ORIGINAL RESEARCH
Tobacco Stalk Waste Biomass Holds Multilayer and Spontaneous Adsorption Capabilities for Reactive Black 5 Dye: Equilibrium Modelling and Error Function Analysis
 
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1
Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, 22060, Abbottabad, Pakistan
2
Department of Civil Engineering, University of Hail, Hail Province, 55476, Saudi Arabia
3
Department of Environmental Sciences, University of Haripur, 22620, KP, Pakistan
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Department of Soil Science, Bahauddin Zakariya University, Multan, 60800, Punjab, Pakistan
5
Department of Biotechnology, COMSATS University Islamabad, Abbottabad Campus, 22060, Abbottabad, Pakistan
6
Energy Research Centre (ERC) COMSATS University Islamabad, Lahore Campus, 54000, Lahore
CORRESPONDING AUTHOR
Muhammad Bilal   

Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Pakistan
Submission date: 2020-02-27
Final revision date: 2020-07-27
Acceptance date: 2020-07-29
Online publication date: 2021-01-28
 
 
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ABSTRACT
Tobacco stalk biomass (TSB) is explored for reactive black 5 (RB5) dye treatment in batch reactor. TSB displayed RB5 adsorption efficiency of 93.5% at 120 min. The RB5 data were fitted to linear and non-linear isotherms and kinetic models. Error functions were determined to have a holistic view on optimum parameters and to validate prediction of models. Harkin-Jura exhibited better fit than that of Freundlich and Langmuir isotherms suggesting multilayer adsorption of RB5 onto TSB on the basis of R2 and chi-square (χ2) error values. Adsorption kinetics was best explained by intraparticle diffusion model (IPD) at increasing initial concentration of RB5. Among the error functions evaluated, the χ2 values for the IPD model were found to be smaller than those for PSO. This suggests that kinetics of RB5 dye is better controlled by IPD phenomenon. Fourier transform infrared spectroscopy confirms the physical adherence of dye to the adsorbent. Values of Gibbs free energy were found to be -19.55 -21.41, -23.40 and -25.33 kJ/mol which shows spontaneous adsorption. Moreover, it is found that TSB adsorbent could be utilized as the effective and economically viable adsorbent for RB5 dye from aqueous solution.
eISSN:2083-5906
ISSN:1230-1485