Ag Nanoparticle and Ti–MOF Cooperativity for Efficient Inactivation of E. coli in Water,ACS Applied Materials & Interfaces

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Ag Nanoparticle and Ti–MOF Cooperativity for Efficient Inactivation of E. coli in Water
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-10 , DOI: 10.1021/acsami.3c08069
Xudong Sun _{1,

2,

3} , Wenhao Pan _{1,

2,

3} , Gege Wang _{1,

2,

3} , Siyu Liu _{1,

2,

3} , Yong Zhang _{1,

2,

3} , Jian Huang _{1,

2,

3} , Hua Zhang _{1,

2,

3} , Jinhua Wang _{1,

2,

3} , Shanshan Xi _{1,

2,

3} , Tao Luo _{1,

2,

3}

Affiliation

Because of the limitations of traditional chlorine-based bactericidal water treatment, such as the formation of disinfection byproducts (DBPs) and resistance to chlorine, novel approaches and materials are required for effective disinfection of water. This study focuses on the development of a new sterilization material, Ag/NH₂-MIL-125(Ti), which was designed to effectively inactivate Escherichia coli in water. The effectiveness of the as-designed material stems from the synergistic interactions between Ag nanoparticles (NPs) and photoactive metal–organic frameworks (MOFs). In this complex material, the MOFs play a critical role in dispersing and isolating the Ag NPs, thus preventing undesirable aggregation during bacterial inactivation. Simultaneously, Ag NPs enhance the photocatalytic performance of the MOFs. Sterilization experiments demonstrate the remarkable rapid E. coli inactivation performance of Ag/NH₂-MIL-125(Ti) under illuminated and nonilluminated conditions. Within 25 min of visible light exposure, the as-prepared material achieves a >7-log E. coli reduction. In addition, Ag/NH₂-MIL-125(Ti) efficiently decomposes acetic acid, which is the main DBP precursor, under visible light irradiation. Mechanistic investigations revealed that ^•O₂^– and h⁺ were the primary active substances responsible for the inactivation of E. coli and the decomposition of acetic acid, respectively.

中文翻译：

Ag 纳米粒子和 Ti-MOF 协同作用有效灭活水中的大肠杆菌

由于传统氯基杀菌水处理的局限性，例如消毒副产物（DBP）的形成和对氯的抵抗力，需要新的方法和材料来有效消毒水。本研究重点开发一种新型灭菌材料Ag/NH ₂ -MIL-125(Ti)，旨在有效灭活水中的大肠杆菌。所设计材料的有效性源于银纳米颗粒（NP）和光敏金属有机框架（MOF）之间的协同相互作用。在这种复杂材料中，MOF 在分散和隔离银纳米粒子方面发挥着关键作用，从而防止细菌灭活过程中出现不需要的聚集。同时，Ag NPs 增强了 MOFs 的光催化性能。灭菌实验表明Ag/NH ₂ -MIL-125(Ti)在光照和非光照条件下具有显着的快速大肠杆菌灭活性能。在可见光照射 25 分钟内，所制备的材料实现了 >7-log 的大肠杆菌减少。此外，Ag/NH ₂ -MIL-125(Ti)在可见光照射下可有效分解作为主要DBP前体的乙酸。机理研究表明：^• O ₂^-和h ^{+分别是导致}大肠杆菌失活和乙酸分解的主要活性物质。

更新日期：2023-09-10

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