Sains Malaysiana 46(6)(2017): 953–965

http://dx.doi.org/10.17576/jsm-2017-4606-15

 

Sifat Kinetik dan Isoterma Penjerapan Formaldehidke 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

 

Diserahkan: 24 Mei 2016/Diterima: 20 Disember 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; composite; isotherm; kinetic; oil palm fibre

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*Pengarang untuk surat-menyurat; email: linda@ukm.edu.my

 

 

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