title: High-capacity adsorption of dissolved hexavalent chromium using amine-functionalized magnetic corn stalk composites.
abstract: Easily separable amine-functionalized magnetic corn stalk composites (AF-MCS) were employed for effective adsorption and reduction of toxic hexavalent chromium [Cr(VI)] to nontoxic Cr(III). The saturated magnetization of AF-MCS reached 6.2emu/g, and as a result, it could be separated from aqueous solution by a magnetic process for its superparamagnetism. The studies of various factors influencing the sorption behavior indicated that the optimum AF-MCS dosage for Cr(VI) adsorption was 1g/L, and the maximum adsorption capacity was observed at pH 3.0. The chromium adsorption perfectly fitted the Langmuir isotherm model and pseudo second order kinetic model. Furthermore, characterization of AF-MCS was investigated by means of XRD, SEM, TEM, FT-IR, BET, VSM and XPS analysis to discuss the uptake mechanism. Basically, these results demonstrated that AF-MCS prepared in this work has shown its merit in effective removal of Cr(VI) and rapid separation from effluents simultaneously.
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Song
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China. Electronic address: bygao@sdu.edu.cn.
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Tengge
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Xing
authors.initials: X
authors.lastname: Xu
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Huang
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Huan
authors.initials: H
authors.lastname: Yu
authors.affiliation: Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification*; D003198:Computer Simulation; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D059346:Magnets; D008956:Models, Chemical; D010316:Particle Size; D035261:Plant Components, Aerial / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D014462:Ultrafiltration / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods; D003313:Zea mays / Q000737:chemistry*
chemical_list: D000588:Amines; D058185:Magnetite Nanoparticles; D012996:Solutions; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion
keywords: Adsorption; Bio-adsorbent; Corn stalk; Cr(VI); Magnetic material