OF EXPERIMENTAL DESIGN
(Penyingkiran
Malakit Hijau daripada Larutan Akues Menggunakan Karbon Tiub Nano: Aplikasi
Reka Bentuk Eksperimen)
Siti Aminah Zulkepli1, Md Pauzi Abdullah1,
2*, Wan Mohd Afiq Wan Mohd Khalik1
1School of Chemical Sciences and Food Technology
2Centre for Water Research and Analysis (ALIR)
Faculty of Science and Technology
Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
*Corresponding author: mpauzi@ukm.edu.my
Received:
11 January 2016; Accepted: 10 March 2016
Abstract
An experimental design methodology was performed
in the optimization of removal of malachite green dye by multi-walled carbon
nanotubes. A Central Composite Design (25) was chosen to develop a
mathematical model and determine the optimum condition for adsorption of
malachite green by carbon nanotubes. Five experimental factors, namely initial
dye concentration, mass of adsorbent, pH, contact time and agitation speed were
studied. Maximum adsorption of malachite green was achieved at the suggested
optimum conditions: initial dye concentration (20 ppm), weight of adsorbent
(0.03 g), pH solution (7) contact time (17 min) and agitation speed (150
strokes per min). The experimental value of adsorption by multi-walled carbon
nanotubes were found to be in good agreement with the predicted value (R2
= 0.922).The experimental equilibrium
data were best fitted to isotherm model (Langmuir) and kinetic model (pseudo
second-order) respectively. Maximum adsorption by carbon nanotubes at monolayer
for malachite green was obtained at 112.36 mg/g while kinetic rate constant was
calculated to be 0.0017 g mg-1 min-1.
Keywords: carbon nanotubes, adsorption, malachite
green, experimental design
Abstrak
Metodologi reka bentuk eksperimen telah dijalankan
dalam pengoptimuman penyingkiran pewarna malakit hijau oleh karbon tiub nano
multi-dinding. Reka bentuk komposit berpusat (25) telah dipilih
untuk membentuk satu model matematik dan menentukan kondisi yang optima untuk
penjerapan malakit hijau oleh karbon tiub nano. Lima faktor eksperimen yang
terdiri daripada kepekatan awal pewarna, berat bahan penjerap, pH larutan, masa
sentuhan dan kelajuan goncangan telah dikaji. Malakit hijau telah mencapai
penjerapan yang optima oleh karbon tiub nano pada kondisi: kepekatan awal
pewarna (20 ppm), berat bahan penjerap (0.03 g), pH larutan (7), masa sentuhan
(17 minit) dan kelajuan goncangan (150 strok/minit). Nilai eksperimen untuk
penjerapan oleh karbon tiub nano multi-dinding telah mencapai persetujuan yang
baik pada nilai jangkaan (R2 = 0.922). Data eksprimen keseimbangan menunjukkan
kesesuaian pada model Langmuir dan model pseudo tertib kedua. Penjerapan
maksimum oleh karbon tiub nano pada monolapisan untuk malakit hijau ialah
112.36 mg/g manakala pemalar kadar kinetik ialah 0.0017 g mg-1 min-1.
Kata kunci:
karbon tiub nano, penjerapan, malakit hijau, reka bentuk eksperimen
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