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

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27 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 - Sep 2013

Fingerprint

Cocoa
cocoa
Methylene Blue
Adsorbents
aqueous solution
adsorption
Adsorption
Isotherms
isotherm
kinetics
Sodium Hydroxide
Kinetics
Lignin
lignin
hydroxide
scanning electron microscopy
Sodium
sodium

Keywords

  • Adsorption isotherms
  • Cocoa pod husk
  • Kinetic model
  • Methylene blue
  • Natural adsorbents

ASJC Scopus subject areas

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

Cite this

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title = "Alkaline-treated cocoa pod husk as adsorbent for removing methylene blue from aqueous solutions",
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.",
keywords = "Adsorption isotherms, Cocoa pod husk, Kinetic model, Methylene blue, Natural adsorbents",
author = "Pua, {Fei Ling} and {Mohd Shaiful}, Sajab and Chia, {Chin Hua} and Sarani Zakaria and {Abdul Rahman}, Irman and Salit, {Mohd Sapuan}",
year = "2013",
month = "9",
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language = "English",
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T1 - Alkaline-treated cocoa pod husk as adsorbent for removing methylene blue from aqueous solutions

AU - Pua, Fei Ling

AU - Mohd Shaiful, Sajab

AU - Chia, Chin Hua

AU - Zakaria, Sarani

AU - Abdul Rahman, Irman

AU - Salit, Mohd Sapuan

PY - 2013/9

Y1 - 2013/9

N2 - 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.

AB - 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.

KW - Adsorption isotherms

KW - Cocoa pod husk

KW - Kinetic model

KW - Methylene blue

KW - Natural adsorbents

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