Theoretical and experimental formation of low chlorinated dibenzo-p-dioxins and dibenzofurans in the Fenton oxidation of chlorophenol solutions

Fernández-Castro, Pablo; Román, M. Fresnedo San; Ortiz, Inmaculada

doi:10.1016/j.chemosphere.2016.07.011

Cited by 22 publications

(15 citation statements)

References 52 publications

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“…In the past decades, several efficient ways to treat wastewater containing organic and inorganic pollutants have been considered as one of the important topics in environmental science [1][2][3][4][5]. Chlorinated organic compounds (e.g., dioxins, polychlorophenols) are known as significant environmental pollutants, because these compounds have great resistance to biological degradation processes and affect serious health problems (e.g., nervous or respiratory systems) via the bioaccumulation of organisms in the ecosystem [6]. The emission of chlorinated organic compounds could be a result of combustion processes or several industries such as pulp, herbicides, petroleum refineries, dyes, pharmaceuticals, and pesticides [7,8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Activated Biochar-Supported Magnetite Composite for Adsorption of Polychlorinated Phenols from Aqueous Solutions

Jun

Kim

Han

et al. 2019

Water

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For this study, we applied activated biochar (AB) and its composition with magnetite (AB-Fe3O4) as adsorbents for the removal of polychlorophenols in model wastewater. We comprehensively characterized these adsorbents and performed adsorption tests under several experimental parameters. Using FTIR, we confirmed successful synthesis of AB-Fe3O4 composite through cetrimonium bromide surfactant. We conducted adsorption tests using AB and AB-Fe3O4 to treat model wastewater containing polychlorophenols, such as 2,3,4,6-Tetrachlorophenol (TeCP), 2,4,6-Trichlorophenol (TCP), and 2,4-Dichlorophenol (DCP). Results of the isotherm and the kinetic experiments were well adapted to Freundlich’s isotherm model and the pseudo-second-order kinetic model, respectively. Main adsorption mechanisms in this study were attributed to non-covalent, π-electron acceptor–donor interactions and hydrophobic interactions judging from the number of chloride elements in each chlorophenol and its hydrophobic characteristics. We also considered the electrostatic repulsion effect between TeCP and AB, because adsorption performance of TeCP at basic condition was slightly worse than at weak acidic condition. Lastly, AB-Fe3O4 showed high adsorption selectivity of TeCP compared to other persistent organic pollutants (i.e., bisphenol A and sulfamethoxazole) due to hydrophobic interactions. We concluded that AB-Fe3O4 may be used as novel adsorbent for wastewater treatment including toxic and hydrophobic organic pollutants (e.g., TeCP).

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Section: Introductionmentioning

confidence: 99%

Preparation of Activated Biochar-Supported Magnetite Composite for Adsorption of Polychlorinated Phenols from Aqueous Solutions

Jun

Kim

Han

et al. 2019

Water

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“…17,18 Meanwhile, in the paper industry, some small amounts of lignin-derived biaryl dimers in wood-rich pulps have been converted to dibenzofuran derivatives. 19,20 Although the primary aim is not chemical synthesis, it appears that dibenzofurans have been prepared from sustainable biomass.…”

Section: ■ Introductionmentioning

confidence: 99%

“…More unfortunately, these reported reactants are derived from fossils, which is not beneficial for the sustainable chemical industry in the future. Recently, some environmental scientists found that lignin-derived monomers (such as catechol) can be used to synthesize dibenzofuran under pyrolytic and combustion conditions in thermal systems, such as solid waste incinerators (Scheme D). , Meanwhile, in the paper industry, some small amounts of lignin-derived biaryl dimers in wood-rich pulps have been converted to dibenzofuran derivatives. , Although the primary aim is not chemical synthesis, it appears that dibenzofurans have been prepared from sustainable biomass.…”

Section: Introductionmentioning

confidence: 99%

Selective Synthesis of Bioderived Dibenzofurans and Bicycloalkanes from a Cellulose-Based Route

Cai

Deng

Peng

et al. 2021

ACS Sustainable Chem. Eng.

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The synthesis of dibenzofurans and bicycloalkanes from biomass is important for sustainable high-value chemicals and high-density fuels. Currently, their biomass-based precursor is mainly derived from lignin with limited yields. Herein, we propose a cellulose-based synthesis route for dibenzofurans with a yield of 72.3% via the integration of oxidative coupling of 1,2,4-benzenetriol to diphenol combined with subsequent dehydration under environmentally friendly reaction conditions. After hydrodeoxygenation, bicycloalkanes are obtained with a yield of 70.5% by catalysis performed over Pd/C and various zeolites. This work provides a powerful cellulose-based strategy for the synthesis of dibenzofurans and bicycloalkanes, which was previously unattainable in the conventional lignin-based route.

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“…Thus, developing cost-effective remediation technologies that prevent the presence of this pollutant in natural resources constitutes a techno-scientific challenge. Advanced oxidation processes (AOPs) came out as a set of alternative technologies to provide effective solutions to the degradation of persistent and emerging pollutants [2,[24][25][26][27][28]. With regard to TCS degradation, photolytic treatments, photolysis and photocatalysis, have attracted the interest of the scientific community.…”

Section: Introductionmentioning

confidence: 99%

“…Photocatalysis takes place when a semiconductor, the photocatalyst, absorbs photons that possess equal or higher energy than the photocatalyst band gap, generating electron-hole pairs (e − and h + , respectively) on the catalyst surface [29]. These react with H 2 O producing reactive oxygen species, ROS, responsible of the cleavage and consecutive changes of the molecule of interest [24,30,31].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Transformation of Triclosan. Reaction Products and Kinetics

2020

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5-Chloro-2-[2,4-dichlorophenoxy]-phenol, or triclosan (TCS), is an antimicrobial and antifungal agent with high resistance to conventional wastewater treatments, thus, more effective remediation technologies are necessary, where photocatalytic processes deserve special attention due to the high degradation rates of TCS, and the use of a renewable source of energy. However, different by-products may be formed during the treatment, sometimes more harmful than the parent compounds. Efforts to detail reaction pathways continually feed into related literature; however, knowing the transformation kinetics and the dependence on the operating variables is essential for the correct design of the abovementioned remediation technologies. This work contributes to increasing the knowledge necessary for the application of photocatalytic processes for the degradation of emerging pollutants, with TCS as a case study. First, an experimental plan to analyze the influence of the operating variables was carried out, determining time courses of the parent and intermediate compounds. Next, the kinetic model and parameters that are capable of predicting TCS concentration and its derivatives as a function of the operating conditions are provided. This constitutes a very useful tool to predict the performance of wastewater remediation treatment both in the degradation of the original pollutant and in the reduction of the toxicity in the treated water.

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Theoretical and experimental formation of low chlorinated dibenzo-p-dioxins and dibenzofurans in the Fenton oxidation of chlorophenol solutions

Cited by 22 publications

References 52 publications

Preparation of Activated Biochar-Supported Magnetite Composite for Adsorption of Polychlorinated Phenols from Aqueous Solutions

Preparation of Activated Biochar-Supported Magnetite Composite for Adsorption of Polychlorinated Phenols from Aqueous Solutions

Selective Synthesis of Bioderived Dibenzofurans and Bicycloalkanes from a Cellulose-Based Route

Photocatalytic Transformation of Triclosan. Reaction Products and Kinetics

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