Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; Xiangshan Branch of Ningbo Environmental Protection Bureau, Ningbo 315700, China.
Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Water Sci Technol. 2021 Jul;84(1):216-224. doi: 10.2166/wst.2021.211.
This study shows the effectiveness of a novel electrocoagulation process using magnetically attracted iron scrap anodes for phosphate removal from aqueous solution. The effect of contact time, reaction temperature, dose of iron scrap, initial phosphate concentration, applied voltage, pH, magnetic force, and the species of competing anions on the efficiency of phosphate removal and the reaction products has been investigated. The techniques of XRD, XPS, and VSM were used to characterize the elemental composition and the types of the reaction products in order to clarify the interaction between novel anode and phosphate ions. The removal of phosphate was fitted by a pseudo first-order reaction kinetic model. The results showed that magnetically attracted iron scrap anodes were electrodissoluted under an applied potential and reacted with phosphate into Fe-hydroxo-phosphate complexes. The work suggested that electrocoagulation using magnetically attracted iron scrap anodes had the potential to become a promising technique for phosphate precipitation.
本研究展示了一种新型电凝聚工艺的有效性，该工艺使用磁性吸引的废铁阳极从水溶液中去除磷酸盐。考察了接触时间、反应温度、废铁剂量、初始磷酸盐浓度、施加电压、pH 值、磁场和竞争阴离子的种类对磷酸盐去除效率和反应产物的影响。采用 XRD、XPS 和 VSM 技术对反应产物的元素组成和类型进行了表征，以阐明新型阳极与磷酸盐离子之间的相互作用。通过准一级反应动力学模型对磷酸盐的去除进行拟合。结果表明，在施加的电势下，磁性吸引的废铁阳极发生电溶解，并与磷酸盐反应生成 Fe-羟基磷酸盐络合物。该研究表明，使用磁性吸引的废铁阳极进行电凝聚有可能成为一种有前途的磷酸盐沉淀技术。
