title: Synthesis of tin oxide nanospheres under ambient conditions and their strong adsorption of As(III) from water.
abstract: The development of highly efficient As(iii) adsorbents is critical to largely simplify the arsenic treatment process and lower its cost. For the first time, SnO2 nanospheres were demonstrated to possess a highly efficient As(iii) adsorption capability from water in a near neutral pH environment as predicted by the material criterion we recently developed for the selection of highly efficient arsenic adsorbents. These SnO2 nanospheres were synthesized by a simple and cost-effective hydrolysis process with the assistance of ethyl acetate under ambient conditions, which had a good dispersity, a narrow size distribution, a relatively large specific surface area, and a porous structure. A fast As(iii) adsorption was observed in the kinetics study on these SnO2 nanospheres, and their Langmuir adsorption capacity was determined to be ∼112.7 mg g(-1) at pH ∼7. The As(iii) adsorption mechanism on SnO2 nanospheres was examined by both macroscopic and microscopic techniques, which demonstrated that it followed the inner-sphere complex model. These SnO2 nanospheres demonstrated effective As(iii) adsorption even with exceptionally high concentrations of co-existing ions, and a good regeneration capability by washing with NaOH solution.
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, P. R. China. qili@imr.ac.cn.
authors.forename: Ge
authors.initials: G
authors.lastname: Zhang
authors.forename: Wuzhu
authors.initials: W
authors.lastname: Sun
authors.forename: Lingmei
authors.initials: L
authors.lastname: Liu
authors.forename: Weiyi
authors.initials: W
authors.lastname: Yang
authors.forename: Zhengchao
authors.initials: Z
authors.lastname: Xu
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.forename: Jian Ku
authors.initials: JK
authors.lastname: Shang
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D054118:Nanospheres / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry*; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000191:economics / Q000379:methods*
chemical_list: D017971:Tin Compounds; D014874:Water Pollutants, Chemical; D014867:Water; C045358:stannic oxide; D001151:Arsenic