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Removal of Cr(VI) by biosorption on two agro waste materials, casuarinas fruit powder (CFP) and sorghum stem powder (SSP), has been investigated. The prepared adsorbent materials were characterized by SEM, EDX, FTIR and BET. These biomaterials effectively removed Cr(VI) with a maximum removal of 93.35% and 63.75% using 15 gL−1 and 5 gL−1 of CFP and SSP, respectively, at 60 °C with 20mgL−1 initial...