Optimizing the synergistic effect of CuWO 4 /CuS hybrid composites for photocatalytic inactivation of pathogenic bacteria
Optimizing the synergistic effect of CuWO 4 /CuS hybrid composites for photocatalytic inactivation of pathogenic bacteria
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优化CuWO 4 /CuS杂化复合材料光催化灭活病原菌的协同效应
DOI：
10.1039/d2en00361a
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yan, Fei
中科院分区：
文献类型：
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作者：
Dong, Xiuli;Katzbaer, Rowan R.;Chitara, Basant;Han, Li;Yang, Liju;Schaak, Raymond E.;Yan, Fei
在此，我们报告了一种有效策略，可最大限度地提高 CuWO4/CuS 杂化复合材料的抗菌活性，该复合材料是通过超声简单地将不同重量比的 CuWO4 和 CuS 纳米粉末在磷酸盐缓冲盐溶液中混合而制备的。检测的细菌包括革兰氏阴性（G-）致病菌伤寒沙门氏菌、革兰氏阳性（G+）致病菌金黄色葡萄球菌和G+细菌枯草芽孢杆菌。与单独的 CuWO4 和 CuS 纳米粉末相比，所制备的复合材料在白光照射下表现出更高的抗菌效率。棋盘阵列分析表明，8 μg mL−1 CuWO4 和 2 μg mL−1 CuS 的组合是最有效的，并产生最佳的协同效应，对 3 个菌株的所有测试细菌显示出完全杀灭作用，细胞减少量约为 5.8 log。催化效率的显着提高可归因于CuWO4和CuS之间形成II型异质结，这可以有效提高电荷分离效率并增加光吸收。此外，超声辅助物理混合制备的杂化复合材料可以有效增加界面面积，极大地促进了CuWO4和CuS界面上的电荷迁移和转移。这项研究为不同半导体的集成提供了新的见解，以优化它们对水消毒抗菌活性的协同效应。
Herein, we report an effective strategy to maximize the antimicrobial activity of CuWO4/CuS hybrid composites, prepared by simply mixing CuWO4 and CuS nanopowders with varying weight ratios in phosphate buffered saline solution by ultrasound. The tested bacteria included Gram negative (G−) pathogenic bacteria Salmonella typhi, Gram positive (G+) pathogenic bacteria Staphylococcus aureus, and G+ bacteria Bacillus subtilis. The as-prepared composites exhibited much enhanced antibacterial efficiency compared with individual CuWO4 and CuS nanopowders under white light irradiation. The checkerboard array analysis revealed that the combination of 8 μg mL−1 CuWO4 and 2 μg mL−1 CuS was the most efficient and generated the optimal synergistic effect, showing a complete killing effect on all the tested bacteria from 3 strains with ∼5.8 log cell reduction. The significantly enhanced catalytic efficiency can be ascribed to the formation of a type-II heterojunction between CuWO4 and CuS, which can effectively improve the charge separation efficiency and increase the light absorption. Moreover, the hybrid composites prepared by ultrasound-assisted physical mixing can effectively increase the interface area, which greatly facilitates the charge mobility and transfer in the interfaces between CuWO4 and CuS. This study offers new insights into the integration of different semiconductors to optimize their synergistic effect on antimicrobial activities for water disinfection.