DOI: 10.1016/j.watres.2017.10.045
Scopus记录号: 2-s2.0-85032260622
论文题名: Efficient catalytic As(III) oxidation on the surface of ferrihydrite in the presence of aqueous Mn(II)
作者: Lan S. ; Ying H. ; Wang X. ; Liu F. ; Tan W. ; Huang Q. ; Zhang J. ; Feng X.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 128 起始页码: 92
结束页码: 101
语种: 英语
英文关键词: As(III) oxidation
; As(V) adsorption
; Catalytic oxidation
; Ferrihydrite
; Mn(II) oxidation
; Mn(III) intermediate
Scopus关键词: Electron transitions
; Essential oils
; Fourier transform infrared spectroscopy
; Indium compounds
; Iron oxides
; Oxidation
; pH effects
; Reaction intermediates
; X ray absorption spectroscopy
; As oxidation(III)
; Attenuated total reflectance Fourier transform infrared spectroscopy
; Contaminant remediation
; Electron transfer mechanisms
; Ferrihydrites
; Mn oxidation
; Spectroscopic technique
; X-ray absorption near edge spectroscopy
; Catalytic oxidation
; ferric hydroxide
; iron oxide
; manganese
; arsenic trioxide
; arsenous acid derivative
; ferric ion
; ferric oxyhydroxide
; manganese
; absorption
; aquatic environment
; aqueous solution
; arsenic
; catalysis
; catalyst
; electron
; ferrihydrite
; manganese
; oxidation
; reaction kinetics
; speciation (chemistry)
; toxicity
; adsorption
; aqueous solution
; Article
; bioremediation
; catalysis
; comparative study
; concentration (parameters)
; controlled study
; electron transport
; infrared spectroscopy
; near infrared reflectance spectroscopy
; oxidation
; oxidation reduction reaction
; pH
; priority journal
; recycling
; surface property
; synthesis
; X ray absorption spectroscopy
; chemistry
; pollutant
; Adsorption
; Arsenites
; Catalysis
; Environmental Pollutants
; Ferric Compounds
; Manganese
; Oxidation-Reduction
; Spectroscopy, Fourier Transform Infrared
; X-Ray Absorption Spectroscopy
英文摘要: Arsenic is a carcinogenic element that exists primarily as arsenate [As(V)] and arsenite [As(III)] in the nature environment, with As(III) being more toxic and mobile of the two species. In addition, ferrihydrite, which is widely distributed in soils and aquatic environments, can catalyze the oxidation of Mn(II) and accelerate the formation of high-valence Mn, which can significantly influence the speciation, toxicity, and mobility of As when these species co-exist. In this context, we herein explored the mechanism of As(III) oxidation in the presence of ferrihydrite and Mn(II) using a kinetic approach combined with multiple spectroscopic techniques, including X-ray absorption near edge spectroscopy, in situ horizontal attenuated total-reflectance Fourier transform infrared spectroscopy, and in situ quick scanning X-ray absorption spectroscopy. Our results indicate that efficient As(III) oxidation by dissolved O2 occurs on the surface of ferrihydrite in the presence of aqueous Mn(II). Compared with As(III) oxidation in the presence of ferrihydrite and Mn oxides (i.e., Mn oxides/hydroxides), the degree of As(III) oxidation in the ferrihydrite-Mn(II) system was significantly higher, and the majority of generated As(V) was adsorbed on the mineral (i.e., ferrihydrite) surface. Furthermore, As(III) oxidation was enhanced upon increasing both the molar ratio of Mn(II)/As(III) and the solution pH. The greater As(III) oxidation by O2 in the ferrihydrite-Mn(II) system was mainly attributed to the formation of a strong oxidant of the instantaneous intermediate Mn(III) species via Mn(II) oxidation under catalysis by the ferrihydrite surface. Moreover, As(III) oxidation occurred mainly on the ferrihydrite surface and was accompanied by the regeneration of Mn(II), thereby rendering it recyclable. These results therefore provide new insights into the mechanism of As(III) oxidation on the surfaces of Fe oxides (i.e., Fe oxides/hydroxides) in the presence of aqueous Mn(II) as well as the new details regarding the electron transfer mechanisms between the As(III)-Mn(II, III)-O2 species at the ferrihydrite surface, and could lead to novel approaches for As(III) contaminant remediation in the environment. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113154
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River) Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039, China
Recommended Citation:
Lan S.,Ying H.,Wang X.,et al. Efficient catalytic As(III) oxidation on the surface of ferrihydrite in the presence of aqueous Mn(II)[J]. Water Research,2018-01-01,128