Please use this identifier to cite or link to this item:
Title: Preparation and characterization of zirconium-based magnetic sorbent for arsenate removal
Authors: Zheng, Y.-M. 
Lim, S.-F.
Chen, J.P. 
Keywords: Adsorption
Magnetic sorbent
Spectroscopic analysis
Issue Date: 1-Oct-2009
Citation: Zheng, Y.-M., Lim, S.-F., Chen, J.P. (2009-10-01). Preparation and characterization of zirconium-based magnetic sorbent for arsenate removal. Journal of Colloid and Interface Science 338 (1) : 22-29. ScholarBank@NUS Repository.
Abstract: In this study, a zirconium-based magnetic sorbent is developed by a coprecipitation technology. The characterization of the sorbent and its adsorption behavior are systematically investigated. It is shown that the sorbent has a small mean diameter of 543.7 nm, a specific surface area of 151 m2/g, and a pHzpc of 7. The sorbent has a rough surface and many pores developed on the surface. It has a molecular formula of ZrO(OH)2·1.6Fe3O4·2.5H2O, which was determined by the thermal gravimetric analysis, the elemental analysis, and the digestion experiments. The sorption equilibrium can be reached within 25 h. Better adsorption can be obtained at lower pH, and the optimal initial pH is from 2.6 to 3.3. The maximum adsorption capacity of 45.6 mg-As/g is achieved, which is much higher than many reported sorbents. FTIR spectra analysis indicates that -OH groups play an important role in the uptake. Some of the arsenate are reduced to arsenite after its adsorption onto the magnetic sorbent; the divalent iron in the sorbent may provide electrons for the reduction. A conceptual model for the adsorption of arsenate by the magnetic sorbent is proposed to illustrate the mechanism. © 2009 Elsevier Inc. All rights reserved.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2009.06.021
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jan 14, 2022


checked on Oct 20, 2021

Page view(s)

checked on Jan 13, 2022

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.