DOI: 10.1016/j.watres.2018.11.067
Scopus记录号: 2-s2.0-85057623665
论文题名: Degradation of bromate by Fe(II)–Ti(IV) layered double hydroxides nanoparticles under ultraviolet light
作者: Xiao Q. ; Yu S. ; Li L. ; Zhang Y. ; Yi P.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 310
结束页码: 320
语种: 英语
英文关键词: Alcohols addition
; Bromate removal
; Reductive species
; Tap water
; UV/layered double hydroxides system
Scopus关键词: Atoms
; Efficiency
; Magnetic separation
; Potable water
; Rate constants
; Reusability
; Titanium dioxide
; Water treatment
; Bromate removals
; Double hydroxides
; Layered double hydroxides
; Photocatalytic decomposition
; Photocatalytic reduction
; Reductive species
; Tap water
; Ultraviolet disinfections
; Iron compounds
; alcohol
; alcohol derivative
; bromate
; bromine
; dissolved oxygen
; hydroxide
; iron
; lactate dehydrogenase
; methanol
; nanoparticle
; nitrate
; nitrite
; titanium
; alcohol
; catalyst
; decomposition
; disinfection
; efficiency measurement
; hydroxide
; iron
; nanoparticle
; photodegradation
; reduction
; titanium
; ultraviolet radiation
; water treatment plant
; adsorption
; Article
; degradation kinetics
; Fourier transform infrared spectroscopy
; magnetic separation
; particle size
; pH
; photocatalysis
; photodegradation
; photoluminescence
; priority journal
; transmission electron microscopy
; ultraviolet radiation
; water treatment
; X ray diffraction
英文摘要: The photocatalytic decomposition of bromate (BrO 3 − ), a possible human carcinogen, has attracted much attention because of its high efficiency and easier combination with ultraviolet (UV) disinfection in water treatment plants. In this study, the Fe(II)–Ti(IV) layered double hydroxides (LDHs) have been made through a facile hydrothermal method and used as an alternative photocatalyst for reduction of BrO 3 − . LDHs prepared at a Fe/Ti molar ratio of ∼0.5 and pH 7.0, denoted as Fe–Ti-0.5 (pH 7.0), exhibited the highest BrO 3 − removal efficiency (removal rate constant = 0.067 ± 0.002 min −1 ) compared to commercial TiO 2 and the LDHs prepared at different pHs or different Fe/Ti ratios. The presence of alcohols in water enhanced the photocatalytic reduction of BrO 3 − due to the greater abundance of electrons caused by alcohols effectively reacting with holes. The neutral pH also favors the degradation of BrO 3 − . However, the presence of nitrate and nitrite can inhibit the degradation process, due to their reactions with hydrated electrons (e aq − ) and hydrogen atom radicals (H∙). Cyclic degradation runs and magnetic separation techniques demonstrated the superior reusability of the Fe–Ti-0.5 (pH 7.0) LDH for BrO 3 − removal. The removal rate of BrO 3 − under UV was higher than that without UV, indicating that the decomposition proceeded primarily via a photo-reductive mechanism induced by e aq − and H∙ and thus degradation pathways are proposed. Moreover, when tested in tap water, greater than 90% of BrO 3 − was removed after 60 min reaction in UV/Fe–Ti-0.5 (pH 7.0) LDH systems in the presence of 5‰ (v/v) methanol. This demonstrates the high potential for such systems for removing BrO 3 − from disinfected drinking water. This work may shed lights on the design of effective photocatalysts for the enhanced degradation of BrO 3 − in water plants and the influence of constituents in raw water on the treatment. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122092
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; Department of Civil, Environmental and Geomatics Engineering, Florida Atlantic University, Boca Raton, FL 33431-6496, United States
Recommended Citation:
Xiao Q.,Yu S.,Li L.,et al. Degradation of bromate by Fe(II)–Ti(IV) layered double hydroxides nanoparticles under ultraviolet light[J]. Water Research,2019-01-01