Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.colsurfa.2010.06.018
Title: Synthesis of carboxymethyl-β-cyclodextrin conjugated magnetic nano-adsorbent for removal of methylene blue
Authors: Badruddoza, A.Z.M.
Hazel, G.S.S.
Hidajat, K. 
Uddin, M.S. 
Keywords: β-Cyclodextrin
Adsorption
Desorption
Isotherms
Kinetic model
Magnetic nanoparticles
Methylene blue
Issue Date: Sep-2010
Source: Badruddoza, A.Z.M., Hazel, G.S.S., Hidajat, K., Uddin, M.S. (2010-09). Synthesis of carboxymethyl-β-cyclodextrin conjugated magnetic nano-adsorbent for removal of methylene blue. Colloids and Surfaces A: Physicochemical and Engineering Aspects 367 (1-3) : 85-95. ScholarBank@NUS Repository. https://doi.org/10.1016/j.colsurfa.2010.06.018
Abstract: A novel nano-adsorbent is fabricated by the surface modification of Fe3O4 nanoparticles (MNP) with carboxymethyl-β-cyclodextrin (CM-β-CD) and the feasibility of employing these nano-adsorbents for removal of methylene blue (MB) from aqueous solutions are investigated. CMCD-MNP(C) and CMCD-MNP(P) are fabricated by grafting CM-β-CD on the surface of magnetite by covalent bonding via carbodiimide method (two-steps method) and by co-precipitation method (one-step method), respectively. Analyses by TEM and VSM reveal that both CMCD-MNP(C) and CMCD-MNP(P) are superparamagnetic with mean diameter of about 12nm. The CM-β-CD grafting is confirmed by FTIR, TGA and zeta potential measurement. The TGA results show that CM-β-CD grafted onto CMCD-MNP(C) and CMCD-MNP(P) is 4.7 and 12wt%, respectively. The adsorption of MB on both adsorbents is found to be dependant on pH, and initial MB concentration. Almost constant MB removal is found in the pH range of 4-10 and more MB is adsorbed at pH∼12. The kinetic data for MB adsorption is found to follow a pseudo-second-order kinetic model. The equilibrium data in aqueous solutions are well represented by the Langmuir isotherm model. The adsorption capacities of methylene blue onto CMCD-MNP(P) and CMCD-MNP(C) are found to be 277.8 and 140.8mg/g, respectively and the negative value of free energy changes indicates the spontaneous nature of adsorption. The adsorbed MB can be desorbed by using methanol solution containing acetic acid. In addition, adsorption mechanism of MB is studied through FTIR analysis. © 2010 Elsevier B.V.
Source Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
URI: http://scholarbank.nus.edu.sg/handle/10635/90270
ISSN: 09277757
DOI: 10.1016/j.colsurfa.2010.06.018
Appears in Collections:Staff Publications

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

SCOPUSTM   
Citations

121
checked on Feb 14, 2018

WEB OF SCIENCETM
Citations

117
checked on Jan 23, 2018

Page view(s)

55
checked on Feb 19, 2018

Google ScholarTM

Check

Altmetric


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