Adsorption characteristics of polystyrene-based Ce-La bimetal oxides for phosphate

LI Han; SHEN Meng-meng; LOU Ran; CHEN Jia-chao; CHEN Zhi-hui; ZHU Ya-xian; YANG Wen-lan

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China Environmental Science ›› 2024, Vol. 44 ›› Issue (11) : 6201-6209.

Water Pollution Control

Adsorption characteristics of polystyrene-based Ce-La bimetal oxides for phosphate

LI Han^1,2, SHEN Meng-meng¹, LOU Ran¹, CHEN Jia-chao¹, CHEN Zhi-hui¹, ZHU Ya-xian¹, YANG Wen-lan¹

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Abstract

Ce-La bimetal oxides (CLBOs) nanoparticles were immobilized within the pores of a polystyrene anion exchanger (PAE) to fabricate a polystyrene-based nanocomposite CLBOs@PAE for efficient phosphate removal from acidic wastewater. Experimental results indicated that CLBOs@PAE exhibited excellent stability at pH≥3, and acidic conditions favor its adsorption of phosphate. At a pH of 4 and an initial phosphate concentration of 30mg/L, the maximum phosphate adsorption capacity reached 56.71mg/L. The phosphate adsorption process of CLBOs@PAE followed pseudo-second-order kinetics, achieving adsorption equilibrium within 180minutes. Benefiting from the preferential adsorption of embedded CLBOs nanoparticles towards phosphate (involving hydroxyl ligand exchange and inner-sphere complexation), CLBOs@PAE showed significant phosphate adsorption selectivity in the presence of high concentrations of coexisting anions (SO₄^2-, HCO₃^-, NO₃^- and Cl^-). Fixed-bed adsorption experiments demonstrated that at an influent phosphate concentration of 5mg/L, CLBOs@PAE exhibited an effective treatment capacity of up to 5000BV before reaching the breakthrough point (0.5mg/L). Moreover, CLBOs@PAE displayed excellent desorption and regeneration properties, maintaining a relatively stable adsorption capacity over long-term cyclic use, highlighting its promising potential for phosphate removal in acidic wastewater treatment.

Key words

acidic wastewater / Ce-La bimetal oxides / efficient removal / phosphate / polystyrene anion exchanger

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LI Han, SHEN Meng-meng, LOU Ran, CHEN Jia-chao, CHEN Zhi-hui, ZHU Ya-xian, YANG Wen-lan. Adsorption characteristics of polystyrene-based Ce-La bimetal oxides for phosphate[J]. China Environmental Science. 2024, 44(11): 6201-6209

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