Do Tho Chau Minh Vinh, Nguyen Duy Quoc, Nguyen Kien Trung, Le Phuoc Huu
Department of Drug Quality Control - Analytical Chemistry - Toxicology, Faculty of Pharmacy, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 94000, Vietnam.
Department of Physiology, Faculty of Medicine, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 94000, Vietnam.
Materials (Basel). 2019 Jul 31;12(15):2434. doi: 10.3390/ma12152434.
Antibiotic residues in aquaculture wastewater are considered as an emerging environmental problem, as they are not efficiently removed in wastewater treatment plants. To address this issue, we fabricated TiO nanotube arrays (TNAs), TiO nanowires on nanotube arrays (TNWs/TNAs), Au nanoparticle (NP)-decorated-TNAs, and TNWs/TNAs, which were applied for assessing the photocatalytic degradation of eight antibiotics, simultaneously. The TNAs and TNWs/TNAs were synthesized by anodization using an aqueous NHF/ethylene glycol solution. Au NPs were synthesized by chemical reduction method, and used to decorate on TNAs and TNWs/TNAs. All the TiO nanostructures exhibited anatase phase and well-defined morphology. The photocatalytic performance of TNAs, TNWs/TNAs, Au-TNAs and Au-TNWs/TNAs was studied by monitoring the degradation of amoxicillin, ampicillin, doxycycline, oxytetracycline, lincomycin, vancomycin, sulfamethazine, and sulfamethoxazole under ultraviolet (UV)-visible (VIS), or VIS illumination by LC-MS/MS method. All the four kinds of nanomaterials degraded the antibiotics effectively and rapidly, in which most antibiotics were removed completely after 20 min treatment. The Au-TNWs/TNAs exhibited the highest photocatalytic activity in degradation of the eight antibiotics. For example, reaction rate constants of Au-TNWs/TNAs for degradation of lincomycin reached 0.26 min and 0.096 min under UV-VIS and VIS irradiation, respectively; and they were even higher for the other antibiotics. The excellent photocatalytic activity of Au-TNWs/TNAs was attributed to the synergistic effects of: (1) The larger surface area of TNWs/TNAs as compared to TNAs, and (2) surface plasmonic effect in Au NPs to enhance the visible light harvesting.
水产养殖废水中的抗生素残留被视为一个新出现的环境问题，因为它们在污水处理厂中无法被有效去除。为解决这一问题，我们制备了二氧化钛纳米管阵列（TNAs）、纳米管阵列上的二氧化钛纳米线（TNWs/TNAs）、金纳米颗粒（NP）修饰的TNAs以及TNWs/TNAs，用于同时评估八种抗生素的光催化降解情况。TNAs和TNWs/TNAs通过使用NHF/乙二醇水溶液进行阳极氧化合成。金纳米颗粒通过化学还原法合成，并用于修饰TNAs和TNWs/TNAs。所有的二氧化钛纳米结构均呈现锐钛矿相且形态明确。通过采用液相色谱-串联质谱法（LC-MS/MS）监测阿莫西林、氨苄西林、强力霉素、土霉素、林可霉素、万古霉素、磺胺二甲嘧啶和磺胺甲恶唑在紫外（UV）-可见（VIS）光或可见光照射下的降解情况，研究了TNAs、TNWs/TNAs、金-TNAs和金-TNWs/TNAs的光催化性能。所有这四种纳米材料均能有效且快速地降解抗生素，其中大多数抗生素在处理20分钟后被完全去除。金-TNWs/TNAs在八种抗生素的降解中表现出最高的光催化活性。例如，金-TNWs/TNAs在紫外-可见光和可见光照射下，林可霉素降解的反应速率常数分别达到0.26 min⁻¹和0.096 min⁻¹；对其他抗生素的反应速率常数甚至更高。金-TNWs/TNAs优异的光催化活性归因于以下协同效应：（1）与TNAs相比，TNWs/TNAs具有更大的表面积；（2）金纳米颗粒中的表面等离子体效应增强了可见光的捕获。
