Cu-Organic framework-derived V-doped carbon nanostructures for organic dye removal

• Published in: Dalton transactions : an international journal of inorganic chemistry 2021-12, Vol.5 (48), p.18173-18185
• Main Authors: Zhang, Xiao-Sa, Zhao, Hong-Tian, Liu, Yu, Li, Wen-Ze, Yang, Ai-Ai, Luan, Jian
• Format: Article
• Language: English
• Subjects: Adsorption; Carbon; Catalytic activity; Copper oxides; Dicarboxylic acids; Doping; Electronic structure; Functional materials; Metal-organic frameworks; Nanomaterials; Nanoparticles; Nanostructure; Photocatalysis; Photodegradation; Porous materials; Precursors; Room temperature; Ultraviolet radiation; Vanadium; Water treatment
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d1dt03450b

Metal-organic frameworks (MOFs) have recently emerged as a type of uniformly and periodically atom-distributed precursor and efficient self-sacrificial template to fabricate hierarchical porous-carbon-related nanostructured functional materials. In this work, we used Cu( ii ) ions and aromatic dicarboxylic acid to construct [Cu 3 (4,4′-oba) 2 (μ 2 -OH) 2 (H 2 O) 2 ] n (4,4′-H 2 oba = 4,4′-oxybisbenzoic acid) as a precursor for the preparation of carbon nanostructures. Doping foreign elements into intrinsic MOF-based nanomaterials is an effective way to enhance the adsorption property and photocatalytic activity; thus, we designed a facile method to synthesize a vanadium-doped mixture of Cu 2 O and Cu nanoparticles encapsulated in a Cu-MOF-derived carbon nanostructure ( C-V-1 ) in this work for the first time. Benefiting from the protection of the carbon shell and regulation of the electronic structure by doping vanadium and phase-mixing Cu 2 O and Cu, the adsorption capacities of C-V-1 for MB, RhB, MO, CR and GV at room temperature are 174.13, 147.06, 179.92, 275.90 and 611.81 mg g −1 in 240 min, respectively, while the photocatalytic degradation rates are 88.14% for MB, 79.80% for RhB, 71.31% for MO, and 71.19% for CR after 4 h. In addition, the degradation rate is larger than 99.01% for GV after only 30 min of UV irradiation. This strategy of using a diverse MOF as a structural and compositional material to create a multifunctional composite/hybrid may expand the opportunities to explore highly efficient, fast and robust adsorbents and photocatalysts for water treatment. In this study, a novel MOF has been constructed as a precursor for the preparation of carbon nanostructures. Moreover, we have used V metal as a doping agent to boost the adsorption and photodegradation activity of the MOF-derived carbon nanostructures.