Synthesis of CaWO4 as a Photocatalyst for Degradation of Methylene Blue and Carmine under Ultraviolet Light Irradiation

Cunyang Yuan; Fuwei Sun; Haibo Liu; Tianhu Chen; Ziyang Chu; Hanlin Wang; Xuehua Zou; Peixun Zhai; Dong Chen

LAPSE

Living Archive for Process Systems Engineering

LAPSE:2023.35128

Published Article

LAPSE:2023.35128

Synthesis of CaWO4 as a Photocatalyst for Degradation of Methylene Blue and Carmine under Ultraviolet Light Irradiation

Cunyang Yuan, Fuwei Sun, Haibo Liu, Tianhu Chen, Ziyang Chu, Hanlin Wang, Xuehua Zou, Peixun Zhai, Dong Chen

April 28, 2023

Photocatalysis is considered a promising method for wastewater treatment; however, most synthesized photocatalysts have complex structures and are costly. Thus, in this study, a novel CaWO4 sample was synthesized by a co-precipitation method in one step. The characteristic results show that CaWO4 has good dispersibility, a large specific surface area, and good photoresponse under UV light. The synthesized CaWO4 can be used to degrade methylene blue (MB) and carmine (CR) under UV light without the addition of oxidants. The effects of a water matrix, including pH value, solid−liquid ratio, light intensity, and initial concentration of pollutants on photocatalytic degradation were studied. According to the optimization of these factors, the optimal photocatalytic degradation condition was found under the catalyst concentration of 1.0 g/L and ultraviolet light intensity of 80 W. The optimal pH is 8.2 for the MB system and 6.0 for the CR system. The optimal photocatalytic degradation of MB and CR at 100 mg/L can be achieved as 100%. According to the results of scavenger experiments, holes and hydroxyl radicals dominate the degradation of MB while hydroxyl radicals and superoxide anions are mainly responsible for the degradation of CR. Further analyses showed that photogenerated electrons generated on the surface of the CaWO4 can form electron−hole pairs, thereby producing hydroxyl radicals and superoxide anions to degrade dyes. In addition, the CaWO4 has a good cycling performance in the process of degrading MB (more than 80% after five cycles). It provides a new idea for the photocatalytic degradation of dyes using mineral-like materials.

Record ID

LAPSE:2023.35128

Keywords

calcium tungstate, dye, free radical, mechanism, photocatalysis

Subject

Materials

Suggested Citation

Yuan C, Sun F, Liu H, Chen T, Chu Z, Wang H, Zou X, Zhai P, Chen D. Synthesis of CaWO4 as a Photocatalyst for Degradation of Methylene Blue and Carmine under Ultraviolet Light Irradiation. (2023). LAPSE:2023.35128

Author Affiliations

Yuan C: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Sun F: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Liu H: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Chen T: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Chu Z: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Wang H: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Zou X: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Zhai P: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive
Chen D: Key Laboratory of Nano-Minerals, Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei 230009, China; Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei Unive [ORCID]

Journal Name

Processes

Volume

11

Issue

4

First Page

1050

Year

2023

Publication Date

2023-03-31