Dechlorination of short chain chlorinated paraffins by nanoscale zero-valent iron

Zhang, Zhiyong; Lu, Mang; Xiao, Meng; Zhang, Min

doi:10.1016/j.jhazmat.2012.10.004

Cited by 27 publications

(8 citation statements)

References 27 publications

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“…Some halogenated organic compounds, such as PCBs and PBDEs, show dehalogenation and halogen rearrangement in plants (Liu et al, 2009; Wang et al, 2011a,b). The dechlorination of SCCPs had been reported under the role of nanoscale zero-valent iron (Zhang et al, 2012), indicating that SCCPs can be dechlorinated in suitable conditions. Thus, dechlorination and chlorine rearrangement products of 1,2,5,5,6,9,10-HepCD in the whole pumpkin seedlings were investigated.…”

Section: Resultsmentioning

confidence: 99%

Dechlorination and chlorine rearrangement of 1,2,5,5,6,9,10-heptachlorodecane mediated by the whole pumpkin seedlings

Liu

Hou

et al. 2017

Environmental Pollution

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Short chain chlorinated paraffins (SCCPs) are ubiquitously present as persistent organic pollutants in the environment. However, little information on the interaction of SCCPs with plants is currently available. In this work, young pumpkin plants (Cucurbita maxima × C. Moschata) were hydroponically exposed to the congener of chlorinated decane, 1,2,5,5,6,9,10-heptachlorodecane (1,2,5,5,6,9,10-HepCD), to investigate the uptake, translocation and transformation of chlorinated decanes in the intact plants. It was found that parent HepCD was taken up by the pumpkin roots, translocated from root to shoots, and phytovolatilized from pumpkin plants to air via the plant transpiration flux. Our data suggested that dechlorination of 1,2,5,5,6,9,10-HepCD to lower chlorinated decanes and rearrangement of chlorine atoms in the molecule were all mediated by the whole pumpkin seedlings. Chlorinated decanes were found in the shoots and roots of blank controls, indicating that chlorinated decanes in the air could be absorbed by leaves and translocated from shoots to roots. Lower chlorinated congeners (CHCl) tended to detain in air compared to higher chlorinated congeners (CHCl and other CHCl). Potential transformation pathway and behavior of 1,2,5,5,6,9,10-HepCD in pumpkin were proposed based on these experiments.

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Section: Resultsmentioning

confidence: 99%

Dechlorination and chlorine rearrangement of 1,2,5,5,6,9,10-heptachlorodecane mediated by the whole pumpkin seedlings

Liu

Hou

et al. 2017

Environmental Pollution

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“…To date, SCCPs have been reduced by treatment with metal sodium dispersion dechlorination [6], zero-valent iron [7], and photocatalytic degradation [8][9][10]. However, the current use of physicochemical treatment methods to remove SCCPs is expensive, and the operating conditions are also severe.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pressurized Aeration on the Biodegradation of Short-Chain Chlorinated Paraffins by Escherichia coli Strain 2

Qian

Han

Zhou³

et al. 2022

Membranes

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Short-chain chlorinated paraffins (SCCPs) were defined as persistent organic pollutants in 2017, and they can migrate and transform in the environment, accumulate in organisms, and amplify through the food chain. Although they pose a serious threat to environmental safety and human health, there are few papers on their removal. The current SCCP removal methods are expensive, require severe operating conditions, involve time-consuming biological treatment, and have poor removal specificities. Therefore, it is important to seek efficient methods to remove SCCPs. In this paper, a pressurized reactor was introduced, and the removal performance of SCCPs by Escherichia coli strain 2 was investigated. The results indicated that moderate pure oxygen pressurization promoted bacterial growth, but when it exceeded 0.15 MPa, the bacterial growth was severely inhibited. When the concentration of SCCPs was 20 mg/L, the removal rate of SCCPs was 85.61% under 0.15 MPa pure oxygen pressurization for 7 days, which was 25% higher than at atmospheric pressure (68.83%). In contrast, the removal rate was only 69.28% under 0.15 MPa air pressure. As the pressure continued to increase, the removal rate of SCCPs decreased significantly. The total amount of extracellular polymeric substances (EPS) increased significantly upon increasing the pressure, and the amount of tightly bound EPS (TB-EPS) was higher than that of loosely bound EPS (LB-EPS). The pressure mainly promoted the secretion of proteins in LB-EPS. Furthermore, an appropriate pure oxygen pressure of 0.15 MPa improved the dehydrogenase activity. The gas chromatography–mass spectrometry (GC–MS) results indicated that the degradation pathway possibly involved the cleavage of the C–Cl bond in SCCPs, which produced Cl−, followed by C–C bond breaking. This process degraded long-chain alkanes into short-chain alkanes. Moreover, the main degradation products detected were 2,4-dimethylheptane (C9H20), 2,5-dimethylheptane (C9H20), and 3,3-dimethylhexane (C8H18).

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“…Because of that, in order to obtain a cheaper method and more easily integrated with other technologies, the use of zero valent iron (ZVI) in combination with electrolysis has emerged as a promising alternative. Successful results in the dechlorination were reported for short chain chlorinated paraffins [24], lindane [25] or trichloroethene [26], with studies included the evaluation of the intermediates generated and the possible degradation pathways. Regarding electrochemical processes, in previous works of our group about the combination of this technology with EAOPs, it was demonstrated that, from the viewpoint of electrochemical treatment, a pre-treatment with ZVI does not show important advantages regardless of the electrode material used and the size of the ZVI particles [27].…”

Section: Introductionmentioning

confidence: 99%

Clopyralid degradation by AOPs enhanced with zero valent iron

Ferreira

Souza

Muñoz-Morales

et al. 2020

Journal of Hazardous Materials

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Dechlorination of short chain chlorinated paraffins by nanoscale zero-valent iron

Cited by 27 publications

References 27 publications

Dechlorination and chlorine rearrangement of 1,2,5,5,6,9,10-heptachlorodecane mediated by the whole pumpkin seedlings

Dechlorination and chlorine rearrangement of 1,2,5,5,6,9,10-heptachlorodecane mediated by the whole pumpkin seedlings

Effects of Pressurized Aeration on the Biodegradation of Short-Chain Chlorinated Paraffins by Escherichia coli Strain 2

Clopyralid degradation by AOPs enhanced with zero valent iron

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