Photocatalysis of 2,2′,3,4,4′,5′-hexachlorobiphenyl and its intermediates using various catalytical preparing methods

Lin, Yaw-Jian; Chen, Y L; Huang, Chun-Hong; Wu, Ming‐Chang

doi:10.1016/j.jhazmat.2006.01.031

Cited by 21 publications

(13 citation statements)

References 37 publications

(54 reference statements)

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“…Similarly, the overall lower PCB decay observed in the TX effluents may be ascribed to their higher content of soil eluted organic constituents which, according to previous findings (Chu et al, 1998(Chu et al, , 2005, could significantly ''quench'' the performance of photocatalytic treatment. This is probably also the reason of the lower PCB degradation rates and extents observed in this work on high TOC effluents with respect to those observed in other studies performed on distilled water or simple aqueous solutions of defined mixtures of PCBs (Chu et al, 2005;Lin et al, 2006;Nomiyama et al, 2005;Wong KH et al, 2004). The depletion of TOC was generally lower and slower than that of total PCBs (Fig.…”

Section: Discussionsupporting

confidence: 51%

“…These effluents might be decontaminated through photocatalytic treatments based on the use of dispersed or fixed-bed TiO 2 catalysts. Indeed, such treatments have been found able to efficiently destroy a variety of (chlorinated) organic compounds (Huang et al, 1996;Zhang et al, 1994), including PCBs (De Felip et al, 1996;Huang et al, 1996;Lin et al, 2006;Wong KH et al, 2004), occurring in synthetic and real industrial wastewaters. However, a little is currently known about their efficiency in the remediation of the contaminated streams resulting from soil washing operations (Maillacheruvu et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Sustainable decontamination of an actual‐site aged PCB‐polluted soil through a biosurfactant‐based washing followed by a photocatalytic treatment

Occulti

Roda

Berselli

et al. 2007

Biotech & Bioengineering

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A two phases process consisting of a soya lecithin (SL)-based soil washing process followed by the photocatalytic treatment of resulting effluents was developed and applied at the laboratory scale in the remediation of an actual-site soil historically contaminated by 0.65 g/kg of polychlorinated biphenyls (PCBs). Triton X-100 (TX) was employed in the same process as a control surfactant. SL and TX, both applied as 2.25 g/L aqueous solutions, displayed a comparable ability to remove PCBs from the soil. However, SL solution displayed a lower ecotoxicity, a lower ability to mobilize soil constituents and a higher soil detoxification capacity with respect to the TX one. The photocatalytic treatment resulted in marked depletions (from 50% to 70%) of total organic carbon (TOC) and PCBs initially occurring in the SL and TX contaminated effluents. Despite the ability of SL to adversely affect the rate of TOC and PCB photodegradation, higher PCB depletion and dechlorination yields along with lower increases of ecotoxicity were observed in SL-containing effluents with respect to the TX ones at the end of 15 days of treatment. The two phases process developed and tested for the first time in this study seems to have the required features to become, after a proper optimization and scale up, a challenging procedure for the sustainable remediation of actual site, poorly biotreatable PCB-contaminated soils.

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Section: Discussionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Sustainable decontamination of an actual‐site aged PCB‐polluted soil through a biosurfactant‐based washing followed by a photocatalytic treatment

Occulti

Roda

Berselli

et al. 2007

Biotech & Bioengineering

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“…Hydroxyl radical activation barriers this high are generally associated with reactions that do not readily occur at room temperature [27]. For example, activation energies for HO reaction with perchlorinated biphenyls (PCBs) range from 71 to 93 kJ mol -1 [28,29]. These high activation energies explain the lack of PCB ) E a = 9.3 ±3 kJ mol -1 Fig.…”

Section: Quantum Mechanical Simulationsmentioning

confidence: 99%

Electrochemical oxidation of perfluorobutane sulfonate using boron-doped diamond film electrodes

Liao

Farrell

2009

J Appl Electrochem

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This research investigated oxidation of perfluorobutane sulfonate (PFBS) at a boron-doped diamond (BDD) film anode. PFBS oxidation produced carbon dioxide, sulfate, fluoride, and trace amounts of trifluoroacetic acid (TFA). Rate constants for PFBS oxidation as a function of current density and temperature were measured using a rotating disk electrode (RDE) reactor. Reaction rates in the RDE reactor were zeroth order with respect to PFBS concentration, which is indicative of a reaction limited by the availability of reactive sites. The apparent electron transfer coefficient and apparent activation energy were used to evaluate the rate-limiting step for PFBS oxidation. Density functional simulations were used to calculate the reaction energies and activation barriers for PFBS oxidation by hydroxyl radicals and by direct electron transfer. Simulation results indicated that the experiments were performed at sufficiently high overpotentials that the rate-limiting step was an activationless direct electron transfer reaction.

