Improving photocatalytic oxidation of semiconductor (TiO2, SnO2, ZnO)/CNTs for NOx removal

[Display omitted] •Semiconductor/CNTs were mixed by ball milling route.•Photocatalytic ability of ZnO/CNTs was easily inactivated.•TiO2/CNTs has a strong NO photocatalytic oxidation to green products.•Holes are a primary factor for photocatalytic NO degradation. Traditional semiconductors, i.e., SnO...

Full description

Saved in:
Bibliographic Details
Published inJournal of industrial and engineering chemistry (Seoul, Korea) Vol. 127; pp. 321 - 330
Main Authors Nguyen, Hoang Phuong, Cao, Thi Minh, Nguyen, Tien-Thanh, Pham, Viet Van
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.11.2023
한국공업화학회
Subjects
Ball milling
NO oxidation
SnO2/CNTs
TiO2/CNTs
Visible photocatalysis
ZnO/CNTs
화학공학
Ball milling
Visible photocatalysis
NO oxidation
ZnO/CNTs
TiO2/CNTs
SnO2/CNTs
Online AccessGet full text

Cover

More Information
Summary:[Display omitted] •Semiconductor/CNTs were mixed by ball milling route.•Photocatalytic ability of ZnO/CNTs was easily inactivated.•TiO2/CNTs has a strong NO photocatalytic oxidation to green products.•Holes are a primary factor for photocatalytic NO degradation. Traditional semiconductors, i.e., SnO2, ZnO, and TiO2 have a good photocatalytic activity but still many disadvantages to applying in industry. In this study, these semiconductors are combined by commercial CNTs to form heterojunctions by a ball-milling route. The physical–chemical analyses include X-ray diffraction pattern (XRD), diffused reflectance spectra (UV–Vis DRS), Fourier transform infrared spectrum (FTIR), Mott-Schottky analysis, high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) are run to characterize the as-prepared materials. The total photocatalytic NOx efficiency of SnO2/CNTs, ZnO/CNTs, and TiO2/CNTs composites generate green products, i.e., NO3–, HNO3, etc. with 10%, 10.1%, and 41.25% after 30 min under visible light illumination, respectively. We also found that ZnO/CNTs easily inactivated the photocatalytic ability and converted NO gas to a more toxic product. Meanwhile, the highest selectivity of green products conversion belongs to SnO2/CNTs nanocomposite. Our findings will design and select an excellent photocatalytic oxidation system for NOx removal towards a flue gas treatment established.
ISSN:1226-086X
1876-794X
DOI:10.1016/j.jiec.2023.07.017