Mechanochemical preparation of Z-scheme CdIn2S4/Zn-Al LDH heterojunction with enhanced photocatalytic performance for SIPX degradation
Source abstract
Abstract
In this study, the CdIn 2S 4/Zn-Al LDH composite with Z-scheme heterojunction was successfully prepared by a simple mechanochemical method, showing excellent visible-light photocatalytic performance for the degradation of sodium isopropyl xanthate (SIPX) which is a kind of typical organic pollutant in flotation sewage. A number of analytical techniques were used to characterize the as-proposed materials, whereby to systematically and comprehensively investigate the photocatalytic mechanism of CdIn 2S 4/LDH composites. It was proved that the photo-response range of the composites were effectively broadened due to the presence of the Z-scheme heterojunction, with improved solar utilization rate to eventually realize the efficient separation and migration of photo-generated charges and enhancement of photocatalytic activity. Results confirmed the degradation efficiency of CdIn 2S 4/LDH composites on SIPX under visible light was significantly improved compared with pure Zn-Al LDH and pure CdIn 2S 4. The photocatalytic degradation rate of SIPX with an initial concentration of 20 mg/L by 20 mg of 15 wt%CdIn 2S 4/LDH composite was over 90 % within 180 min under visible light, and its apparent reaction rate constant was 13.4 times and 3.0 times that of pristine LDH and pure CdIn 2S 4, respectively. ESR results further revealed the predominant role of ∙ O 2 − during photocatalytic degradation reaction. This study not only provides an innovative idea for the synthesis and application of CdIn 2S 4/LDH composite photocatalyst, but also offers an alternative strategy for the efficient and green treatment of xanthate-containing wastewater. Findings here may also be a beneficial reference for the establishment and development of other photocatalytic systems, possibly promoting the application and development of photocatalysis technology in the field of environmental protection.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Luminescence Properties of Advanced Materials · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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