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Optimizing the synergistic effect of CuWO4/CuS hybrid composites for photocatalytic inactivation of pathogenic bacteria
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-10-04 , DOI: 10.1039/d2en00361a Xiuli Dong 1 , Rowan R. Katzbaer 2 , Basant Chitara 1 , Li Han 3 , Liju Yang 4 , Raymond E. Schaak 2 , Fei Yan 1
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-10-04 , DOI: 10.1039/d2en00361a Xiuli Dong 1 , Rowan R. Katzbaer 2 , Basant Chitara 1 , Li Han 3 , Liju Yang 4 , Raymond E. Schaak 2 , Fei Yan 1
Affiliation
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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.
中文翻译：
优化CuWO4/CuS杂化复合材料光催化灭活病原菌的协同作用
在此，我们报道了一种最大化CuWO 4 /CuS杂化复合材料的抗菌活性的有效策略，该复合材料通过简单地将不同重量比的CuWO 4和CuS纳米粉末在磷酸盐缓冲盐溶液中通过超声混合而制备。测试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CuWO 4相比，所制备的复合材料表现出显着增强的抗菌效率白光照射下的CuS纳米粉体。棋盘式阵列分析表明，8 μg mL -1 CuWO 4和 2 μg mL -1 CuS 的组合是最有效的，产生了最佳的协同效应，对来自 3 个菌株的所有测试细菌显示出完全杀灭效果，约为 5.8对数单元减少。显着提高的催化效率可归因于 CuWO 4之间形成 II 型异质结。CuS，可有效提高电荷分离效率，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CuWO 4和CuS界面的电荷迁移和转移。这项研究为整合不同半导体以优化它们对水消毒抗菌活性的协同作用提供了新的见解。
更新日期：2022-10-04
中文翻译：
优化CuWO4/CuS杂化复合材料光催化灭活病原菌的协同作用
在此，我们报道了一种最大化CuWO 4 /CuS杂化复合材料的抗菌活性的有效策略，该复合材料通过简单地将不同重量比的CuWO 4和CuS纳米粉末在磷酸盐缓冲盐溶液中通过超声混合而制备。测试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CuWO 4相比，所制备的复合材料表现出显着增强的抗菌效率白光照射下的CuS纳米粉体。棋盘式阵列分析表明，8 μg mL -1 CuWO 4和 2 μg mL -1 CuS 的组合是最有效的，产生了最佳的协同效应，对来自 3 个菌株的所有测试细菌显示出完全杀灭效果，约为 5.8对数单元减少。显着提高的催化效率可归因于 CuWO 4之间形成 II 型异质结。CuS，可有效提高电荷分离效率，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CuWO 4和CuS界面的电荷迁移和转移。这项研究为整合不同半导体以优化它们对水消毒抗菌活性的协同作用提供了新的见解。
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