1D g-C3N5)with excellent photocatalytic activity were prepared by KBr-induced method.The crystal structure,group,morphology,photochemical properties and electrochemical properties of 1D g-C3N5 were characterized by XRD,FT-IR,TEM,UV-vis DRS,PL,TPC and EIS.The photocatalytic removal of Cr(Ⅵ)and degra-dation of methylene blue(MB)under visible light were evaluated.The results showed that the specific surface area of the material was increased by the KBr-induced morphology control method,the spectral absorption range was broadened,the visible light absorption and conversion ability was improved,and the separation of photogenerated carriers was effectively promoted,showing a lower surface/interface resistance value.The photocatalytic activity of 1D g-C3N5 was significantly im-proved compared with bulk g-C3N5.After visible light irradiation for 60 min,the removal rate of Cr(Ⅵ)and the degradation rate of MB by 1D g-C3N5 reached 97.6%and 98.8%,respectively.Moreover,1D g-C3N5 still had good stability after 5 cycles.The results of the active groups showed that the main active groups of the photocatalytic system were·O2-and h+,the removal of Cr(Ⅵ)benefited from the effect of e-.The photocatalytic mechanism of 1D g-C3N5 photocatalytic reduction of Cr(Ⅵ)and removal of MB was proposed by band structure calculation.
KBr induction1D g-C3N5photocatalysisCr(Ⅵ)methylene blue
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