Bacterial deactivation by cell-wall rupturing is widely described. Complete mineralization of both aqueous gram-positive Staphylococcus aureus and gram-negative Klebsiella pneumoniae , leaving no organic species, is described here for the first time. Solar-simulated radiation (with ~ 5% UV), with ZnO nanoparticle photocatalyst, is used. In addition to complete bacterial deactivation (~ 100%), their mineralization is achievable with time. Both bacteria, with thick and thin peptidoglycan layers, are mineralized. In thicker walled S. aureus, ~ 72% mineralization is achievable, while in thinner walled K. pneumoniae , mineralization is ~ 85%. Anthocyanin-sensitized ZnO shows higher catalytic efficiency under purely visible light, while pristine ZnO particles are more effective under simulated solar radiation. The results show the feasibility of using direct solar radiation in photocatalytic water disinfection without the need to use other more costly and hazardous methods. The study is especially useful to many societies having limited access to safe drinking water.

中文翻译：

---

氧化锌在紫外线和可见光辐射下光催化去除水中的金黄色葡萄球菌和肺炎克雷伯菌

细胞壁破裂导致的细菌失活被广泛描述。这里首次描述了水性革兰氏阳性金黄色葡萄球菌和革兰氏阴性肺炎克雷伯菌的完全矿化，不留下有机物种。使用带有 ZnO 纳米粒子光催化剂的太阳模拟辐射（约 5% 紫外线）。除了完全的细菌失活 (~ 100%)，随着时间的推移，它们的矿化是可以实现的。两种具有厚厚和薄肽聚糖层的细菌都被矿化。在壁厚较厚的金黄色葡萄球菌中，可实现约 72% 的矿化，而在壁较薄的肺炎克雷伯菌中，可实现约 85% 的矿化。花青素敏化的 ZnO 在纯可见光下表现出更高的催化效率，而原始 ZnO 颗粒在模拟太阳辐射下更有效。结果表明在光催化水消毒中使用直接太阳辐射的可行性，而无需使用其他更昂贵和危险的方法。这项研究对许多获得安全饮用水的机会有限的社会特别有用。