Co78Si8B14 metallic glass: A highly efficient and ultra-sustainable Fenton-like catalyst in degrading wastewater under universal pH conditions. (20th June 2022)

• Record Type: Journal Article
• Authors: Qin, Xindong; Xu, Jiliang; Zhu, Zhengwang; Li, Zhengkun; Fang, Dawei; Fu, Huameng; Zhang, Shiming; Zhang, Haifeng
• Is Part Of: Journal of materials science & technology. Volume 113(2022)
• Page Start: 105
• Page End: 116
• Publication Date: 2022-06-20
• Subjects: Metallic glass -- Wastewater degradation -- Catalytic applications; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.10.024
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: Co-based MGs are applied as Fenton-like catalysts in the field of wastewater treatment for the first time. High performance with unforeseen reactive and recycling abilities over universal pH values is realized. Hydroxyl radicals and Co 3+ play a dominant role in wastewater degradation under acidic and alkaline environments, respectively. Abstract: Overcoming the pH limitation and increasing the catalyst reusability remain pressing demands for metallic glass (MG) in wastewater remediation. Herein, Co78 Si8 B14 MG ribbons are used to degrade dye wastewater by activating hydrogen peroxide (H2 O2 ) as Fenton-like catalysts. The Co-based MG catalysts exhibit high degradation efficiency under both acidic and alkaline conditions, and the kinetic reaction rate at pH 10 (0.176 min −1 ) and pH 4 (0.089 min −1 ) is 5.9 and 1.2 times higher than that of the extensively studied Fe-based MG catalysts, respectively. Impressively, the Co-based MG catalysts can be reused up to 20–60 times at universal pH conditions, demonstrating fairly good reusability. The newly discovered Co-based MG catalysts do not follow the classical Fenton reactions with H2 O2 the way Fe-based MGs do. In an acid environment, hydroxyl radicals play a dominant role in the degradation, while in an alkaline environment, the effect of hydroxyl radicals is weakened, and Co 3+ ions exert a relatively major function on the degradation. The excellent performance in catalytic activity and reusability at universal pH conditions of the Co-based MGs will inspire the development of MGs in wastewater treatment.