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Căutarea după subiecte similare conform CZU |
54.06:676.08 (1) |
Analiză, investigae și manipulare în general (25) |
Industria celulozei, hârtiei și a cartonului (9) |
SM ISO690:2012 LUNG, Ildiko, SORAN, Maria-Loredana, STEGARESCU, Adina, OPRIȘ, Ocsana-Ileana. Application of CNT-COOH/MnO2/Fe3O4 nanocomposite for the removal of cymoxanil from aqueous solution. In: Ecological and environmental chemistry : - 2022, Ed. 7, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, Ediția 7, Vol.1, p. 115. ISBN 978-9975-159-07-4.. 10.19261/eec.2022.v1 |
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Ecological and environmental chemistry Ediția 7, Vol.1, 2022 |
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Conferința "Ecological and environmental chemistry 2022" 7, Chișinău, Moldova, 3-4 martie 2022 | |
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CZU: 54.06:676.08 | |
Pag. 115-115 | |
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Rezumat | |
In the last years, water pollution and pesticides accumulation in food chain have become a serious environmental and health problems. In agriculture, the pesticides are intensively used due to their capacity to control and eradicated insects, fungi, bacteria, weeds, worms, rodents and other pests. Their constant use results in obtaining healthy and high yield crops but, on the other hand, over time, leads to their accumulation in soil and water with irreversible effects on the environment and health. For this reason, it is imperative to constantly monitor their concentration in the environment and aquatic media. To improve the extraction of pesticides, new methods and materials are constantly developed. A very promising material are multi walled carbon nanotubes, alone or in combination with other nanomaterials, due to their highly porous and hollow structures, high surface area, thermal stability, high mechanical strength in tension, good thermal conductivity, electrical conductivity, optical activity, mechanical damage resistance and a strong ability to establish π– π interactions with the pesticides or other organic materials. Cymoxanil, [1-(2-cyano-2-methoxyiminoacetyl)-3-ethylurea], is an aliphatic nitrogen fungicide, with promising effect like fungicide, alone or in combination with other fungicides, against grape downy mildew, tomato and pepper bacterial spot and lettuce bacterial leaf spot due to his high efficiency, low toxicity and curative activity on plants, but with a lake of literature about the long-time toxicity of cymoxanil accumulation. The present study evaluates the efficiency of the cymoxanil adsorption on CNT-COOH/MnO2/Fe3O4 nanocomposite. The optimal conditions were established studying the influence of pH (2-10), temperature (20-60°C), initial cymoxanil concentration (7-20 mg L-1), adsorbent dose (0.5-5 g L-1) and contact time (2-30 min) on adsorption process. Isotherms and kinetic models were used to analyze the experimental data. Among the used isotherms, the Langmuir isotherm model provides the best fit for experimental data. The maximum adsorption capacity of cymoxanil on studied nanocomposite was 10.672 mg g-1. Also, cymoxanil adsorption follows the pseudo-second order kinetic model. According to the experimental results, CNT-COOH/MnO2/Fe3O4 nanocomposite can be used for cymoxanil removal from aqueous solution. Acknowledgments: This work was carried out through the Romanian Ministry of Research, Innovation and Digitization within the Core Program, PN19-35-0203 (36N/13.02.2019). |
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