Acid-base properties and surface complexation modeling of phosphate anion adsorption by wasted low grade iron ore with high phosphorus.
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.
['Yuan|Xiaoli|X|', 'Bai|Chenguang|C|', 'Xia|Wentang|W|', 'An|Juan|J|']
D000143:Acids D000327:Adsorption D058085:Iron Compounds D010710:Phosphates D010758:Phosphorus D017550:Spectroscopy, Fourier Transform Infrared D013499:Surface Properties D014865:Waste Disposal, Fluid D062065:Waste Water
Surface complexation Wasted low grade iron ore with high phosphorus (WLGIOWHP) Non-electrostatic model Acid–base properties Phosphate adsorption