Metallic Ca−Rh/C-Methanol, A High-Performing System for the Hydrodechlorination/Ring Reduction of Mono- And Poly Chlorinated Aromatic Substrates

Mitoma, Yoshiharu; Kakeda, Mitsunori; Simion, Alina; Egashira, Naoyoshi; Simion, Cristian

doi:10.1021/es9004587

Cited by 19 publications

(12 citation statements)

References 49 publications

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“…For similar reasons, Ca was used instead of Mg [84][85][86][87][88][89][90][91]: not only does Ca have an even higher thermodynamic driving force when compared to Fe or Mg (0.44 V-Fe, 2.37-Mg, 2.87-Ca) but also CaCO 3 coating both protect metallic Ca surface and is easily removed, allowing this procedure to be applied both ex situ and in situ ( Figure 6).…”

Section: Organochlorinementioning

confidence: 99%

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mitoma¹,

Katayama²,

Simion³

2018

Organochlorine

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Defunctionalization of organochlorines through reductive dechlorination (also known as hydrodechlorination-replacement of chlorine atoms by hydrogen-is one of the main methodologies used in the detoxification of these harmful compounds. Most of the published papers on this particular matter focused on specific reagents, reaction conditions, and mainly result efficiency. Some of the authors were also concerned with reaction pathways (e.g., the order in which chlorine atoms were removed from a polychlorinated aromatic substrate-polychlorinated biphenyls, PCBs; polychlorinated dibenzo-p-dioxins, PCDDs; or polychlorinated dibenzofurans, PCDFs). However, the papers that dealt with the investigation of reaction mechanism were rather scarce. This chapter presents the advances made by researchers in understanding, from a mechanistic point of view, the hydrodechlorination process, along with our own assumptions. In doing so, it would be easier to predict the behavior of such compounds in a specific environment, showing more clearly the scope and limitations of each process, depending on the reaction conditions and reagents.

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Section: Organochlorinementioning

confidence: 99%

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mitoma¹,

Katayama²,

Simion³

2018

Organochlorine

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“…Consequently, in a triboplasma state, the CACl bond suffers homolytic dissociation. Whereas the phenyl radical is trapped by a hydrogen donor, CaO scavenges the chlorine atoms (Scheme 1) [46][47][48][49][50]61].…”

Section: Hydrodechlorination Process Of Pcdds/fs Contaminated Soil Samentioning

confidence: 99%

Hydrodechlorination of PCDD/PCDF/PCB contaminants by simple grinding of contaminated soils with a nano‐size calcium reagent

Mitoma

Simion

Mallampati

et al. 2015

Env Prog and Sustain Energy

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PCDDs, PCDFs, and PCBs present in soil can be hydrodechlorinated without a preliminary separation (extraction) step using a nano‐size dispersed mixture of metallic Ca and CaO (206 nm average particle size). The treatment is quite simple: grinding in an electric mortar (100 rpm) at room temperature in open atmosphere for 24 h, producing up to 91, 99 and 97% hydrodechlorination yield for PCDDs, PCDFs and PCBs, respectively. The method is sensitive to soil moisture content, but because of its simplicity and low‐cost, it can accommodate larger‐scale adaptation. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 34–40, 2016

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“…Reductive dechlorination is considered a promising method for selectively removing chlorine atoms from aromatic compounds. Among these reductive dechlorination techniques, electrochemical dechlorination is more favorable because the process is easy to control, amenable to automation, highly efficient, and environmentally sustainable [10,11].…”

Section: Introductionmentioning

confidence: 99%

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode

Bao

2015

Front. Environ. Sci. Eng.

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In this study, palladium-loaded titania nanotubes was fabricated on a titanium plate (Pd/TiO 2 NTs/Ti) for efficient electrodechlorination of 2,4-chlorophenol with a mild pH condition. The nature of Pd/TiO 2 NTs/Ti electrodes was characterized by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) techniques. The characterization results indicated the generation of Pd 0 nanoparticles which were evenly dispersed on titania nanotubes arrays on the Pd/ TiO 2 NTs/Ti surface. An effective degradation efficiency of up to 91% was achieved within 60 min at cathode potential of -0.7 V (vs. SCE) and initial pH of 5.5. The effects of the applied cathode potential and initial pH on the degradation efficiency were studied. A near neutral condition was more favorable since very low and very high pHs were not conducive to the dechlorination process. Furthermore, the intermediates analysis showed that the Pd/TiO 2 NTs/Ti electrode could completely remove chlorine from 2, 4-dichlorophenol since only phenol was detected as the byproduct and the concentration of released chlorine ions indicated near-complete dechlorination. This work presents a good alternative technique for eliminating persistent chlorophenols in polluted wastewater without maintaining strong acidic environment.

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Metallic Ca−Rh/C-Methanol, A High-Performing System for the Hydrodechlorination/Ring Reduction of Mono- And Poly Chlorinated Aromatic Substrates

Cited by 19 publications

References 49 publications

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Hydrodechlorination of PCDD/PCDF/PCB contaminants by simple grinding of contaminated soils with a nano‐size calcium reagent

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode

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