Insights on the pH-dependent roles of peroxymonosulfate and chlorine ions in phenol oxidative transformation

Li, Chen‐Xuan; Chen, Chang-Bin; Wang, Yunjie; Fu, Xian-Zhong; Cui, Shuo; Lu, Jiayue; Li, Jie; Liu, Houqi; Li, Wen‐Wei; Lau, Tze Kin

doi:10.1016/j.cej.2019.01.057

Cited by 74 publications

(11 citation statements)

References 45 publications

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“…In addition, it should be noted that the reaction between chloride and PMS at acidic pH would generate reactive chlorine species such as Cl 2 and HClO, and further led to organic chlorination. But this undesirable side reaction was highly inhibited because 1 O 2 was mainly produced at alkali pH so that chloride showed negligible effect on phenol transformation [ 44 ].…”

Section: Evolution Of 1 O 2 mentioning

confidence: 99%

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Xiao

Faheem

et al. 2021

IJERPH

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Advanced oxidation processes (AOPs) based on peroxydisulfate (PDS) or peroxymonosulfate (PMS) activation have attracted much research attention in the last decade for the degradation of recalcitrant organic contaminants. Sulfate (SO4•−) and hydroxyl (•OH) radicals are most frequently generated from catalytic PDS/PMS decomposition by thermal, base, irradiation, transition metals and carbon materials. In addition, increasingly more recent studies have reported the involvement of singlet oxygen (1O2) during PDS/PMS-based AOPs. Typically, 1O2 can be produced either along with SO4•− and •OH or discovered as the dominant reactive oxygen species (ROSs) for pollutants degradation. This paper reviews recent advances in 1O2 generation during PDS/PMS activation. First, it introduces the basic chemistry of 1O2, its oxidation properties and detection methodologies. Furthermore, it elaborates different activation strategies/techniques, including homogeneous and heterogeneous systems, and discusses the possible reaction mechanisms to give an overview of the principle of 1O2 production by activating PDS/PMS. Moreover, although 1O2 has shown promising features such as high degradation selectivity and anti-interference capability, its production pathways and mechanisms remain controversial in the present literatures. Therefore, this study identifies the research gaps and proposes future perspectives in the aspects of novel catalysts and related mechanisms.

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Section: Evolution Of 1 O 2 mentioning

confidence: 99%

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Xiao

Faheem

et al. 2021

IJERPH

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“…It has been reported that the activation of persulfate in the presence of high concentration of Cl − can produce active chlorine leading to the formation of chlorinated disinfection byproducts (CDBPs). 42 Here, total organic chlorine (TOCl) was used as a surrogate measurement and toxicity indicator for the total amount of CDBPs in condensed freshwater. A new method with the combination of O 3 /UV oxidation and ion chromatography was designed for the determination of TOCl.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Removal of Typical Volatile Organic Compounds in Condensed Freshwater by Activated Persulfate during Interfacial Solar Distillation

Xiao

Zhou

et al. 2021

ACS EST Water

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Recently, seawater desalination based on interfacial solar heating has attracted attention because of its environmental protection and high photothermal conversion efficiency. However, the high air–water interface temperature may cause freshwater quality safety risks because the volatile organic compounds (VOCs) in seawater are more likely to evaporate and condense into freshwater. In this work, typical VOCs (phenol) were prevented from entering into the condensed freshwater by using activated persulfate to take full advantage of interfacial solar distillation. The results showed that the addition of both peroxodisulfate (PDS) and peroxymonosulfate (PMS) could effectively reduce the concentration of phenol in condensed freshwater. The phenol’s distillation concentration rate (R D) was reduced from 74.4% to 14.3% with PMS and 20.5% with PDS. The Cl– was the main factor for activation of PMS, while carbon black, light, and heat were the main factors for activation of PDS. Meanwhile, PMS is better suited for removing VOCs due to its lower oxidant dosage and chlorinated disinfection byproducts compared with PDS. Finally, when real seawater samples were used as the source water for solar distillation, the water quality of typical indicators was lower than the limits set by Drinking Water Quality in China, US EPA, and WHO.

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“…Besides the pH, some studies have reported concentration-dependent dual effects of Cl − . 62,127 The negative effect was observed at a relatively low Cl − concentration (Fig. 6b).…”

Section: Effects Of Anions On Persulfate-based Aops For Sow Treatmentmentioning

confidence: 91%

“…127 Cl − can enhance the degradation process by forming HClO at an acidic pH and increase with higher concentrations of Cl − . 127 Although it seems that the degradation process was enhanced under acidic conditions, the intermediates were primarily toxic chlorinated organic compounds. The effect of Cl − should be further evaluated.…”

Section: Effects Of Anions On Persulfate-based Aops For Sow Treatmentmentioning

confidence: 99%

Insights into the relationship of reactive oxygen species and anions in persulfate-based advanced oxidation processes for saline organic wastewater treatment

Luo

Wang

Yao

et al. 2022

Environ. Sci.: Water Res. Technol.

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Insights on the pH-dependent roles of peroxymonosulfate and chlorine ions in phenol oxidative transformation

Cited by 74 publications

References 45 publications

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Removal of Typical Volatile Organic Compounds in Condensed Freshwater by Activated Persulfate during Interfacial Solar Distillation

Insights into the relationship of reactive oxygen species and anions in persulfate-based advanced oxidation processes for saline organic wastewater treatment

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