Abstract
Zeolitic imidazole frameworks (ZIFs), a new adsorbent with a high chemical and thermal stability and a high adsorption capacity, are used for adsorptive removal of azo dyes. The synthesized ZIF-67 was characterized with Fourier transform infrared spectroscopy (FTIR), thermogravimetric–differential thermal analysis (TG–DTA) and zeta potential instrument. The adsorption of some azo dyes on ZIF-67 in the single dye systems showed that the removal efficiencies are congo red > methyl orange > methyl red > methyl blue. The highest adsorption capacity of congo red and methyl orange were 3900 and 1340 mg/g, respectively. In a binary dye system the adsorption capacity of congo red decreased, while the removal efficiency of methyl orange increased in comparison with the single systems, indicating that a competitive adsorption of congo red and methyl orange over the ZIF-67 occurred. The experimental data indicate that the electrostatic attraction between ZIF-67 and congo red is the major driving force and the π–π stacking is also responsible for dye adsorption. After 5 cycles of ZIF-67 adsorption and desorption, the congo red removal efficiency maintained more than 95%.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 50878138). We thank our colleagues and other students who participated in this work.
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Highlights
• Adsorption capacities of ZIF-67 on congo red and methyl orange are 3900 and 1340 mg/g, respectively.
• Adsorption ability of the dyes over ZIF-67 is related to the dye structure and the surface property of ZIF-67.
• Competitive ability of congo red adsorption over ZIF-67 is stronger than that of methyl orange.
• Electrostatic attraction between ZIF-67 and congo red is the major adsorption driving force.
• Removal efficiency of congo red and methyl orange almost unchanged after 5 cycles
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Zhang, Zh., Zhang, Jl., Liu, Jm. et al. Selective and Competitive Adsorption of Azo Dyes on the Metal–Organic Framework ZIF-67. Water Air Soil Pollut 227, 471 (2016). https://doi.org/10.1007/s11270-016-3166-7
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DOI: https://doi.org/10.1007/s11270-016-3166-7