Oversized macroporous flower-like Cu9S8 used as an efficient peroxidase mimetic enzyme for the degradation of organic dyes. (April 2022)

• Record Type: Journal Article
• Authors: Cheng, Ju; Wu, Shouying; Zhang, Linping; Zhou, Peiwen; Zhong, Yi; Xu, Hong; Mao, Zhiping
• Is Part Of: Journal of physics and chemistry of solids. Volume 163(2022)
• Publication Date: 2022-04
• Subjects: Macroporous structure -- Heterogeneous system -- Sacrificial template -- Peroxidase mimetic -- Copper; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2021.110534
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The development of a high-efficiency and stable heterogeneous catalyst has great significance for the recycling treatment of printing and dyeing wastewater. The flower-like Cu9 S8 with super large macroporous (d = 133.78 nm) was prepared using porous CuO that was synthesized by the sacrificial template method. The peroxidase mimics activity of flower-like Cu9 S8 was determined by catalytic oxidation of 3, 3′, 5, 5′-tetramethylbenzidine (TMB) with H2 O2 . The kinetic constants (Km = 0.449 mM) displayed that the flower-like Cu9 S8 showed excellent affinity to H2 O2, which was 8 times lower than that of horseradish peroxidase (HRP). The results of degradation experiments on different kinds of organic dyes showed that the Cu9 S8 had a wide application range in the degradation of different dyes with the degradation rate over 98%, and the removal rate of total organic carbon reached 78.2%. The flower-like Cu9 S8 can be a candidate catalyzer in the field of printing and dyeing wastewater treatment due to its high catalytic cycle stability and wide pH application range (3.0–8.0). Graphical abstract: Image 1 Highlights: The large pore size flower-like Cu9 S8 (d = 133.78 nm) was prepared by the sacrificial template method. The affinity of flower-like Cu9 S8 to H2 O2 is 8 times higher than that of HRP (Km = 0.449 mM). Flower-like Cu9 S8 has a strong universality for organic dyes, and the TOC removal rate reaches 78.2%.