The pathway of dechlorination of PCB congener by a photochemical chain process in 2-propanol: The role of medium and quenching

Izadifard, Maryam; Achari, Gopal; Langford, Cooper H.

doi:10.1016/j.chemosphere.2008.07.003

Cited by 19 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slow rate of dechlorination in the open system can be attributed to the oxygen quenching of the electron transfer agent (CH 3 )CO •− , which is generated in an irradiated alkaline IPA system. This result agrees with the findings of 13 where the authors observed that (CH 3 ) 2 CO •− was quenched in an aerated system and consequently the rate was slower.…”

Section: Resultssupporting

confidence: 92%

“…Therefore the dechlorination can be attributed to the electron transfer from (CH 3 ) 2 CO •− that is being produced via band‐gap illumination of TiO 2 in basic IPA. A similar kind of product distribution has been reported 13, during the photolysis of PCB‐138 in an alkaline IPA system. The authors reported this type of product distribution as the result of direct electron transfer from (CH 3 ) 2 CO •− to PCB‐138 in a deaerated system.…”

Section: Resultssupporting

confidence: 80%

See 1 more Smart Citation

Reductive Dechlorination of PCBs Using Photocatalyzed UV Light

Ghosh

Achari

Langford

2012

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

Feasibility of photocatalytic dechlorination of PCB‐138 and Aroclor‐1254 using platinum loaded TiO2 (P25) in an alkaline 2‐propanol medium has been investigated. Experiments were conducted in batch mode using a Rayonet photo‐reactor under aerated and deaerated conditions with black lamps emitting around 350 nm as light source. Two forms of platinum deposition were investigated: Photochemically loaded P25 as well as addition of potassium hexachloroplatinate into the reaction medium. Partial dechlorination of PCBs was observed after 7 h of irradiation with pure TiO2 as catalyst when the reaction vessel was kept open to air. Complete dechlorination was observed after 5 h of irradiation in a deaerated environment. Enhanced photocatalytic efficiency was observed when platinum deposited P25 was used as catalyst, with the best result being obtained when aqueous potassium hexachloroplatinate was added into the reaction medium. Lower potassium hexachloroplatinate concentration (0.1 mM) yielded better performance.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 80%

Reductive Dechlorination of PCBs Using Photocatalyzed UV Light

Ghosh

Achari

Langford

2012

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…The hexane phase for each sample was analyzed using an Agilent 6890 series gas chromatograph (GC) with an electron capture detector equipped with a DB-608 column (30 m length, 0.25 mm ID, and 0.25 m film thickness). The GC conditions and the temperature program were chosen as previously reported [12].…”

Section: Photolysis Procedure Sample and Data Analysesmentioning

confidence: 99%

Photocatalytic dechlorination of PCB 138 using leuco-methylene blue and visible light; reaction conditions and mechanisms

Izadifard

Langford

Achari

2010

Journal of Hazardous Materials

Self Cite

View full text Add to dashboard Cite

“…Furthermore, degradation of PBDEs and PCBs is an important concern. PBDEs and PCBs have been shown to break down into lower halogenated congeners by microbial (He et al, 2006;Robrock et al, 2008;Van Aken et al, 2010) and photochemical degradation (Eriksson et al, 2004;Izadifard et al, 2008;Shih and Wang, 2009). However, only a few in vivo studies so far have been performed on debromination of PBDEs or dechlorination of PCBs in plants with very limited congeners, including CB-77 and BDE-209 (Liu and Schnoor, 2008;Huang et al, 2010;Wang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Uptake, translocation and metabolism of polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in maize (Zea mays L.)

Wang¹,

Zhang²,

Huang³

et al. 2011

Chemosphere

100

View full text Add to dashboard Cite

a b s t r a c tA hydroponic experiment was conducted in the present study to investigate and compare plant uptake, translocation and metabolism of polybrominated diphenyl ethers (PBDEs) of BDE-15, BDE-28 and BDE-47 and polychlorinated biphenyls (PCBs) of PCB-15, PCB-28 and PCB-47 in maize. Root concentrations of BDE-15, BDE-28 and BDE-47 were consistently higher than PCB-15, PCB-28 and PCB-47, respectively. A significantly positive correlation was found between log RCF (root concentration factor) and log K ow of these PBDEs and PCBs, suggesting a control role of their partitioning in plant uptake. The translocation factors (TFs, C stem /C root ) of PBDEs were generally lower than those of PCBs of the same halogen-substitutions, demonstrating easier transport of PCBs than PBDEs. Metabolites mono-, di-and tri-BDEs and PCBs were detected, suggesting the existence of in vivo metabolism of PBDEs and PCBs in maize. Dehalogenation and rearrangement of halogen atoms were identified, and some similarities but also significant differences existed between the PBDEs and PCBs. PBDEs in maize were, in general, more susceptible to metabolism compared with PCBs of the same halogen-substitutions. This is the first comparative report on the uptake, translocation and metabolism of PBDEs and PCBs in plants.

show abstract

The pathway of dechlorination of PCB congener by a photochemical chain process in 2-propanol: The role of medium and quenching

Cited by 19 publications

References 14 publications

Reductive Dechlorination of PCBs Using Photocatalyzed UV Light

Reductive Dechlorination of PCBs Using Photocatalyzed UV Light

Photocatalytic dechlorination of PCB 138 using leuco-methylene blue and visible light; reaction conditions and mechanisms

Uptake, translocation and metabolism of polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in maize (Zea mays L.)

Contact Info

Product

Resources

About