摘要
Buckypapers(BPs)consist of carbon nanotube(CNT)membranes with good mechanical,thermal and elec-trical properties.We report the modification of CNT buckypapers by the surface deposition of a thin layer of ti-tanium dioxide and their subsequent photocatalytic use for the removal of three wastewater pollutants:diclofenac(DF),carbofuran(CB)and methylene blue(MB).The results show the following decreases(RE)in the initial concentrations of these pollutants,REDF=99.5%,REMB=96%and RECB=90%after 90 min of exposure to UV-Vis radiation using~0.6 mg of photocatalyst.Experiments also showed that the degradation rate of diclofenac(k=0.1028 min^(−1))is respectively 3.5 and 6 times faster than the values for CB(k=0.0298 min^(−1))and MB(k=0.0174 min^(−1)),probably due to the easier bond cleavage in DF.UV-Vis irradiated solutions of these pollutants were then analyzed by mass spectrometry to identify the species formed during photocatalysis and suggest possible degradation paths for MB,DF,and CB.Data showed that the degradation of DF involves the formation of a photocyclization product through loss of HCl molecule,clearly consuming less energy than that needed for the opening of the central aromatic ring in MB,or the loss of the N-methyl amide functional group for CB.
巴克纸(BPs)由具有良好力学、热学和电学性能的碳纳米管(CNT)膜组成。本研究通过在巴克纸上表面沉积一层薄薄的TiO_(2)进行改性,并将其用于光催化去除双氯芬酸(DF)、卡巴呋喃(CB)和亚甲基蓝(MB)三种废水污染物。结果显示相比于初始浓度,在使用约0.6 mg光催化剂并暴露于紫外-可见光90 min后,这些污染物浓度分别降低了99.5%、96%和90%。DF的降解速率(k=0.1028 min^(-1))分别比CB(k=0.0298 min^(-1))和MB(k=0.0174 min^(-1))快3.5倍和6倍,这可能是因为DF中的化学键更容易断裂。随后,对经紫外-可见光照射后的污染物溶液进行质谱分析,以鉴定光催化过程中生成的物质,进一步推测了DF、CB和MB的分解路径。质谱分析表明,DF的降解涉及通过失去HCl分子形成一种光环化产物,这比MB中心芳香环的开环反应以及CB中N-甲基酰胺官能团的脱去所消耗的能量要少。
出处
《新型炭材料(中英文)》
北大核心
2025年第2期456-481,共26页
New Carbon Materials
基金
MIUR,Italian Ministry for University and Research(EX-60%/2024)。
作者简介
通讯作者:Giovanni De Filpo.E-mail:giovanni.defilpo@unical.it。
