西安工程大学学报2025，Vol.39Issue(5)：17-28,12.DOI:10.13338/j.issn.1674-649x.2025.05.003
钨酸铋改性N-TiO2纳米管光电催化降解环丙沙星
Photoelectrocatalytic degradation of ciprofloxacin by Bi2WO6-modified N-TiO2 nanotubes
摘要
Abstract
The widespread use of antibiotics in healthcare,agriculture,and animal husbandry has led to their residues infiltrating the natural environment through wastewater,soil,and the food chain.The hazards of emerging contaminants like antibiotics to environmental and human health have become a global concern.To address this issue,this study synthesized a Bi2WO6/N-TiO2 nanotube heterojunction composite via plasma and hydrothermal methods for the photoelectrocat-alytic degradation of ciprofloxacin(CIP).Structural analyses(SEM,XPS,PL)reveal that the Bi2WO6/N/TiO2 electrode exhibits nanotubular morphology,with Bi and W existing as Bi3+and W6+,respectively.The modification of N-TiO2 nanotubes with Bi2WO6 effectively promotes the separation of electron-hole pairs.Electrochemical characterization reveals that the constructed heterojunction effectively reduces interfacial charge-transfer resistance,promotes the separation and transport of photogenerated charge carriers,and consequently enhances photoelectrocatalytic performance.Single-factor and response surface experiments identify optimal degradation condi-tions:Bi2WO6 loading concentration of 0.8 mmol,loading time of 20 h,applied bias voltage of 15 V,CIP concentration of 10 mg/L,and pH 7.Under these conditions,the CIP degradation effi-ciency reaches 71.96％,with a kinetic constant of 6.83×10-3 min-1.Scavenger experiments indi-cate that superoxide radicals(·O2-)and holes(h+)are the dominant active species.LC-MS a-nalysis suggests possible degradation pathways,including piperazine ring cleavage,dealkylation,cyclopropane group removal,decarboxylation-defluorination,C-N bond cleavage,and oxidative ring-opening,ultimately yielding inorganic byproducts such as CO2,H2O,F-,and NH4+.关键词
Bi2WO6/N-TiO2纳米管/环丙沙星/光电催化/降解Key words
Bi2WO6/N-TiO2 nanotubes/ciprofloxacin/photoelectrocatalysis/degradation分类
化学化工引用本文复制引用
王理明,王泽敏,李庆,张甜,郑维维,李幸龙..钨酸铋改性N-TiO2纳米管光电催化降解环丙沙星[J].西安工程大学学报,2025,39(5):17-28,12.基金项目
国家自然科学基金面上项目(22078253) （22078253）
陕西省科技厅重点研发计划项目(2023-YBSF-475) （2023-YBSF-475）
