A novel and stretchable carbon-nanotube/Ni@TiO_(2):W photocatalytic composite for the complete removal of diclofenac drug from the drinking water  

作　　者：Ernesto Valadez-Renteria Rafael Perez-Gonzalez Christian Gomez-Solis Luis Armando Diaz-Torres Armando Encinas Jorge Oliva Vicente Rodriguez-Gonzalez 

机构地区：[1]Consejo Nacional de Ciencia y Tecnología-División de Materiales Avanzados,Instituto Potosino de Investigación Científica y Tecnológica,San Luis Potosí78216,México [2]División de Ciencias e Ingenierías,Universidad de Guanajuato,León 37150,México [3]Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados(GEMANA),Centro de Investigaciones enóptica,A.C.,Lomas Del Campestre,León 37150,México

出　　处：《Journal of Environmental Sciences》2023年第4期575-589,共15页环境科学学报（英文版）

基　　金：CONACyT-México by the Project (No.101703)。

摘　　要：We present the structural,morphological and photocatalytic properties of stretchable composites made with carbon nanotubes (CNTs),silicon rubber and Ni@TiO_(2):W nanoparticles(TiWNi NPs) with average size of 37±2 nm.Microscopy images showed that the TiWNi NPs decorated the surface of the CNT fibers,which are oriented in a preferential direction.TiWNi NPs presented a mixture of anatase/rutile phases with cubic structure.The performance of the TiWNi powders and stretchable composites was evaluated for the photocatalytic degradation of diclofenac (DCF) anti-inflammatory drug under ultraviolet-visible light.The results revealed that the maximum DCF degradation percentages were 34.6%,91.9%,97.1%,98.5%and 100%for the CNT composite (stretched at 0%),TiWNi powders,CNT+TiWNi(stretched at 0%),CNT+TiWNi (stretched at 50%) and CNT+TiWNi (stretched at 100%),respectively.Thus,stretching the CNT+TiWNi composites was a good strategy to enhance the DCF degradation percentage from 97.1%to 100%,since stretching created additional defects (oxygen vacancies) that acted as electron sink,delaying the electron-hole recombination,and favors the DCF degradation.Raman/absorbance measurements confirmed the presence of such defects.Moreover,the reactive oxygen species (ROS) were determined by the scavenger’s experiments and found that the main ROS were the·OH and O_(2)-radicals,which attacked the DCF molecules,causing their degradation.The results of this investigation confirmed that the stretchable CNT/TiWNi-based composites are a viable alternative to remove pharmaceutical contaminants from water and can be manually separated from the decontaminated water,which is unviable using photocatalytic powders.

关 键 词：DICLOFENAC Pharmaceutical contaminant TiO_(2) Carbon nanotubes Stretchable composite Photocatalysis 

分 类 号：TU991.2[建筑科学—市政工程] O643.36[理学—物理化学] O644.1[理学—化学]