title: A novel adsorbent of Na(2)Ta(2)O(6) porous microspheres with F(-) gradient concentration distribution: high cationic selectivity and well-regulated recycling.
abstract: Pyrochlore Na2Ta2O6 porous microspheres with F(-) gradient concentration distribution were first prepared, which showed an excellent selectivity toward cationic dyes as an adsorbent. These dyes were regenerated rapidly by adding to NaAc solution. After then, the adsorbent still showed a high adsorption capacity. Optionally, the effective recycling of the adsorbents was achieved by UV light illumination, free of secondary environmental contamination. The rate of adsorption reaction followed the pseudo second-order kinetics, and the sorption isotherm well fitted to the Freundlich isotherm model. Eventually, the adsorption reaction for the absorbents was found to be a spontaneous and endothermic process.
authors.affiliation: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China.
authors.forename: Shushu
authors.initials: S
authors.lastname: Huang
authors.affiliation: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China.
authors.forename: Yiguo
authors.initials: Y
authors.lastname: Su
authors.affiliation: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China.
authors.forename: Zhanli
authors.initials: Z
authors.lastname: Chai
authors.affiliation: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhai
authors.affiliation: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China. Electronic address: wang_xiao_jing@hotmail.com.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D005461:Fluorine / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D008863:Microspheres; D010087:Oxides / Q000737:chemistry*; D016062:Porosity; D059027:Recycling; D013635:Tantalum / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D010087:Oxides; D014874:Water Pollutants, Chemical; C404416:sodium tantalate; D005461:Fluorine; D013635:Tantalum; C100258:methyl orange; D008751:Methylene Blue
keywords: Adsorption; Cationic dyes; F(−) gradient concentration; Regeneration; Tantalate; Thermodynamic parameters