Bi2O3 and g-C3N4 quantum dot modified anatase TiO2 heterojunction system for degradation of dyes under sunlight irradiation. Issue 2 (7th January 2020)

• Record Type: Journal Article
• Authors: Peng, Weidong; Yang, Chun; Yu, Jiang
• Is Part Of: RSC advances. Volume 10:Issue 2(2020)
• Page Start: 1181
• Page End: 1190
• Publication Date: 2020-01-07
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra07424d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A facile and feasible method was successfully utilized to incorporate Bi2 O3 and g-C3 N4 quantum dots on TiO2 surface to synthesize a novel composite g-C3 N4 /TiO2 /Bi2 O3 . Abstract : A facile and feasible method was successfully utilized to incorporate Bi2 O3 and g-C3 N4 quantum dots on TiO2 surface to synthesize a novel composite g-C3 N4 /TiO2 /Bi2 O3 . The photocatalytic activity of the composite g-C3 N4 /TiO2 /Bi2 O3 for degradation of dyes under sunlight and UV light irradiation was evaluated. It possessed the higher photocatalytic performance than that of pristine TiO2 or g-C3 N4 under the same conditions. Under sunlight irradiation, the reaction rate constants of the g-C3 N4 /TiO2 /Bi2 O3 was about 4.2 times and 3.3 times higher than that of TiO2 and g-C3 N4, respectively. The promising photocatalytic performance was attributed to the broader light absorption range and efficient separation of photoinduced carriers. Moreover, based on the TEM, XPS, XRD, UV-vis spectrum, radicals scavenging test and Mott–Schottky analysis systematic mechanism for photodegradation process was proposed. This work provides a promising strategy for the modification of TiO2 -based semiconductors by incorporating different quantum dots and promoting the efficiency of the photocatalysts in practical application.