Evaluation of the Adsorption of Cr(VI) by Modified Bamboo Shells

Abstract:

The adsorption of Cr(VI) by modified Bamboo shell has been investigated using chemical methods and IR spectrometry. The optimal condition for the adsorption of Cr(VI) by modified Bamboo shell is at 298 K and pH = 1.0, which gives a static saturated adsorption capacity of 12.68 mg·g-1, an apparent adsorption rate constant of k298 = 9.56 × 10-4 s-1, and an apparent adsorption activation energy of 7.38 kJ·mol-1. The adsorption follows the Langmuir and Freundlich isotherms and the liquid film diffusion is the controlling process of the adsorption. The adsorption thermodynamic parameters are ΔH = 66.04 kJ·mol-1, ΔS = 0.2974 kJ·mol-1·K-1, ΔG = −22.58~−28.52 kJ·mol-1. The anions HPO42-, H2PO4- and SO42- have negligible influence on the adsorption capacity. Small amount of desorption is observed only at pH > 11. The adsorption of Cr(VI) by modified bamboo shell is mainly a chemical process.

• Periodical: Applied Mechanics and Materials (Volumes 361-363)
• Pages: 709-715
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.361-363.709
• Online since: August 2013
• Authors: Xin Long Jiang, Yi Hua Jiang
• Keywords: Adsorption Behavior, Bamboo Shells, Cr(VI), Modification

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