Removal of Malachite Green from aqueous solution using degreased coffee bean

Mi Hwa Baek, Christianah Olakitan Ijagbemi, Se Jin O, Dong Su Kim

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336 Scopus citations


This study reports on the feasibility of employing degreased coffee beans (DCB) as adsorbent for Malachite Green (MG) removal in dyeing wastewater. The iodine value (IV), specific surface area (SSA) and porosity of the raw coffee beans (RCB) used in the study increased after the degreasing process, resulting in significant increase in the adsorption of MG onto DCB. Employing a batch experimental set-up, optimum conditions for complete color removal and adsorption of MG by DCB was studied considering parameters such as effect of degreasing process, adsorbent dosage, initial dye concentration, reaction temperature and pH. Adsorbed amount of MG by DCB increased with increasing DCB dosage and initial MG concentration. The rate of the adsorption reaction followed the pseudo second-order kinetics with the sorption isotherm well fitted to the Freundlich and the Langmuir isotherm models. Thermodynamic studies revealed that the adsorption processes is spontaneous and endothermic in nature. DCB has potentials for application as adsorbent for the removal of MG from dyeing process wastewater.

Original languageEnglish
Pages (from-to)820-828
Number of pages9
JournalJournal of Hazardous Materials
Issue number1-3
StatePublished - 15 Apr 2010

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation (NRF) grant funded by the Korean government (MEST, No. 2009-0093-461).


  • Adsorption
  • Color removal
  • Degreased coffee beans
  • Malachite Green


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