Abstract
Exploiting visible-light driven (VLD) heterojunction photocatalysts with high efficiency has attracted huge interest for photocatalytic environmental purification. Here we report a CdS/MnWO4 heterojunction as a high performance photocatalyst for methylene blue (MB) and methyl violet (MV) degradation under visible-light irradiation. Moreover, the CdS/MnWO4 sample with 0.3mmol and 0.5mmol CdS exhibited the highest photocatalytic activity for MB and MV degradation, respectively. This greatly enhanced photocatalytic activity is attributed to efficient separation of electron-hole pairs of heterojunction structure and strong visible light absorption of CdS. The active species generated during the process of MB degradation are investigated by series free radical scavenging experiments. Finally, the reusability of the photocatalyst was evaluated by five consecutive catalytic runs. This present study will benefit the development of transition metal tungstate based photocatalysts and would be a good candidate in meeting the environmental demands in the future.
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