Watermelon Shell, an agricultural waste, was employed for the adsorptive removal of chromium (II) ion Cr 2+ from textile effluent. This study analysed adsorbent's active sites and morphological structures using FT-IR, SEM, XRD, XRF. The independent variables' effect, contact time, adsorbent dosage, pH were predicted Response Surface Methodology (RSM) adsorption onto Shell Activated Carbon (WSAC...