碳纳米管/钒酸铋光催化降解盐酸四环素  

Degradation of tetracycline hydrochloride by CNTs/BiVO_4 photocatalytic

作　　者：李欣[1] 王铁成[1,2] 屈广周[1,2] 梁东丽[1,2] 呼世斌[1,2] 

机构地区：[1]西北农林科技大学资源与环境学院,杨凌712100 [2]农业部西北植物营养与农业环境重点实验室,杨凌712100

出　　处：《环境工程学报》2017年第5期2738-2742,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21107085);中央高校基本科研业务费专项资金资助项目(QN2013073);陕西省自然科学基金资助项目(2015JQ2051);江西省持久性污染物控制与资源循环利用重点实验室开放基金(ES201780295)

摘　　要：采用静电纺丝技术制备了碳纳米管/钒酸铋(CNTs/BiVO_4)光催化剂,利用SEM、XRD和UV-vis漫反射光谱对催化剂进行了表征。通过对盐酸四环素的降解,研究了CNTs/BiVO_4在模拟可见光下的光催化降解性能,考察了pH对光降解率的影响,分析了不同活性基团在光催化过程中的作用。结果表明,制备出的CNTs/BiVO_4具有较高可见光响应,且CNTs与BiVO_4结合紧密,形成了单斜晶型支架结构。与BiVO_4相比,CNTs/BiVO_4光降解盐酸四环素的活性显著增强,催化性能提高的原因可能是由于催化剂中光生电子-空穴的高效分离造成的;同时发现随着溶液pH的增大,盐酸四环素的降解率减小。添加捕获剂的实验结果表明:空穴在CNTs/BiVO_4光催化降解盐酸四环素的过程中起主导作用;但随着辐照时间的延长,·OH的作用越来越明显。A carbon nanotube（CNT）/BiVO_4 photocatalyst was prepared by electrospinning.The catalyst was characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）,and UV-vis diffuse reflectance spectroscopy.The photocatalytic performance of CNT/BiVO_4 was evaluated by the degradation of tetracycline hydrochloride under simulated visible light.The effects of pH on the degradation efficiency and the role of different active groups in the photocatalysis were analyzed.The results indicate that CNT/BiVO_4 has a higher response to visible light and the CNTs form a network structure on BiVO_4,forming a monoclinic support structure.Compared with BiVO_4,the photocatalytic activity of CNT/BiVO_4 is significantly enhanced,which may be due to the efficient separation of electron-hole pairs.With increasing pH,the degradation of tetracycline hydrochloride slows.Photocatalytic experiments using capture agents show that the holes play an important role in the photocatalytic degradation of tetracycline hydrochloride by CNT/BiVO_4,while the role of ·OH becomes increasingly strong over longer irradiation times.

关 键 词：静电纺丝 碳纳米管/钒酸铋 盐酸四环素 光催化 降解 

分 类 号：X703.1[环境科学与工程—环境工程]