Photocatalytic MOF fibrous membranes for cyclic adsorption and degradation of dyes
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Photocatalytic MOF fibrous membranes for cyclic adsorption and degradation of dyes Jiming Huang1,2, Ding Huang1, Fanbao Zeng1, Long Ma1, and Zhengbang Wang1,*
1
Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China 2 School of Material and Chemical Engineering, Tongren University, Tongren 554300, China
Received: 15 August 2020
ABSTRACT
Accepted: 16 October 2020
Metal–organic frameworks (MOF) have attracted great attention in the field of wastewater treatment. When MOF nanoparticles are used for adsorption applications, the nanoparticles normally have to be separated from the dispersed suspension by filtration or centrifugation for regeneration or recycling. In order to avoid this costly and time consuming process, MOF (NH2-MIL-125) nanofibrous hybrid membranes with photocatalytic properties were successfully fabricated in this study. The MOF membranes were characterized by using XRD, SEM, FTIR, TGA, BET, and UV–Vis. The adsorption (including capacity, mechanism, dynamic, and isotherm) of dyes by the membranes is studied in great detail. The membranes exhibit great adsorption capacity to methylene blue and sodium fluorescein, and the adsorption is dominated by steric hindrance of dye molecule, not the p–p interactions and the zeta potential. Most importantly, the MOF membranes could be easily separated from the dyes solution and regenerated via a visible light catalytic degradation process for recycling, and the photocatalytic mechanism is discussed.
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Handling Editor: Chris Cornelius.
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https://doi.org/10.1007/s10853-020-05473-x
J Mater Sci
GRAPHICAL ABSTRACT
Introduction Pollutants from different industries including metals, dyes, biodegradable waste, pesticides, antibiotics, phosphates, pharmaceuticals, and personal care products have been posing a significant threat to living beings owing to their toxicity and carcinogenicity [1]. Synthetic dye-stuffs, a category of important industrial chemicals, are extensively used in various industries like textile, leather tanning, paper, etc. Generally, dyes are complex aromatic compounds with large structural diversity that always possess a high degree of chemical, biological, and photostability [2, 3]. The presence of the dyes in water, even less than 1 mg L-1, is highly visible and undesirable [4]. Dyes have become one of the main sources of severe water pollution, and removal of these organic contaminants before discharged into the environment is essential. A wide range of methods such as ozonation, biological treatments, membrane filtration, advanced oxidation processes (AOPs), coagulation, and adsorption [5] have been employed for the removal of organic dyes from wastewater. Among the proposed techniques, the adsorption is effective with simple design and
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