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Magnetic Carnosine-Based Metal-Organic Framework Nanoparticles: Fabrication, Characterization and Application As Arsenic Adsorbent Publisher



Keykhaee M1 ; Razaghi M2 ; Dalvand A3 ; Salehian F1 ; Soleimani H4 ; Samzadehkermani A5 ; Shamsollahi HR4 ; Foroumadi A1 ; Ramazani A2 ; Khoobi M1 ; Alimohammadi M4
Authors

Source: Journal of Environmental Health Science and Engineering Published:2020


Abstract

This study centers on the controllable synthesis, characterization, and application of a novel magnetic bio-metal-organic framework (Bio-MOF) for the adsorption and subsequent removal of arsenic from aqueous solutions. Zinc ions and carnosine (Car) were exploited to construct the Car-based MOF on the surface of magnetite (Fe3O4 NPs). The Magnetite precoating with Car led to an increase in the yield and the uniform formation of the magnetic MOF. The prepared magnetic Bio-MOF nanoparticles (Fe3O4-Car-MOF NPs) had semi-spherical shape with the size in the range of 35–77 nm, and the crystalline pattern of both magnetite and Car-based MOF. The NPs were employed as an adsorbent for arsenic (As) removal. The adsorption analyses revealed that all studied independent variables including pH, adsorbent dose, and initial arsenic concentration had a significant effect on the arsenic adsorption, and the adsorption data were well matched to the quadratic model. The predicted adsorption values were close to the experimental values confirming the validity of the suggested model. Furthermore, adsorbent dose and pH had a positive effect on arsenic removal, whereas arsenic concentration had a negative effect. The adsorption isotherm and kinetic studies both revealed that As adsorption fitted best to the Freundlich isotherm model. The maximum monolayer adsorption capacity (94.33 mg/g) was achieved at room temperature, pH of 8.5 and adsorbent dose of 0.4 g/L. Finally, the results demonstrated that the adsorbent could be efficiently applied for arsenic removal from aqueous environment. Graphical abstract: [Figure not available: see fulltext.] © 2020, Springer Nature Switzerland AG.
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