Optical Detection and Efficient Removal of Transition Metal Ions from Water using Poly(hydroxamic acid) Ligand

Lutfor, M. R. and Sarkar, Shaheen M. and M. M., Yusoff and Mohd Harun, Abdullah (2017) Optical Detection and Efficient Removal of Transition Metal Ions from Water using Poly(hydroxamic acid) Ligand. Sensors and Actuators B: Chemical, 242. pp. 595-608. ISSN 0925-4005. (Published)

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Abstract

A copolymer, cellulose-graft-poly(methyl acrylate), was synthesized by a free-radical initiating process, and the ester functional groups converted into the hydroxamic acid ligand. The pH of the solution acts as a key factor in achieving optical color signals of metal-complexation. The reflectance spectra of the [M-ligand]n+ complex was found to be at the highest absorbance, ranging from 92 to 99% at pH 6, with absorbance noted to increase as metal ion concentrations were increased. A broad peak at 673 nm for Cu2+ was observed, indicating the presence of the charge transfer (π–π transition) complex. The developed ligand demonstrated superior adsorption capacity for copper (305.3 mg g−1), as well as strong adsorption capacity for other metals; the adsorption capacities for Fe3+, Mn2+, Co2+, Cr3+, Ni2+, and Zn2+ were 275.6, 258.5, 256.6, 254.3, 198.5, and 190.1 mg g−1, respectively. The experimental data of the adsorption kinetics of the metal ions fitted well with a pseudo-second-order rate equation. The obtained data demonstrated that the observed metal ion sorption was well fitted with the Langmuir isotherm model (R2 > 0.99), suggesting that the surface of the adsorbent is homogenous and monolayer. The reusability of the ligand was verified using the sorption/desorption process, demonstrating that the developed adsorbent can be reused for 12 cycles without significant loss of its original sensing and removal performance.

Item Type:	Article
Uncontrolled Keywords:	Optical detection; Poly(hydroxamic acid); Transition metals; Adsorption; Complexation
Subjects:	Q Science > Q Science (General)
Faculty/Division:	Faculty of Industrial Sciences And Technology
Depositing User:	Mrs. Neng Sury Sulaiman
Date Deposited:	25 Apr 2017 05:59
Last Modified:	14 Feb 2018 08:21
URI:	http://umpir.ump.edu.my/id/eprint/16398
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