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Zhou, X., Xue, X., & Xue, X. (2011). Study on adsorption of heavy metal ion in metallurgical wastewater by sepiolite. Proceedings of the 2nd International Conference on Environmental Science and Development, Singapore, 100-103.

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• TITLE: Thermodynamics and Adsorption Efficiencies of Maize Cob and Sawdust for the Remediation of Toxic Metals from Wastewater

  AUTHORS: Muhammad B. Ibrahim

  KEYWORDS: Adsorbate; Adsorbent; Maize Cob; % Removal; Sawdust; Wastewater

  JOURNAL NAME: Journal of Geoscience and Environment Protection, Vol.1 No.2, November 7, 2013

  ABSTRACT: The thermodynamics and sorption efficiencies for the remediation of Cr, Ni and Cd from their aqueous solutions using Maize Cob (MC) and Sawdust (SD) in a batch system are reported. Efficiencies were judged based on parameters such as sorbent weight, initial adsorbate loading concentration, pH and surface area. Shimadzu AA650 Double Beam Atomic Absorption/Flame spectrophotometer was employed to study concentration differences before and after the adsorption process. Parameters such as ΔH, ΔS and ΔG were determined. On MC, ΔH varied as 1466.59, 1271.21 and 1347.70kJmol-1 for Cr, Ni and Cd respectively. While on SD it varied as -566.85, 256.32 and 888.77kJmol-1respectively for the same order of metal ions. The three ions were found to be chemisorbed onto MC, while on SD Cr and Ni were physisorbed and Cd remains chemisorbed as suggested by Freundlich isotherm.