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“…Therefore, it is logical to assume that increasing the dose of hydrogen peroxide would increase the transient-state concentration of hydrogen peroxide. This is not the case though, because hydrogen peroxide acts as a hydroxyl radical scavenger too [10][11][12][13]. It is obvious that at low initial hydrogen peroxide concentrations, increasing the dose signifi cantly increases the degradation rate of the PCBs.…”

Section: Effect Of Hydrogen Peroxidementioning

confidence: 99%

“…For several decades, PCBs have been used in a wide range of industrial applications because of their excellent physical and chemical properties, such as: oil in transformers, dielectrics in capacitors, hydraulic fl uids in hydraulic tools and equipment and heat exchange liquids [3,4]. PCBs also found widespread use as lubricants for turbines and pumps, in the formulation of cutting oils for metal treatment, and to a lesser extent, in applications such as adhesives, carbonless copy paper, dyes, pesticides, surface coatings, plasticizers and waxes [2][3][4][5][6][7][8][9][10][11][12][13]. Polychlorinated biphenyls are toxic, persistent, bio-accumulative and pose a risk of causing adverse effects to human health and the environment.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Solvent, Hydrogen Peroxide and Dioxide Titanium on Degradation of PCBs, Using Microwave Radiation in Order to Reduce Occupational Exposure

Tajik¹,

Mohabadi²,

Khavanin³

et al. 2014

Archives of Environmental Protection

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Polychlorinated biphenyls (PCBs) are one group of persistent organic pollutants (POPs) that are of international concern because of global distribution, persistence, and toxicity. Removal of these compounds from the environment remains a very diffi cult challenge because the compounds are highly hydrophobic and have very low solubility in water. A 900 W domestic microwave oven, pyrex vessel reactor, pyrex tube connector and condensing system were used in this experiment. Radiation was discontinuous and ray powers were 540, 720 and 900 W. The PCB S were analyzed by GC-ECD. The application of microwave radiation and H 2 O 2 /TiO 2 agents for the degradation of polychlorinated biphenyl contaminated oil was explored in this study. PCB -contaminated oil was treated in a pyrex reactor by microwave irradiation at 2450 MHz with the addition of H 2 O 2 /TiO 2 . A novel grain TiO 2 (GT01) was used. The determination of PCB residues in oil by gas chromatography (GC) revealed that rates of PCB decomposition were highly dependent on microwave power, exposure time, ratio to solvent with transformer oil in 3:1, the optimal amount of GT01 (0.2 g) and 0.116 mol of H 2 O 2 were used in the study. It was suggested that microwave irradiation with the assistance of H 2 O 2 /TiO 2 might be a potential technology for the degradation of PCB -contaminated oil. The experiments show that MW irradiation, H 2 O 2 oxidant and TiO 2 catalyst lead to a degradation effi ciency of PCBs only in the presence of ethanol. The results showed that the addition of ethanol signifi cantly enhanced degradation effi ciency of PCBs.

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Photocatalysis of 2,2′,3,4,4′,5′-hexachlorobiphenyl and its intermediates using various catalytical preparing methods

Cited by 21 publications

References 37 publications

Sustainable decontamination of an actual‐site aged PCB‐polluted soil through a biosurfactant‐based washing followed by a photocatalytic treatment

Sustainable decontamination of an actual‐site aged PCB‐polluted soil through a biosurfactant‐based washing followed by a photocatalytic treatment

Electrochemical oxidation of perfluorobutane sulfonate using boron-doped diamond film electrodes

The Effect of Solvent, Hydrogen Peroxide and Dioxide Titanium on Degradation of PCBs, Using Microwave Radiation in Order to Reduce Occupational Exposure

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