Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7585498 | Food Chemistry | 2018 | 35 Pages |
Abstract
UiO-67, a bifunctional adsorbent, was successfully applied to remove illegal food dyes (Congo red and Malachite green) from aqueous solution. The relevant adsorption conditions were optimized: pH 6, 120â¯min for contact time, and 10.0â¯mg Lâ1 adsorbent dose for Congo red. Adsorption behavior of UiO-67 exhibits a better fitting to pseudo-second-order kinetic model and Langmuir model. Moreover, the maximum adsorption capacities of Congo red (1236.9â¯mgâ¯gâ1) and Malachite green (357.3â¯mgâ¯gâ1) are higher than that of the most reported adsorbents. Thermodynamic analysis reveals that adsorption processes are spontaneous and endothermic in nature. Powder X-ray diffraction patterns, Fourier-transform infrared spectra and the X-ray photoelectron spectroscopy analysis indicates Zr-OH groups have positive influence on binding of target molecules. What's more, UiO-67 could be reused without significant loss of its capacity after seven cycles. These results prefigure the promising potentials of UiO-67 in food safety risk management.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Qingfeng Yang, Yue Wang, Jing Wang, Fangbing Liu, Na Hu, Hanna Pei, Weixia Yang, Zhonghong Li, Yourui Suo, Jianlong Wang,