NiO/g-C_3N_4异质结光催化剂的制备及可见光降解印染废水研究

Synthesis of mesoporous heterostructured NiO/g-C_3N_4 photocatalyst and degradation of printing and dyeing wastewater by visible light

利用氨蒸发法成功制备出NiO/g-C_3N_4异质结光催化剂,采用X射线衍射(XRD)、红外光谱(FT-IR)、比表面积(BET)、扫描电镜(SEM)、光致发光光谱(PL)等手段分析了光催化剂的理化性能,结果表明,NiO/g-C_3N_4为蜂窝状复合介孔结构。以罗丹明B(RhB)作为目标降解物,考察了复合光催化剂在可见光下的催化性能,相比g-C_3N_4,NiO/g-C_3N_4异质结光催化剂的催化活性有了较大提升,主要归因于:(1)更大的比表面积;(2)异质结结构抑制了光生电子-空穴的复合。

NiO/g-C3N4 heterostructured photocatalyst had been successfully prepared via ammonia-evapo- ration-induced method.The samples were characterized by XRD,FT-IR,BET,SEM and PL.The results revealed that NiO/g-C3N4 had honeycomb-like composite mesoporous structure.The catalytic activity of photocatalyst was evaluated by the degradation of Rhodamine B (RhB)under visible light irradiation.The results showed that compared with pure g-C3N4,the NiO/g-C3N4 composite exhibited enhanced photocatalytic activity for degradation of the RhB under.visible light irradiation.The enhanced photocatalytic performance of the composite was mainly attributed to high BET specific surface area and the efficient inhibition of heterostructure to photo-generated electron-hole pair recombination.