title: Kinetic studies of nitrate removal from aqueous solution using granular chitosan-Fe(III) complex.
abstract: In the present study, a granular chitosan-Fe(III) complex was prepared as a feasible adsorbent for the removal of nitrate from an aqueous solution. There was no significant change in terms of nitrate removal efficiency over a wide pH range of 3-11. Nitrate adsorption on the chitosan-Fe(III) complex followed the Langmuir-Freundlich isotherm model. In order to more accurately reflect adsorption and desorption behaviors at the solid/solution interface, kinetic model I and kinetic model II were proposed to simulate the interfacial process in a batch system. Nitrate adsorption on the chitosan-Fe(III) complex followed the pseudo-first-order kinetic model and kinetic model I. The proposed half-time could provide useful information for optimizing process design. Adsorption and desorption rate constants obtained from kinetic model I and kinetic model II were beneficial to understanding the interfacial process and the extent of adsorption reaction. Kinetic model I and kinetic model II implied that nitrate uptake exponentially approaches a limiting value.
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China and Key Laboratory of Groundwater Cycle and Environment Evolution (China University of Geosciences (Beijing)), Ministry of Education, Beijing 100083, China E-mail: chennan@cugb.edu.cn.
authors.forename: Qili
authors.initials: Q
authors.lastname: Hu
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China and Key Laboratory of Groundwater Cycle and Environment Evolution (China University of Geosciences (Beijing)), Ministry of Education, Beijing 100083, China E-mail: chennan@cugb.edu.cn.
authors.forename: Nan
authors.initials: N
authors.lastname: Chen
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China and Key Laboratory of Groundwater Cycle and Environment Evolution (China University of Geosciences (Beijing)), Ministry of Education, Beijing 100083, China E-mail: chennan@cugb.edu.cn.
authors.forename: Chuanping
authors.initials: C
authors.lastname: Feng
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China and Key Laboratory of Groundwater Cycle and Environment Evolution (China University of Geosciences (Beijing)), Ministry of Education, Beijing 100083, China E-mail: chennan@cugb.edu.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: The Journal Center, China University of Geosciences (Beijing), Beijing 100083, China.
authors.forename: Weiwu
authors.initials: W
authors.lastname: Hu
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China and Key Laboratory of Groundwater Cycle and Environment Evolution (China University of Geosciences (Beijing)), Ministry of Education, Beijing 100083, China E-mail: chennan@cugb.edu.cn.
authors.forename: Long
authors.initials: L
authors.lastname: Lv
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D009566:Nitrates / Q000737:chemistry*; D009589:Nitrogen Oxides; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D009566:Nitrates; D009589:Nitrogen Oxides; D014874:Water Pollutants, Chemical; D048271:Chitosan