中文关键词过氧化钙(CaO₂)四氧化三铁(Fe₃O₄)磷酸盐吸附废水 英文关键词CaO₂Fe₃O₄phosphateadsorptionwastewater

作者	单位	E-mail
白润英	内蒙古工业大学土木工程学院, 呼和浩特 010051	bry@imut.edu.cn
刘建明	内蒙古工业大学土木工程学院, 呼和浩特 010051
郝俊峰	内蒙古工业大学土木工程学院, 呼和浩特 010051
徐慧	内蒙古工业大学土木工程学院, 呼和浩特 010051
胡文斌	内蒙古工业大学土木工程学院, 呼和浩特 010051
宋蕾	内蒙古工业大学土木工程学院, 呼和浩特 010051
刘宇红	内蒙古工业大学土木工程学院, 呼和浩特 010051
李会东	内蒙古工业大学土木工程学院, 呼和浩特 010051
周琦善	内蒙古工业大学土木工程学院, 呼和浩特 010051

中文摘要 吸附法是回收水中磷酸盐经济有效的方法之一，为提高四氧化三铁（Fe₃O₄）对磷酸盐的吸附能力，且保证其在外加磁场的作用下仍易于从水中分离，本研究选取过氧化钙（CaO₂）作为氧化剂部分氧化Fe²⁺制备了磷回收吸附剂——Ca掺杂Fe₃O₄（CMIO），并利用XRD、XRF和VSM等技术对CMIO进行表征.结果表明，CMIO为嵌入Ca²⁺的Fe₃O₄晶型结构，其饱和磁化强度为38.82 emu·g^-1，在外加磁场作用下易从水中分离.CMIO对磷的吸附容量随pH增加而降低，在pH=2，T=25℃时达到最大吸附容量24.10 mg·g^-1，几乎是纯Fe₃O₄吸附容量的5倍.CMIO对磷的吸附符合Langmuir等温吸附模型，其吸附过程遵循准二级动力学模型.磷酸盐在CMIO内表面发生络合反应，形成了≡Fe-Ca-P三元复合物，从而吸附磷.与水中其他阴离子相比，CMIO对PO₄^3-有良好的选择吸附性，且吸附的PO₄^3-可用NaOH溶液解吸；CMIO每循环利用一次质量减少不超过4%，可多次循环利用. 英文摘要 Adsorption is an economical and effective method for recovering phosphate from wastewater. In order to improve the adsorption capacity of Fe₃O₄ for phosphate and for easy separation from water under the action of an external magnetic field, CaO₂ was used in this study as an oxidant to partially oxidize Fe²⁺. A phosphorus recovery adsorbent, Ca doped Fe₃O₄ (CMIO), was prepared and was characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) and vibrating sample magnetometer (VSM) techniques. The results showed that CMIO had a Ca²⁺ doped Fe₃O₄ crystal structure with a saturation magnetization of 38.82 emu·g^-1, which was easily separated from water by using an external magnetic field. The phosphorus adsorption capacity of the CMIO decreased with an increase of pH value. When pH=2 and T=25℃, the maximum adsorption capacity was 24.10 mg·g^-1, which is almost five times the adsorption capacity of pure Fe₃O₄. The phosphorus adsorption of CMIO was in accord with the Langmuir isotherm adsorption model, and the adsorption process followed the pseudo-second order kinetic model. The complexation of phosphate occurred on the inner surface of the CMIO to form a ≡Fe-Ca-P ternary complex, which can adsorb phosphorus. Compared with other anions in the aqueous solution, CMIO had good adsorption selectivity to PO₄^3-, and the adsorbed PO₄^3- could be desorbed by NaOH solution.The quality loss of the CMIO was less than 4% once, and multiple recycling was possible.

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