Methylene blue contaminated water sanitization with alginate/compact discs waste-derived activated carbon composite beads: Adsorption studies

The adsorption behavior of different adsorbents has been studied by various research works. But few studies have compared linear and non-linear isotherm and kinetic models alongside phenomenological coefficients. Here, the effect of activated carbon black (ACB) on the methylene blue adsorption behavior of alginate was examined. A low-cost and green adsorbent was fabricated to can easily be detached from water. For this aim waste compact discs were recycled for the preparation of ACB. Loading of 15 wt% ACB related to pure alginate increased removal yield of alginate significantly. Isotherms and kinetic models in linear and non-linear forms were studied and the results were examined by comparing R-2 along with different error function values to find the best fitting. The results were well matched with non-linear pseudo-second-order and linear Langmuir. Intraparticle diffusion model and phenomenological coefficients represented control of adsorption by film diffusion and its limiting by pore diffusion. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study investigated the influence of activated carbon black on the adsorption behavior of methylene blue by alginate. A low-cost and green adsorbent was prepared using recycled waste compact discs. Results showed a significant increase in alginate removal yield with the addition of 15 wt% activated carbon black. Various isotherm and kinetic models were compared, with non-linear pseudo-second-order and linear Langmuir showing the best fitting to the experimental data.