Using Electrolytic Manganese Residue to prepare novel nanocomposite catalysts for efficient degradation of Azo Dyes in Fenton-like processes. (August 2020)

• Record Type: Journal Article
• Authors: Lan, Jirong; Sun, Yan; Huang, Ping; Du, Yaguang; Zhan, Wei; Zhang, Tian C.; Du, Dongyun
• Is Part Of: Chemosphere. Volume 252(2020)
• Publication Date: 2020-08
• Subjects: Azo dyes -- Electrolytic manganese residue -- Catalyst -- Nanocomposite -- AOPs; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126487
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this study, Electrolytic Manganese Residue (EMR) was treated by EDTA-2Na/NaOH, ultrasonic etching, and hydrothermal reaction to obtain a novel nanocomposite catalyst (called N-EMR), which then was used, together with H2 O2, to treat synthetic textile wastewater containing Reactive Red X–3B, Methyl Orange, Methylene blue and Acid Orange 7. Results indicated that the N-EMR had a nano-sheet structure in sizes of 100–200 nm; new iron and manganese oxides with high activity were produced. The mixture of a small amount of N-EMR (40 mg/L) and H2 O2 (0.4 × 10 −3 M) could removal about 99% of azo dyes (at 100 mg/L in 100 mL) within 6–15 min, much faster than many advanced oxidation processes (AOPs) reported in the literature. The elucidation of the associated mechanism for azo dyes degradation indicates that azo dyes were attacked by superoxide radicals, hydroxyl radicals, and electron holes generated within system. N-EMR was found to be reusable and showed limited inhibition by co-existing anions and cations. Moreover, high removal efficiency of azo dyes could happen in the system with a wide range of pH (1–8.5) and temperatures (25–45 °C), indicating that the process developed in this study may have broad application potential in treatment of azo dyes contaminated wastewater. Graphical abstract: Image 1 Highlights: For the first time, EMR were modified as a novel nanocomposite. The preparation method is eco-friendly and efficient. The N-EMR + H2 O2 system is efficient for Azo dyes removal and mineralization. The N-EMR is stable and reusable. The N-EMR + H2 O2 system is much more efficient than conventional AOPs.