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Materials (Basel). 2018 Oct 23;11(11). pii: E2066. doi: 10.3390/ma11112066.

Impact of TiO₂ Nanotubes' Morphology on the Photocatalytic Degradation of Simazine Pollutant.

Author information

1
Nanotechnology and Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia. hanani_ms@yahoo.com.my.
2
Department of Physics and Chemistry, Faculty of Applied Sciences and Technology, Pagoh Higher Education Hub, KM1 Jalan Panchor, Johor Bahru 86400, Malaysia. hanani_ms@yahoo.com.my.
3
Nanotechnology and Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia. cwlai@um.edu.my.
4
Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia. hairul@um.edu.my.
5
Nanotechnology and Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia. emymarlinasamsudin@gmail.com.
6
Nanotechnology and Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia. mrafiej@um.edu.my.

Abstract

There are various approaches to enhancing the catalytic properties of TiO₂, including modifying its morphology by altering the surface reactivity and surface area of the catalyst. In this study, the primary aim is to enhance the photocatalytic activity by changing the TiO₂ nanotubes' architecture. The highly ordered infrastructure is favorable for a better charge carrier transfer. It is well known that anodization affects TiO₂ nanotubes' structure by increasing the anodization duration which in turn influence the photocatalytic activity. The characterizations were conducted by FE-SEM (fiend emission scanning electron microscopy), XRD (X-ray diffraction), RAMAN (Raman spectroscopy), EDX (Energy dispersive X-ray spectroscopy), UV-Vis (Ultraviolet visible spectroscopy) and LCMS/MS/MS (liquid chromatography mass spectroscopy). We found that the morphological structure is affected by the anodization duration according to FE-SEM. The photocatalytic degradation shows a photodegradation rate of k = 0.0104 min-1. It is also found that a mineralization of Simazine by our prepared TiO₂ nanotubes leads to the formation of cyanuric acid. We propose three Simazine photodegradation pathways with several intermediates identified.

KEYWORDS:

Simazine; TiO2 nanotubes; anodization; photocatalyst; photocatalytic; photodegradation mechanism

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