Alkaline-treated cocoa pod husk as adsorbent for removing methylene blue from aqueous solutions

Fei Ling Pua, Mohd Shaiful Sajab, Chin Hua Chia, Sarani Zakaria, Irman Abdul Rahman, Mohd Sapuan Salit

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32 Citations (Scopus)

Abstract

In this study, cocoa pod husk (CPH) was used as adsorbent for removing methylene blue (MB) from aqueous solutions. Before the adsorption studies, the CPH was treated using sodium hydroxide (NaOH) to increase its adsorption capacity toward methylene blue (MB). The NaOH-treated CPH was characterized by SEM and FTIR analyses. Lignin was removed after the NaOH treatment, leaving higher accessible surface for adsorption. The adsorption performances of the CPH were investigated in terms of adsorption kinetics and isotherms under different conditions, i.e., pH, initial MB concentration, and temperature. Freundlich isotherm fits the adsorption experiment data better than that of Langmuir and Sips isotherms, suggesting the heterogeneous adsorption behavior of MB on the CPH. The maximum adsorption capacity of the NaOH-treated CPH toward MB is 263.9 mg/g. Pseudo-second order gives the better correlation to predict the kinetic process. The adsorption of MB on the NaOH-treated CPH was found to be endothermic and spontaneous.

Original languageEnglish
Pages (from-to)460-465
Number of pages6
JournalJournal of Environmental Chemical Engineering
Volume1
Issue number3
DOIs
Publication statusPublished - 01 Sep 2013

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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