二硫化钼量子点/还原氧化石墨烯复合材料的制备及其光催化 降解有机染料、四环素和 Cr (VI).

Molybdenum disulfide quantum dots/reduced graphene oxide (MoS2 QDs/rGO) composites were prepared by a one-pot solvothermal reduction method with sodium molybdate, L-cysteine and graphene oxide as raw materials. The photocatalytic degradation performance of photocatalysts was studied under visible light with rhodamine B (RhB), methylene blue (MB), tetracyclines (TC) and Cr (VI) as the target pollutants, respectively. MoS2 QDs/rGO composites exhibit excellent photocatalytic activity and stability that are superior to molybdenum disulfide quantum dots and reduced graphene oxide. The photodegradation rates of RhB, MB and Cr (VI) are all above 97%, and those of TC are 69%. Moreover, MoS2 QDs/rGO composites possess high photocatalytic stability and reusability and could be reused for ten times without significant decrease of photocatalytic activity. The photodegradation rates of the two dyes are both maintained over 90%. The photodegradation mechanism of MoS2 QDs/rGO composites is studied by adding radical scavengers of isopropanol, p-benzoquinone and EDTA-2Na, respectively. It is found that superoxide radical (·O2-) is the main active species of MoS2 QDs/rGO. [ABSTRACT FROM AUTHOR]