Abstract
Abstract The potential of tropical fruit waste (durio zibethinus husk, DZH) as a low-cost adsorbent for removal of disperse blue 60 (DB 60) from an aqueous medium was studied under various conditions such as effects of adsorbent surface modification, contact time, pH, and temperature. The removal percentage of DB 60 was enhanced by approximately a factor of six when using the DZH treated by mineral acid compared to the untreated DZH. The functional groups of DZH before and after acid treatment were analyzed by Fourier transform infrared spectroscopy to elucidate these results. The surface structure of the DZH before and after adsorption was analyzed by field emission scanning electron microscopy. Adsorption equilibrium isotherms and kinetics of the DZH were studied using Langmuir and Freundlich models, as well as pseudo-first-order, second-order kinetic and intraparticle diffusion equations. The Langmuir isotherm model agreed well with the experimental data with a maximum adsorption capacity (q max) of 54...
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