PMID- 34467952
OWN - NLM
STAT- MEDLINE
DCOM- 20210909
LR  - 20210909
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 283
DP  - 2021 Nov
TI  - Activation of peroxydisulfate by carbon nanotube for the degradation of 
      2,4-dichlorophenol: Contributions of surface-bound radicals and direct electron 
      transfer.
PG  - 131282
LID - S0045-6535(21)01754-9 [pii]
LID - 10.1016/j.chemosphere.2021.131282 [doi]
AB  - Carbon materials have been used to activate peroxydisulfate (PDS) for the 
      degradation of organic pollutants. The mechanism involved, especially whether 
      radicals are formed in these processes, is still under debate. In this research, 
      multi-walled carbon nanotube (MWCNT) was employed to activate PDS for the removal 
      of 2,4-dichlorophenol (2,4-DCP). The effects of solution pH, PDS concentration, 
      2,4-DCP concentration, and MWCNT loading on the degradation of 2,4-DCP were 
      investigated. The mechanism was explored via radical scavenging experiments, 
      electron paramagnetic resonance (EPR) and MWCNT surface characterization. The 
      results showed that the rate of 2,4-DCP degradation increased with the increasing 
      solution pH, PDS concentration and MWCNT loading. The presence of OH and SO(4)(-) 
      signals in EPR studies, no inhibitory effect in radical scavenging experiments, 
      and the chlorination of MWCNT observed by X-ray photoelectron spectroscopy (XPS) 
      suggested that surface reactions involving both surface-bound radicals and direct 
      electron transfer were responsible for 2,4-DCP degradation. Reusability tests 
      showed that the surface sites responsible for surface-bound radical formation 
      were poisoned after PDS activation, while those responsible for direct electron 
      transfer remained active after five cycles. This research provided the first 
      in-depth insights for the dual roles of MWCNT in the PDS activation process.
CI  - Copyright (c) 2021 Elsevier Ltd. All rights reserved.
FAU - Chen, Chien-Yu
AU  - Chen CY
AD  - Graduate Institute of Environmental Engineering, National Taiwan University, No. 
      1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan.
FAU - Cho, Yi-Chin
AU  - Cho YC
AD  - Graduate Institute of Environmental Engineering, National Taiwan University, No. 
      1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan.
FAU - Lin, Yi-Pin
AU  - Lin YP
AD  - Graduate Institute of Environmental Engineering, National Taiwan University, No. 
      1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan; NTU Research Center for Future 
      Earth, National Taiwan University, Taipei, Taiwan. Electronic address: 
      yipinlin@ntu.edu.tw.
LA  - eng
PT  - Journal Article
DEP - 20210622
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Chlorophenols)
RN  - 0 (Nanotubes, Carbon)
RN  - R669TG1950 (2,4-dichlorophenol)
SB  - IM
MH  - *Chlorophenols
MH  - Electrons
MH  - *Nanotubes, Carbon
MH  - Oxidation-Reduction
OTO - NOTNLM
OT  - Electron transfer
OT  - Hydroxyl radical
OT  - Multi-walled carbon nanotube
OT  - Persulfate
OT  - Sulfate radical
EDAT- 2021/09/02 06:00
MHDA- 2021/09/10 06:00
CRDT- 2021/09/01 08:43
PHST- 2021/03/14 00:00 [received]
PHST- 2021/05/24 00:00 [revised]
PHST- 2021/06/16 00:00 [accepted]
PHST- 2021/09/02 06:00 [pubmed]
PHST- 2021/09/10 06:00 [medline]
PHST- 2021/09/01 08:43 [entrez]
AID - S0045-6535(21)01754-9 [pii]
AID - 10.1016/j.chemosphere.2021.131282 [doi]
PST - ppublish
SO  - Chemosphere. 2021 Nov;283:131282. doi: 10.1016/j.chemosphere.2021.131282. Epub 
      2021 Jun 22.