Efficient peroxydisulfate activation process not relying on sulfate radical generation for water pollutant degradation
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Water Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Imaging and Characterization Core Lab
Advanced Nanofabrication, Imaging and Characterization Core Lab
Water Desalination & Reuse Research Cntr
Permanent link to this recordhttp://hdl.handle.net/10754/563554
MetadataShow full item record
AbstractPeroxydisulfate (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 μM) 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. © 2014 American Chemical Society.
PublisherAmerican Chemical Society (ACS)
- Comparison of UV/hydrogen peroxide and UV/peroxydisulfate processes for the degradation of humic acid in the presence of halide ions.
- Authors: Lou X, Xiao D, Fang C, Wang Z, Liu J, Guo Y, Lu S
- Issue date: 2016 Mar
- [Sodium peroxydisulfate activation by heat and Fe(II) for the degradation of 4-CP].
- Authors: Zhao JY, Zhang YB, Quan X, Zhao YZ
- Issue date: 2010 May
- Significantly enhanced base activation of peroxymonosulfate by polyphosphates: Kinetics and mechanism.
- Authors: Lou X, Fang C, Geng Z, Jin Y, Xiao D, Wang Z, Liu J, Guo Y
- Issue date: 2017 Apr
- The activity and selectivity of catalytic peroxide oxidation of chlorophenols over Cu-Al hydrotalcite/clay composite.
- Authors: Zhou S, Gu C, Qian Z, Xu J, Xia C
- Issue date: 2011 May 15
- Electrochemical activation of sulfate by BDD anode in basic medium for efficient removal of organic pollutants.
- Authors: Chen L, Lei C, Li Z, Yang B, Zhang X, Lei L
- Issue date: 2018 Nov