原位合成高效抗菌活性凹凸棒石负载氯化银纳米粒子复合材料

In-situ Synthesis of Silver Chloride Nanoparticle-Loaded Attapulgite Composites with Efficient Antimicrobial Activity

摘要:

为提高AgCl纳米粒子（NPs）的分散性和光稳定性，将AgCl NPs锚定在凹凸棒石（ATP）表面制备了ATP-AgCl复合材料，研究了其微观形貌、晶体结构及抗菌性能。结果表明：ATP的引入有效避免了AgCl NPs的团聚，AgCl NPs的粒径从5~10 μm显著减小到3~20 nm。由于纳米粒子的小尺寸效应，ATP-AgCl复合材料表现出与纯AgCl相媲美的抗菌活性，其对大肠杆菌和金黄色葡萄球菌的抗菌率分别达到99.98%和99.88%。此外，ATP的引入还显著改善了AgCl NPs的光稳定性，复合材料经24 h阳光暴晒后仍保持原始的灰白色。

Abstract:

To enhance the dispersibility and photostability of AgCl nanoparticles (NPs), AgCl NPs were firmly anchored on the surface of attapulgite (ATP) to prepare the ATP-AgCl composites. The microstructure, crystal structure, and antibacterial activity of the ATP-AgCl composites were investigated. Results demonstrate that the introducion of ATP not only avoids the agglomeration of AgCl NPs, but also decreases their particle size from 5–10 μm to 3–20 nm. Due to the small size effect of NPs, the antibacterial activity of as-prepared ATP-AgCl composites is comparable to that of pure AgCl. The antibacterial ratios against Escherichia coli and Staphylococcus aureus are 99.98% and 99.88%, respectively. Additionally, the introduction of ATP also improves the photostability of AgCl NPs: the composites remains offwhite after exposure to sunshine for 24 h.