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Title: Heterogeneous photocatalytic degradation of recalcitrant pollutants over CdS-TiO{sub 2} nanotubes: Boosting effect of TiO{sub 2} nanoparticles at nanotube-CdS interface

Abstract

The heterogeneous photocatalytic degradation of a textile dye, over TiO{sub 2} nanotubes (T_NT) containing nanocrystals of cadmium sulfide (CdS) and an interfacial layer of TiO{sub 2} nanoparticles (T_NP) is presented. T_NT is prepared by anodization of Ti mesh. A TiCl{sub 4} treatment is implemented to deposit T_NP on T_NT when applicable. CdS nanocrystals are prepared using a successive ionic layer adsorption and reaction approach. Methyl orange (MO) and phenol conversion on the different photocatalysts follows the trend: T_NT/T_NP/CdS > T_NT/CdS > T_NT with the actual values of fractional conversion of MO being 0.94, 0.64, and 0.04 respectively. The role of Na{sub 2}S in MO photodegradation and CdS stabilization is examined in detail. The addition of a limited amount of Na{sub 2}S (up to a concentration of 0.02 M) with MO has multiple benefits including (i) improvement in electron separation and transport, (ii) stabilization of the CdS, and (iii) enhancement of the photocatalytic degradation of MO by 35%.

Authors:
; ;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1129911
Report Number(s):
A-NETL-PUB-021
Resource Type:
Journal Article
Journal Name:
APPLIED CATALYSIS A-GENERAL
Additional Journal Information:
Journal Volume: 441
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; TiO{sub 2}-nanotubes; Anodization; CdS nanocrystals; SILAR; Photocatalysis; Methyl orange; Phenol; Mott–Schottky; Kinetics

Citation Formats

Wilson, Winn, Manivannan, A, and Subramanian, Vaidyanathan Ravi. Heterogeneous photocatalytic degradation of recalcitrant pollutants over CdS-TiO{sub 2} nanotubes: Boosting effect of TiO{sub 2} nanoparticles at nanotube-CdS interface. United States: N. p., 2012. Web. doi:10.1016/j.apcata.2012.06.013.
Wilson, Winn, Manivannan, A, & Subramanian, Vaidyanathan Ravi. Heterogeneous photocatalytic degradation of recalcitrant pollutants over CdS-TiO{sub 2} nanotubes: Boosting effect of TiO{sub 2} nanoparticles at nanotube-CdS interface. United States. doi:10.1016/j.apcata.2012.06.013.
Wilson, Winn, Manivannan, A, and Subramanian, Vaidyanathan Ravi. Sun . "Heterogeneous photocatalytic degradation of recalcitrant pollutants over CdS-TiO{sub 2} nanotubes: Boosting effect of TiO{sub 2} nanoparticles at nanotube-CdS interface". United States. doi:10.1016/j.apcata.2012.06.013.
@article{osti_1129911,
title = {Heterogeneous photocatalytic degradation of recalcitrant pollutants over CdS-TiO{sub 2} nanotubes: Boosting effect of TiO{sub 2} nanoparticles at nanotube-CdS interface},
author = {Wilson, Winn and Manivannan, A and Subramanian, Vaidyanathan Ravi},
abstractNote = {The heterogeneous photocatalytic degradation of a textile dye, over TiO{sub 2} nanotubes (T_NT) containing nanocrystals of cadmium sulfide (CdS) and an interfacial layer of TiO{sub 2} nanoparticles (T_NP) is presented. T_NT is prepared by anodization of Ti mesh. A TiCl{sub 4} treatment is implemented to deposit T_NP on T_NT when applicable. CdS nanocrystals are prepared using a successive ionic layer adsorption and reaction approach. Methyl orange (MO) and phenol conversion on the different photocatalysts follows the trend: T_NT/T_NP/CdS > T_NT/CdS > T_NT with the actual values of fractional conversion of MO being 0.94, 0.64, and 0.04 respectively. The role of Na{sub 2}S in MO photodegradation and CdS stabilization is examined in detail. The addition of a limited amount of Na{sub 2}S (up to a concentration of 0.02 M) with MO has multiple benefits including (i) improvement in electron separation and transport, (ii) stabilization of the CdS, and (iii) enhancement of the photocatalytic degradation of MO by 35%.},
doi = {10.1016/j.apcata.2012.06.013},
journal = {APPLIED CATALYSIS A-GENERAL},
number = ,
volume = 441,
place = {United States},
year = {2012},
month = {10}
}