Sains Malaysiana 42(6)(2013):
819–826
Methylene
Blue Adsorption on Graphene Oxide
(Penjerapan Metilena Biru ke Atas Grafin Oksida)
Chin Hua Chia*, Nur Fazlinda Razali, Mohd
Shaiful Sajab, Sarani Zakaria
School of Applied Physics, Faculty of Science
and Technology, Universiti Kebangsaan Malaysia
43600 Bangi, Selangor, Malaysia
Nay Ming Huang
Low Dimensional Materials Research Centre, Physics
Department, University of Malaya
50603 Kuala Lumpur, Malaysia
Hong Ngee Lim
Department of Chemistry, Faculty of Science, Universiti Putra
Malaysia
43400 UPM Serdang, Selangor, Malaysia
Diserahkan: 13 Jun 2012/Diterima: 13 September 2012
ABSTRACT
In this study, graphene oxide (GO), produced using the
simple Hummer’s method, was used as adsorbent to remove methylene blue (MB)
from aqueous solution. Characterizations using transmission electron microscope
(TEM)
and Fourier transform infrared (FTIR) spectroscopy were carried out on the GO before
the MB adsorption experiments. The adsorption kinetics and isotherm
studies were conducted under different conditions (pH = 3-7 and MB concentration =
100-400 mg/L) to examine the adsorption efficiency of the GO towards MB in
aqueous solution. The adsorption kinetics data were analyzed using different
kinetic models to investigate the adsorption behavior of MB on GO. The obtained results
showed that the maximum adsorption capacity of the GO towards MB can
achieve up to ~700 mg/g for the adsorption at 300 mg/L MB. The adsorption
kinetic data were found to fit pseudo-second order model as compared with
pseudo-first-order model. The intraparticle diffusion model suggested that the
adsorption process of GO towards MB was dominated by the
external mass transfer of MB molecules to the surface of GO.
Keywords: Adsorption isotherm; adsorption kinetics; intraparticle
diffusion; methylene blue
ABSTRAK
Dalam penyelidikan ini, grafin oksida (GO) yang disediakan
melalui kaedah Hummer telah digunakan sebagai bahan penjerap untuk
menyingkirkan metilena biru (MB) daripada larutan akues. Pencirian
menggunakan mikroskop elektron transmisi (TEM) dan spektroskopi
inframerah transmisi Fourier (FTIR) telah dilakukan ke atas GO sebelum eksperimen
penjerapan MB.
Data kinetik penjerapan telah dianalisis dengan menggunakan model kinetik yang
berlainan untuk mengkaji sifat penjerapan MB ke atas GO.
Keputusan yang diperoleh menunjukkan bahawa kapasiti penjerapan maksimum GO terhadap MB mencapai
~700 mg/g daripada larutan MB berkepekatan 300 mg/L. Data kinetik
penjerapan didapati berpadanan dengan model pseudo-tertib kedua. Model resapan
intrazarah mencadangkan bahawa proses penjerapan MB ke atas GO adalah
didominasi oleh pemindahan jisim luaran molekul MB ke permukaan GO.
Kata kunci: Isoterm penjerapan; kinetik
penjerapan; metilena biru; resapan intrazarah
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*Pengarang untuk surat-menyurat; email: chia@ukm.my
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