An investigation of phosphate adsorption from aqueous solution onto hydrous niobium oxide prepared by co-precipitation method

作者：Rodrigues Liana Alvares; Caetano Pinto da Silva Maria Lucia

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2009, 334(1-3): 191-196.

DOI：10.1016/j.colsurfa.2008.10.023

• Adsorption
• Phosphate
• Desorption

The synthetic hydrous niobium oxide has been used for phosphate removal from the aqueous solutions. The kinetic data correspond very well to the pseudo second-order equation The phosphate removal tended. to increase with a decrease of pH. The equilibrium data describe very well the Langmuir isotherm. The peak appearing at 1050 cm(-1) in IR spectra after adsorption was attributed to the bending vibration of adsorbed phosphate. The adsorption capacities are high, and increased with increasing temperature. The evaluated Delta G degrees and Delta H degrees indicate the spontaneous and endothermic nature of the reactions. The adsorptions occur with increase in entropy (Delta S positive) value suggest increase in randomness at the solid-liquid interface during the adsorption. A phosphate desorbability of approximately 60% was observed with water at pH 12, which indicated a relatively strong bonding between the adsorbed phosphate and the sorptive sites on the surface of the adsorbent.

• 出版日期2009-2-20