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Impacts of Amount of Impregnated Iron in Granular Activated Carbon on Arsenic Adsorption Capacities and Kinetics

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Iron impregnated granular activated carbons (Fe-GAC) with iron contents 1.64%–28.90% were synthesized through a new multi-step procedure developed in this research for investigation of the effects of iron amount on arsenic adsorption capacities and kinetics. Langmuir model was successfully used for fitting arsenic adsorption equilibrium data. The maximum adsorption capacity (qm ) increased significantly to a peak at 1,866.7–1,911.5 μg/g with iron contents of 11.49 – 15.03%. Further increase of iron contents caused gradual decrease of adsorption capacities. Iron content of Fe-GACs was found to affect arsenic adsorption rate. Pseudo-secondorder kinetic model can fit arsenic adsorption kinetics better than pseudo-first-order model. The adsorption rate constant increased with iron content increasing from 1.64% to 13.59% and then decreased with impregnated iron increase to 28.90%. The intraparticle diffusion rate increased initially with iron content up to 5.57% and then maintained at same level with iron content increased to 28.90%.
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Keywords: Arsenate; GAC; adsorption capacity; iron impregnation; kinetics

Document Type: Research Article

Publication date: 01 January 2010

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