Heterogeneous ZnS-zinc carbonate hydroxide micro-belts for Cr(vi) reduction under simulated sunlight

Heterogeneous ZnS-zinc carbonate hydroxide (ZnS-ZCH) micro-belts were facilely synthesized and the composite belts displayed a dramatic enhancement in response to simulated sunlight as indicated by more than seventy- and four-fold increase in the Cr(vi) photo-reduction rate compared with those of ZCH and commercial titanium dioxide (Degusa P25), respectively. The structure, composition and optical properties were investigated by a series of methods and the results indicated an enhanced separation of holes and electrons as well as a decrease in the band gap due to the existence of ZnS. The promoted photo-activity could be ascribed to the high utilization of light due to the existence of ZnS with small particles, high dispersion in the composite and porous structure.

Automated summary

Heterogeneous ZnS-zinc carbonate hydroxide micro-belts were synthesized, and they exhibited significantly enhanced photocatalytic performance. The presence of ZnS promoted the separation of electrons and holes, leading to improved photo-activity and efficient light utilization.