TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2

ABSTRACT Ozone is a strong oxidant used in the water treatment to remove organochloride compounds. Given that many processes of degradation generate chemical compounds that are more toxic than initial compounds, the development of optimized ozonation processes are required. In this study, pentachlor...

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Autores principales:	Quispe,Cristina, Valdés,Cristian, Delgadillo,Alvaro, Villaseñor,Jorge, Cheel,José, Pecchi,Gina
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2018
Materias:	Pentachlorophenol (PCP) catalytic ozonation MnO2/TiO2 toxicity assays Lactuca sativa Panicum millaceum Daphnia magna
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072018000304090
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spelling	oai:scielo:S0717-970720180003040902018-10-03TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2Quispe,CristinaValdés,CristianDelgadillo,AlvaroVillaseñor,JorgeCheel,JoséPecchi,Gina Pentachlorophenol (PCP) catalytic ozonation MnO2/TiO2 toxicity assays Lactuca sativa Panicum millaceum Daphnia magna ABSTRACT Ozone is a strong oxidant used in the water treatment to remove organochloride compounds. Given that many processes of degradation generate chemical compounds that are more toxic than initial compounds, the development of optimized ozonation processes are required. In this study, pentachlorophenol (PCP) was used as a model of an organochlorine compound and the toxicity of its degradation products generated by both non-catalytic and catalytic ozonation processes were evaluated with a fresh-water Daphnia magna (ecotoxicity) and vegetables species Lactuca sativa and Panicum millaceum (Phytoxicity). The catalytic ozonation used MnO2/TiO2 as catalyst, which was characterized by X-ray diffraction analysis showing the presence of crystalline TiO2 phases, rutile and anatase. The specific BET surface area of MnO2/TiO2 was 43 m2/g. It was found that the use of ozone as an oxidant showed a first order degradation rate constant (kobs = 0.5 ± 0.1 min-1). The uncatalyzed reaction showed several reaction intermediates like mono- and polychlorinated phenols, and quinones. The oxidation of these compounds led to low molecular weight organic acids. From these results, we proposed a pathway of PCP degradation using ozone. The catalyzed reaction showed a more potent effect in reducing the toxicity of the treated solution. Unlike the use of only ozone which does not decrease the toxicity. It was found that the treatment with catalytic ozonation decreases the toxicity of the solutions.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.63 n.3 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072018000304090en10.4067/s0717-97072018000304090
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Pentachlorophenol (PCP) catalytic ozonation MnO2/TiO2 toxicity assays Lactuca sativa Panicum millaceum Daphnia magna
spellingShingle	Pentachlorophenol (PCP) catalytic ozonation MnO2/TiO2 toxicity assays Lactuca sativa Panicum millaceum Daphnia magna Quispe,Cristina Valdés,Cristian Delgadillo,Alvaro Villaseñor,Jorge Cheel,José Pecchi,Gina TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2
description	ABSTRACT Ozone is a strong oxidant used in the water treatment to remove organochloride compounds. Given that many processes of degradation generate chemical compounds that are more toxic than initial compounds, the development of optimized ozonation processes are required. In this study, pentachlorophenol (PCP) was used as a model of an organochlorine compound and the toxicity of its degradation products generated by both non-catalytic and catalytic ozonation processes were evaluated with a fresh-water Daphnia magna (ecotoxicity) and vegetables species Lactuca sativa and Panicum millaceum (Phytoxicity). The catalytic ozonation used MnO2/TiO2 as catalyst, which was characterized by X-ray diffraction analysis showing the presence of crystalline TiO2 phases, rutile and anatase. The specific BET surface area of MnO2/TiO2 was 43 m2/g. It was found that the use of ozone as an oxidant showed a first order degradation rate constant (kobs = 0.5 ± 0.1 min-1). The uncatalyzed reaction showed several reaction intermediates like mono- and polychlorinated phenols, and quinones. The oxidation of these compounds led to low molecular weight organic acids. From these results, we proposed a pathway of PCP degradation using ozone. The catalyzed reaction showed a more potent effect in reducing the toxicity of the treated solution. Unlike the use of only ozone which does not decrease the toxicity. It was found that the treatment with catalytic ozonation decreases the toxicity of the solutions.
author	Quispe,Cristina Valdés,Cristian Delgadillo,Alvaro Villaseñor,Jorge Cheel,José Pecchi,Gina
author_facet	Quispe,Cristina Valdés,Cristian Delgadillo,Alvaro Villaseñor,Jorge Cheel,José Pecchi,Gina
author_sort	Quispe,Cristina
title	TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2
title_short	TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2
title_full	TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2
title_fullStr	TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2
title_full_unstemmed	TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2
title_sort	toxicity studies during the degradation of pentachlorophenol by ozonation in the presence of mno2/tio2
publisher	Sociedad Chilena de Química
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072018000304090
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TOXICITY STUDIES DURING THE DEGRADATION OF PENTACHLOROPHENOL BY OZONATION IN THE PRESENCE OF MnO2/TiO2

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