Bi₂O₃ and g-C₃N₄ quantum dot modified anatase TiO₂ heterojunction system for degradation of dyes under sunlight irradiation

Abstract

A facile and feasible method was successfully utilized to incorporate Bi 2 O 3 and g-C 3 N 4 quantum dots on TiO 2 surface to synthesize a novel composite g-C 3 N 4 /TiO 2 /Bi 2 O 3 . The photocatalytic activity of the composite g-C 3 N 4 /TiO 2 /Bi 2 O 3 for degradation of dyes under sunlight and UV light irradiation was evaluated. It possessed the higher photocatalytic performance than that of pristine TiO 2 or g-C 3 N 4 under the same conditions. Under sunlight irradiation, the reaction rate constants of the g-C 3 N 4 /TiO 2 /Bi 2 O 3 was about 4.2 times and 3.3 times higher than that of TiO 2 and g-C 3 N 4 , 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 TiO 2 -based semiconductors by incorporating different quantum dots and promoting the efficiency of the photocatalysts in practical application.

Fabrication of novel oxochalcogens halides of manganese and tin nanocomposites as highly efficient photocatalysts for dye degradation and excellent antimicrobial activity

“…Due to rapid population growth, the demand for water is increasing day by day (Shanmugaratnam, Rasalingam;Lv et al, 2020). Many scientists have focused and worked on efficient techniques for removing these non-biodegradable industrial pollutants from wastewater before they enter the environment (Peng et al, 2020). Several techniques such as adsorption, chlorination, filtration, and air stripping, coagulation, and membrane processes are traditional methods of treating water that are costly, time-consuming, and sometimes hazardous (Ranson et al, 2015;von Gunten, 2018;Bethi et al, 2016).…”

Synthesis of CdS-loaded (CuC10H26N6)3(PW12O40)2 for enhanced photocatalytic degradation of tetracycline under simulated solar light irradiation

“…Engineering semiconductive heterojunctions can extend light absorption range, promote catalytic ability and bolster chemical stability. 30,31 In this regard, the cadmium sulde (CdS) is a good heterojunctional part due to its solar radiance acceptance, 32 redox potential and high efficiency separation of photoinduced electron-hole pairs. 33 Despites these merits, the CdS suffers from easy photocorrosion due to the positively charged holes can oxidize S 2À ions to S 0 phase.…”

ZnO/Graphene Oxide on Halloysite Nanotubes as a Superabsorbent Nanocomposite Photocatalyst for the Degradation of Organic Dyes

“…Table S1: Summary of the photocatalytic rhodamine B degradation of the various reported materials at direct sunlight. References [ 51 , 52 , 53 , 54 , 55 , 56 , 57 ] are cited in the Supplementary Materials.…”