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Adsorption Kinetic and Thermodynamic Studies of Phosphate onto Tantalum Hydroxide

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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 3- adsorption capacity from 78.5 to 97.0 mg/g when the temperature increased from 298 to 338 K. The negative values of ΔG0 and the positive values of ΔH0 indicated that the phosphate adsorption process was spontaneous and endothermic naturally. While the ΔS0 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.

Keywords: desorption; kinetics; mechanism; phosphate adsorption; tantalum hydroxide; thermodynamics

Document Type: Research Article


Affiliations: 1: School of Chemistry and Material Science, Liaoning Shihua University, Fushun. 2: Center of Analysis and Measurement, Jilin Institute of Chemical Technology, Jilin City.

Publication date: December 1, 2012

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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