Photocatalytic and antibacterial activity of B/N/Ag co-doped CNT–TiO2 composite films

• Published in: Journal of inclusion phenomena and macrocyclic chemistry Vol. 82; no. 1-2; pp. 229 - 234
• Main Authors: Uddin, Md. Nizam, Islam, Md. Saidul, Mazumder, Md. Motiur Rahaman, Hossain, Md. Asjad, Elias, Md, Siddiquey, Iqbal Ahmed, Susan, Md. Abu Bin Hasan, Saha, Dilip Kumar, Rahman, Mohammed M., Asiri, Abdullah M., Hayami, Shinya
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-06-2015
• Subjects: Chemistry; Chemistry and Materials Science; Crystallography and Scattering Methods; Food Science; Organic Chemistry; Original Article; Antibacterial study; Photo-catalyst; Co-doped TiO
• ISSN: 1388-3127; 1573-1111
• DOI: 10.1007/s10847-015-0510-2

Thin films of TiO
2
and B/N/Ag co-doped carbon nanotube (CNT)–TiO
2
(Ag/B/N–CNT–TiO
2
) composite on top of glass substrates have been successfully prepared by a simple sol–gel drop coating route. The films were characterized by X-ray diffraction (XRD) and UV–Vis spectroscopy. XRD patterns of TiO
2
, CNT–TiO
2
and co-doped TiO
2
composite films were shown single phase of anatase. The UV–Vis absorption spectra showed absorption edge shifted to visible light region after doping Ag/B/N in TiO
2
. The photocatalytic properties of Ag/B/N–CNT–TiO
2
thin films were evaluated by degradation of methylene blue under visible light irradiation. It has been found that photocatalytic efficiency was significantly improved when TiO
2
is subjected to modify by using Ag, B, N and CNT. The highest photocatalytic activity has been shown by 2 %B/5 %N–CNT–TiO
2
with 58 % efficiency whereas the efficiency was only 17 % for pure TiO
2
film. The experimental photodegradation data were well fitted by zero-order, first-order and modified Freundlich kinetic models. The antimicrobial activities of the prepared composite thin films have also been tested using bacteria
Escherichia coli
(
E. coli
). The composite Ag–TiO
2
and 2 %B/5 %N/2 %Ag–CNT–TiO
2
showed higher antimicrobial activity than B/N–CNT–TiO
2
. All of the thin films have been used in many times for the degradation measurement and antibacterial studies.