Adsorption Kinetic and Thermodynamic Studies of Phosphate onto Tantalum Hydroxide

Abstract

BSTRACT: Tantalum hydroxide exhibits the ability for the removal of phosphate from aqueous solution. The kinetic study, adsorption isotherm, thermodynamic study, desorption, and foreign anions effect were examined in batch experiments. The kinetic process was very well described by a pseudo-second-order rate model. The adsorption isotherms showed that phosphate uptake fitted with a Langmuir-type model very well, with an increase of PO4^' adsorption capacity from 78.5 to 97.0 mg/g when the temperature increased from 298 to 338 K. The negative values of zfG" and the positive values of AH" indicated that the phosphate adsorption process was spontaneous and endothermic naturally. While the Ay values obtained were positive, indicating an increase in randomness at the solid-liquid interface during the adsorption. Foreign anions tests showed that the presence of competitive ions cause minimal interference with the adsorption of phosphate on tantalum hydroxide. Water Environ. Res., 84, 2115Res., 84, (2012.

Phosphorus recovery from wastewater using pyridine‐based ion‐exchange resins: Role of impregnated iron oxide nanoparticles and preloaded Lewis acid (Cu2+)

“…Sorption‐based processes have shown promise in removing P from wastewater. Materials used as a P sorbent include fly ash (Xu et al, 2012), tantalum hydroxide (Yu et al, 2012), iron‐based filter (Allred & Racharaks, 2014), dolomite‐alginate composite beads (Huang et al, 2019), palygorskite (Fangqun et al, 2011), activated alumina (Tan et al, 2019), plaster of paris and hydrogel beads containing alumina particles (Malicevic et al, 2020), calcium‐rich rocks (Lamont et al, 2019), and zirconium oxide (Lin et al, 2017). Most metal oxide particles lack the mechanical strength and abrasion resistance properties for prolonged operation in fixed‐bed units (Blaney et al, 2007).…”

Effect of solids residence time on dynamic responses in chemical P removal

“…Empirical models such as the Elovich, first‐order, second‐order, power function, intraparticle diffusion, and parabolic diffusion models have been employed to describe the kinetics of P uptake in batch tests (Yu, Dong, Gong, Jiang, & Liu, ; Zeng, Li, & Liu, ). The Elovich equation was found to satisfactorily fit batch test data of P adsorption onto iron oxide tailings (Zeng et al., ).…”