Sains Malaysiana 44(7)(2015): 1011–1019

 

Evaluation on the Photocatalytic Degradation Activity of Reactive Blue 4 using Pure Anatase Nano-TiO2

(Penilaian pada Aktiviti Degradasi Fotopemangkinan daripada Reaktif Blue 4 menggunakan

Anatase Nano-TiO2 Tulen)

 

 

EMY MARLINA SAMSUDIN1, SZE NEE GOH2, TA YEONG WU2, TAN TONG LING1,

SHARIFAH BEE ABD. HAMID1 & JOON CHING JUAN2*

 

1Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya

50603 Kuala Lumpur, Malaysia

 

2Laboratory of Applied Catalysis and Environmental Technology, School of Science,

Monash University Malaysia Campus, 46150 Bandar Sunway, Selangor Darul Ehsan

Malaysia

 

Diserahkan: 24 November 2014/Diterima: 3 Mac 2015

 

ABSTRACT

Disposal of dye wastewater into water streams without treatment endangers human and marine lives. This work focused on the second largest class of textile dyes after azo dyes due to its high resistivity to biodegradation and high toxicity. The photocatalytic degradation of Reactive Blue 4 (RB4), an anthraquinone dye, has been investigated using pure anatase nano titanium (IV) oxide (TiO2). The dye molecules were fully degraded and the addition of hydrogen peroxide (H2O2) enhanced the photodegradation efficiency. It is found that the degradation as the hydroxyl radicals in the bulk solution is sufficient for complete mineralisation. The disappearance of the dye follows pseudo-first-order kinetics. The effect of pH, amount of photocatalyst, UV-light intensity, light source and concentration of hydrogen peroxide was ascertained.

 

Keywords: Anthraquinone dye; hydrogen peroxide; photocatalysis; textile wastewater; TiO2

 

ABSTRAK

Pembuangan air sisa pewarna ke dalam air sungai tanpa rawatan membahayakan kehidupan manusia dan marin. Penyelidikan ini memberi tumpuan kepada pewarna tekstil kelas kedua terbesar selepas pewarna azo kerana kerintangan yang tinggi untuk biodegradasi dan ketoksikan yang tinggi. Degradasi fotopemangkinan daripada Reaktif Blue 4 (RB4), satu pewarna antrakuinon, telah dikaji menggunakan anatase nano-TiO2 tulen. Molekul pewarna diuraikan sepenuhnya dan penambahan hidrogen peroksida (H2O2) meningkatkan kecekapan fotopemerosotan. Didapati bahawa degradasi sebagai radikal hidroksil dalam penyelesaian pukal adalah mencukupi untuk mineral lengkap. Kehilangan pewarna adalah mengikut kinetik tertib pertama pseudo. Kesan pH, jumlah fotomangkin, keamatan cahaya UV, sumber cahaya dan kepekatan hidrogen peroksida telah ditentukan dalam kajian ini.

 

Kata kunci: Foto pemangkinan; hidrogen peroksida; pewarna antrakuinon; sisa air kumbahan tekstil; TiO2

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*Pengarang untuk surat-menyurat; email: jcjuan@um.edu.my

 

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