Enhanced photocatalytic performance of N-nitrosodimethylamine on TiO2 nanotube based on the role of singlet oxygen

Guo, Xiaoyan; Li, Qilin; Zhang, Man; Long, Mingce; Kong, Lulu; Zhou, Qixing; Shao, Huaiqi; Hu, Wanli; Wei, Tingting

doi:10.1016/j.chemosphere.2014.09.002

Cited by 45 publications

(24 citation statements)

References 39 publications

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“…•formation is presumed to be same as in H 2 O 2 /bicarbonate system (Lin and Liu 2009;Yao and Richardson 2003 (Guo et al, 2015;Xu et al, 2011). It should be noted that formation of 1 O 2 might be insignificant in the presence of acetaminophen because as an electron-rich compound it scavenger most of the CO 3 •-.…”

Section: Mechanism Of Omentioning

confidence: 86%

Bicarbonate-activated persulfate oxidation of acetaminophen

Jiang

et al. 2017

Water Research

187

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Persulfate (PS) is widely used as an oxidant for in situ chemical remediation of contaminated groundwater. In this study we demonstrated for the first time that PS could be activated by bicarbonate. Acetaminophen was used as the probe compound to examine the reactivity of PS/bicarbonate system. It was found that acetaminophen could be effectively transformed and the reaction rate appeared pseudo-first-order to the concentrations of both acetaminophen and PS. Radical scavenger tests indicated that neither free radicals (SO and HO) nor superoxide (O) was responsible for acetaminophen transformation. Generation of singlet oxygen (O) was verified using furfuryl alcohol (FFA) as a probe. Formation of O was further quantified in DO fortified solution based on kinetic solvent isotopic effect (KSIE) but it was found that O contributed only 51.4% of the total FFA transformation. The other 48.6% was presumed to be ascribed to the reaction with peroxymonocarbonate (HCO). However, the transformation of acetaminophen was mostly due to the reaction with HCO but not O. Instead of degradation, HCO oxidized acetaminophen via a one-electron abstraction mechanism resulting in the generation of acetaminophen radicals which coupled to each other to form dimers and trimers. HCO also hydrolyzed rapidly to form hydrogen peroxide (HO) which led to the formation of O, during which O was a key intermediates. Because bicarbonate is ubiquitously presented in groundwater, the findings of this research provide important insights into the fundamental processes involved in PS oxidation in subsurface.

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Section: Mechanism Of Omentioning

confidence: 86%

Bicarbonate-activated persulfate oxidation of acetaminophen

Jiang

et al. 2017

Water Research

187

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“…1 O 2 is a strong oxidant with standard reduction potential of E h = 1.52 V [22]. It is usually produced by photocatalytic activation of dissolved oxygen on metal oxides such as TiO 2 and ZnO [23,24]. In addition, many other chemicals such as potassium perchromate [25], triphenyl phosphite [26] and ozonide [27] could also generate 1 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Cyanide oxidation by singlet oxygen generated via reaction between H 2 O 2 from cathodic reduction and OCl − from anodic oxidation

Tian¹,

Zeng

et al. 2016

Journal of Colloid and Interface Science

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“…1 O 2 is more eco-friendly and efficient than free radicals in the reaction with certain classes of organic compounds (e.g., furans and phenols) 43, 44 . Although the 1 O 2 is very promising in the degradation of contaminants from waste water 45–47 , there exists no report over the photodegradation of BPA by MOFs for organic pollutant treatment based on 1 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh adsorption and singlet-oxygen mediated degradation for efficient synergetic removal of bisphenol A by a stable zirconium-porphyrin metal-organic framework

Meng

Chaihu

Chen

et al. 2017

Sci Rep

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Bisphenol A (BPA), one of 23 most important endocrine disrupting chemicals, was efficiently removed and sequentially photodegraded by a zirconium-porphyrin metal–organic framework (MOF) catalyst under visible light for water treatment. Well control of photodegradation allows the kinetic separation of adsorption step and photodegradation step. Ultrahigh adsorption uptake of 487.69 ± 8.37 mg g−1 is observed, while efficient photodegradation could be observed within 20 min at the rate of 0.004 mg min−1. The synergetic effect boosts the photocatalytic efficiency and confirms that the catalysis happens inside the MOF pores other than in the solution phase. Furthermore, the mechanism was elucidated by diverse control experiments, such as in the conditions of 1O2 scavenger, in darkness and with the changes of light sensitizing ligands. It confirmed that BPA was oxidized by the 1O2 which was generated from porphyrin ligand within MOFs under visible-light. The excellent reusability and wide range of suitable pH range make the Zr-porphyrin MOFs practical for the photocatalytic water treatment processes.

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Enhanced photocatalytic performance of N-nitrosodimethylamine on TiO2 nanotube based on the role of singlet oxygen

Cited by 45 publications

References 39 publications

Bicarbonate-activated persulfate oxidation of acetaminophen

Bicarbonate-activated persulfate oxidation of acetaminophen

Cyanide oxidation by singlet oxygen generated via reaction between H 2 O 2 from cathodic reduction and OCl − from anodic oxidation

Ultrahigh adsorption and singlet-oxygen mediated degradation for efficient synergetic removal of bisphenol A by a stable zirconium-porphyrin metal-organic framework

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