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. 2022 Jul 12;8(7):e09942.
doi: 10.1016/j.heliyon.2022.e09942. eCollection 2022 Jul.

Porous NH2-MIL-101(Fe) metal organic framework for effective photocatalytic degradation of azo dye in wastewater treatment

Xuezhong Li  1 , Yue Wang  2 , Qi Guo  3
Affiliations

Porous NH2-MIL-101(Fe) metal organic framework for effective photocatalytic degradation of azo dye in wastewater treatment

Xuezhong Li et al. Heliyon. .

Abstract

The porous iron-based metal organic frameworks (NH2-MIL-101(Fe)), which consists of 2-amino benzene dicarboxylic acid (H2BDC-NH2) and ferrous ions were synthesized through one-step hydrothermal method. The surface area and pore volume of as-synthesized NH2-MIL-101(Fe) were 66.48 m2/g and 0.09 cm3/g, respectively. The excellent photocatalytic performance endows NH2-MIL-101(Fe) to generate hydroxyl radical (•OH), which then acting as efficiently active sites for azo dye degradation in wastewater. Meanwhile, the outstanding stability ability of NH2-MIL-101(Fe) indicates the potential candidate for wastewater treatment.

Keywords: Azo dye; Hydroxyl radical; NH2-MIL-101(Fe); Wastewater treatment.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Image 1
Graphical abstract
Figure 1
Figure 1
Basic characterization of NH2-MIL-101(Fe). (a) Schematic illustration of the formation mechanism of NH2-MIL-101(Fe). (b) The SEM image and (c) TEM image of NH2-MIL-101(Fe). (d) The X-ray diffraction pattern of NH2-MIL-101(Fe). (e) The TGA curve of NH2-MIL-101(Fe) from room temperature to 850 °C.
Figure 2
Figure 2
The TEM image of NH2-MIL-101(Fe) after keeping in ambient temperature for 2 months.
Figure 3
Figure 3
The FTIR spectra curve for NH2-MIL-101(Fe).
Figure 4
Figure 4
(a) XPS full spectra and (b) high-resolution Fe 2p for NH2-MIL-101(Fe).
Figure 5
Figure 5
(a) Schematical illustration of peroxidase activity of NH2-MIL-101(Fe) and (b) fluorescent absorbance of terephthalic acid after treated with different concentration of NH2-MIL-101(Fe).
Figure 6
Figure 6
N2 adsorption-desorption isotherm and pore size (insert figure) of NH2-MIL-101(Fe).
Figure 7
Figure 7
(a) Photocatalytic degradation efficiency of DTB5B dyes treated with NH2-MIL-101(Fe) (15, 31, 62, 125 μg/mL) for different time under 300 W Xenon lamp (b1-b4) The absorption curve of photocatalytic degradation system treated with various concentration of NH2-MIL-101(Fe).
Figure 8
Figure 8
The first order photocatalytic dye degradation at different NH2-MIL-101(Fe) concentration.
Figure 9
Figure 9
The photocatalytic efficiency of NH2-MIL-101(Fe) during the five cycles process.
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