continuous flow studies on the sorption of Congo Red using
ethylenediamine modified rice hulls
Siew-Teng Ong1*, Eng Hooi Tay2,
Sie-Tiong Ha1, Weng-Nam Lee2 and Pei-Sin
of Chemical Science, Faculty of Science, Engineering and
Technology, Universiti Tunku Abdul Rahman,
Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia.
of Science, Faculty of Engineering and Science, Universiti
Tunku Abdul Rahman,
Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia.
of Pharmaceutical Chemistry, International Medical
University, No.126, Jalan 19/155B, Bukit Jalil, 57000 Kuala
*Corresponding author. E-mail:
23 September, 2009.
effectiveness of using ethylenediamine rice hulls (EDA-RH)
to remove Congo Red (CR) from synthetic dye solution was
carried out in batch and column experiments under various
experimental conditions. Surface morphology analysis was
carried out also using atomic force microscopy (AFM). The
experimental data obtained at different initial dye
concentrations fitted well to pseudo-second order kinetic
model. Application of Langmuir isotherm indicated that
maximum sorption capacity of EDA-RH for CR was enhanced by
2-fold as compared to natural rice hulls. Column studies
revealed that the breakthrough curves of CR followed the
typical S shape of packed-bed systems and it was bed-depth
and influent-concentration dependent. The BDST model was
used to predict the bed-depth service time data at different
bed depths. A plot of BDST at 50% breakthrough yielded a
straight line that, however, does not pass through the
Sorption, ethylenediamine rice hulls, Congo Red, batch
study, column study.