Malaysian Journal of Analytical Sciences Vol 24 No 6 (2020): 1045 - 1060

 

 

 

 

ROLE OF VANADIA AND TITANIA PHASES IN THE REMOVAL OF METHYLENE BLUE BY ADSORPTION AND PHOTOCATALYTIC DEGRADATION

 

(Peranan Fasa Vanadia dan Titania dalam Penyingkiran Metilena Biru Melalui Penjerapan dan Degradasi Fotokatalisis)

 

Pei Wen Koh^1,2, Cheng Yee Leong², Leny Yuliati^2,3, Hadi Nur², Siew Ling Lee²*

 

¹Department of Chemistry, Faculty of Science

²Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research

Universiti Teknologi Malaysia, 81300 Johor Bahru, Malaysia

³Ma Chung Center for Photosynthetic Pigments,

Universitas Ma Chung, Malang 65151, Indonesia

 

*Corresponding author:  sllee@ibnusina.utm.my

 

 

Received: 18 July 2019; Accepted: 20 July 2020; Published:  10 December 2020

 

 

Abstract

Total removal of methylene blue (MB) over vanadia (V₂O₅) -modified titania (TiO₂) composite demonstrated that the V₂O₅ and TiO₂ phases played a vital role in the adsorption and photodegradation of MB, respectively. The 10 mol% of V₂O₅- modified TiO₂ (10V-TiO₂) showed the highest removal of MB, i.e., 26- and 2-folds better adsorption capacity than that of undoped TiO₂ and V₂O₅, respectively. The presence of surface hydroxyl, pores, and the highest amount of V⁵⁺ species in 10V-TiO₂ could be responsible for the high adsorption of MB. V₂O₅ induced anatase to rutile phase transformation and shifted absorption properties of TiO₂ to the visible light region. Considering the rutile phase has lower bandgap energy (3.0 eV), its presence in the sample has enhanced the photodegradation of MB. The photodegradation of MB followed pseudo-second-order reaction. The reusability test elucidated that the photodegradation performance of 10V-TiO₂ was improved by 30-folds after the second cycle, with total MB removal due to the exposure of more TiO₂ to MB.

 

Keywords:  vanadia, titania, methylene blue, adsorption, photocatalyst, photodegradation

 

Abstrak

Penyingkiran metilena biru (MB) secara keseluruhan oleh komposit titania (TiO₂) yang diubahsuai dengan vanadia (V₂O₅) menunjukkan bahawa fasa V₂O₅ dan TiO₂ masing-masing memainkan peranan penting dalam penjerapan dan fotodegradasi MB. TiO₂ yang diubahsuai dengan 10 mol% V₂O₅ (10V-TiO₂) menunjukkan penyingkiran MB yang tertinggi, iaitu 26- dan 2-kali ganda kapasiti penjerapan yang lebih baik daripada TiO₂ dan V₂O₅ yang tidak didopkan. Kewujudan hidrosil di permukaan, liang, dan jumlah spesis V⁵⁺ tertinggi dalam 10V-TiO₂ menyumbang kepada penjerapan MB yang tinggi. V₂O₅ mendorong transformasi fasa anatase ke rutil dan sifat-sifat penyerapan TiO₂ beralih ke rantau cahaya nampak. Memandangkan fasa rutil mempunyai tenaga jurang jalur yang lebih rendah (3.0 eV), kewujudannya dalam sampel telah meningkatkan prestasi fotodegradasi MB. Fotodegradasi MB mengikuti tindak balas tertib pseudo-kedua. Ujian kebolehgunaan tersebut membuktikan bahawa prestasi fotodegradasi 10V-TiO₂ telah ditingkatkan sebanyak 30-kali ganda selepas kitaran kedua kerana lebih banyak TiO₂ terdedah kepada MB.

 

Kata kunci:  vanadia, titania, metilena biru, penjerapan, fotokatalis, fotodegradasi

 

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