期刊
FOOD CHEMISTRY
卷 254, 期 -, 页码 241-248出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.02.011
关键词
Metal organic framework; High-adsorption capacity; Illegal food dyes; Aqueous drinks; Recycle
资金
- National Natural Science Foundation of China [21675127, 31371813]
- Fundamental Research Funds for the Northwest A&F University of China [2014YB093, 2452015257]
- Development Project of Qinghai Key Laboratory [2017-ZJ-Y10]
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, 120 min for contact time, and 10.0 mg L-1 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 (1236.9 mg g(-1)) and Malachite green (357.3 mg g(-1)) 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.
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