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. 2023 Jan 13;13(2):336.
doi: 10.3390/nano13020336.

Development of MOF Based Recyclable Photocatalyst for the Removal of Different Organic Dye Pollutants

Narasimharao Kitchamsetti  1   2 , Chidurala Shilpa Chakra  2 , Ana Lucia Ferreira De Barros  3 , Daewon Kim  1
Affiliations

Development of MOF Based Recyclable Photocatalyst for the Removal of Different Organic Dye Pollutants

Narasimharao Kitchamsetti et al. Nanomaterials (Basel). .

Abstract

The preparation of metal organic frameworks (MOFs) has come to the forefront in recent years because of their outstanding physical and chemical properties. Many MOFs such as Zn, Co, Ni, Fe, and Ag, etc., have been successfully synthesized. In this work, we followed the solvothermal assisted route to synthesize Ag-MOF (abbreviated as AMOF) nanosheets and then applied them as a photocatalyst to remove different organic pollutants, namely methyl orange (MO), crystal violet (CV), and methylene blue (MB). Chemical composition, optical properties, morphology, and microstructural analysis were analyzed using XPS, UV-visible spectrophotometer, FESEM, TEM, and EDS, respectively. The structural properties of AMOF nanosheets were studied by X-ray diffraction (XRD). Nitrogen adsorption and desorption isotherm analysis were utilized to evaluate the specific surface area and pore size of the AMOF nanosheets. Further, AMOF nanosheets showed notable photocatalytic performance for various dye pollutants degradation. The results confirmed 74.5, 85.5, and 90.7% of MO, CV, and MB dye pollutants removal after 120 min of irradiation with the rate constants (k) of 0.0123, 0.0153, and 0.0158 min-1, respectively. The effect of superoxide radicals (O2-) and photogenerated holes (h+) on the organic dye pollutants removal was investigated using radical scavenger trapping studies. Moreover, the stability study also confirmed the recyclability of the photocatalyst. Therefore, the findings of this research present a realizable method to grow AMOF photocatalyst for successful degradation of various dye pollutants.

Keywords: metal organic framework; nanosheets; organic pollutant; photocatalyst; solvothermal.

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Conflict of interest statement

The authors declare that they have no known competing financial interest or personal relationships that could have influenced the work reported in this paper.

Figures

Figure 1
Figure 1
Schematic demonstration of AMOF formation.
Figure 2
Figure 2
FESEM analysis of AMOF at (a) low, and (b) high magnification. (c) EDS spectra of AMOF, and (d–g) elemental mapping of Ag, C, and O, respectively in AMOF nanosheets.
Figure 3
Figure 3
(a) XRD spectra, (b) FTIR analysis of AMOF, (c,d) TEM images at low and high magnifications. (e) HRTEM image and (f) SAED pattern of AMOF.
Figure 4
Figure 4
(a) XPS survey spectra of AMOF, (b) Ag 3d, (c) C 1s, and (d) O 1s spectra.
Figure 5
Figure 5
(a) UV-vis absorption spectra of AMOF nanosheets, and (b) bandgap measurements attained from the Tauc plot.
Figure 6
Figure 6
Surface area and pore size analysis of AMOF: (a) nitrogen adsorption–desorption isotherm and (b) pore size distribution.
Figure 7
Figure 7
The absorption spectra for the presence of (a) 30, (b) 20, and (c) 10 ppm of CV dye amassed at regular intervals for 120 min of photocatalytic irradiation. (d) Histogram of dye removal efficiency, (e) kinetic plots, and (f) corresponding pseudo-first-order kinetic curves evaluated for photo catalytically degraded CV dye in the presence of AMOF nanosheets at numerous times of irradiation.
Figure 8
Figure 8
The absorption spectra in the presence of (a) 10, (b) 25, and (c) 50 mg of AMOF nanosheets of CV dye amassed at regular intervals for 120 min of photocatalytic irradiation. (d) Histogram of dye removal efficiency, (e) kinetic plots and (f) corresponding pseudo-first-order kinetic curves evaluated for photo catalytically degraded CV dye in the presence of AMOF nanosheets at numerous times of irradiation.
Figure 9
Figure 9
The absorption spectra with respect to the different illumination times of (a) MB, and (b) MO dyes collected at regular intervals for 120 min of photocatalytic irradiation in the presence of 50 mg of AMOF nanosheets.
Figure 10
Figure 10
(a) Kinetic curves, (b) corresponding pseudo-first-order kinetic plots, and (c) histogram of dye removal efficiency evaluated for photo catalytically removed MO, CV, and MB dyes in the presence of 50 mg of AMOF nanosheets at numerous times of irradiation.
Figure 11
Figure 11
(a) Effect of different scavengers, and (b) cyclic stability study of AMOF nanosheets on photocatalytic removal of MB dye.
Figure 12
Figure 12
Schematic illustration of the photocatalytic performance of AMOF nanosheets in the removal of organic dye pollutants.
See this image and copyright information in PMC

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