Selective and Competitive Adsorption of Azo Dyes on the Metal–Organic Framework ZIF-67

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 t...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2016-12, Vol.227 (12), p.1, Article 471
Main Authors: Zhang, Zhan-hang, Zhang, Jing-li, Liu, Jian-ming, Xiong, Zhen-hu, Chen, Xu
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Azo compounds
Azo dyes
Climate Change/Climate Change Impacts
Color removal
Competition
Differential thermal analysis
Dyes
Earth and Environmental Science
Efficiency
Electrostatics
Environment
Environmental monitoring
Experiments
Fourier transforms
Fruits
Hydrogeology
Infrared spectroscopy
Ligands
Methylene blue
Porous materials
Protons
Soil Science & Conservation
Studies
Thermal analysis
Water
Water Quality/Water Pollution
Zeta potential
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Summary: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%. Graphical Abstract The adsorption of Congo red and Methyl orange on the ZIF-67
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-016-3166-7