Abstract
Watermelon Shell, an agricultural waste, was employed for the adsorptive removal of chromium (II) ion Cr 2+ from textile effluent. This study analysed the adsorbent's active sites and morphological structures using FT-IR, SEM, XRD, and XRF. The independent variables' effect, contact time, adsorbent dosage, and pH were predicted using Response Surface Methodology (RSM) for chromium adsorption onto Watermelon Shell Activated Carbon (WSAC). The experimental results indicated that NaOH activation effectively improved WSAC's adsorption capacity. The maximum adsorption capacity was 54.53 %, with an adsorbent dosage of 0.6 g/l, pH of 6.0, and agitation time of 40 min. The high correlation coefficient (R 2 =0.978) between the model and the experimental data showed that the model predicted the removal of Cr 2+ from textile effluent using Watermelon Shell Activated Carbon efficiently.
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