title: Influence of environmental factors on the phosphorus adsorption of lanthanum-modified bentonite in eutrophic water and sediment.
abstract: Lanthanum-modified bentonite has potential for wide application in eutrophication control. We investigated P adsorption on a lanthanum-modified bentonite by analysis of adsorption kinetics, equilibrium, and the effect of environmental factors. P adsorption closely followed the pseudo-second-order kinetic model, and the isotherm was well described by the Langmuir model. This adsorbent could effectively immobilize P into the sediment, but the adsorption process was strongly dependent on pH, anions, and low molecular weight organic acids (LMWOAs). P adsorption increased with increasing pH from 0.52 mg P/g at pH 3.0 to 0.93 mg P/g at pH 7.0 with no adsorption at pH 11. P adsorption was strongly inhibited in the presence of anions and three LMWOAs, with P even re-released at high concentrations. These environmental factors should be given significant attention when considering the application of lanthanum-modified bentonite in eutrophication control.
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, No. 92, Weijin Rd., Nankai District, Tianjin, 300072, People's Republic of China.
authors.forename: SheJiang
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, No. 92, Weijin Rd., Nankai District, Tianjin, 300072, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, No. 92, Weijin Rd., Nankai District, Tianjin, 300072, People's Republic of China. ykyang@tju.edu.cn.
authors.forename: YongKui
authors.initials: Y
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, No. 92, Weijin Rd., Nankai District, Tianjin, 300072, People's Republic of China.
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, No. 92, Weijin Rd., Nankai District, Tianjin, 300072, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Ding
mesh_terms: D000327:Adsorption; D000838:Anions / Q000737:chemistry; D001546:Bentonite / Q000737:chemistry*; D005068:Eutrophication; D006863:Hydrogen-Ion Concentration; D007811:Lanthanum / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification
chemical_list: D000838:Anions; D014874:Water Pollutants, Chemical; D014867:Water; D001546:Bentonite; D010758:Phosphorus; D007811:Lanthanum
keywords: Adsorption; Environmental; Fraction; Lanthanum-modified bentonite (LMB); Phosphorus (P); Sediment