PMID- 24779765
OWN - NLM
STAT- MEDLINE
DCOM- 20141106
LR  - 20181202
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Linking)
VI  - 48
IP  - 10
DP  - 2014 May 20
TI  - Efficient peroxydisulfate activation process not relying on sulfate radical 
      generation for water pollutant degradation.
PG  - 5868-75
LID - 10.1021/es501218f [doi]
AB  - Peroxydisulfate (PDS) is an appealing oxidant for contaminated groundwater and 
      toxic industrial wastewaters. Activation of PDS is necessary for application 
      because of its low reactivity. Present activation processes always generate 
      sulfate radicals as actual oxidants which unselectively oxidize organics and 
      halide anions reducing oxidation capacity of PDS and producing toxic halogenated 
      products. Here we report that copper oxide (CuO) can efficiently activate PDS 
      under mild conditions without producing sulfate radicals. The PDS/CuO coupled 
      process is most efficient at neutral pH for decomposing a model compound, 
      2,4-dichlorophenol (2,4-DCP). In a continuous-flow reaction with an empty-bed 
      contact time of 0.55 min, over 90% of 2,4-DCP (initially 20 muM) and 90% of 
      adsorbable organic chlorine (AOCl) can be removed at the PDS/2,4-DCP molar ratio 
      of 1 and 4, respectively. Based on kinetic study and surface characterization, 
      PDS is proposed to be first activated by CuO through outer-sphere interaction, 
      the rate-limiting step, followed by a rapid reaction with 2,4-DCP present in the 
      solution. In the presence of ubiquitous chloride ions in groundwater/industrial 
      wastewater, the PDS/CuO oxidation shows significant advantages over sulfate 
      radical oxidation by achieving much higher 2,4-DCP degradation capacity and 
      avoiding the formation of highly chlorinated degradation products. This work 
      provides a new way of PDS activation for contaminant removal.
FAU - Zhang, Tao
AU  - Zhang T
AD  - Water Desalination and Reuse Center, King Abdullah University of Science and 
      Technology , Thuwal 4700, Makkah, Kingdom of Saudi Arabia.
FAU - Chen, Yin
AU  - Chen Y
FAU - Wang, Yuru
AU  - Wang Y
FAU - Le Roux, Julien
AU  - Le Roux J
FAU - Yang, Yang
AU  - Yang Y
FAU - Croue, Jean-Philippe
AU  - Croue JP
LA  - eng
PT  - Journal Article
DEP - 20140506
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Chlorides)
RN  - 0 (Chlorophenols)
RN  - 0 (Solutions)
RN  - 0 (Sulfates)
RN  - 0 (Water Pollutants)
RN  - 0 (sulfate radical)
RN  - 1327-41-9 (aluminum oxychloride)
RN  - 3K9958V90M (Ethanol)
RN  - 5QB0T2IUN0 (Aluminum Hydroxide)
RN  - 789U1901C5 (Copper)
RN  - R669TG1950 (2,4-dichlorophenol)
RN  - T8BEA5064F (cuprous oxide)
SB  - IM
MH  - Aluminum Hydroxide/chemistry
MH  - Chlorides/chemistry
MH  - Chlorophenols/chemistry
MH  - Copper/chemistry
MH  - Ethanol/chemistry
MH  - Hydrogen-Ion Concentration
MH  - Kinetics
MH  - Osmolar Concentration
MH  - Oxidation-Reduction
MH  - Rheology
MH  - Solutions
MH  - Sulfates/*chemistry
MH  - Temperature
MH  - Water Pollutants/*chemistry
EDAT- 2014/05/02 06:00
MHDA- 2014/11/07 06:00
CRDT- 2014/05/01 06:00
PHST- 2014/05/01 06:00 [entrez]
PHST- 2014/05/02 06:00 [pubmed]
PHST- 2014/11/07 06:00 [medline]
AID - 10.1021/es501218f [doi]
PST - ppublish
SO  - Environ Sci Technol. 2014 May 20;48(10):5868-75. doi: 10.1021/es501218f. Epub 
      2014 May 6.