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- Title
Enhanced adsorption of Pb(II) from aqueous solution by magnesium-incorporated hydroxyapatite with poor crystalline structure.
- Authors
Min Zhou; Xinlong Yan; Hong Zou; Yaqin Zhao; Ningning Yin; Can Zhang; Liping Wang
- Abstract
In this work, magnesium-incorporated hydroxyapatite (MHAP), with a poor crystalline structure was synthesized using a sol-gel method to remove lead from aqueous solutions. The results show that the adsorption capacity of MHAP for lead greatly increased compared with that of hydroxyapatite, which exhibits an adsorption capacity of 227.1 mg g-1 at an initial lead concentration of 550 mg L-1 at 30°C. This capacity is higher than that of previously reported hydroxyapatite-related adsorbents. In addition, the adsorption isotherm could be better described by a Langmuir isotherm, and the adsorption kinetics conformed to the pseudo-second-order model. The MHAP removes lead via dissolution-precipitation reaction. During the adsorption process, the MHAP was converted to hydroxyapatite [(Pb10(PO4)6(OH)2) or (Pb5(PO4)3OH)] as well as calcium lead phosphate hydroxide (Ca2Pb8(PO4)6(OH)2 and lead phosphate (Pb9(PO4)6).
- Subjects
CRYSTAL structure; HYDROXYAPATITE; AQUEOUS solutions; ADSORPTION isotherms; ADSORPTION (Chemistry); ADSORPTION capacity
- Publication
Desalination & Water Treatment, 2019, Vol 171, p183
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2019.24762