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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Published in | Huanjing kexue Vol. 40; no. 9; p. 4098 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | Chinese |
Published |
China
08.09.2019
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Subjects | |
Online Access | Get more information |
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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 |
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ISSN: | 0250-3301 |