title: Adsorption of nitrate from aqueous solution by magnetic amine-crosslinked biopolymer based corn stalk and its chemical regeneration property.
abstract: A novel adsorbent of magnetic amine-crosslinked biopolymer based corn stalk (MAB-CS) was synthesized and used for nitrate removal from aqueous solution. The characters and adsorption mechanisms of this bio-adsorbent were determined by using VSM, TGA, XRD, SEM, TEM, FT-IR and XPS, respectively. The results revealed that the saturated magnetization of MAB-CS reached 6.25 emu/g. Meanwhile, the studies of various factors indicated that this novel magnetic bio-adsorbent performed well over a considerable wide pH range of 6.0 ∼ 9.0, and the presence of PO4(3-) and SO4(2-) would markedly decrease the nitrate removal efficiency. Furthermore, the nitrate adsorption by MAB-CS perfectly fitted the Langmuir isotherm model (R(2)=0.997-0.999) and pseudo second order kinetic model (R(2)=0.953-0.995). The calculated nitrate adsorption capacity of MAB-CS was 102.04 mg/g at 318 K by Langmuir model, and thermodynamic study showed that nitrate adsorption is an spontaneous endothermic process. The regeneration experiments indicated its merit of regeneration and stability with the recovery efficient of 118 ∼ 147%. By integrating the experimental results, it was found that the removal of nitrate was mainly via electrostatic attraction and ion exchange. And this novel bio-adsorbent prepared in this work could achieve effective removal of nitrate 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: 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: Fang
authors.initials: F
authors.lastname: Wang
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: Nan
authors.initials: N
authors.lastname: Xue
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: Shenglei
authors.initials: S
authors.lastname: Sun
authors.affiliation: Jinan Water and Wastewater Monitoring Center, 250033 Jinan, PR China.
authors.forename: Wuchang
authors.initials: W
authors.lastname: Song
authors.affiliation: Jinan Water and Wastewater Monitoring Center, 250033 Jinan, PR China.
authors.forename: Ruibao
authors.initials: R
authors.lastname: Jia
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry; D001704:Biopolymers / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D060328:Magnetic Phenomena; D009566:Nitrates / Q000737:chemistry*; D059027:Recycling; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D003313:Zea mays
chemical_list: D000588:Amines; D001704:Biopolymers; D003432:Cross-Linking Reagents; D009566:Nitrates; D012996:Solutions; D014874:Water Pollutants, Chemical
keywords: Adsorption; Biopolymer; Chemical regeneration; Magnetic; Nitrate