Abstract
Metal-organic frameworks (MOFs) are considered as good materials for the adsorption of many environmental pollutants. In this study, magnetic Fe3O4/MIL-88A composite was prepared by modification of MIL-88A with magnetic nanoparticles using the coprecipitation method. The structures and magnetic property of magnetic Fe3O4/MIL-88A composite were characterized and the adsorption behavior and mechanism for Bromophenol Blue (BPB) were evaluated. The results showed that magnetic Fe3O4/MIL-88A composite maintained a hexagonal rod-like structure and has good magnetic responsibility for magnetic separation (the maximum saturation magnetization was 49.8 emu/g). Moreover, the maximum adsorption amount of Fe3O4/MIL-88A composite for BPB was 167.2 mg/g and could maintain 94% of the initial adsorption amount after five cycles. The pseudo-second order kinetics and Langmuir isotherm models mostly fitted to the adsorption for BPB suggesting that chemisorption is the rate-limiting step for this monomolecular-layer adsorption. The adsorption capacity for another eight dyes (Bromocresol Green, Brilliant Green, Brilliant Crocein, Amaranth, Fuchsin Basic, Safranine T, Malachite Green and Methyl Red) were also conducted and the magnetic Fe3O4/MIL-88A composite showed good adsorption for dyes with sulfonyl groups. In conclusion, magnetic Fe3O4/MIL-88A composite could be a promising adsorbent and shows great potential for the removal of anionic dyes containing sulfonyl groups.
Highlights
The textile industry is one of the most chemically intensive industries on Earth and the major polluter of potable water
The pseudo-second order kinetics and Langmuir isotherm models mostly fitted to the adsorption for Bromophenol Blue (BPB) suggesting that chemisorption is the rate-limiting step for this monomolecular-layer adsorption
The present study reports the successful synthesis of magnetic composite Fe3 O4 /MIL-88A and its use for the adsorption of BPB in order to evaluate its feasibility as a novel adsorbent in environmental remediation
Summary
The textile industry is one of the most chemically intensive industries on Earth and the major polluter of potable water. Various physicochemical and biological methods for treating dye effluents have been reported, such as adsorption, precipitation, chemical degradation, advanced oxidation processes, biodegradation and chemical coagulation [5] These methods have been widely applied, they have some disadvantages. MOFs are a class of crystalline materials made by linking metal clusters or ions and organic linkers through covalent bonds Owing to their highly ordered structures, high porosity and large surface areas, MOFs have attracted intensive attention in gas storage [15], molecular sensing [16], catalysis [17], energy [18], and water remediation [14]. Many kinds of MOF-based materials such as rod-like metal-organic framework nanomaterial and MOF composites have been successfully synthesized and are widely used to remove dyes from wastewater [19,20,21,22]. As a superior adsorbent material, Fe3 O4 /MIL-88A showed proper magnetic response for shortening reaction time and excellent adsorption ability for the removal of dyes
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