Title: Removal of basic dyes auramine yellow and auramine O by halloysite nanotubes

Authors: Nitasha Khatri; Sanjiv Tyagi; Deepak Rawtani

Addresses: Gujarat Environment Management Institute, Ministry of Forests and Environment, Office of the Director, 3rd Floor, Block no. 13, Dr. Jivraj Mehta Bhavan, Old Sachivalaya, Sector 10, Gandhinagar, 382010 (Gujarat), India ' Gujarat Environment Management Institute, Ministry of Forests and Environment, Office of the Director, 3rd Floor, Block no. 13, Dr. Jivraj Mehta Bhavan, Old Sachivalaya, Sector 10, Gandhinagar, 382010 (Gujarat), India ' Gujarat Forensic Sciences University, Sector 18A, Near Police Bhawan, Gandhinagar, India

Abstract: A series of studies were conducted for the removal of the basic dyes auramine yellow and auramine O using halloysite nanotubes (HNTs), the low cost clay minerals ultra-structure to removes cationic dye from aqueous solution. During the study of the effect on experimental parameters such as adsorbent dose, initial concentration; initial pH, contact time and temperature by using batch adsorption technique, removal percentage of auramine increases for initial dye concentrations from 10 ppm to 15 ppm and then decreases from 15 ppm to 25 ppm. An increase in the adsorption with the adsorbent dosage was observed due to greater surface area and the availability of more adsorption sites when the number of adsorbate molecules remains constant. It was also found that maximum dye removal had occurred in basic medium. Similarly, rise in adsorption onto HNT is due to increase in rate of diffusion of adsorbate molecule, modelled using Freundlich and Langmuir adsorption isotherms with first order kinetic. In which adsorption was observed results indicate that HNTs had the potential to be employed as low-cost and relatively effective adsorbent for the removal of auramine dye.

Keywords: adsorption; dye removal; halloysite nanotubes; HNTs; auramine dyes; nanotechnology; adsorbent dose; initial concentration; initial pH; contact time; temperature; modelling; first order kinetics.

DOI: 10.1504/IJEWM.2016.076427

International Journal of Environment and Waste Management, 2016 Vol.17 No.1, pp.44 - 59

Received: 08 Oct 2014
Accepted: 19 Nov 2015
Published online: 06 May 2016 *

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