Mechanochemical degradation of hexachlorobenzene with a combined additive of SiC and Fe

Nie, Maofeng; Dong, Yan; Song, Zhanlong; Zhao, Cheng; Chen, Shouyan

doi:10.1016/j.cherd.2021.10.035

Cited by 6 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This indicates that the active oxygen in LiCoO2 can transfer electrons to the aromatic structure thus inducing the reduction of BDE 209. Fe 2p spectra are shown in Figure 5f, with binding energies of Fe 2p2/3 and Fe 2p1/2 measured at 710.8 eV and 724 eV, characteristic of Fe(III) [42]. This confirmed that Fe(0) was converted to Fe(III) and acted as the reducing agent during the treatment.…”

Section: Degradation Pathway Of Bde 209mentioning

confidence: 66%

Enhanced Degradation of Decabromodiphenyl Ether via Synergetic Assisted Mechanochemical Process with Lithium Cobalt Oxide and Iron

Lou,

Sui,

Zhang

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The removal of decabromodiphenyl ether (BDE 209), as a typical persistent organic pollutant (POP), is of worldwide concern. Mechanochemical (MC) processes are promising methods to degrade environmental pollutants, most of which use a single grinding reagent. The performance of MC processes with co-milling agents still needs to be further verified. In this study, an efficient MC treatment with combined utilization of lithium cobalt oxide (LiCoO2) and iron (Fe) as co-milling reagents for BDE 209 degradation was investigated. The synchronous action of LiCoO2 and Fe with a LiCoO2/Fe/Br molar ratio of 1.5:1.67:1 and a ball-to-powder ratio of 100:1 led to almost thorough-paced abatement and debromination of BDE 209 within 180 min using a ball milling rotation speed of 600 rpm. The reduction in particle sizes and the destruction of crystal structure in mixture powders with the increase in milling time induced the enhanced degradation of BDE 209, as characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The X-ray photoelectron spectroscopy (XPS) characterization showed that the valence state of Co was converted from Co(III) to Co(II), and Fe(0) was changed to Fe(III) when treated with an MC process. This indicated that the reductive debromination of BDE 209 by Fe and the following oxidative degradation of debrominated products by LiCoO2 were integrated in a concerted way. It proved the removal of BDE 209 via an MC treatment. The full breakage of C-Br and C-O bonds in BDE 209 was confirmed by Fourier transform-infrared spectrometry (FT-IR) spectra, and a possible abatement pathway was also proposed based on the identified intermediate products using gas chromatography–mass spectrometry (GC-MS). These obtained results indicated that a combination of LiCoO2 and Fe as co-milling reagents is promising in the MC treatment of toxic halogenated pollutants like BDE 209.

show abstract

Section: Degradation Pathway Of Bde 209mentioning

confidence: 66%

Enhanced Degradation of Decabromodiphenyl Ether via Synergetic Assisted Mechanochemical Process with Lithium Cobalt Oxide and Iron

Lou,

Sui,

Zhang

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…In view of the lack of less chlorinated benzene (except for PeCB), HCB may undergo partial dechlorination to form chlorinated phenyl radicals, followed by the recombination of these radicals and the deep dechlorination in sequence. In other MC systems, reducing agents like zero-valent metals and Lewis bases can work as electron donors to induce dechlorination, thus generating partial chlorinated phenyl radicals. − These radicals may subsequently couple with (1) hydrogen atoms to form less chlorinated molecules (hydrogenation) or (2) each other to form polymers (polymerization) . According to the results of GC/MS, polymerization followed by dechlorination is considered as the predominant route in this case.…”

Section: Resultsmentioning

confidence: 99%

Sulfite as a Green Co-milling Agent for Mechanochemical Destruction of Polychlorinated Aromatics: Working Mechanism and Structural Dependence

et al. 2023

View full text Add to dashboard Cite

Mechanochemical destruction of obsolete halogenated persistent organic chemicals (especially polychlorinated aromatics) has been documented as a safe non-combustion technology, but the smooth implementation of such a system still calls for an appropriate and sustainable co-milling agent. As an example, we show that Na 2 SO 3 as a co-milling agent not only achieves faster degradation rate for hexachlorobenzene (HCB) than calcium oxide (1.4-fold) and reduced iron powders (2.9-fold) with equal mass but also enables high dechlorination ratio (97.4%) after 4 h of milling in a planetary mill. With the input of mechanical energy, the mechanistic study suggests that sulfite salts suffer partial melt to generate SO 3 2− species on fresh surfaces, which attack HCB molecules via the one-electron-transfer mechanism. Detection on intermediates and characterization on milled samples demonstrate that HCB undergoes dechlorination, polymerization, and hydrogenation and finally converts to amorphous and graphitic carbons. Correlation analysis indicates that the degradation reactivity of a specific polychlorinated aromatic compound in such a system is strongly dependent on its molecular structure (e.g., substituent groups and degree of chlorination). This work provides a new insight for utilizing sulfite for green disposal of halogenated wastes.

show abstract

“…(2) MCT possesses a relatively high reaction rate that pollutants can usually be degraded within hours; (3) MCT is an environmentally innocuous route that minimal hazardous by-products formed in the process (Nie et al 2022). It is noted that MCT is usually employed for treating solid-state pollutants, and in some cases, some kind of liquid pollutants such as tetrachloroethane and oil can also be treated via MCT.…”

mentioning

confidence: 99%

Mechanochemical treatment for degradation of ciprofloxacin (CIP) in solutions

Feng

Dong

Wang

et al. 2022

Water Science and Technology

View full text Add to dashboard Cite

Ciprofloxacin (CIP) is a kind of widely used fluoroquinolone antibiotic, and the widespread presence of CIP in aquatic environment has become a serious issue. Mechanochemical treatment (MCT), as an effective approach to degrade persistent organic pollutants, has many advantages of low-cost, simplicity, and environmentally innocuous. However, few attentions have been paid on employing MCT to treat effluents containing CIP. In this study, MCT was introduced to degrade CIP in aquatic solutions. A series of CIP degradation experiments were conducted by a planetary ball mill, and the influences of main parameters on CIP degradation efficiency were investigated. Furthermore, an optimum combination was selected through orthogonal experiments, and CIP degradation efficiency could reach as high as 99% in certain conditions. Besides, the biotoxicity of CIP solution was also studied. MCT exhibits satisfying performances for degrading CIP in solutions, which make MCT as a promising approach to CIP elimination and also encourages further applications in treating effluents containing other organic pollutants.

show abstract

Mechanochemical degradation of hexachlorobenzene with a combined additive of SiC and Fe

Cited by 6 publications

References 26 publications

Enhanced Degradation of Decabromodiphenyl Ether via Synergetic Assisted Mechanochemical Process with Lithium Cobalt Oxide and Iron

Enhanced Degradation of Decabromodiphenyl Ether via Synergetic Assisted Mechanochemical Process with Lithium Cobalt Oxide and Iron

Sulfite as a Green Co-milling Agent for Mechanochemical Destruction of Polychlorinated Aromatics: Working Mechanism and Structural Dependence

Mechanochemical treatment for degradation of ciprofloxacin (CIP) in solutions

Contact Info

Product

Resources

About