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. 2021 Mar 9;11(17):9977-9984.
doi: 10.1039/d1ra01027a. eCollection 2021 Mar 5.

Removal of tetracycline hydrochloride from wastewater by Zr/Fe-MOFs/GO composites

Fuhua Wei  1 , Qinhui Ren  1 , Huan Zhang  1 , Lili Yang  1 , Hongliang Chen  1 , Zhao Liang  2 , Ding Chen  2
Affiliations

Removal of tetracycline hydrochloride from wastewater by Zr/Fe-MOFs/GO composites

Fuhua Wei et al. RSC Adv. .

Abstract

Zirconium-iron metal-organic frameworks (Zr/Fe-MOFs) and Zr/Fe-MOF/graphene oxide (GO) composites were prepared via solvothermal synthesis using ferrous sulfate heptahydrate, zirconium acetate, and 1,3,5-benzenetricarboxylic acid. The MOFs and composites were measured using scanning electron microscopy (SEM), infrared spectrometry (IR), and thermogravimetric analysis (TGA). In this study, we explored the ability of Zr/Fe-MOFs and Zr/Fe-MOF/GO composites to adsorb tetracycline hydrochloride from an aqueous solution. Additionally, we optimized the adsorption performance by varying the ratio of MOFs and MOF composites to tetracycline hydrochloride solution, the concentration of tetracycline hydrochloride solution, and the pH of the solution. The results were investigated and fit to both pseudo-first-order and pseudo-second-order kinetic models. The results of the Freundlich and Langmuir isotherm models indicate that Zr/Fe-MOFs and Zr/Fe-MOF/GO composites have heterogeneous adsorption surfaces and that tetracycline hydrochloride is adsorbed over Zr/Fe-MOFs and Zr/Fe-MOF/GO by multilayer adsorption. Overall, our findings indicate that Zr/Fe-MOFs and Zr/Fe-MOF/GO composites can effectively treat wastewater, providing an inexpensive alternative to other methods.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. IR of MOFs.
Fig. 2
Fig. 2. (a and b) SEM of MOFs.
Fig. 3
Fig. 3. TG of MOFs.
Fig. 4
Fig. 4. Removal rates of tetracycline hydrochloride (a Zr/Fe-MOFs; b Zr/Fe-MOFs/GO).
Fig. 5
Fig. 5. The removal efficiencies of different doses of MOFs on tetracycline hydrochloride.
Fig. 6
Fig. 6. Effect of pH on the adsorption amount of tetracycline hydrochloride.
Fig. 7
Fig. 7. Comparison of the Zr/Fe-MOFs and Zr/Fe-MOFs/GO adsorbent with other materials on TC.
Fig. 8
Fig. 8. Kinetic model analysis of Zr/Fe-MOFs/GO (a the pseudo-first order model; b the pseudo-second order model).
Fig. 9
Fig. 9. Kinetic model analysis of Zr/Fe-MOFs (a the pseudo-first order model; b the pseudo-second order model).
Fig. 10
Fig. 10. Adsorption isotherms for tetracycline hydrochloride over Zr/Fe-MOFs and Zr/Fe-MOFs/GO (a Freundlich plots of the isotherms; b Langmuir of the isotherms).
See this image and copyright information in PMC

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