Didik Supriyadi, Darmansyah, Ratna Puspita Sari, Amna Citra Farhani
The experimental data analysis of tapioca liquid waste onto modified Lampung natural zeolite using non-linear regression models is limited. The adsorption data were analyzed with nine kinetic models (the pseudo-first-order, the pseudo-second-order, the intraparticle diffusion, fractional power, Bangham, Elovich, mixed-1.2-order, modification of pseudo-second-order, and Avrami) and eight isotherm models (Langmuir, Freundlich, Dubinin-Radushkevich, Sips, Redlich-Peterson, Toth, Liu, and Khan). The percentage of adsorption was decreased from 61.29% to 13.66% with increasing Chemical Oxygen Demand (COD) concentration 310 mg/L to 9450 mg/L. The result showed that the power model (R2: 0.98, X2: 0.137), Avrami (R2: 0.98, X2: 0.141), Bangham (R2: 0.98, X2: 0.145) and modified pseudo-second-order (R2: 0.98, X2: 0.147) can be recommended as the best fitted to experimental kinetic data. The Khan model (R2: 0.99961, X2: 0.03729) and Langmuir (R2: 0.99478, X2: 0.24902) was the most reliable for describing the isotherm model. Thus, the analysis of experimental adsorption data using a non-linear regression model is highly recommended. © 2021 The Authors.
Department of Chemical Engineering, Institut Teknologi Sumatera, Lampung Selatan, 35365, Indonesia; Department of Chemical Engineering, University of Lampung, Bandar Lampung, 35365, Indonesia; Department of Biosystems Engineering, Institut Teknologi Sumatera, Lampung Selatan, 35365, Indonesia
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