title: Acid-base properties and surface complexation modeling of phosphate anion adsorption by wasted low grade iron ore with high phosphorus.
abstract: The adsorption phenomena and specific reaction processes of phosphate onto wasted low grade iron ore with high phosphorus (WLGIOWHP) were studied in this work. Zeta potential and Fourier transform infrared spectroscopy (FTIR) analyses were used to elucidate the interaction mechanism between WLGIOWHP and aqueous solution. The results implied that the main adsorption mechanism was the replacement of surface hydroxyl groups by phosphate via the formation of inner-sphere complex. The adsorption process was characterized by chemical adsorption onto WLGIOWHP. The non-electrostatic model (NEM) was used to simulate the surface adsorption of phosphate onto WLGIOWHP. The total surface site density and protonation constants for NEM (N(T)=1.6×10(-4) mol/g, K(a1)=2.2×10(-4), K(a2)=6.82×10(-9)) were obtained by non-linear data fitting of acid-base titrations. In addition, the NEM was used to establish the surface adsorption complexation modeling of phosphate onto WLGIOWHP. The model successfully predicted the adsorption of phosphate onto WLGIOWHP from municipal wastewater.
authors.affiliation: College of Material Science and Engineering, Chongqing University, Chongqing 400044, China; School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Yuan
authors.affiliation: College of Material Science and Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Chenguang
authors.initials: C
authors.lastname: Bai
authors.affiliation: School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, China. Electronic address: wentangx@163.com.
authors.forename: Wentang
authors.initials: W
authors.lastname: Xia
authors.affiliation: School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
authors.forename: Juan
authors.initials: J
authors.lastname: An
mesh_terms: D000143:Acids / Q000737:chemistry; D000327:Adsorption; D058085:Iron Compounds / Q000737:chemistry*; D010710:Phosphates / Q000302:isolation & purification*; D010758:Phosphorus / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*
chemical_list: D000143:Acids; D058085:Iron Compounds; D010710:Phosphates; D010758:Phosphorus; D062065:Wastewater
keywords: Acid–base properties; Non-electrostatic model; Phosphate adsorption; Surface complexation; Wasted low grade iron ore with high phosphorus (WLGIOWHP)