title: Uptake of perchlorate from aqueous solutions by amine-crosslinked cotton stalk.
abstract: Virgin cotton stalk was produced into an effective biosorbent for perchlorate adsorption. Surface analysis including BET surface area and SEM illustrated the reduction of porous structure in amine-crosslinked cotton stalk (AC-CS). Elemental and zeta potential analysis validated the graft of some positively charged amine groups on surface of AC-CS. Spectra analysis (XPS, FTIR and Raman spectra) suggested that interaction between AC-CS and ClO4(-) should be based on electrostatic attraction. The maximum adsorption capacity (qmax) of AC-CS for perchlorate at different pHs (3.0, 6.0, 9.0 and 11.0) were calculated as 29.6, 42.6, 41.0 and 33.0 mg/g, respectively. The saturated perchlorate uptakes in column were in range of 25.0-38.1 mg/g at different pHs. In addition, the exhausted AC-CS column was regenerated by 0.5 mol/L of NaCl solution, which was adequate for almost complete desorption of the perchlorate.
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.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Xin
authors.initials: X
authors.lastname: Tan
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Zhang
authors.forename: DongTing
authors.initials: D
authors.lastname: Yue
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D001692:Biological Transport; D003368:Gossypium / Q000737:chemistry*; D010472:Perchlorates / Q000378:metabolism*; D018547:Plant Stems / Q000737:chemistry* / Q000378:metabolism*; D012996:Solutions; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D000588:Amines; D010472:Perchlorates; D012996:Solutions; D014867:Water; C494474:perchlorate
keywords: Column adsorption; Cotton stalk; Isotherm; Perchlorate; XPS