Research Article | OPEN ACCESS
Preparation of Nano Iron Oxide Coated Activated Sludge Granules and its Adsorption Properties for Cd (II) Ions in Aqueous Solutions
1Muhammad Hashemifar, 1Ghodratolah ShamsKhorramabady, 1HatamGodini, 2Nazila Nilufari 3Marjan Mehrabpour, 4Mojtaba Davoudi
1Department of Environmental Health Engineering, School of Public Health,, lorestan University of Medical Sciences, lorestan
2Department of Environmental Health Engineering, School of Public Health, Urmia University, Urmia
3Department of Environmental Health Engineering, Health Science Research Center, School of Health, Mashhad University of Medical Sciences, Mashhad
4Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
Research Journal of Environmental and Earth Sciences 2014 5:259-265
Received: December 21, 2013 | Accepted: January 15, 2014 | Published: May 20, 2014
Abstract
The purpose of this study is Preparation of nano iron oxide coated activated sludge granules and its adsorption properties for Cd (II) ions in aqueous solutions. Activated sludge as biosorbent was modified using nano iron oxide coating and examined for removal of cadmium ions from aqueous solutions. The effect of parameters including amount of coating, contact time, solution pH, initial Cd concentration and adsorbent dosage was evaluated in batch experiments. The results showed that percentage removal of 91.6 was achieved by using modified sludge at alkaline pH 9 and contact time 120 min. The uptake of cadmium was best described by Langmuir-Freundlich isotherms. The kinetic study revealed that Cd (II) adsorption was in agreement with pseudo second-order equation. The Cd (II) loaded and unloaded granules were analyzed using Scanning Electron Microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Based on the obtained results, the modified activated sludge granules with nano iron oxide are an efficient adsorbent for removal of cadmium ions as inorganic water and wastewater pollutant.
Keywords:
Adsorption isotherms, biosorbent, heavy metals, nano iron oxide,
Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright
The authors have no competing interests.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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