磷酸盐
零价铁
铁
吸附
化学
傅里叶变换红外光谱
氧烷
无机化学
降水
水合氧化铁
磷酸铁
核化学
红外光谱学
光谱学
化学工程
有机化学
吸附
物理
量子力学
气象学
工程类
作者
Ying Zhao,Li Qingxu,Qiantao Shi,Beidou Xi,Xinyi Zhang,Zhiqiang Jian,Gaoting Zhou,Xiaoguang Meng,Xuhui Mao,Dongpeng Kang,Bin Gong
标识
DOI:10.1016/j.seppur.2023.123706
摘要
Extensive studies have been carried out on phosphate removal by zero valent iron (ZVI). Different mechanisms of phosphate removal by ZVI such as phosphate adsorption and precipitation of ferric phosphate and vivianite (Fe3(PO4)2·8H2O) have been reported. In this study, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray powder diffraction (XRD), and X-ray absorption near edge spectroscopy (XANES) were used to elucidate the mechanisms of phosphate removal by micron-scale zero-valent (mZVI). Time-series ATR-FTIR analysis revealed that phosphate was removed by ZVI in two steps: a) adsorption of phosphate in the first 3 days, and b) slow conversion of the adsorbed phosphate into the precipitated form in 6 days. XRD and XANES analysis determined that iron oxides, ferric ion, and ZVI with oxide layer inhibited the formation of vivianite, resulting in the formation of phosphate precipitates, such as H2Fe(II)P2O7. The results suggested that phosphate is removed by ZVI mainly through precipitation under aerobic conditions. The knowledge gained in this study improves the fundamental understanding of the phosphate removal processes via ZVI.
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