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Desorption studies for methylene blue dye removal by Kaolinite
Puteri Balqis Awatif Abdul Ghani1, Ruhaida Rusmin2, Izzan Salwana Izman3.
ABSTRACT
In wastewater treatment, the reusability of an adsorbent strongly relies on
the feasibility of contaminant desorption from the spent adsorbent. This
research aims to investigate the Methylene Blue (MB) release from the spent
kaolinite clay mineral against a variety of desorbing eluent in an aqueous
solution. Malaysia’s kaolinite was characterised using Scanning Electron
Microscopy (SEM), surface area analysis, and Fourier Transform Infrared
(FTIR) Spectroscopy. The MB desorption was performed using eluents of
distilled water, solutions of HCl, NaOH, and NaCl (0.01 M and 0.1 M),
and ethanol: water mixtures (30:70, 50:50, and 70:30 v/v ratios). It was
found that the MB desorption only occurs in 0.1 M NaOH (pH 12.7). A
4.2% MB desorption was recorded in 1 hour and was increased to 19.5%
within 24 hours desorption time. The pH change measurement also reveals
the favorability for highly alkaline conditions for MB desorption. The
overall finding indicates that the MB retention towards kaolinite is strong,
and its adsorption occurs via electrostatic and hydrophobic interaction, as
suggested by the FTIR analysis. Kaolinite is a good scavengerforremoving
the MB dye from contaminated water but requires a strong eluent in the
desorption process for its future reusability process.
Affiliation:
- Universiti Teknologi MARA, Negeri Sembilan, Malaysia
- Universiti Teknologi MARA, Negeri Sembilan, Malaysia
- Universiti Teknologi MARA, Negeri Sembilan, Malaysia
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