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Efficient peroxydisulfate activation process not relying on sulfate radical generation for water pollutant degradation.
Environ Sci Technol. 2014 May 20; 48(10):5868-75.ES

Abstract

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 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.

Authors+Show Affiliations

Water Desalination and Reuse Center, King Abdullah University of Science and Technology , Thuwal 4700, Makkah, Kingdom of Saudi Arabia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24779765

Citation

Zhang, Tao, et al. "Efficient Peroxydisulfate Activation Process Not Relying On Sulfate Radical Generation for Water Pollutant Degradation." Environmental Science & Technology, vol. 48, no. 10, 2014, pp. 5868-75.
Zhang T, Chen Y, Wang Y, et al. Efficient peroxydisulfate activation process not relying on sulfate radical generation for water pollutant degradation. Environ Sci Technol. 2014;48(10):5868-75.
Zhang, T., Chen, Y., Wang, Y., Le Roux, J., Yang, Y., & Croué, J. P. (2014). Efficient peroxydisulfate activation process not relying on sulfate radical generation for water pollutant degradation. Environmental Science & Technology, 48(10), 5868-75. https://doi.org/10.1021/es501218f
Zhang T, et al. Efficient Peroxydisulfate Activation Process Not Relying On Sulfate Radical Generation for Water Pollutant Degradation. Environ Sci Technol. 2014 May 20;48(10):5868-75. PubMed PMID: 24779765.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Efficient peroxydisulfate activation process not relying on sulfate radical generation for water pollutant degradation. AU - Zhang,Tao, AU - Chen,Yin, AU - Wang,Yuru, AU - Le Roux,Julien, AU - Yang,Yang, AU - Croué,Jean-Philippe, Y1 - 2014/05/06/ PY - 2014/5/1/entrez PY - 2014/5/2/pubmed PY - 2014/11/7/medline SP - 5868 EP - 75 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 48 IS - 10 N2 - 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 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. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/24779765/Efficient_peroxydisulfate_activation_process_not_relying_on_sulfate_radical_generation_for_water_pollutant_degradation_ L2 - https://dx.doi.org/10.1021/es501218f DB - PRIME DP - Unbound Medicine ER -