Table of Contents
ISRN Environmental Chemistry
Volume 2013 (2013), Article ID 619819, 8 pages
http://dx.doi.org/10.1155/2013/619819
Research Article

Removal of Methyl Violet 2B from Aqueous Solution Using Casuarina equisetifolia Needle

Department of Chemistry, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Bandar Seri Begawan 1410, Brunei Darussalam

Received 28 July 2013; Accepted 12 September 2013

Academic Editors: N. N. Rao, D. Sun, and Q. Zhou

Copyright © 2013 Muhammad Khairud Dahri 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

One of the major contaminants of water bodies is dye pollutants that come from textile, paper, and leather industries. In this study, Casuarina equisetifolia needle (CEN) is used to remove methyl violet 2B (MV) from aqueous solutions. Batch experiments were done to investigate the contact time, effect of pH, initial dye concentrations, and temperature. Langmuir and Freundlich isotherm models were used to describe the interaction between the adsorbate and adsorbent. The sorption mechanism was described using Lagergren 1st order, pseudo 2nd order, and Weber-Morris intraparticle diffusion models. FTIR spectroscopy was used to analyze the functional groups of CEN before and after sorption with MV. Optimal conditions were found to be at room temperature with 2 h contact time and no pH adjustment was needed. Experimental data was best fitted onto Langmuir model with maximum adsorption capacity of 164.99 mg/g, while pseudo 2nd order best described the experimental data for the kinetics study. Thermodynamic parameters such as change in Gibbs free energy ( ), enthalpy ( ), and entropy ( ) were also investigated.