Journal
CHEMOSPHERE
Volume 286, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131738
Keywords
CdS/ZnO heterojunction; Graphene; Photocatalytic; Hexavalent chromium; Wastewater
Categories
Funding
- National Natural Science Foundation of China, China [22078028, 21978026, 21676030]
- Changzhou Key Laboratory of Graphene-Based Materials for Environment and Safety, China [CM20153006, CE20185043]
- PAPD of Jiangsu Higher Education Institution, China [KYCX21_2795]
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This study aims to optimize the conformation of nanocomposite for enhancing the photocatalytic removal of heavy metal contaminants, with ZnO/CdS6:5/RGO(6) showing strong recycling performance.
The removal of toxic and harmful heavy metal contaminants from wastewater is of great importance for global environmental health. The development of efficient photocatalysts is attracting increasing interest with a current focus on material design for improved efficiency. Accordingly, this study aims to optimize the conformation of nanocomposite prepared from a CdS/ZnO heterojunction on reduced graphene oxide (RGO) for boosting the photocatalytic removal of heavy metal contaminants of aqueous systems. Under visible light, the candidate nanocomposites exhibited a range of photocatalytic activity in reducing hexavalent chromium [Cr(VI)] to trivalent chromium [Cr(III)] at room temperature. Among these different nanocomposites, the photocatalytic removal rate constant of Cr(VI) ranged as follows: ZnO/CdS6:5/RGO(6) (0.106 min(-1)) > ZnO/CdS6:5 (0.0630 min(-1)) > CdS (0.0335 min(-1)) > ZnO (0.00121 min(-1)). Moreover, after five cycles of use, the photocatalytic reduction rate of ZnO/CdS6:5/RGO(6) was 93.2 %, which signifies its strong re-cycling performance. These results reveal the feasibility of using CdS/ZnO6:5/RGO(6) to reduce heavy metal ions from wastewater and provide insights for efficiently removing heavy metal ions without additional chemical trapping agents in the photo catalytic process.
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