Preparation of ZnFe2O4@TiO2 Novel Core-Shell Photocatalyst by Ultrasonic Method and Its Photocatalytic Degradation Activity

Abstract

ZnFe2O4 microspheres were prepared by solvothermal method, and a novel ZnFe2O4@TiO2 core-shell composite photocatalyst was prepared by ultrasonic (denoted as ZT-x) and mechanical stirring (denoted as ZTM-1.2). The morphology, structure, magnetic, and optoelectronic properties of the catalyst were investigated comprehensively, and the degradation performance of the catalyst was explored through the photocatalytic degradation of Rhodamine B (RhB) under UV light. The concentration of RhB was 10 mg/L, and the catalyst concentration was 0.3 g/L. ZT-1.2 showed the best photocatalytic degradation activity, and the degradation rate of RhB reached 97.3% within 60 min. The degradation ability of the catalyst was further evaluated by Methylene blue (MB), Methyl orange (MO), Phenol, and Ofloxacin (OFX). ZT-1.2 also exhibited excellent stability. The improved catalyst degradation performance was attributed to constructing a Z-type heterojunction. Moreover, the low-efficiency degradation of ZTM-1.2 was caused by catalyst agglomeration and low TiO2 loading, confirming the superiority of the ultrasonic method and providing a new method for the preparation of magnetically recoverable TiO2-based core-shell photocatalyst.

Photocatalytic Valorization of Plastic Waste over Zinc Oxide Encapsulated in a Metal–Organic Framework

“…It can be concluded that the charges transfer pathway conformed to the Z‐scheme structure mechanism, and a similar Z‐scheme heterojunction has been widely reported. [ 50,51 ] Encouraged by the above results, the mechanism involved in photocatalytic PLA conversion over the heterojunction ZnO/UiO66‐NH 2 photocatalysts was proposed (Figure 4e). In detail, under light excitation, ZnO and UiO66‐NH 2 were excited to generate electrons and holes in their CB and VB, respectively.…”

A Novel SnO2/ZnFe2O4 Magnetic Photocatalyst with Excellent Photocatalytic Performance in Rhodamine B Removal

“…ZnFe 2 O 4 is a spinel-type n-type semiconductor material that has a narrow bandgap (1.9 eV) and excellent visible light absorption capability and possesses outstanding magnetic properties, making it attracted the attention of domestic and foreign researchers [25][26][27]. ZnFe 2 O 4 can effectively absorb visible light and effectively compound with TiO 2 [28], ZnO [29], Ag nanoparticles [30], and BiOCl [31] et al, which can achieve full coverage of ultraviolet and visible wavelengths. In recent years, the composite of tin oxide materials with magnetic substrates has also been widely studied.…”