Sains Malaysiana 46(3)(2017): 493–501

http://dx.doi.org/10.17576/jsm-2017-4603-18

 

Preparation and Characterization of Mg/TiO2 for Visible Light Photooxidative-Extractive Deep Desulfurization

(Penyediaan dan Pencirian Mg/TiO2 untuk Proses Nyahsulfur Fotopengoksidaan-Pengekstrakan di bawah Cahaya Nyata)

 

YEE CIA YIN1, CHONG FAI KAIT2*, HAYYIRATUL FATIMAH2, CECILIA WILFRED2,

MOHD FAISAL B TAHA2 & NORMAWATI BT MOHD YUNUS2

 

1Department of Chemical Engineering, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia

 

2Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS

32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia

 

Received: 21 January 2016/Accepted: 8 August 2016

 

ABSTRACT

A series of Mg/TiO2 photocatalysts were prepared using aqueous wet impregnation method at different Mg loading followed by calcination at different temperatures for 1 h duration. The photocatalysts were characterized using thermal gravimetry, Fourier-transform infrared spectroscopy, x-ray diffraction, field emission scanning electron microscopy and high-resolution transmission electron microscopy. The photocatalysts were investigated for photooxidative-extractive deep desulfurization of model oil containing dibenzothiophene at room temperature and under visible light irradiation. The model oil containing 100 ppm S was photooxidized followed by extraction using imidazolium-phosphate ionic liquids at room temperature. The best performing photocatalyst was 0.25 wt. % Mg/TiO2 calcined at 400°C (0.25Mg400), in which 98.4% of dibenzothiophene (3.070 mmol DBT per g photocatalyst) was converted to dibenzothiophene sulfone. The highest extraction efficiency of 97.8% (0.01525 mmol S per mL ionic liquid) was displayed by 1,2-diethylimidazolium diethylphosphate.

 

Keywords: Desulfurization; Mg/TiO2; oxidation; photocatalyst; visible light

 

 

ABSTRAK

Suatu siri Mg/TiO2 fotomangkin telah disediakan menggunakan kaedah impregnasi basah akuas dengan komposisi Mg yang berlainan diikuti dengan pengkalsinan selama 1 jam pada suhu yang berlainan. Pencirian fotomangkin tersebut dijalankan menggunakan termogravimetri, spektroskopi transformasi Fourier inframerah, pembelauan sinar-X, pemancaran medan mikroskopi imbasan elektron dan mikroskopi transmisi elektron beresolusi tinggi. Seterusnya, fotomangkin tersebut dikaji untuk proses nyahsulfur fotopengoksidaan-pengekstrakan daripada model minyak diesel yang mengandungi dibenzotiofen pada suhu bilik dan di bawah sinaran cahaya nyata. Model minyak mengandungi 100 ppm S yang difoto-oksidakan diikuti dengan proses pengekstrakan menggunakan bendalir ionik imidazolium fosfat pada suhu bilik. Fotomangkin 0.25 % bt. Mg/TiO2 yang dikalsin pada 400°C menunjukkan prestasi yang terbaik dengan 98.4% dibenzotiofen (3.070 mmol DBT per g fotomangkin) ditukar kepada dibenzotiofen sulfon. Tahap tertinggi pengekstrakan yang tercapai adalah 97.8% (0.01525 mmol S per mL bendalir ionik) yang ditunjukkan oleh 1,2-dietilimidazolium dietilfosfat.

 

Kata kunci: Cahaya nyata; fotomangkin; Mg/TiO2; nyahsulfur; pengoksidaan

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*Corresponding author; email: chongfaikait@utp.edu.my

 

 

 

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