Enhanced photocatalytic activity of degrading short chain chlorinated paraffins over reduced graphene oxide/CoFe2O4/Ag nanocomposite

Chen, Xin; Zhao, Qidong; Li, Xinyong; Wang, Dong

doi:10.1016/j.jcis.2016.06.053

Cited by 29 publications

(3 citation statements)

References 58 publications

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“…While studies on biodegradation found the possibility of degradation in activated sewage sludge (Heath et al, 2004;Lu, 2012) and aerobic sediments (European Chemicals Bureau, 2008;Tomy et al, 1999;UNEP, 2015), SCCPs can still be detected in sediments after more than 50 years. Besides biodegradation, the other potentially relevant environmental sink for SCCPs is photodegradation; however, there are only a few studies focusing on this process (Chen et al, 2016;El-Morsi et al, 2000;Friesen et al, 2004;Yan et al, 2021;Zhang et al, 2019). These studies leave major knowledge gaps regarding photochemical degradation under environmentally relevant conditions.…”

Section: Introductionmentioning

confidence: 99%

Photochemical Degradation of Short-Chain Chlorinated Paraffins in Aqueous Solution by Hydrated Electrons and Hydroxyl Radicals

DiMento

Tusei

Aeppli

2022

Preprint

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Short-chain chlorinated paraffins (SCCPs) are a complex mixture of polychlorinated alkanes (C10-C13, chlorine content 40-70%), and have been categorized as persistent organic pollutants. However, there are knowledge gaps about their environmental degradation, particularly the effectiveness and mechanism of photochemical degradation in surface waters. Photochemically-produced hydrated electrons (e-(aq)) have been shown to degrade highly chlorinated compounds in environmentally-relevant conditions more effectively than hydroxyl radicals (·OH), which can degrade a wide range of organic pollutants. This study aimed to evaluate the potential for e-(aq) and ·OH to degrade SCCPs. To this end, the degradation of SCCP model compounds was investigated under laboratory conditions that photochemically produced e-(aq) or ·OH. Resulting SCCP degradation rate constants for e-(aq) were on the same order of magnitude as well-known chlorinated pesticides. Experiments in the presence of ·OH yielded similar or higher second-order rate constants. Trends in e-(aq) and ·OH SCCP model compounds degradation rate constants of the investigated SCCPs were consistent with that of other chlorinated compounds, with higher chlorine content producing in higher rate constants for e-(aq) and lower for ·OH. Above a chlorine:carbon ratio of approximately 0.6, the e-(aq) second-order rate constants were higher than rate constants for ·OH reactions. Results of this study furthermore suggest that SCCPs are likely susceptible to photochemical degradation in sunlit surface waters, facilitated by dissolved organic matter that can produce e-(aq) and ·OH when irradiated.

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Section: Introductionmentioning

confidence: 99%

Photochemical Degradation of Short-Chain Chlorinated Paraffins in Aqueous Solution by Hydrated Electrons and Hydroxyl Radicals

DiMento

Tusei

Aeppli

2022

Preprint

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“…Besides biodegradation, the other potentially relevant environmental sink for SCCPs is photodegradation; however, there are only a few studies focusing on this process. [29][30][31][32][33] These studies leave major knowledge gaps regarding photochemical degradation under environmentally relevant conditions. To constrain the fate of SCCPs in the environment, more research into their photochemistry is necessary.…”

Section: Introductionmentioning

confidence: 99%

Photochemical Degradation of Short-Chain Chlorinated Paraffins in Aqueous Solution by Hydrated Electrons and Hydroxyl Radicals

