PMID- 30978663
OWN - NLM
STAT- MEDLINE
DCOM- 20191101
LR  - 20191101
IS  - 1879-2448 (Electronic)
IS  - 0043-1354 (Linking)
VI  - 157
DP  - 2019 Jun 15
TI  - Insights into the mechanism of nonradical reactions of persulfate activated by 
      carbon nanotubes: Activation performance and structure-function relationship.
PG  - 406-414
LID - S0043-1354(19)30297-0 [pii]
LID - 10.1016/j.watres.2019.03.096 [doi]
AB  - This study aimed to elucidate the intrinsic mechanisms of PS activation by carbon 
      nanotubes (CNTs). Singlet oxygen generation ((1)O(2)) and direct CNTs-mediated 
      electron transfer were hypothesized to be two major pathways of the oxidation of 
      2,4-dichlorophenol (2,4-DCP) by PS in the presence of both unmodified and 
      modified CNTs. For the first time, roles of CNT active sites responsible for PS 
      activation were determined using CNT derivatization and structural 
      characterization. By selectively deactivating the carbonyl, hydroxyl or 
      carboxylic groups on CNTs surface and linear sweep voltammetry (LSV) analysis, CO 
      groups were determined to be the main active sites contributing to the direct 
      electron transfer oxidation, while singlet oxygen was generated at CNTs defects. 
      Subsequent UV irradiation was shown to cause the recovery of surface defects with 
      I(D)/I(G) of CNTs increasing by 21%. This resulted in the regeneration of the 
      performance for the coupled system and allowed for multi-cycle activation of PS 
      by CNTs. These results suggest that CNTs/PS system combined with regeneration 
      based on UV irradiation can be used as an effective alternative process for 
      continuous degradation of recalcitrant aqueous contaminants through the 
      non-radical mechanism.
CI  - Copyright (c) 2019 Elsevier Ltd. All rights reserved.
FAU - Cheng, Xin
AU  - Cheng X
AD  - College of Architecture and Environment, Sichuan University, Chengdu, 610065, 
      China.
FAU - Guo, Hongguang
AU  - Guo H
AD  - College of Architecture and Environment, Sichuan University, Chengdu, 610065, 
      China; Department of Civil & Environmental Engineering, University of Washington, 
      Box 352700, Seattle, WA, 98195-2700, United States. Electronic address: 
      hgguo@scu.edu.cn.
FAU - Zhang, Yongli
AU  - Zhang Y
AD  - College of Architecture and Environment, Sichuan University, Chengdu, 610065, 
      China.
FAU - Korshin, Gregory V
AU  - Korshin GV
AD  - Department of Civil & Environmental Engineering, University of Washington, Box 
      352700, Seattle, WA, 98195-2700, United States.
FAU - Yang, Bo
AU  - Yang B
AD  - College of Architecture and Environment, Sichuan University, Chengdu, 610065, 
      China.
LA  - eng
PT  - Journal Article
DEP - 20190401
PL  - England
TA  - Water Res
JT  - Water research
JID - 0105072
RN  - 0 (Nanotubes, Carbon)
RN  - 17778-80-2 (Singlet Oxygen)
RN  - 3352-57-6 (Hydroxyl Radical)
SB  - IM
MH  - Hydroxyl Radical
MH  - *Nanotubes, Carbon
MH  - Oxidation-Reduction
MH  - Singlet Oxygen
MH  - Structure-Activity Relationship
OTO - NOTNLM
OT  - Carbon nanotubes
OT  - Electron transfer
OT  - Functional groups
OT  - Non-radical activation
OT  - Persulfate
OT  - Singlet oxygen
EDAT- 2019/04/13 06:00
MHDA- 2019/11/02 06:00
CRDT- 2019/04/13 06:00
PHST- 2019/02/20 00:00 [received]
PHST- 2019/03/30 00:00 [accepted]
PHST- 2019/04/13 06:00 [pubmed]
PHST- 2019/11/02 06:00 [medline]
PHST- 2019/04/13 06:00 [entrez]
AID - S0043-1354(19)30297-0 [pii]
AID - 10.1016/j.watres.2019.03.096 [doi]
PST - ppublish
SO  - Water Res. 2019 Jun 15;157:406-414. doi: 10.1016/j.watres.2019.03.096. Epub 2019 
      Apr 1.