摘要
采用简易化学沉淀法成功合成了不同钨掺杂比的磷酸银,并研究其对左氧氟沙星的降解效果.利用X-射线衍射、傅里叶红外光谱、扫描电子显微镜、X-射线能谱和紫外可见漫反射光谱对光催化材料的形态、结构和光学性质进行表征,结果显示W^(6+)进入了磷酸银晶格,占据了P^(5+)的位置,提升了材料的结晶度.钨掺杂磷酸银后,其粒径的减小、结晶度的增强及光吸收范围的增大,进一步促进了光生电子-空穴对的分离;光催化降解实验结果表明,在pH值为5时,钨含量为0.5%的W-Ag_(3)PO_(4)在光照90min后对左氧氟沙星的降解率可达到89%;通过进一步分析降解机理,发现h+是光催化过程中主要的氧化物种,而·OH和·O_(2)^(-)只是发挥从属作用.在可见光照射下,与单纯的Ag_(3)PO_(4)相比,改性后W-Ag_(3)PO_(4)对左氧氟沙星展现出了更优越的催化效果.本研究制备的改性银基光催化剂增强了磷酸银的抗光腐蚀性,提高了其稳定性,为高效降解左氧氟沙星提供了新途径.
Silver phosphates with different tungsten doping ratios were successfully synthesized by a facile chemical precipitation method,and their degradation effects on levofloxacin were investigated.The morphology,structure and optical properties of the photocatalytic materials were characterized by X-ray diffraction,Fourier infrared spectroscopy,scanning electron microscopy,X-ray energy spectroscopy and UV-vis diffuse reflectance spectroscopy.W^(6+)enters the silver phosphate lattice,occupies the position of P5+and enhances the crystallinity of the material.The particle size of tungsten-doped silver phosphate was reduced,the crystallinity was enhanced,and the light absorption range was increased,which further promoted the separation of photogenerated electron-hole pairs.The results of photocatalytic degradation experiments showed that W-Ag_(3)PO_(4)with 0.5%tungsten content degraded levofloxacin by up to 89%after 90min of light exposure at pH 5.Further analysis of the degradation mechanism revealed that h+was the major oxide in the photocatalytic process,while·OH and·O_(2)^(-)played only a subordinate role.Under visible light irradiation,the modified W-Ag_(3)PO_(4)exhibited higher catalytic effect on levofloxacin compared with Ag_(3)PO_(4)alone.The modified silver-based photocatalyst prepared in this study enhanced the photocorrosion resistance of silver phosphate and improved its stability,providing a new route for the efficient degradation of levofloxacin.
作者
庞族族
丁宁
刘宏
PANG Zu-zu;DING Ning;LIU Hong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou,Suzhou 215009,China;School of Ecology Environment,Beijing Business University,Beijing 100048,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第9期4606-4615,共10页
China Environmental Science
基金
国家自然科学基金青年基金(51708381)
江苏省自然科学基金项目面上项目(BK20181466)
江苏省苏州市科技局民生科技项目(SS2019028)
苏州市生态环保局环保项目(B201903)。
关键词
半导体材料
可见光
光催化
抗生素
左氧氟沙星降解
semiconductor
visible light
photocatalysis
antibiotic
levofloxacin degradation
作者简介
庞族族(1995-),男,安徽宿州人,苏州科技大学硕士研究生,主要从事废水处理与资源化利用方面的研究.发表论文1篇.18896712601@139.com;刘宏,副教授,hong.liu@usts.edu.cn。
