State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University , 210009 Nanjing, China.
ACS Appl Mater Interfaces. 2018 Jan 17;10(2):1792-1801. doi: 10.1021/acsami.7b18136. Epub 2018 Jan 5.
To tackle severe environmental pollution, a search for materials by economical and eco-friendly preparations is demanding for public health. In this study, a novel in situ method to form silver nanoparticles under mild conditions was developed using biomimetic reducing agents of polydopamine coated on the rodlike mesoporous silica of SBA-15. The synthesized SBA-15/polydopamine (PDA)/Ag nanocomposites were characterized by a combination of physicochemical and electrochemical methods. 4-Nitrophenol (4-NP) and methylene blue (MB) were used as models for the evaluation of the prepared nanocatalysts of SBA-15/PDA/Ag in which the composite exhibited enhanced catalytic performance toward degrading 4-NP in solution and MB on the membrane, respectively. Additionally, compared with that of solid core-shell SiO/PDA/Ag, tubular SBA-15/PDA/Ag showed the prolonged inhibitory effect on microbial growth as typified by Escherichia coli (60 h), Staphylococcus aureus (36 h), and Aspergillus fumigatus (60 h), which demonstrated efficient control of silver nanoparticles release from the mesopores. The constructed dual-functional SBA-15/PDA/Ag as the long-term antimicrobial agent and the catalyst of industrial products provides an integrated nanoplatform to deal with environmental concerns.
为了解决严重的环境污染问题，人们迫切需要寻找经济环保的材料来保障公众健康。在这项研究中，我们开发了一种在温和条件下利用多巴胺包覆的棒状介孔硅 SBA-15 仿生还原剂原位形成银纳米粒子的新方法。通过物理化学和电化学方法的结合对合成的 SBA-15/聚多巴胺（PDA）/Ag 纳米复合材料进行了表征。以 4-硝基苯酚（4-NP）和亚甲基蓝（MB）为模型，评估了 SBA-15/PDA/Ag 纳米催化剂的催化性能，结果表明，复合材料在溶液中降解 4-NP 和在膜上降解 MB 均表现出增强的催化性能。此外，与实心核壳 SiO/PDA/Ag 相比，管状 SBA-15/PDA/Ag 对大肠杆菌（60 h）、金黄色葡萄球菌（36 h）和烟曲霉（60 h）的生长表现出更长的抑制作用，这表明银纳米粒子从介孔中释放得到了有效控制。构建的具有双重功能的 SBA-15/PDA/Ag 作为长期抗菌剂和工业产品的催化剂提供了一个综合的纳米平台，以应对环境问题。
