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Sains Malaysiana 46(6)(2017):
953–965
http://dx.doi.org/10.17576/jsm-2017-4606-15
Sifat Kinetik dan Isoterma Penjerapan Formaldehid ke atas Komposit Serbuk Serat Kelapa Sawit-TiO2 (Kinetic and Isotherm
Properties of Formaldehyde Adsorption on Oil Palm Fibre-TiO2 Composite Powder)
NOR RAHAFZA ABDUL MANAP1, ROSLINDA SHAMSUDIN1*, MOHD NORHAFSAM MAGHPOR2, MUHAMMAD AZMI ABDUL HAMID1 & AZMAN JALAR1
1Pusat Pengajian Fizik Gunaan, Fakulti Sains & Teknologi, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan,
Malaysia
2Bahagian
Pembangunan Penyelidikan dan Konsultansi, Institut Kesihatan dan Keselamatan Pekerjaan Nasional (NIOSH),
Lot 1, Jalan 15/1, Seksyen 15, 43650 Bandar Baru Bangi,
Selangor Darul Ehsan, Malaysia
Received:
24 May 2016/Accepted: 20 December 2016
ABSTRAK
Sifat isoterma dan kinetik penjerapan formaldehid ke atas komposit serbuk serat kelapa sawit-TiO2 yang melibatkan sistem gas-pepejal adalah dikaji. Komposit serbuk serat kelapa sawit-TiO2 dihasilkan dengan mencampurkan serbuk kelapa sawit dan serbuk TiO2 dengan nisbah 8:2 menggunakan teknik pengisaran mekanik. Pengujian dijalankan di dalam kebuk ujian dengan komposit serbuk kelapa sawit-TiO2 dibiarkan untuk menjerap dan mengurangkan nilai kepekatan formaldehid secara pasif. Didapati nilai penjerapan maksima dan sifat kinetik penjerapan bergantung kepada kepekatan awal formaldehid. Kepekatan awal, Ci, 2.1 ppm dan 0.5 ppm masing-masing diwakili oleh pseudo-tertib pertama dan pseudo tertib kedua, manakala Ci = 0.75 dan 0.9 ppm diwakili oleh model Elovich. Isoterma penjerapan formaldehid diwakili oleh isoterma Freundlich dengan nilai korelasi tertinggi R2 =
0.9397 berbanding nilai korelasi isoterma Langmuir (R2 =
0.8692) dan isoterma Temkin (R2 = 0.8756). Parameter keseimbangan, 0<RL<1 bagi setiap kepekatan pemula menunjukkan penjerapan formaldehid ke atas serbuk komposit serat kelapa sawit-TiO2 cenderung untuk berlaku.
Kata kunci: Isoterma; kinetik; komposit; penjerapan; serat kelapa sawit
ABSTRACT
Isotherm and kinetic
properties of formaldehyde adsorption on oil palm fibre-TiO2
composite powder; a gas-solid system was studied.
Oil palm fibre-TiO2
composite powder was prepared by mixing oil palm
fibre with TiO2
powder with ratio of 4:1 using a mechanical milling
technique. The test was done in a test chamber where oil palm
fibre-TiO2 composite
powder was left to passively adsorb the formaldehyde. The maximum
adsorption capacity value and kinetic properties depends on initial
concentration of formaldehyde. Formaldehyde initial concentration
of 2.1 and 0.5 ppm was best presented by pseudo-first order and
pseudo-second order, respectively, while for initial concentration
of 0.75 and 0.9 ppm, both were well presented by Elovich model. The adsorption isotherm of formaldehyde was
best described by Freundlich isotherm
which showed the highest correlation coefficient, R2 =
0.9397 compared to Langmuirs' (R2
= 0.8692) and Temkins'
(R2
= 0.8756) correlation coefficients. Equilibrium
parameter of 0<RL<1
which showed the formaldehyde adsorption onto oil palm fibre-TiO2
composite was favorable to happen.
Keywords: Adsorption;
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*Corresponding author; email: linda@ukm.edu.my
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