PMID- 28117980
OWN - NLM
STAT- MEDLINE
DCOM- 20170609
LR  - 20180925
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Linking)
VI  - 51
IP  - 4
DP  - 2017 Feb 21
TI  - In Situ Photochemical Activation of Sulfate for Enhanced Degradation of Organic 
      Pollutants in Water.
PG  - 2339-2346
LID - 10.1021/acs.est.6b05090 [doi]
AB  - The advanced oxidation process (AOP) based on SO(4)(*-) radicals has been 
      receiving growing attention in water and wastewater treatment. Producing 
      SO(4)(*-) radicals by activation of peroxymonosulfate or persulfate faces the 
      challenges of high operational cost and potential secondary pollution. In this 
      study, we report the in situ photochemical activation of sulfate (i-PCAS) to 
      produce SO(4)(*-) radicals with bismuth phosphate (BPO) serving as photocatalyst. 
      The prepared BPO rod-like material could achieve remarkably enhanced degradation 
      of 2,4-dichlorophenol (2,4-DCP) in the presence of sulfate, indicated by the 
      first-order kinetic constant (k = 0.0402 min(-1)) being approximately 2.1 times 
      that in the absence (k = 0.019 min(-1)) at pH-neutral condition. This presented a 
      marked contrast with commercial TiO(2) (P25), the performance of which was always 
      inhibited by sulfate. The impact of radical scavenger and electrolyte, combined 
      with electron spin resonance (ESR) measurement, verified the formation of *OH and 
      SO(4)(*-) radicals during i-PCAS process. According to theoretical calculations, 
      BPO has a sufficiently high valence band potential making it thermodynamically 
      favorable for sulfate oxidation, and weaker interaction with SO(4)(*-) radicals 
      resulting in higher reactivity toward target organic pollutant. The concept of 
      i-PCAS appears to be attractive for creating new photochemical systems where in 
      situ production of SO(4)(*-) radicals can be realized by using sulfate originally 
      existing in aqueous environment. This eliminates the need for extrinsic chemicals 
      and pH adjustment, which makes water treatment much easier, more economical, and 
      more sustainable.
FAU - Liu, Guoshuai
AU  - Liu G
AD  - State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of 
      Technology , Harbin 150090, P. R. China.
FAU - You, Shijie
AU  - You S
AUID- ORCID: 0000-0001-8178-9418
AD  - State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of 
      Technology , Harbin 150090, P. R. China.
FAU - Tan, Yang
AU  - Tan Y
AD  - State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of 
      Technology , Harbin 150090, P. R. China.
FAU - Ren, Nanqi
AU  - Ren N
AD  - State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of 
      Technology , Harbin 150090, P. R. China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20170206
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Sulfates)
RN  - 0 (Water Pollutants, Chemical)
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - Hydrogen-Ion Concentration
MH  - Oxidation-Reduction
MH  - Sulfates
MH  - *Water
MH  - *Water Pollutants, Chemical
MH  - Water Purification
EDAT- 2017/01/25 06:00
MHDA- 2017/06/10 06:00
CRDT- 2017/01/25 06:00
PHST- 2017/01/25 06:00 [pubmed]
PHST- 2017/06/10 06:00 [medline]
PHST- 2017/01/25 06:00 [entrez]
AID - 10.1021/acs.est.6b05090 [doi]
PST - ppublish
SO  - Environ Sci Technol. 2017 Feb 21;51(4):2339-2346. doi: 10.1021/acs.est.6b05090. 
      Epub 2017 Feb 6.