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| Synthesis and Phosphorus Adsorption of Coal-Fly-Ash Magnetic Adsorbents |
| Author Name | Affiliation | E-mail | | LI Jian-Jun | Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong 2500, Australia | ljjhero4@gmail.com | | DAN Hong-Bing | Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China | | | XIE Wei | Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China | | | Islam Nazrul | Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong 2500, Australia | | | YANG Lu-Min | Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China | | | YE Xian-Kang | Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China | | | ZHU Jin-Bo | Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China | |
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| Abstract: Magnetic phosphorus adsorbent coal-fly-ash magnetic sphere@La2O3 (CMS@La2O3) was synthesized by a chemical precipitation method, using CMS as magnetic core. Structural and magnetic characterization shows that Lanthanum oxide is uniformly coated on the surface of CMSs. The magnetism of the prepared CMS@La2O3 is measured as 20.35 emu·g-1, which is strong enough for effective magnetic separation. The P adsorption performance of the CMS@La2O3 was investigated by the ammonium molybdate spectrophotometric method. It is found that the P adsorption of CMS@La2O3 is closely related to the adsorption time, pH value, and coexisting anions in the wastewater. The highest P adsorption was measured as 19.50 mg·g-1. CO32- and SO42- in the waste water could sharply reduce the P adsorption even in a very low concentration by occupying the P-adsorption site on the La2O3 surface, while the existing of Cl- ions has very little effect on the P adsorption. The P adsorption of CMS@La2O3 is well accordant with the pseudo-second order kinetics equation, indicating that it is dominated by the chemical adsorption. The adsorption reaction could be explained by the "surface hydroxylation-ion exchange" model on the La2O3 surface. The used CMS@La2O3 adsorbent could be recycled for several times after appropriate treatment. |
| Keywords: magnetic adsorbent coal-fly-ash magnetic sphere lanthanum oxide magnetic separation P adsorption surface hydroxylation-ion exchange |
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| LI Jian-Jun,DAN Hong-Bing,XIE Wei,Islam Nazrul,YANG Lu-Min,YE Xian-Kang,ZHU Jin-Bo.Synthesis and Phosphorus Adsorption of Coal-Fly-Ash Magnetic Adsorbents[J].Chinese Journal of Inorganic Chemistry,2018,34(8):1455-1462. |
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