title: Efficient removal of boron acid by N-methyl-D-glucamine functionalized silica-polyallylamine composites and its adsorption mechanism.
abstract: A novel boron adsorbent was fabricated by grafting a boric acid chelating group, i.e., N-methyl-D-glucamine, onto the hydrophilic silica-polyallylamine composites (SPC). The boron adsorbent was characterized by scanning electron microscopy (SEM) and TGA method. The adsorption experiment indicated a maximum boron load capacity of ca. 1.55 mmol g(-1). The high load capacity was attributed to specific chemical affinity and physical adsorption. Highly effective removal of boric acid from aqueous solution was observed for the adsorbent even in the synthetic seawater containing high concentration of foreign ions. Analysis of adsorption thermodynamic and kinetics revealed a spontaneous sorption process that is driven by enthalpy change and limited by chemical reaction. The exhausted adsorbent was regenerated for repeated use by treating with 3% HCl solution, followed by neutralizing with 3% NH(3)·H(2)O at ambient temperature. Only 7% capacity loss was observed after five continuous adsorption-regeneration cycles.
authors.affiliation: Engineering and Technology Research Center for Inorganic Type Ion-Exchange Resin, Henan University, Kaifeng, PR China. mzlixin@jyu.edu.cn
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Ru
authors.initials: R
authors.lastname: Liu
authors.forename: Shan
authors.initials: S
authors.lastname: Wu
authors.forename: Jiong
authors.initials: J
authors.lastname: Liu
authors.forename: Shushan
authors.initials: S
authors.lastname: Cai
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D001888:Boric Acids / Q000302:isolation & purification*; D001895:Boron / Q000302:isolation & purification; D008536:Meglumine / Q000031:analogs & derivatives*; D011073:Polyamines / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D001888:Boric Acids; D011073:Polyamines; D014874:Water Pollutants, Chemical; C063994:polyallylamine; D008536:Meglumine; D012822:Silicon Dioxide; D001895:Boron; C032688:boric acid