title: L-cysteine-assisted synthesis of hierarchical NiS2hollow spheres supported carbon nitride as photocatalysts with enhanced lifetime.
abstract: Novel hierarchical NiS2hollow spheres modified by graphite-like carbon nitride were prepared using a facile L-cysteine-assisted solvothermal route. The NiS2/g-C3N4composites exhibited excellent photocatalytic efficiency in rhodamine B, methyl orange and ciprofloxacin degradation as compared to single g-C3N4and NiS2, which could be due to the synergistic effects of the unique hollow sphere-like structure, strong visible-light absorption and increased separation rate of the photoinduced electron-hole pairs at the intimate interface of heterojunctions. A suitable combination of g-C3N4with NiS2showed the best photocatalytic performance. In addition, an electron spin resonance and trapping experiment demonstrated that the photogenerated hydroxyl radicals and superoxide radicals were the two main photoactive species in photocatalysis. A possible photocatalytic mechanism of NiS2/g-C3N4composites under visible light irradiation is also proposed. The strategy presented here can be extended to a general strategy for constructing 3D/2D heterostructured photocatalysts for broad applications in photocatalysis.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China.
authors.forename: Chengzhang
authors.initials: C
authors.lastname: Zhu
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Jiang
authors.forename: Linlin
authors.initials: L
authors.lastname: Chen
authors.forename: Kun
authors.initials: K
authors.lastname: Qian
authors.forename: Jimin
authors.initials: J
authors.lastname: Xie