期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 284, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.120207
关键词
Photocatalysis; S-scheme; Ternary heterojunction; W@ZIS/Bi2S3; Hexavalent chromium
资金
- National Natural Science Foundation of China [21576211]
- Tianjin Science and Technology Program [21ZYJDJC00100]
- Program for Tianjin Innovative Research Team in Universities [TD13-5031]
- Tianjin 131 Research Team of Innovative Talents
A new type of hierarchical dual S-scheme heterojunction, W@ZIS/Bi2S3, was designed for the efficient photocatalytic elimination of Cr (VI) by facilitating charge migration and spatial separation. The optimized composite exhibited excellent adsorption and photocatalytic capacity, achieving a high reduction efficiency of Cr (VI). The study provides new insights into the working mechanism of ternary heterojunctions.
Herein, a new type of hierarchical dual S-scheme heterojunction, W@ZIS/Bi2S3, was well-designed for the photocatalytic elimination of Cr (VI). In order to prevent the fast recombination of photoinduced electron-hole pairs, ZnIn2S4 , as a bridge has a strong interaction with both WO3 and Bi2S3, facilitating charge migration and spatial separation for accuracy regulation of redox centers, simultaneously promoting the catalytic oxidation and the reduction capability. The optimized W@ZIS/Bi2S3 composite, with the hierarchical structure, larger surface area and numerous nanoscale active sites, exhibited excellent adsorption and photocatalytic capacity. High efficiency (100%) of Cr (VI) (10 mg/L) reduction could be obtained within 30 min, with its photocatalytic rate ratio about 8.09 times higher than pure ZnIn2S4 and 2.04 times higher than W@ZIS-1.4, respectively. The optimized W@ZIS/Bi2S3 composite exhibited perfect stability and recyclability. Meanwhile, the promoted activity of TC oxidation has also been obtained. Dual S-scheme heterojunction and hierarchical structure provided a promising general method for catalyst design, giving new insights into the working mechanism of ternary heterojunction.
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