PMID- 37178952
OWN - NLM
STAT- MEDLINE
DCOM- 20230601
LR  - 20230601
IS  - 1873-6424 (Electronic)
IS  - 0269-7491 (Linking)
VI  - 330
DP  - 2023 Aug 1
TI  - The critical impacts of pyrochar during 2,4,6-trichlorophenol photochemical 
      remediation process: Cooperation between persistent free radicals and oxygenated 
      functional groups.
PG  - 121813
LID - S0269-7491(23)00815-1 [pii]
LID - 10.1016/j.envpol.2023.121813 [doi]
AB  - The widespread use of polychlorophenols poses enormous environmental challenges. 
      Biochar has the potential to accelerate the transformation of polychlorophenols. 
      But the biochar-triggered photochemical decomposition mechanism of 
      polychlorophenols still remains unclear. Herein, the photochemical behavior of 
      pyrochar was comprehensively investigated in 2,4,6-trichlorophenol (TCP) 
      remediation. Researches revealed that persistent free radicals (PFRs) and 
      oxygenated functional groups (OFGs) on the surface of pyrochar cooperatively 
      promoted ROS generation for TCP degradation. PFRs performed a key role of 
      electron-donating and energy transfer in ROS conversion, especially in the 
      activation of H(2)O(2) into *OH. The hydroxyl groups of photosensitive components 
      of pyrochar were photo-excited and provided electrons for enhanced ROS formation 
      as well. With photogenerated ROS involved, more TCP was decomposed through 
      dechlorination under light irradiation than that in the dark, in which (1)O(2), 
      *OH, and *O(2)(-) were the dominant active species. During this process, stronger 
      light intensities (3 W/m(2)) and shorter light wavelengths (400 nm) can provide 
      more energy for the activation of PFRs and OFGs, promoting the decomposition of 
      TCP. This work casts a new light on the environmental roles of pyrochar in the 
      photochemical removal of polychlorophenol pollutants.
CI  - Copyright (c) 2023 Elsevier Ltd. All rights reserved.
FAU - Liu, Lu
AU  - Liu L
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.
FAU - Wang, Jian
AU  - Wang J
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.
FAU - Yang, Huijuan
AU  - Yang H
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.
FAU - Gao, Di
AU  - Gao D
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.
FAU - Cui, Yaya
AU  - Cui Y
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.
FAU - Chen, Hao
AU  - Chen H
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.
FAU - Qin, Yaxin
AU  - Qin Y
AD  - School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, 
      Wuhan, 430205, PR China.
FAU - Ye, Ranfeng
AU  - Ye R
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China. 
      Electronic address: ranfeng.ye@mail.hzau.edu.cn.
FAU - Ding, Xing
AU  - Ding X
AD  - College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China. 
      Electronic address: dingx@mail.hzau.edu.cn.
LA  - eng
PT  - Journal Article
DEP - 20230511
PL  - England
TA  - Environ Pollut
JT  - Environmental pollution (Barking, Essex : 1987)
JID - 8804476
RN  - 0 (biochar)
RN  - 0 (Reactive Oxygen Species)
RN  - MHS8C5BAUZ (2,4,6-trichlorophenol)
RN  - BBX060AN9V (Hydrogen Peroxide)
RN  - 16291-96-6 (Charcoal)
RN  - 0 (Free Radicals)
SB  - IM
MH  - Reactive Oxygen Species
MH  - *Hydrogen Peroxide/chemistry
MH  - *Charcoal/chemistry
MH  - Free Radicals/chemistry
OTO - NOTNLM
OT  - 2,4,6-Trichlorophenol
OT  - Biochar
OT  - Oxygenated functional groups
OT  - Persistent free radicals
OT  - Pyrochar
OT  - Reactive oxygen species
COIS- Declaration of competing interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2023/05/14 01:07
MHDA- 2023/06/01 06:42
CRDT- 2023/05/13 19:28
PHST- 2023/03/07 00:00 [received]
PHST- 2023/05/10 00:00 [revised]
PHST- 2023/05/11 00:00 [accepted]
PHST- 2023/06/01 06:42 [medline]
PHST- 2023/05/14 01:07 [pubmed]
PHST- 2023/05/13 19:28 [entrez]
AID - S0269-7491(23)00815-1 [pii]
AID - 10.1016/j.envpol.2023.121813 [doi]
PST - ppublish
SO  - Environ Pollut. 2023 Aug 1;330:121813. doi: 10.1016/j.envpol.2023.121813. Epub 
      2023 May 11.