Nanoporous bimetallic metal-organic framework (FeCo-BDC) as a novel catalyst for efficient removal of organic contaminants

• Published in: Environmental pollution (1987) 2019-12, Vol.255 (Pt 2), p.113337, Article 113337
• Main Authors: Li, Huanxuan, Zhang, Jian, Yao, Yuze, Miao, Xiangrui, Chen, Jiale, Tang, Junhong
• Format: Article
• Language: English
• Subjects: Catalysis; Catalytic performance; Characterization; FeCo-BDC; Hydroxyl Radical - chemistry; Metal-Organic Frameworks - chemistry; Metals; Microscopy, Electron, Scanning; Microscopy, Electron, Transmission; Models, Chemical; Nanopores; Organic Chemicals - chemistry; Peroxides; Peroxymonosulfate (PMS); Photoelectron Spectroscopy; Spectroscopy, Fourier Transform Infrared; Sulfates; Synthesis; Temperature; X-Ray Diffraction
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2019.113337

In this work, we report on the synthesis and characterization of nanoporous bimetallic metal-organic frameworks (FeCo-BDC). Effects of synthesis time and temperature on the structures, morphology, and catalytic performance of FeCo-BDC were investigated. Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) were used to reveal the morphological and textural characteristics. The crystal structure and chemical composition of FeCo-BDC were determined by means of X-ray powder diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Photoelectron Spectroscopy (XPS), and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) measurements. Interestingly, FeCo-BDC grew into the same crystal structure with different morphology in the temperature of 110–150 °C with 12–48 h. The heterogeneous catalytic activity of FeCo-BDC was tested to activate peroxydisulfate (PDS) and peroxymonosulfate (PMS) for removal of methylene blue (MB). The results found that FeCo-BDC synthesized at 150 °C with 24 h exhibited the best catalytic performance for PMS and obtained 100% of MB removal within 15 min. The abundant unsaturated metal active sites of Fe(II) and Co(II) in the skeleton of FeCo-BDC made a great contribution to the generation of sulfate (▪) and hydroxyl radicals (OH), which resulted in the excellent performance for MB degradation. [Display omitted] •FeCo-BDC with mesoporous and microporous structure was facile synthesized.•The same crystal structure of FeCo-BDC had diverse morphology.•The nodes of bimetallic MOFs presented with unsaturated sites of Fe(II) and Co(II).•FeCo-BDC showed excellent performance for removal of contaminants.•▪ and OH were identified as the primary reactive species