Table of Contents
Journal of Applied Chemistry
Volume 2016, Article ID 1895854, 8 pages
http://dx.doi.org/10.1155/2016/1895854
Research Article

Preparation and Characterization of Chitosan-Humic Acid-Zerovalent Iron Nanocomposite for Nitrate Reduction in Water

1Department of Chemistry, Federal University of Agriculture Abeokuta, PMB 2240, Abeokuta, Ogun State 110001, Nigeria
2Department of Chemistry, Federal University of Agriculture, PMB 7257, Umudike, Abia State 440109, Nigeria
3Soil Science and Land Management, Federal University of Agriculture Abeokuta, PMB 2240, Abeokuta, Ogun State 110001, Nigeria

Received 20 April 2016; Revised 25 July 2016; Accepted 14 August 2016

Academic Editor: Khalid Z. Elwakeel

Copyright © 2016 Caroline Avosuahi Akinremi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A new zerovalent iron chitosan-humic acid nanocomposite was prepared and tested for nitrate ion reduction in water. Humic acid was used for intramolecular cross-linking of the chitosan linear chains to increase the active sites on the chitosan biopolymer and then further used as a stabilizer to synthesize zerovalent iron nanoparticles by the reduction of iron (II) chloride with sodium borohydride. Characterization of the products was carried out using infrared spectroscopy, scanning electron microscope, energy dispersive X-ray, and X-ray diffractometer. Batch experiments were conducted for the reduction of nitrate in water using different concentrations of the products in different concentrations of nitrate ion and at different contact time. The adsorption equilibrium data for the nitrate solution gave a favorable adsorption according to the Langmuir equation. Varying the nanocomposite-to-nitrate ion ratio generally led to faster nitrate reduction, with the pseudofirst-order rate constant for the adsorption increasing with increase in nanocomposite-to-nitrate ion ratio. Nitrate removal efficiency of zerovalent iron chitosan-humic acid nanocomposite was further confirmed using real water samples obtained from drainage waste and river with an initial nitrate concentration of and  ppm, respectively. The reduction of nitrate in water using the nanocomposite was concluded to be highly effective.