Citation: 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. doi: 10.11862/CJIC.2018.181 shu

Synthesis and Phosphorus Adsorption of Coal-Fly-Ash Magnetic Adsorbents

1.
Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China
2.
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong 2500, Australia

Corresponding author: LI Jian-Jun, ljjhero4@gmail.com
Received Date: 28 February 2018
Revised Date: 20 May 2018

Figures(11)

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. CO₃^2- and SO₄^2- 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.
- magnetic adsorbent,
- coal-fly-ash magnetic sphere,
- lanthanum oxide,
- magnetic separation,
- P adsorption,
- surface hydroxylation-ion exchange
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沈阳化工大学材料科学与工程学院沈阳 110142