摘要
文章以壳聚糖(CTS)、纳米四氧化三铁为原材料,利用滴加成球法制备了CTS@纳米Fe_(3)O_(4)复合微球,通过X射线衍射、傅里叶红外光谱、扫描电镜对复合微球的形貌及结构进行了表征。同时研究了CTS@纳米Fe_(3)O_(4)复合微球在不同质量比、pH以及温度条件下对水中As(Ⅲ)吸附效果的影响,并进行了等温吸附及动力学方程的拟合。结果表明,吸附量与微球中纳米Fe_(3)O_(4)质量比呈正相关,在CTS/纳米Fe_(3)O_(4)质量比=1∶2时,吸附量最佳可达到18.9025 mg/g。整个吸附过程更符合Freundlich等温吸附模型和准二级动力学模型,表明CTS@纳米Fe_(3)O_(4)复合微球是不均匀表面的多分子层吸附,主要受到化学吸附的主导。
Chitosan(CTS)and nanometer ferric tetroxide were used as raw materials to prepare CTS@nano-Fe_(3)O_(4)composite microspheres by the droplet preparation method,and the shape of composite microspheres was prepared by X-ray diffraction,infrared and scanning electron microscopy.The appearance and structure were characterized.The effects of CTS@nano-Fe_(3)O_(4)composite microspheres on the adsorption of As(Ⅲ)in water at different mass ratios,pH and temperature were studied.The isothermal adsorption and kinetic equations were fitted.The results showed that the adsorption amount was positively correlated with the mass ratio of nano-Fe_(3)O_(4)in the microspheres.When the mass ratio of CTS@nano-Fe_(3)O_(4)is 1∶2,the adsorption amount can reach 18.9025 mg/g.The whole adsorption process accords with the Freundlich isotherm adsorption model,and the kinetic process follows the quasi-secondary kinetic model,indicating that the CTS@nano-Fe_(3)O_(4)composite microspheres are multi-molecular layer adsorption of uneven surface,which is mainly dominated by chemical adsorption.
作者
邓天天
李晗晟
刘千源
王志恩
耿天治
DENG Tiantian;LI Hansheng;LIU Qianyuan;WANG Zhi'en;GENG Tianzhi(School of Environment and Biological Engineering,Henan University of Engineering,Zhengzhou 451191,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第6期84-90,共7页
Environmental Science & Technology
基金
2019河南省科技计划项目(192102310505)。
关键词
壳聚糖
纳米四氧化三铁
吸附
三价砷
chitosan
nanometer ferric tetroxide
adsorption
As(Ⅲ)
