Development of new biosorbent materials from agricultural waste materials for the removal of Cd(Ⅱ) ions from aqueous solution through the batch adsorption process

摘要

The investigation of the potentials of the acid modified Africa elemi seed, mucuna shell, and oyster shell as an adsorbent for the removal of cadmium ions from aqueous solution using batch adsorption was carried out. The material characterization was carried out using Fourier transform infrared and scanning electron microscopy. The effects of operational variables like adsorbent dosage, pH, and contact time in the removal of Cd(Ⅱ) ion was investigated. The equilibrium adsorption isotherm and kinetic behavior for MSA (mucuna shell adosrbent), AESA (Africa elemi seed adsorbent), and OSA (oyster shell adsorbent), respectively, were determined. From the result, it is shown that the adsorbents can remove both anionic and cationic particles. The result obtained showed that at 40 min contact time, 60 mg adsorbent dose, and solution pH of 8, the in maximum Cd(Ⅱ) uptake was noticed. Among the three isotherm models applied, Lang-muir provides the best fit. Under optimum conditions, the adsorption capacity of AESA, MSA, and OSA, was obtained as 110.6,74.87, and 104.5, respectively. The correlation coefficient (R~2) for AESA, MSA, and OSA was 0.996,0.988, and 0.980, respectively. The experimental data for kinetic study follows the pseudo-second-order model.