DiMento¹,

Tusei²,

Aeppli³

2020

Preprint

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<p>Short-chain chlorinated paraffins (SCCPs) are a complex mixture of polychlorinated alkanes (C10-C13, chlorine content 40-70%). While these compounds are categorized as persistent organic pollutants, there are knowledge gaps about their environmental degradation, particularly the effectiveness and mechanism of photochemical degradation in surface waters. Photochemically-produced hydrated electrons (e-(aq)) have been shown to degrade highly chlorinated compounds in environmentally-relevant conditions more effectively than hydroxyl radicals (·OH), which can degrade a wide range of organic pollutants. This study aimed to evaluate the potential for e-(aq) to degrade SCCPs, and compare this reaction to ·OH-mediated degradation. To this end, the degradation of SCCP model compounds was investigated under laboratory conditions that photochemically produced e-(aq) or ·OH. Resulting SCCP degradation rate constants for e-(aq) were on the same order of magnitude as well-known chlorinated pesticides. Experiments in the presence of ·OH yielded similar or higher second-order rate constants. By compiling literature data for a wide range of chlorinated compounds, it was found that higher chlorine content results in higher rate constants for e-(aq) and lower for ·OH. Above a composition of approximately 60 % Cl, the e-(aq) second-order rate constants were higher than rate constants for ·OH reactions. The results of this study imply that SCCPs are susceptible to photochemical degradation in the environment, facilitated by dissolved organic matter and other sources of reactive intermediates in sunlit surface waters.<br></p>

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“…Therein, Fe 3 O 4 surface absorbing GSH can create a fluorescent emission area (417 nm), compared to that of single Fe 2 O 3 semiconductor (435 nm) . Especially, the core–shell interface possesses new highly fluorescent emission maxima (785/795 nm) that allows site-specific binding to GSH molecules, whereas the separation of electron–hole pairs hinders ultrafast recombination of photogenerated carriers, contributing to the sp 2 hybridization of two half-full O 2p 4 and S 3p 4 orbitals. , Taking into account the improvement of electron–hole pairs separation, Pailhé et al confirmed that the very broad and intense absorption phenomena in the visible region (400–800 nm) is only attributed to a double ligand-to-metal 2p(O 2– ) → 3d(Fe 3+ ) charge transfer, due to a metal (Mg 2+ or Zn 2+ ) occupying the Fe 2+ site at tetrahedron. Simultaneously, Zn–GSH coordination gives rise to a new charge transfer transition (at 729) at 340 nm excitation and 400 nm emission .…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Water-Soluble Glutathione Thiol-Capped n-Hematite–p–XZn-Ferrites (X = Mg, Mn, or Ni): Experiment and Theory

et al. 2017

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A facile bioapproach has been developed to fabricate nonfluorescent Fe2O3–XZnFe2O4 (X = Mg, Mn, or Ni) hematite core–ferrite shell structures. Major efforts are focused on the self-organization process of water-soluble glutathione (GSH) onto hematite core–ferrite shell nanoparticles, for example, by altering the electron–hole recombination and unpaired–paired spin change using X–Zn codoping. The X–Zn codoping enhances the fluorescence response intensity of Fe2O3 core–XZnFe2O4 shell structure. The relative ligand-to-metal 2p(O2–) → 3d(Fe3+) charge transfer located in visible region (755 nm) changes to 2p(O2–) → −SH charge transfer located in near-infrared region (785 nm), when [FeO6] octahedra complexs with thiol (−SH) group of GSH. These results help to enhance the current understanding about the mechanism for the tunable emission of Fe2O3–XZnFe2O4 in the visible–near-infrared range and its self-assembly behavior.

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Enhanced photocatalytic activity of degrading short chain chlorinated paraffins over reduced graphene oxide/CoFe2O4/Ag nanocomposite

Cited by 29 publications

References 58 publications

Photochemical Degradation of Short-Chain Chlorinated Paraffins in Aqueous Solution by Hydrated Electrons and Hydroxyl Radicals

Photochemical Degradation of Short-Chain Chlorinated Paraffins in Aqueous Solution by Hydrated Electrons and Hydroxyl Radicals

Photochemical Degradation of Short-Chain Chlorinated Paraffins in Aqueous Solution by Hydrated Electrons and Hydroxyl Radicals

Self-Assembly of Water-Soluble Glutathione Thiol-Capped n-Hematite–p–XZn-Ferrites (X = Mg, Mn, or Ni): Experiment and Theory

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