Abstract
Methods to remove dye pollutants with natural enzyme, like horseradish peroxidase (HRP), are still limited due to high costs and low stability levels. The development of such a method with similar enzymatic activity is important and could be helpful in wastewater disposal. A metal organic framework material, Fe-loaded MOF-545 (Fe), was synthesized in our study as a new way to remove dyes due to its peroxidase-like activity. The structural characterizations of Fe-loaded MOF-545(Fe) was investigated using scanning electron microscopy (SEM), UV-Vis absorption spectra, and X-ray diffraction (XRD). The peroxidase-like (POD-like) activity of Fe-loaded MOF-545(Fe) was investigated under different pH and temperature conditions. Because of the Fe added into the MOF-545 structure, the absorption of Fe-loaded MOF-545(Fe) for acid (anionic) dyes (methyl orange (MO)) was better than for basic (cationic) dyes (methylene blue (MB)). The Fe-loaded MOF-545(Fe) could give a significant color fading for MO and MB over a short time (about two hours) with peroxidase-like activity. The remarkable capacity of Fe-loaded MOF-545(Fe) to remove the MO or MB is due to not only physical adsorption, but also degradation of the MO and MB with POD-like activity. Therefore, Fe-loaded MOF-545(Fe) has significant potential regarding dye removal from wastewater.
Highlights
In recent years, dyes have been widely used to color the products in many industries, such as dyestuffs, paper, leather, plastic, rubber, and cosmetics [1]
With the Fe metalized into metal-organic frameworks (MOFs)-545, the Fe-loaded MOF-545(Fe) can catalyze the substrates with its peroxidase-like activity, which avoids the utilization of the complicated photocatalytic systems
Fe-loaded MOF-545(Fe) upon reaction with acidic/basic dyes was detected by UV-Vis spectroscopy
Summary
Dyes have been widely used to color the products in many industries, such as dyestuffs, paper, leather, plastic, rubber, and cosmetics [1]. Molecules 2020, 25, 168 method because of its simplicity and efficiency [5] Several adsorbents, such as activated carbons, clay materials, and multifunctional nanoparticles are used to remove dyes to purify polluted water [10,11,12,13]. With the Fe metalized into MOF-545, the Fe-loaded MOF-545(Fe) can catalyze the substrates with its peroxidase-like activity, which avoids the utilization of the complicated photocatalytic systems. The. Fe-loaded MOF-545(Fe) was acting as an effective peroxidase mimic with a substrate binding affinity (Km ) and a catalytic activity (kcat ) superior to heme in aqueous media. To clarify the enzymatic properties of Fe-loaded MOF-545(Fe), the classical peroxidase substrate 3,3,5,5-tetra-methyl-benzidine (TMB) was studied in our work.
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