Annual Research & Review in Biology, ISSN: 2347-565X,Vol.: 4, Issue.: 17 (1-15 September)

Original-research-article

Azo Dye Removal from Aqueous Solutions Using Laccase-modified Red Mud: Adsorption Kinetics and Isotherm Studies

 

H. Nadaroglu^1*, E. Kalkan² and N. Celebi¹

¹Ataturk University, Erzurum Vocational Training School, 25240 Erzurum, Turkey.
²Ataturk University, Oltu Earth Sciences Faculty, Geological Engineering Department, 25400 Oltu-Erzurum, Turkey.

Article Information

Editor(s):

(1) Prof. George Perry, Dean and Professor of Biology, University of Texas at San Antonio, USA.

Reviewers:

(1) Usha Mukundan, Ramniranjan Jhunjhunwala College, India.  

(2) Anonymous

Complete Peer review History:http://www.sciencedomain.org/review-history/4470

Removal of acid red 37 from aqueous solutions has been studied using red mud waste material after its modification with laccase from Russulaceae (Lactarius volemus). Laccase was purified by using saturated precipitate (NH₄)₂SO₄, diethylaminoethyl celulose (DEAE-cellulose) and immobilized on red mud. The removal of acid red 37 by the laccase-modified red mud has been demonstrated in order to explore its potential use as low-cost adsorbent. The adsorption kinetics of acid red 37 dye on the laccase-modified red mud with respect to pH, contact time, temperature and adsorbent dose were investigated. The optimum results were obtained at pH 4, contact time of 60 min and temperature of 30ºC. The Freundlich equation was found to have the highest value of R² compared with the Langmuir model. Thermodynamic parameters including the Gibbs free energy, enthalpy and entropy changes indicated that the adsorption of acid red 37 onto laccase-modified red mud was feasible, spontaneous and endothermic.

Keywords :

Laccase-modified red mud; acid red 37; dye removal; adsorption isotherm; wastewater.

Full Article - PDF    Page 2730-2754

DOI : 10.9734/ARRB/2014/10080

Review History    Comments