Malaysian Journal of Analytical Sciences Vol 21 No 1 (2017): 173 - 181

DOI: http://dx.doi.org/10.17576/mjas-2017-2101-20

 

 

 

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO₂ COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

 

(Kesan Pengkalsinan Suhu ke atas Komposit ZnO/TiO₂ untuk Menyingkirkan Fenol Melalui Fotopemangkin di bawah Cahaya Nampak)

 

Nur Syazrin Amalina Abdullah*, Sufian So’aib, Jaganatthan Krishnan

 

Faculty of Chemical Engineering,

Universiti Teknologi Mara, 40450 Shah Alam, Selangor, Malaysia

 

*Corresponding author: syaz_pingu@yahoo.com

 

 

Received: 21 October 2015; Accepted: 14 June 2016

 

 

Abstract

Composite catalyst ZnO/TiO₂ of molar ratio 0.75% was synthesized via sol gel method. The effect of preparation method on the crystal morphology was investigated. The catalyst particles were calcinated at 500 ^oC,550 ^oC and 600 °C for 3 hours. The XRD results revealed that calcination temperature controls the crystalline phase in terms of homogeneity and surface area of catalyst produced. The particle size was found to increase with calcination temperature suggesting the effect of different calcination temperatures on catalytic  activity  for  complete degradation of phenol. The result found that ZnO/TiO₂ catalyst calcinated at 600 ^oC resulted in 70% phenol degradation within five hours of irradiation time under visible light. The kinetic behavior of phenol degradation was found to fit with pseudo first order Langmuir-Hinshelwood kinetic model.

 

Keywords:  sol gel, ZnO/TiO₂ catalyst, photocatalytic degradation, visible light, kinetic

 

Abstrak

Pemangkin komposit ZnO/TiO₂ dengan 0.75% nisbah molar telah di sintesis melalui kaedah sol gel. Kesan kaedah penyediaan pada morfologi kristal itu telah di selidiki. Zarah-zarah pemangkin telah dikalsinkan pada suhu 500 ^oC, 550 ^oC dan 600 ^oC selama 3 jam. Keputusan XRD menunjukkan suhu pengkalsinan mengawal fasa kristal dari segi kesamaan dan kawasan permukaan pemangkin dihasilkan. Saiz zarah didapati meningkat sejajar dengan peningkatan suhu pengkalsinan mencadangkan kesan suhu pengkalsinan yang berbeza pada aktiviti pemangkin untuk penyingkiran penuh fenol. Keputusan mendapati pemangkin ZnO/TiO₂ yang dikalsinkan pada 600 ^oC boleh menyebabkan 70% fenol terdegradasi bagi tempoh lima jam masa penyinaran di bawah cahaya nampak. Kelakuan kinetik degradasi fenol didapati sesuai dengan pseudo peringkat pertama model kinetik Langmuir - Hinshelwood.

 

Kata kunci:  sol gel, mangkin ZnO/TiO₂, degradasi fotomangkin, cahaya nampak, kinetik

 

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