Humic acid and metal ions accelerating the dechlorination of 4-chlorobiphenyl by nanoscale zero-valent iron

Zhou

et al. 2011

Environ Sci Pollut Res

Self Cite

Section: Introductionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Automatic pH control system enhances the dechlorination of 2,4,4′-trichlorobiphenyl and extracted PCBs from contaminated soil by nanoscale Fe0 and Pd/Fe0

Zhou

et al. 2011

Environ Sci Pollut Res

Self Cite

Chemical Engineering Journal

“…HA can compete with organic pollutants to react with reactive species and lower the degradation rates. In addition, the hydrophobic layer formed by HA is adsorbed onto the surface of ZVI [43]. Furthermore, the complexes or colloids between HA and the generated iron ions may inhibit the corrosion of ZVI.…”

Section: Effect Of Hamentioning

confidence: 99%

“…Furthermore, the complexes or colloids between HA and the generated iron ions may inhibit the corrosion of ZVI. Consequently, SO 4 ÅÀ forms at a slow rate, and the degradation efficiency of the ZVI-PS system declines [43,44].…”

Section: Effect Of Hamentioning

confidence: 99%

Degradation of chloramphenicol by persulfate activated by Fe 2+ and zerovalent iron

Nie

Yan

et al. 2015

201

h i g h l i g h t sThe removal efficiencies for CAP in water by PS activated by Fe 2+ and ZVI were studied.CAP was effectively removed by the ZVI-PS system at a broad pH range of 3-10. CAP removal was significantly influenced by operational parameters.The ZVI-PS system shows potential prospects in wastewater or even concentrated wastewater treatment. An oxidation pathway was proposed for CAP removal by the ZVI-PS system. a r t i c l e i n f o , and HA significantly inhibited CAP decomposition. Up to 92.8%, 94.7%, and 75.7% of CAP were removed from the filtrate, permeate, and retentate phases of wastewater, respectively. This result indicated that the ZVI-PS system can significantly remove CAP from wastewater and even concentrated wastewater. The intermediate products during oxidation were identified, and the degradation pathways of CAP were tentatively proposed.

Int. J. Environ. Sci. Technol.

“…In some instances, the presence of heavy metals can be used as an advantage because it can be utilized as a source of a second metal which leads to the in situ formation of bimetallic iron nanoparticles when monometallic iron nanoparticle were implemented (Lien et al 2007). Wang et al (2011a) found that in the presence of certain metals, dechlorination increased. Divalent metal ions, Co 2?…”

Section: Use Of Zero-valent Iron For Remediationmentioning

confidence: 99%

Co-contamination of water with chlorinated hydrocarbons and heavy metals: challenges and current bioremediation strategies

Arjoon

Olaniran

Pillay

2012

Chlorinated hydrocarbons can cause serious environmental and human health problems as a result of their bioaccumulation, persistence and toxicity. Improper disposal practices or accidental spills of these compounds have made them common contaminants of soil and groundwater. Bioremediation is a promising technology for remediation of sites contaminated with chlorinated hydrocarbons. However, sites co-contaminated with heavy metal pollutants can be a problem since heavy metals can adversely affect potentially important biodegradation processes of the microorganisms. These effects include extended acclimation periods, reduced biodegradation rates, and failure of target compound biodegradation. Remediation of sites co-contaminated with chlorinated organic compounds and toxic metals is challenging, as the two components often must be treated differently. Recent approaches to increasing biodegradation of organic compounds in the presence of heavy metals include the use of dual bioaugmentation; involving the utilization of heavy metal-resistant bacteria in conjunction with an organicdegrading bacterium. The use of zero-valent irons as a novel reductant, cyclodextrin as a complexing agent, renewable agricultural biosorbents as adsorbents, biosurfactants that act as chelators of the co-contaminants and phytoremediation approaches that utilize plants for the remediation of organic and inorganic compounds have also been reported. This review provides an overview of the problems associated with co-contamination of sites with chlorinated organics and heavy metals, the current strategies being employed to remediate such sites and the challenges involved.