Simultaneous removal of phosphate and fluoride by calcium peroxide in a binary system: performance and mechanisms
Qili Hu1,2, Siting Ma2, Xingyue Yang2
1College of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering Zigong 643000 China huqili@suse.edu.cn zxjcd@suse.edu.cn.
None:
In response to the challenge of simultaneous removal of phosphate and fluoride from wastewater, this study synthesized calcium peroxide (CaO2) by chemical precipitation and explored the effects of reaction time, CaO2 dosage, initial pH and coexisting anions on their removal performance in a binary system. The physicochemical properties of CaO2 were analyzed by field emission scanning electron microscope (FE-SEM), energy dispersive spectrometer (EDS), automatic surface area and porosity analyzer (BET) and laser particle size analyzer (LPSA). The dynamic removal processes of phosphate and fluoride in the binary system were analyzed by the pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models, and their mass transfer behaviors were revealed by the Furusawa-Smith and Vermeulen models. X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were further used to clarify the removal mechanisms of phosphate and fluoride in the single and binary systems. This study aimed to provide a practical and feasible strategy for efficient phosphate and fluoride removal in wastewater treatment.
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