Effects of iron (hydr)oxides on the degradation of diethyl phthalate ester in heterogeneous (photo)-Fenton reactions

Shuai, Wenjuan; Gu, Cheng; Fang, Guodong; Gao, Juan

doi:10.1016/j.jes.2018.06.015

Cited by 35 publications

(8 citation statements)

References 42 publications

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“…Similar processes of free radical generation during the reduction of iron oxides/(oxy)hydroxides are well recognised as astrobiologically relevant methods of organic matter oxidation in Fenton-like reactions (e.g. Foustoukos and Stern, 2012;Shuai et al, 2019).…”

Section: Transformation Of Iron Oxides and Mechanisms For The Transfo...mentioning

confidence: 99%

Pyrolysis of Carboxylic Acids in the Presence of Iron Oxides: Implications for Life Detection on Missions to Mars

et al. 2021

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The search for, and characterisation of, organic matter on Mars is central to efforts in identifying habitable environments and detecting evidence of life in the martian surface and near surface. Iron oxides are ubiquitous in the martian regolith and are known to be associated with the deposition and preservation of organic matter in certain terrestrial environments, thus iron oxide-rich sediments are potential targets for life detection missions. The most frequently used protocol for martian organic matter characterisation (also planned for use on ExoMars) has been thermal extraction for the transfer organic matter to gas chromatography-mass spectrometry detectors. For the effective use of thermal extraction for martian

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Section: Transformation Of Iron Oxides and Mechanisms For The Transfo...mentioning

confidence: 99%

Pyrolysis of Carboxylic Acids in the Presence of Iron Oxides: Implications for Life Detection on Missions to Mars

et al. 2021

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“…In addition, * OH was more probably to form addition products according to the previous studies on PAEs (DEP) degradation, and the stable intermediate mono-(2-ethylhexyl) phthalate may also be generated through hydrolysis, which was related to solution pH. [58,59] Thus, according the above research, we simulated the other two possible photodegradation paths of DEP (route I and III). To further study the degree of difficulty before and after modification of UV photodegradation of DBP molecules, the energy barriers of UV photodegradation reactions of DBP and DBP-OH were calculated (route II in red).…”

Section: Evaluation Of the Uv Photodegradation Of The Pae Derivative ...mentioning

confidence: 94%

Theoretical Design of Biodegradable Phthalic Acid Ester Derivatives in Marine and Freshwater Environments

Zhang

Zhao

2020

ChemistryOpen

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The biodegradability of phtalic acid esters in marine and freshwater environments was characterized by their binding free energy with corresponding degrading enzymes. According to comprehensive biodegradation effects weights, the binding free energy values were converted into dimensionless efficacy coefficient using ratio normalization method. Then, considering comprehensive dual biodegradation effects value and the structural parameters of PAEs in both marine and freshwater environments, a 3D‐QSAR pharmacophore model was constructed, five PAE derivatives (DBP−COOH, DBP−CHO, DBP−OH, DINP−NH2, and DINP−NO2) were screened out based on their environmental friendliness, functionality and stability. The prediction of biodegradation effects on five PAE derivatives by biodegradation models in marine and freshwater environment increased by 15.90 %, 15.84 %, 27.21 %, 12.33 %, and 8.32 %, and 21.57 %, 15.21 %, 20.99 %, 15.10 %, and 9.74 %, respectively. By simulating the photodegradation path of the PAE derivative molecular, it was found that DBP−OH can generate .OH and provides free radicals for the photodegradation of microplastics in the environment.

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“…During py-GC-MS, free radicals (H and OH ) produced during the reduction of iron oxides in the presence of organic matter and the products of iron oxide catalyzed water gas shift reactions would have promoted bond cleavage (Bouarab et al, 2014), leading to the highly deleterious oxidation of organic matter analogous to Fenton-style reactions (Foustoukos and Stern, 2012;Shuai et al, 2019). The presence of phenyl-and diphenyl-thiophene in the untreated clay-poor samples may indicate that Fe 3+ oxidative coupling addition reactions are modifying the products of pyrolysis.…”

Section: Influence Of Mineralogy On Organic Matter Detectability Via mentioning

confidence: 99%

Artificial Maturation of Iron- and Sulfur-Rich Mars Analogues: Implications for the Diagenetic Stability of Biopolymers and Their Detection with Pyrolysis–Gas Chromatography–Mass Spectrometry

2021

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Acidic iron-and sulfur-rich streams are appropriate analogues for the late Noachian and early Hesperian periods of martian history, when Mars exhibited extensive habitable environments. Any past life on Mars may have left behind diagnostic evidence of life that could be detected at the present day. For effective preservation, these remains must have avoided the harsh radiation flux at the martian surface, survived geological storage for billions of years, and remained detectable within their geochemical environment by analytical instrument suites used on Mars today, such as thermal extraction techniques. We investigated the detectability of organic matter within sulfur stream sediments that had been subjected to artificial maturation by hydrous pyrolysis. After maturation, the samples were analyzed by pyrolysis-gas chromatography-mass spectrometry (py-GC-MS) to determine whether organic matter could be detected with this commonly used technique. We find that macromolecular organic matter can survive the artificial maturation process in the presence of iron-and sulfur-rich minerals but cannot be unambiguously distinguished from abiotic organic matter. However, if jarosite and goethite are present in the sulfur stream environment, they interfere with the py-GC-MS detection of organic compounds in these samples. Clay reduces the obfuscating effect of the oxidizing minerals by providing nondeleterious adsorption sites. We also find that after a simple alkali and acid leaching process that removes oxidizing minerals such as iron sulfates, oxides, and oxyhydroxides, the sulfur stream samples exhibit much greater organic responses during py-GC-MS in terms of both abundance and diversity of organic compounds, such as the detection of hopanes in all leached samples. Our results suggest that insoluble organic matter can be preserved over billions of years of geological storage while still retaining diagnostic organic information, but sample selection strategies must either avoid jarositeand goethite-rich outcrops or conduct preparative chemistry steps to remove these oxidants prior to analysis by thermal extraction techniques.

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Effects of iron (hydr)oxides on the degradation of diethyl phthalate ester in heterogeneous (photo)-Fenton reactions

Cited by 35 publications

References 42 publications

Pyrolysis of Carboxylic Acids in the Presence of Iron Oxides: Implications for Life Detection on Missions to Mars

Pyrolysis of Carboxylic Acids in the Presence of Iron Oxides: Implications for Life Detection on Missions to Mars

Theoretical Design of Biodegradable Phthalic Acid Ester Derivatives in Marine and Freshwater Environments

Artificial Maturation of Iron- and Sulfur-Rich Mars Analogues: Implications for the Diagenetic Stability of Biopolymers and Their Detection with Pyrolysis–Gas Chromatography–Mass Spectrometry

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