摘要
通过水热反应制备了新型SnNb2O6纳米片吸附剂,并利用X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积及孔径分析等手段对其结构和形貌进行了表征.以第三代喹诺酮类抗生素达氟沙星为吸附质,进行了影响因素实验、吸附动力学实验及等温吸附实验,探究了SnNb2O6对达氟沙星的吸附性能和吸附机理.实验结果表明,SnNb2O6吸附剂具有片状形貌,层状单斜相晶体结构,比表面积为52.89m^2/g.吸附剂用量、吸附温度、溶液pH值及吸附时间均对吸附率有一定影响.相应的等温吸附曲线可以较好地拟合Freundlich方程,且动力学实验数据可以用拟二级动力学方程描述,其中液膜扩散为主要控制步骤.在35℃下,吸附剂用量为0.09g,控制溶液pH值为6.02时,吸附30min即可达到较好效果,此时达氟沙星的吸附去除率为93.1%.
A novel SnNb2O6 nano-adsorbent was prepared via hydrothermal method. The structure and morphology of the sample were characterized by X-ray powder diffraction(XRD), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller(BET) techniques. Danofloxacin, as one of the third generation of quinolone antibiotics, was used as the adsorption target. The influencing factors experiment, adsorption kinetics experiment and isothermal adsorption experiment were designed to investigate the adsorption performance and adsorption mechanism of SnNb2O6 adsorbent. The results showed that the SnNb2O6 adsorbent has a layered monoclinic phase crystal structure with a specific surface area of 52.89 m^2/g. In addition, the amount of adsorbent, adsorption temperature, pH value and adsorption time all have an effect on the adsorption efficiency. The adsorption process conforms to the Freundlich equation at 35 ℃ and the adsorption kinetics meets the Pseudo-second-order kinetic equation, suggesting liquid film diffusion is dominant factor in adsorption process. At optimal conditions of 35 ℃ and pH=6.02 with the dosage of 0.09 g, the adsorption efficiency is up to 93.1% in 30 min.
作者
赵洁
宋强
郭笑
吴飞
田昊川
卢朝薇
ZHAO Jie;SONG Qiang;GUO Xiao;WU Fei;TIAN Haochuan;LU Zhaowei(School of Science,Xi’an University of Technology,Xi’an 710048,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第6期1121-1127,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21706207)资助~~
