Impact of groundwater anions on the arsenic remove by ball milling zero valent iron
LIU Qiu-long1,2, YANG Yu1, XIA Fu1, JIA Yong-feng1, LIAN Xin-ying1, XU Xiang-jian1, FENG Fan1, ZHANG Yan1, JIANG Yong-hai1
1. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
The effect of ball milled zero-valent iron (BZVI) on As remove was studied under different concentrations of NO3-, SO42-, H2PO4- and SiO32-. The oxidation capacity of BZVI on As(Ⅲ), transformation between As(Ⅲ) and As(V), and the corrosion products of BZVI affected by these anions were studied as well. Arsenic removal efficiency was not significantly changed under varied concentrations of NO3- and SO42-. However aqueous As (V) ratio increased from 25.1% to 83.6% accompanied by the increase of H2PO4-, while it decreased from 25.1% to 3.8% with the increase of SiO32-. Results of scanning electron microscopy images and raman spectroscopy showed that H2PO4- promoted the corrosion of BZVI, resulting in the enhanced As (Ⅲ) oxidation capacity. Besides under aqueous SiO32- the formation of silica polymer or amorphous solid phase on iron surface mainly contributed to the weakened As oxidation and adsorption capacity by BZVI.
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