标题：Amorphous Fe78Si9B13 alloy: An efficient and reusable photo-enhanced Fenton-like catalyst in degradation of cibacron brilliant red 3B-A dye under UV-vis light
作者：Jia, Z.; Zhang, W. C.; Wang, W. M.; Habibi, D.; Zhang, L. C.
作者机构：[Jia, Z.; Habibi, D.; Zhang, L. C.] Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia.; [Zhang, W. C.] Environm Protect Adm Ji 更多
通讯作者地址：[Zhang, LC]Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia.
来源：APPLIED CATALYSIS B-ENVIRONMENTAL
关键词：Catalyst; Amorphous Fe78Si9B13 alloy; Photo-enhanced; Reaction kinetics
摘要：The development of new functional applications of amorphous alloy is an active and challenging topic. In this work, amorphous Fe78Si9B13 alloy, a photo-enhanced Fenton-like catalyst, exhibits excellent functional ability in degrading an azo dye. This study reports the dramatic performance gains achieved for photo-enhanced Fenton-like degradation of cibacron brilliant red 3B-A (BR3B-A) dye aqueous solutions, the reusability of amorphous Fe78Si9B13 alloy ribbon catalysts, and the reaction kinetics (k) of the process. The individual and synthetical effects of the various reaction parameters are investigated by employing an orthogonal matrix (L-16(4(5))) experimental methodology. The investigation evaluates the impact of these parameters on the degradation process, in order to demonstrate that UV-vis light could continuously induce hydroxyl radicals ((OH)-O-center dot) to be generated in the dye aqueous solution and significantly enhance the rate of dye degradation and mineralization. The experimental results show that nearly 100% color removal is achieved within 5 min under conditions of 2.0 Fe78Si9B13 ribbons, 0.5 M H2O2 and pH 2. UV-vis light intensity ranging from 0 to 7.7 mu W/cm(2) enhances a dramatic improvement in color removal from 78% at 200 min to 98% at 60 min and an improvement in the reaction kinetics (k) from 0.0413 at 0 mu W/cm(2) of light irradiation to 0.2901 at 7.7 mu W/cm(2) of light irradiation under conditions of 2.0 g/L Fe78Si9B13 ribbons, 0.5 M H2O2 and natural pH 6.45. The production of (OH)-O-center dot is investigated by adding tertiary butanol, resulting in a sharp decrease of dye color removal. Structural characterizations of as-received amorphous Fe78Si9B13 ribbons and of recycled Fe78Si9B13 ribbons are also investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectrophotometers (UV-vis DRS), scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS); the results reveal a slight decay of the reused Fe78Si9B13 ribbons, along with a gradual precipitation of crystallized alpha-Fe, iron oxide and SiO2 on the ribbon surface over the few cycles of usage. (C) 2016 Elsevier B.V. All rights reserved.