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Journal of Engineering
Volume 2013 (2013), Article ID 593534, 8 pages
Research Article

Mechanistic Study of Adsorption of Acid Orange-7 over Aluminum Oxide Nanoparticles

1Department of Chemistry, Hans Raj Mahila Maha Vidyalaya, Jalandhar, Punjab 144021, India
2Department of Food Sciences & Technology, Guru Nanak Dev University, Amritsar, Punjab 143005, India
3Krantiguru Shyamji Krishna Verma Kachchh University, Mundra Road, Bhuj, Gujarat 370001, India

Received 24 November 2012; Accepted 5 December 2012

Academic Editor: Jose M. Guisan

Copyright © 2013 Ekta Khosla 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.


The adsorption behavior of acid orange-7 (AO-7) on aluminum oxide nanoparticles (ANP) generated by sol-gel method has been investigated to understand the physicochemical process involved and to explore the potential use of nano particles in textile effluent treatment and management. The results revealed that ANP can remove AO-7 dye up to 97.6 mg/g at 303 K. The adsorption process is found to be pH dependent and the optimum pH obtained is 2.0. The equilibrium was established in 1 h. Langmuir, Freundlich, and Temkin Isotherm models were applied on the system. Scanning electron microscopic analysis reveals eye-catching nanoporous morphology of the material. The results of FTIR spectroscopy reveal that the process is electrostatic complexation mechanism driven. XRD studies revealed nanocrystalline structure of ANP. BET surface area measurement suggests high pore volume and surface area of adsorbent. The kinetic measurements suggest pseudo-second-order kinetic processes. The thermodynamic measurements suggest that all processes are endothermic accompanied with negative ΔG° and positive ΔS°, ΔH°.