title: Quinone-modified NH2-MIL-101(Fe) composite as a redox mediator for improved degradation of bisphenol A.
abstract: A novel quinone-modified metal-organic frameworks NH2-MIL-101(Fe) was synthesized using a simple chemical method under mild condition. The introduced 2-anthraquinone sulfonate (AQS) can be covalently modified with NH2-MIL-101(Fe) and acts as a redox mediator to enhance the degradation of bisphenol A (BPA) via persulfate activation. The obtained AQS-NH-MIL-101(Fe) was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectra, cyclic voltammetry and electrochemical impedance spectroscopy. AQS-NH-MIL-101(Fe) exhibited better catalytic performance compared with NH2-MIL-101(Fe) and NH2-MIL-101(Fe) with free AQS (NH2-MIL-101(Fe)/AQS). That is, AQS-NH-MIL-101(Fe) was proved to be the most effective in that more than 97.7% of BPA was removed. The degradation rate constants (k) of AQS-NH-MIL-101(Fe) was 9-fold higher than that of NH2-MIL-101(Fe) and 7-fold higher than NH2-MIL-101(Fe)/AQS, indicating that AQS is a great electron-transfer mediator when modified with NH2-MIL-101(Fe). Based on the above results, the possible mechanism of catalytic reaction has been investigated in view of the trapping experiments. In addition, the AQS-NH-MIL-101(Fe) catalyst exhibited excellent stability and can be used several times without significant deterioration in performance.
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan, ShanDong Province, China. Electronic address: 18766106007@163.com.
authors.forename: Xianghui
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan, ShanDong Province, China. Electronic address: chm_guowl@ujn.edu.cn.
authors.forename: Weilin
authors.initials: W
authors.lastname: Guo
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan, ShanDong Province, China. Electronic address: 1570938820@qq.com.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan, ShanDong Province, China. Electronic address: 583548444@qq.com.
authors.forename: Ruiqin
authors.initials: R
authors.lastname: Wang
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan, ShanDong Province, China. Electronic address: 1942375369@qq.com.
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
keywords: 2-Anthraquinone sulfonate; BPA degradation; Catalyst; Metal-organic frameworks; Redox mediator