聚苯乙烯基Ce-La双金属氧化物对磷的吸附特性

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

Received: 11 March 2024

PACS:

X703.5

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

Cite this article:

LI Han,SHEN Meng-meng,LOU Ran等. Adsorption characteristics of polystyrene-based Ce-La bimetal oxides for phosphate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6201-6209.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6201

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