Adsorption of ethidium bromide from aqueous solution onto nutraceutical industrial fennel seed spent: Kinetics and thermodynamics modeling studies |
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| Authors: | Razia Sulthana Syed Noeman Taqui Farhan Zameer Usman Taqui Syed |
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| Affiliation: | 1. Department of Studies in Chemistry, University of Mysore, Manasa Gangothri, Mysore, Karnataka, India;2. Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia;3. Mahajana Life Science Research Laboratory, Department of Biotechnology, Microbiology and Biochemistry, Mahajana Research Foundation, Pooja Bhagavat Memorial Mahajana Post Graduate Centre, University of Mysore, Metagalli, Mysore, Karnataka, India;4. LAQV-REQUIMTE, Department of Chemistry, Faculty of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal |
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| Abstract: | Dye pollutants from research laboratories are one of the major sources for environmental contamination. In the present study, a nutraceutical industrial fennel seed spent (NIFSS) was explored as potential adsorbent for removal of ethidium bromide (EtBr) from aqueous solution. The adsorbent was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Through batch experiments, the operating variables like initial dye concentration, adsorbent dosage, temperature, contact time, and pH were optimized. Equilibrium data were analyzed using three number of two-parameter and six number of three-parameter isotherm models. The adsorption kinetics was studied using pseudo-first order and pseudo-second order. The diffusion effects were studied by film diffusion, Webber–Morris, and Dumwald–Wagner diffusion models. The thermodynamic parameters; change in enthalpy (ΔHº), entropy (ΔSº), and Gibbs free energy (ΔGº) of adsorption system were also determined and evaluated. |
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| Keywords: | Adsorption studies ethidium bromide nutraceutical industrial fennel seed spent |
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