DOI: 10.1016/j.watres.2017.10.018
Scopus记录号: 2-s2.0-85033232156
论文题名: Electrochemical activation of persulfates at BDD anode: Radical or nonradical oxidation?
作者: Song H. ; Yan L. ; Jiang J. ; Ma J. ; Zhang Z. ; Zhang J. ; Liu P. ; Yang T.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 128 起始页码: 393
结束页码: 401
语种: 英语
英文关键词: BDD anode
; Electrochemical activation of persulfates
; Nonradical oxidation
; Surface-adsorbed HO[rad]
Scopus关键词: Boolean functions
; Chemical activation
; Chronoamperometry
; Cyclic voltammetry
; Dissolved oxygen
; Electrolysis
; Free radical reactions
; Oxidation
; Activated persulfate
; Advanced Oxidation Processes
; BDD anodes
; Boron-doped diamond anodes
; Direct electron transfer
; Electrochemical activation
; Electrolysis process
; Transformation products
; Anodes
; boron derivative
; carbamazepine
; diamond
; dissolved oxygen
; hydroxyl radical
; scavenger
; sulfate
; atrazine
; benzoic acid
; boron
; diamond
; organic compound
; oxygen
; peroxide
; peroxymonosulfate
; concentration (composition)
; diamond
; dissolved oxygen
; electrochemical method
; electrode
; electrokinesis
; hydroxyl radical
; oxidation
; scavenging (chemistry)
; sulfate
; transformation
; Article
; concentration at steady-state
; cyclic potentiometry
; degradation
; dissociation
; electrochemical analysis
; electrolysis
; electron transport
; oxidation
; oxygen evolution
; priority journal
; surface property
; chemistry
; electrode
; evaluation study
; oxidation reduction reaction
; water pollutant
; Atrazine
; Benzoic Acid
; Boron
; Carbamazepine
; Diamond
; Electrochemical Techniques
; Electrodes
; Electrolysis
; Hydroxyl Radical
; Organic Chemicals
; Oxidation-Reduction
; Oxygen
; Peroxides
; Water Pollutants, Chemical
英文摘要: The combination of persulfates (peroxydisulfate (PDS) and peroxymonosulfate (PMS)) and electrolysis using boron-doped diamond (BDD) anode is a promising green advanced oxidation process. In comparison with electrolysis alone, electrochemical activation of persulfates at BDD anode considerably enhanced the degradation of carbamazepine (CBZ). The experimental results indicate that the surface-adsorbed hydroxyl radical (HO[rad]) played the dominant role. The generally proposed nonradical oxidation mechanism ignored hydroxyl radical (HO[rad]) oxidation because low concentration of radical scavenger (<10 M methanol or 5 M tertbutanol) could not effectively scavenge the surface-adsorbed HO[rad]. The quasi steady-state concentration of HO[rad] was estimated to be about 5.0–9.1 × 10−12 M for electrolysis with BDD anode, and it was increased to 1.1–1.6 × 10−11 M and 3.2–5.0 × 10−11 M for addition of 5 mM PDS and PMS, respectively. The results of cyclic voltammetry (CV) and chronoamperometry as well as evolution of dissolved oxygen (DO) reveal that the electrochemically activated persulfates molecule (PDS∗/PMS∗) promoted the production of HO[rad] via water dissociation at BDD anode and enhanced the direct electron transfer (DET) reaction, which otherwise inhibited the oxygen evolution side reaction. Therefore, higher current efficiency was achieved in electrochemical activation of persulfates process compared with electrolysis process. Additionally, the transformation products of CBZ were also investigated and their formation pathways were proposed. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113139
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China
Recommended Citation:
Song H.,Yan L.,Jiang J.,et al. Electrochemical activation of persulfates at BDD anode: Radical or nonradical oxidation?[J]. Water Research,2018-01-01,128