Shen Huiying, Liao Shiqin, Jiang Chenyu, Zhang Jiawen, Wei Qufu, Ghiladi Reza A, Wang Qingqing
Key Laboratory of Eco-textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China.
Jiangxi Center for Modern Apparel Engineering and Technology, Jiangxi Institute of Fashion Technology, Nanchang 330201, China.
Carbohydr Polym. 2022 Feb 1;277:118853. doi: 10.1016/j.carbpol.2021.118853. Epub 2021 Nov 3.
For the purpose of developing multifunctional water purification materials capable of degrading organic pollutants while simultaneously inactivating microorganisms from contaminated wastewater streams, we report here a facile and eco-friendly method to immobilize molybdenum disulfide into bacterial cellulose via a one-step in-situ biosynthetic method. The resultant nanocomposite, termed BC/MoS, was shown to possess a photocatalytic activity capable of generating •OH from HO, while also exhibiting photodynamic/photothermal mechanisms, the combination of which exhibits synergistic activity for the degradation of pollutants as well as for bacterial inactivation. In the presence of HO, the BC/MoS nanocomposite exhibited excellent antibacterial efficacy upwards of 99.9999% (6 log units) for the photoinactivation of both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus upon infrared (IR) lamp illumination (100 W, 760 nm ≤ λ ≤ 5000 nm, 15 cm vertical distance; 5 min). Mechanistic studies revealed synergistic pathogen inactivation resulting from the combination of photocatalytically generated •OH and hyperthermia induced by the photothermal conversion of the near-IR light. In addition, the BC/MoS nanocomposite also showed excellent photodegradation activity for common aqueous contaminants in the presence of HO, including malachite green (a textile dye), catechol violet (a phenol) and formaldehyde. Taken together, our findings demonstrate that sustainable materials such as BC/MoS have potential applications in wastewater treatment and microorganism disinfection.
为了开发能够降解有机污染物并同时使受污染废水流中的微生物失活的多功能水净化材料，我们在此报告一种简便且环保的方法，通过一步原位生物合成法将二硫化钼固定到细菌纤维素中。所得的纳米复合材料，称为BC/MoS，被证明具有光催化活性，能够从HO产生•OH，同时还表现出光动力/光热机制，其组合对污染物的降解以及细菌失活表现出协同活性。在HO存在的情况下，BC/MoS纳米复合材料在红外（IR）灯照射（100 W，760 nm≤λ≤5000 nm，垂直距离15 cm；5分钟）下，对革兰氏阴性大肠杆菌和革兰氏阳性金黄色葡萄球菌的光灭活表现出超过99.9999%（6个对数单位）的优异抗菌效果。机理研究表明，光催化产生的•OH与近红外光的光热转换诱导的热疗相结合，导致协同的病原体失活。此外，BC/MoS纳米复合材料在HO存在的情况下，对常见的水性污染物，包括孔雀石绿（一种纺织染料）、邻苯二酚紫（一种酚类）和甲醛，也表现出优异的光降解活性。综上所述，我们的研究结果表明，诸如BC/MoS之类的可持续材料在废水处理和微生物消毒方面具有潜在应用。
