High effective adsorption/removal of illegal food dyes from contaminated aqueous solution by Zr-MOFs (UiO-67). (15th July 2018)

• Record Type: Journal Article
• Authors: Yang, Qingfeng; Wang, Yue; Wang, Jing; Liu, Fangbing; Hu, Na; Pei, Hanna; Yang, Weixia; Li, Zhonghong; Suo, Yourui; Wang, Jianlong
• Is Part Of: Food chemistry. Volume 254(2018)
• Page Start: 241
• Page End: 248
• Publication Date: 2018-07-15
• Subjects: Metal organic framework -- High-adsorption capacity -- Illegal food dyes -- Aqueous drinks -- Recycle; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2018.02.011
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: UiO-67 has been applied in adsorption and removal of illegal food dyes for the first time. The adsorption capacity of CR and MG on UiO-67 is higher than that of the most reported adsorbents. The Zr-based UiO-67 also exhibits high adsorption capacity for CR in the practical application. 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, 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.