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Open AccessArticle

Selective Dye Adsorption by Zeolitic Imidazolate Framework-8 Loaded UiO-66-NH2

1
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, China
2
Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China
3
Department of Physics, Henan Finance University, Zhengzhou 450046, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(9), 1283; https://doi.org/10.3390/nano9091283
Received: 5 August 2019 / Revised: 31 August 2019 / Accepted: 4 September 2019 / Published: 8 September 2019
(This article belongs to the Special Issue Nanocontainers, Nano-Adsorbents, and Their Polymer Composites)
In this study, Zeolitic Imidazolate Framework-8 (ZIF-8)-loaded UiO-66-NH2 was synthesized, characterized, and analyzed for its potential to efficiently remove dyes. The selective adsorption on ZIF-8-loaded UiO-66-NH2 or its parent MOFs (UiO-66-NH2 and ZIF-8) in the mixed dyes solution was explored, including anionic dye (methyl orange (MO)) and cationic dyes (methylene blue (MB) and rhodamine B (RhB)). ZIF-8-loaded UiO-66-NH2 displayed much better selectivity to MB than its parent MOFs. Adsorption capacity of ZIF-8-loaded UiO-66-NH2 (173 mg/g) toward MB was found to be 215% higher than UiO-66-NH2 (55 mg/g). A kinetics study based on adsorption data demonstrated that the adsorption process most closely matched with the model of pseudo-second-order kinetic and Langmuir isotherm. The adsorption was an exothermic and spontaneous physical process as revealed by the values of thermodynamic parameters. Furthermore, reusability of ZIF-8-loaded UiO-66-NH2 was investigated and revealed the significant regeneration efficiency in adsorption capacity for MB even after four adsorption cycles. Experimental results proved that the interaction between ZIF-8-loaded UiO-66-NH2 and MB was mainly affected by the mechanism, for instance, electrostatic interaction as well as π–π stacking interactions. View Full-Text
Keywords: ZIF-8; UiO-66-NH2 composites; metal-organic frameworks; selective adsorption ZIF-8; UiO-66-NH2 composites; metal-organic frameworks; selective adsorption
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MDPI and ACS Style

Zhang, H.; Shi, X.; Li, J.; Kumar, P.; Liu, B. Selective Dye Adsorption by Zeolitic Imidazolate Framework-8 Loaded UiO-66-NH2. Nanomaterials 2019, 9, 1283.

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