Fabrication of Unique and Green Tin(IV) Sulfide/Moss Photocatalyst for Highly Effective Photocatalytic Reduction of Cr(VI)

摘要

We report a simple and green method for fabricating SnS2 modified moss composites for removal of heavy metal (Cr(VI)) considering the fact that the issue of wastewater caused by the discharge of heavy metal is becoming increasingly serious. More importantly, this kind of functional materials that are capable of removing effectively Cr(VI) from wastewater for water purification is quite few on the market. Hence, in the paper, such SnS2 decorated moss photocatalysts for removal of heavy metal (Cr(VI)) were designed and prepared via a simple and green method: chemical bath reaction. The as-designed materials (C@SnS2) integrate the independent properties of moss (with excellent performance in absorption of heavy metal) and SnS2 (with good photocatalytic reduction of Cr(VI) under visible light irradiation), showing a faster photocatalytic rate than those independent components. The experiment results indicate that more than 98.5% of Cr(VI) was reduced under visible light irradiation for 70 min, while only 18.2% and 84.4% of Cr(VI) were removed in the presence of C-moss and pure SnS2 at the same condition, respectively. Furthermore, the as-designed C@SnS2 has good recyclability in the removal of Cr(VI). We believe such simple and green method to prepare photocatalyst for wastewater treatment with excellent performance will provide a good platform to design new photocatalytic materials for water purification.