Equilibrium and Kinetics Studies of Phosphate Removal from Solution onto a Hydrothermally Modified Al-Si-Fe-Ca Composite Adsorbent

Abstract:

A novel Al–Si–Fe–Ca composite material for phosphate removal in wastewater treatment was made by using Al (OH)₃,Fe₂O₃,CaO and silica powder as raw materials. Sorption data modelling with a pH range of 3–12, P concentrations of 3,5,7,9, 11,13, 15mg L⁻¹, and an ambient temperature of 23°C indicated that an optimal removal of P occurred at pH 6.0. A maximum removal of 99.68% was found for 11mg L⁻¹ (pH of 6). Langmuir isotherm best described theadsorption processwith a maximumadsorption capacity of 8.60mg g⁻¹. Three kinetic models (apseudo-first-order, a pseudo-second-order (PSO) and Elovich) were also applied,and the results showed that the PSOmodel best described the data. SEM and EDAX analysis confirmed that P was adsorbed to the surface of the composite material. This study demonstrates that the composite adsorbent is suitable for use in wastewater treatment, with P removal of the solids being preferential and spontaneous.

• Periodical: Materials Science Forum (Volume 787)
• Pages: 128-134
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.787.128
• Online since: April 2014
• Authors: Qiong Wu, Rui Rong You, Qiu Ping Wu, Fei Yun Chen, Yan Yu*
• Keywords: Adsorption Equilibrium, Adsorption Kinetics, Al-Si-Fe-Ca Composite Adsorbent, Phosphate Adsorption

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