Fig. 4From: Bio-sorption for effective removal of chromium(VI) from wastewater using Moringa stenopetala seed powder (MSSP) and banana peel powder (BPP)Effect of contact time on % removal of: A/Cr(VI) by MSSP and B/Cr(VI) by BPP (concentration 30 mg/L, contact time 60, 90, 120 and 150 min, adsorbent dose 5, 10, 15 and 20 g/L solution, agitation speed 150 rpm and pH = 2 for MSSP, pH = 4 for BPP)Back to article page