Jeevitha G, Sivaselvam S, Keerthana S, Mangalaraj D, Ponpandian N
Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641046, India.
Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641046, India.
Chemosphere. 2022 Jun;297:134023. doi: 10.1016/j.chemosphere.2022.134023. Epub 2022 Feb 25.
The present study discusses the ammonia (NH) sensing characteristics, photocatalytic degradation of emerging pollutants, and peroxidase mimic activity of multifunctional multi-walled carbon nanotube-tungsten oxide nanocomposite (MWCNT/WO) prepared by conventional solvothermal method. The prepared MWCNT/WO nanocomposites were characterized by various analytical techniques like XRD, Raman, XPS, N adsorption, FESEM with elemental analysis and diffuse reflection spectroscopy. The prepared 1% MWCNT/WO nanocomposite showed better gas sensing performance for the NH vapors at 10-100 ppm than the pristine WO and the response and recover time of about 13 and 15s towards 20 ppm of ammonia (NH) was achieved. The photocatalytic activity of MWCNT/WO towards organic dyes such as Rhodamine-B (Rh.B) methylene blue (MB) and pharmaceutical compound ciprofloxacin (CIP) were studied and achieved above 90% degradation at 160 min for CIP and 60 min for MB and Rho-B respectively. The radicle scavenging activity for MWCNT/WO nanocomposite showed the predominant formation of hydroxyl (OH) and superoxide radicle (O). Further, the MWCNT/WO nanocomposite showed peroxidase mimic activity and exhibit the limit of detection (LOD) of about 321 nM. From the overall analysis, MWCNT/WO hybrid seems to have potential characteristics that can be explored for multiple functional applications.
本研究探讨了通过传统溶剂热法制备的多功能多壁碳纳米管-氧化钨纳米复合材料（MWCNT/WO）的氨（NH₃）传感特性、新兴污染物的光催化降解以及过氧化物酶模拟活性。通过X射线衍射（XRD）、拉曼光谱、X射线光电子能谱（XPS）、氮吸附、带有元素分析的场发射扫描电子显微镜（FESEM）和漫反射光谱等各种分析技术对制备的MWCNT/WO纳米复合材料进行了表征。制备的1% MWCNT/WO纳米复合材料在10 - 100 ppm的NH₃蒸气中表现出比原始WO更好的气敏性能，并且对20 ppm的氨（NH₃）的响应和恢复时间分别约为13秒和15秒。研究了MWCNT/WO对罗丹明B（Rh.B）、亚甲基蓝（MB）等有机染料以及药物化合物环丙沙星（CIP）的光催化活性，分别在160分钟内对CIP和60分钟内对MB及Rh.B实现了90%以上的降解。MWCNT/WO纳米复合材料的自由基清除活性表明主要形成了羟基（OH）和超氧自由基（O₂⁻）。此外，MWCNT/WO纳米复合材料表现出过氧化物酶模拟活性，检测限（LOD）约为321 nM。从整体分析来看，MWCNT/WO杂化物似乎具有可用于多种功能应用的潜在特性。
