Enhancing Organic Pollutant Degradation Efficiency through a Photocatalysis-Electro-Fenton System via MoS 2 Crystal Morphology Regulation

• Published in: ACS applied materials & interfaces
• Main Authors: Zhang, Huan, Liu, Chang, Dong, Wenrong, Chen, Peng, Jia, Feifei, Song, Shaoxian
• Format: Journal Article
• Language: English
• Published: United States 29.10.2024
• Subjects: H2O2 in situ generation; photocatalysis−electro-Fenton; contaminant degradation; MoS2 morphology; synergistic effect
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.4c12136

A photocatalysis-electro-Fenton (PEF) system was constructed via molybdenum disulfide (MoS ) to remove tetracycline (TC) without an external oxidant supply and solution pH adjustment. In the system, original graphite felt (GF) was used as a cathode, from which H O was generated continuously under power. MoS was motivated by visible light to facilitate the cycle of Fe /Fe , enhancing the Fenton process to produce OH. The experimental results showed that the system can increase the degradation rate of pollutants by more than 5 times. Moreover, the quenching and electron paramagnetic resonance (EPR) tests demonstrated that OH was the dominant active species. X-ray photoelectron spectroscopy (XPS) characterization, Mo concentration, and cycle experiments proved the excellent catalytic activity and chemical stability of MoS . It is worth mentioning that the photocatalytic performances of different morphologies of MoS (flower, flake, and radar) were compared. As a result, flower-like MoS exhibited a much superior photoresponse than flake and radar, which could accelerate the Fe /Fe cycle further effectively. These findings highlight the morphology-performance relationship of MoS under a PEF system and the mechanisms of contaminant degradation, which is of great significance for developing photoelectric Fenton technology.