Abstract
The effect of temperature on 2,4-dichlorophenol (DCP) degradation by Fenton's reagent was investigated at 25 and 70 C in order to assess eventual advantages associated with higher temperature. The results obtained at 70 C indicated that DCP removal and dechlorination were achieved in about 20 min and 69% of TOC was mineralized in 120 min. As expected, at 25 C, all the above processes were slower. In fact, after 120 min: about 10% of DCP was still present, DCP dechlorination was around 74% and the amount of removed TOC was only 19%. Several intermediates, mainly aromatic, were identified at both temperatures allowing to propose two mechanisms for their formation. The first one begins with an ipso substitution of DCP benzene ring and continues by hydroxylation and coupling reactions to form chloro-hydroxy-diphenyl ethers. The second mechanism involves consecutive hydroxylations and coupling reactions leading to chloro-hydroxy-diphenyl ethers and hydroxy-chlorodibenzo-pdioxins. All these chlorinated by-products were transient at 70 C but rather stable at 25 C. This permits to undergo a successive biological degradation only to the mixture resulting from the treatment carried out at 70 C. Such a high temperature could be maintained, avoiding the costs of external heating, by exploiting the intrinsic
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Lopez, A;
Mascolo, G;
Detomaso, A;
Lovecchio, G;
Ciannarella, R;
[1]
Curci, R
[2]
- Inst. di Ricerca Sulle Acque, Consiglio Nazionale delle Ricerche, Bari (Italy)
- Dipt. di Chimica, Univ. di Bari, Bari (Italy)
Citation Formats
Lopez, A, Mascolo, G, Detomaso, A, Lovecchio, G, Ciannarella, R, and Curci, R.
Temperature effect on 2,4-dichlorophenol degradation by Fenton's reagent.
Germany: N. p.,
2003.
Web.
Lopez, A, Mascolo, G, Detomaso, A, Lovecchio, G, Ciannarella, R, & Curci, R.
Temperature effect on 2,4-dichlorophenol degradation by Fenton's reagent.
Germany.
Lopez, A, Mascolo, G, Detomaso, A, Lovecchio, G, Ciannarella, R, and Curci, R.
2003.
"Temperature effect on 2,4-dichlorophenol degradation by Fenton's reagent."
Germany.
@misc{etde_20475813,
title = {Temperature effect on 2,4-dichlorophenol degradation by Fenton's reagent}
author = {Lopez, A, Mascolo, G, Detomaso, A, Lovecchio, G, Ciannarella, R, and Curci, R}
abstractNote = {The effect of temperature on 2,4-dichlorophenol (DCP) degradation by Fenton's reagent was investigated at 25 and 70 C in order to assess eventual advantages associated with higher temperature. The results obtained at 70 C indicated that DCP removal and dechlorination were achieved in about 20 min and 69% of TOC was mineralized in 120 min. As expected, at 25 C, all the above processes were slower. In fact, after 120 min: about 10% of DCP was still present, DCP dechlorination was around 74% and the amount of removed TOC was only 19%. Several intermediates, mainly aromatic, were identified at both temperatures allowing to propose two mechanisms for their formation. The first one begins with an ipso substitution of DCP benzene ring and continues by hydroxylation and coupling reactions to form chloro-hydroxy-diphenyl ethers. The second mechanism involves consecutive hydroxylations and coupling reactions leading to chloro-hydroxy-diphenyl ethers and hydroxy-chlorodibenzo-pdioxins. All these chlorinated by-products were transient at 70 C but rather stable at 25 C. This permits to undergo a successive biological degradation only to the mixture resulting from the treatment carried out at 70 C. Such a high temperature could be maintained, avoiding the costs of external heating, by exploiting the intrinsic exothermicity of the Fenton reaction through the control of H{sub 2}O{sub 2} addition rate. (orig.)}
place = {Germany}
year = {2003}
month = {Jul}
}
title = {Temperature effect on 2,4-dichlorophenol degradation by Fenton's reagent}
author = {Lopez, A, Mascolo, G, Detomaso, A, Lovecchio, G, Ciannarella, R, and Curci, R}
abstractNote = {The effect of temperature on 2,4-dichlorophenol (DCP) degradation by Fenton's reagent was investigated at 25 and 70 C in order to assess eventual advantages associated with higher temperature. The results obtained at 70 C indicated that DCP removal and dechlorination were achieved in about 20 min and 69% of TOC was mineralized in 120 min. As expected, at 25 C, all the above processes were slower. In fact, after 120 min: about 10% of DCP was still present, DCP dechlorination was around 74% and the amount of removed TOC was only 19%. Several intermediates, mainly aromatic, were identified at both temperatures allowing to propose two mechanisms for their formation. The first one begins with an ipso substitution of DCP benzene ring and continues by hydroxylation and coupling reactions to form chloro-hydroxy-diphenyl ethers. The second mechanism involves consecutive hydroxylations and coupling reactions leading to chloro-hydroxy-diphenyl ethers and hydroxy-chlorodibenzo-pdioxins. All these chlorinated by-products were transient at 70 C but rather stable at 25 C. This permits to undergo a successive biological degradation only to the mixture resulting from the treatment carried out at 70 C. Such a high temperature could be maintained, avoiding the costs of external heating, by exploiting the intrinsic exothermicity of the Fenton reaction through the control of H{sub 2}O{sub 2} addition rate. (orig.)}
place = {Germany}
year = {2003}
month = {Jul}
}