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Systematic variation of preparation time, temperature, and pressure in hydrothermal synthesis of macro-/mesoporous TiO2 for photocatalytic air treatment

Title:

Systematic variation of preparation time, temperature, and pressure in hydrothermal synthesis of macro-/mesoporous TiO2 for photocatalytic air treatment

Haghighat, Fariborz, Mamaghani, Alireza Haghighat and Lee, Chang-Seo (2019) Systematic variation of preparation time, temperature, and pressure in hydrothermal synthesis of macro-/mesoporous TiO2 for photocatalytic air treatment. Journal of Photochemistry and Photobiology A: Chemistry . ISSN 10106030 (In Press)

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Official URL: http://dx.doi.org/10.1016/j.jphotochem.2019.04.022

Abstract

A series of porous TiO2 photocatalysts are prepared, by systematically varying the preparation conditions (time, temperature, or pressure (i.e. filling ratio)), characterized, and evaluated in photocatalytic oxidation of toluene and methyl ethyl ketone (MEK) to explore preparation-property-performance relationships. A detailed characterization has been conducted via X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and UV-vis spectroscopy. Furthermore, hydroxyl radical (•OH) generation on the surface of TiO2 is measured by a photoluminescence (PL) method using terephthalic acid (TA) as probe molecule. All the hydrothermally-prepared samples possessed good crystallinity (79.5-89 %), large surface area (134.9-237.2 m2/g), small crystal size (5.9-10 nm), and mesoporous structure. SEM images revealed presence of macropores and marcochannels, and N2 adsorption-desorption and TEM analyses indicated a significant amount of mesopores. PL and XRD results demonstrated a good proportionality between surface area normalized •OH generation and crystallinity. The complex interplay among various properties (especially crystallinity and surface area) led to appearance of activity optimums. Photocatalyst prepared at 12 h, 200 °C, and 80% filling ratio exhibited the best toluene and MEK removal efficiencies, which surpass those of P25 by factors of 2.08 and 1.85 times, respectively. The superior photocatalytic activity of developed TiO2 catalysts might be attributed to high surface area and existence of meso-/macropores that provide a large number of active sites, and facilitate light penetration and pollutants diffusion. The presented property-activity relationships can be utilized as potential design criteria for the development of new TiO2 photocatalysts for air purification.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Article
Refereed:Yes
Authors:Haghighat, Fariborz and Mamaghani, Alireza Haghighat and Lee, Chang-Seo
Journal or Publication:Journal of Photochemistry and Photobiology A: Chemistry
Date:2019
Digital Object Identifier (DOI):10.1016/j.jphotochem.2019.04.022
Keywords:Photocatalytic oxidation (PCO); Titanium dioxide (TiO2); Hydrothermal; Hydroxyl radical; Photoluminescence; Air purification
ID Code:985326
Deposited By: ALINE SOREL
Deposited On:29 Apr 2019 16:18
Last Modified:29 Apr 2019 16:18

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