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In this study, experiments were carried out with natural clay in dust form, collected from Sakarya's Yenigün district using coconut shell, used as adsorbent once treated with acids such as HCl, HNO3 and H2SO4, washed, and dried. The adsorbents were then used to carry out simultaneous analyses of the adsorption of Aluminium (Al 3+ ), the presence of which in water may cause problems. The batch of experiments performed at a temperature of 293±2 K, at 200 rpm agitation rate, with an adsorbent level of 1 g/l, produced 98.95% (at pH 6) and 92.83% (at pH 7) maximum Al (III) removal efficiency for clay and coconut shell based adsorbents respectively. Furthermore, the process was found to be exothermic for Clay and endothermic for Coconut. XRF and XRD analyses of the clay variety used in adsorption analyses revealed it to be saponite clay, within the larger group of smectite group clay minerals. The application of Langmuir revealed maximum adsorption capacity of 149.25 mg/g for natural clay adsorbent (NCA), and 120.482 mg/g for coconut shell adsorbent (CSA). Moreover, adsorption kinetics were found compatible with the second order kinetics. The result shows that, clay and coconut shell adsorbents are effective adsorbents to remove Al(III) ion from aqueous solutions with good adsorption rate.

Al (III) removal from wastewaters by natural clay and coconut shell