Simultaneous and efficient removal of fluoride and phosphate by Fe-La composite: Adsorption kinetics and mechanism

By Jia Wang, Liying Wu, Jun Li, Dandan Tang, Gaoke Zhang. Journal of Alloys and Compounds, 2018

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Abstract We report the synthesis of a novel Fe-La composite adsorbent by one-pot hydrothermal method for removing fluoride and phosphate simultaneously. The as-obtained adsorbent shows rod-like morphology and large specific surface area of 113.13 m2/g. A series of adsorption experiments were carried out to investigate the influence of various factors on the simultaneous adsorption of fluoride and phosphate, such as different adsorbent dosage, pH, temperature and co-existing anion. The results demonstrate that the Fe-La adsorbent exhibited high adsorption capacity for fluoride and phosphate in a wide pH range (3.8–7.1). The adsorption kinetics of fluoride and phosphate by Fe-La composite could be well described by the Langmuir model and the pseudo-second-order model. The simultaneous removal of fluoride and phosphate by Fe-La composite could be ascribed to ion exchange between fluoride and La-OH groups, as well as the formation of metal phosphates precipitation, respectively. Our results may provide some insight to develop new adsorbents for removing fluoride and phosphate simultaneously.

Subfields: Geochemistry and Petrology, Industrial and Manufacturing Engineering, Water Science and Technology

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