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. 2024 Feb 17;29(4):886.
doi: 10.3390/molecules29040886.

Adsorptive Elimination of a Cationic Dye and a Hg (II)-Containing Antiseptic from Simulated Wastewater Using a Metal Organic Framework

Nilanjan Roy  1 , Chanchal Das  1 , Mohuya Paul  2 , Jungkyun Im  2   3 , Goutam Biswas  1
Affiliations

Adsorptive Elimination of a Cationic Dye and a Hg (II)-Containing Antiseptic from Simulated Wastewater Using a Metal Organic Framework

Nilanjan Roy et al. Molecules. .

Abstract

Several types of pollutants have acute adverse effects on living bodies, and the effective removal of these pollutants remains a challenge. Safranin O (a biological dye) and merbromin (a topical mercury-containing antiseptic) are considered organic pollutants, and there are only a few reports on their removal. Synthesized and well-characterized (through PXRD, FTIR, FESEM, and EDS analysis) MOF-5 was used for the first time in the removal of safranin O and merbromin from simulated wastewater and real wastewater. In both cases, MOF-5 effectively removed contaminants. We found that in simulated wastewater, the highest efficiency of removal of safranin O was 53.27% (for 15 mg/L) at pH 10, and for merbromin, it was 41.49% (for 25 mg/L) at pH 6. In the case of real wastewater containing natural ions (Na+, K+, F-, Cl-, SO42-, PO43-, Mg2+, and Ca2+) and other molecules, the removal efficiencies of these two dyes decreased (34.00% and 26.28% for safranin O and merbromin, respectively) because of the presence of other ions and molecules. A plausible mechanism for the removal of these pollutants using MOF-5 was proposed.

Keywords: adsorption; dyes and pharmaceutical wastes; metal organic framework (MOF); natural ions; safranin O and merbromin; wastewater management.

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Conflict of interest statement

The authors declare no competing financial interests.

Figures

Figure 1
Figure 1
Structures of safranin O and merbromin.
Figure 2
Figure 2
(a) PXRD pattern, (b) FTIR spectra, and (c) FESEM image of MOF-5.
Figure 3
Figure 3
Effect of (a) pH, (b) initial concentration of contaminant, (c) amount of adsorbent, and (d) effect of contact time on removal percentage.
Figure 4
Figure 4
(a) Pseudo-first-order plot of safranin O removal, (b) pseudo-first-order plot of merbromin removal, (c) Freundlich isotherm plot of safranin O adsorption, and (d) Freundlich isotherm plot of merbromin adsorption.
Figure 5
Figure 5
(a) Effect of temperature on removal percentage, (b) plot of ln(1/Ce) vs. (1/T).
Figure 6
Figure 6
Comparison of removal percentage in (a) simulated wastewater and surface water containing various ions; (b) desorption of the dyes in different eluents.
Figure 7
Figure 7
Plausible mechanistic pathway for multilayer adsorption of safranin O and merbromin on MOF-5.
See this image and copyright information in PMC

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