Photo and Chemical Reduction of Copper onto Anatase-Type TiO2 Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts

Hamed Eskandarloo; Alireza Badiei; Mohammad A Behnajady; Ghodsi Mohammadi Ziarani

doi:10.1111/php.12455

Photo and Chemical Reduction of Copper onto Anatase-Type TiO2 Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts

Photochem Photobiol. 2015 Jul-Aug;91(4):797-806. doi: 10.1111/php.12455. Epub 2015 Apr 8.

Authors

Hamed Eskandarloo¹, Alireza Badiei¹, Mohammad A Behnajady², Ghodsi Mohammadi Ziarani³

Affiliations

¹ School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
² Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
³ Department of Chemistry, Faculty of Science, Alzahra University, Tehran, Iran.

PMID: 25809844
DOI: 10.1111/php.12455

Abstract

In this study, the photocatalytic efficiency of anatase-type TiO2 nanoparticles synthesized using the sol-gel low-temperature method, were enhanced by a combined process of copper reduction and surface hydroxyl groups enhancement. UV-light-assisted photo and NaBH4 -assisted chemical reduction methods were used for deposition of copper onto TiO2. The surface hydroxyl groups of TiO2 were enhanced with the assistance of NaOH modification. The prepared catalysts were immobilized on glass plates and used as the fixed-bed systems for the removal of phenazopyridine as a model drug contaminant under visible light irradiation. NaOH-modified Cu/TiO2 nanoparticles demonstrated higher photocatalytic efficiency than that of pure TiO2 due to the extending of the charge carriers lifetime and enhancement of the adsorption capacity of TiO2 toward phenazopyridine. The relationship of structure and performance of prepared nanoparticles has been established by using various techniques, such as XRD, XPS, TEM, EDX, XRF, TGA, DRS and PL. The effects of preparation variables, including copper content, reducing agents rate (NaBH4 concentration and UV light intensity) and NaOH concentration were investigated on the photocatalytic efficiency of NaOH-modified Cu/TiO2 nanoparticles.