title: Magnetic chitosan nanoparticles for removal of Cr(VI) from aqueous solution.
abstract: A simple method was introduced to prepare magnetic chitosan nanoparticles by co-precipitation via epichlorohydrin cross-linking reaction. The average size of magnetic chitosan nanoparticles is estimated at ca. 30 nm. It was found that the adsorption of Cr(VI) was highly pH-dependent and its kinetics follows the pseudo-second-order model. Maximum adsorption capacity (at pH 3, room temperature) was calculated as 55.80 mg·g(-1), according to Langmuir isotherm model. The nanoparticles were thoroughly characterized before and after Cr(VI) adsorption. From this result, it can be suggested that magnetic chitosan nanoparticles could serve as a promising adsorbent for Cr(VI) in wastewater treatment technology.
authors.affiliation: School of Chemical Engineering, Hanoi University of Science and Technology, 1, Dai Co Viet Road, Hanoi, Viet Nam.
authors.forename: Nguyen Ngoc
authors.initials: NN
authors.lastname: Thinh
authors.forename: Pham Thi Bich
authors.initials: PT
authors.lastname: Hanh
authors.forename: Le Thi Thanh
authors.initials: le TT
authors.lastname: Ha
authors.forename: Le Ngoc
authors.initials: le N
authors.lastname: Anh
authors.forename: Tran Vinh
authors.initials: TV
authors.lastname: Hoang
authors.forename: Vu Dinh
authors.initials: VD
authors.lastname: Hoang
authors.forename: Le Hai
authors.initials: le H
authors.lastname: Dang
authors.forename: Nguyen Van
authors.initials: NV
authors.lastname: Khoi
authors.forename: Tran Dai
authors.initials: TD
authors.lastname: Lam
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D060328:Magnetic Phenomena; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D012996:Solutions; D013696:Temperature; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014961:X-Ray Diffraction
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D048271:Chitosan
keywords: Adsorption isotherm; Cr(VI); Fe(3)O(4); Magnetic chitosan nanoparticles