Experiment on Recovery of Phosphorus from Aqueous Solution by Calcium Doped Fe 3 O 4

Adsorption is an economical and effective method for recovering phosphate from wastewater. In order to improve the adsorption capacity of Fe O for phosphate and for easy separation from water under the action of an external magnetic field, CaO was used in this study as an oxidant to partially oxidiz...

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Bibliographic Details
Published inHuanjing kexue Vol. 40; no. 9; p. 4098
Main Authors Bai, Run-Ying, Liu, Jian-Ming, Hao, Jun-Feng, Xu, Hui, Hu, Wen-Bin, Song, Lei, Liu, Yu-Hong, Li, Hui-Dong, Zhou, Qi-Shan
Format Journal Article
LanguageChinese
Published China 08.09.2019
Subjects
Fe3O4
adsorption
wastewater
phosphate
CaO2
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Summary:Adsorption is an economical and effective method for recovering phosphate from wastewater. In order to improve the adsorption capacity of Fe O for phosphate and for easy separation from water under the action of an external magnetic field, CaO was used in this study as an oxidant to partially oxidize Fe . A phosphorus recovery adsorbent, Ca doped Fe O (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 Ca doped Fe O crystal structure with a saturation magnetization of 38.82 emu·g , 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 =25℃, the maximum adsorption capacity was 24.10 mg·g , which is almost five times the adsorption capacity of pure Fe O . The phosphorus adsorption of CMIO was in accord with the Langmuir isotherm adsorption model, and the adsorpti
ISSN:0250-3301