Explanation of difenoconazole removal by chitosan with Langmuir adsorption isotherm and kinetic modeling.

IF 1.6 4区医学 Q4 TOXICOLOGY Toxicological Research Pub Date : 2022-10-31 eCollection Date: 2023-01-01 DOI:10.1007/s43188-022-00152-2

Şükran Altun, Ali Eslem Kadak, Aygül Küçükgülmez, Osman Gülnaz, Mehmet Çelik

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引用次数: 2

Abstract

In this study, the adsorption of toxic difenoconazole pesticide was investigated by using chitosan. In the first phase of the study, chitosan was extracted from deep-water pink shrimp (Parapenaeus longirostris) shells, by deacetylation of the chitin, which is separated and disposed of after meat extraction in processing facilities in Turkey. The deacetylation degree, molecular weight, viscosity, moisture, and crude-ash values of the extracted chitosan were determined. Chitosan, having a high deacetylation degree (90.21%), was used as the adsorbent. In the second phase of the study, the effects of pH, temperature, and pesticide concentration on the adsorption were investigated. The optimum pH level for pesticide adsorption was determined as 5. It was observed that the adsorption increases as the temperature increases. A rapid increase was observed within the first 5 min of the 60-minute adsorption process in difenoconazole concentrations of 5, 15, and 25 µg/L, and after 10 min, the adsorption rate was stable. The Langmuir isotherm parameters regarding the adsorption were determined as aL = 0.635, kL = 15.10, and the Q_max value was calculated as 23.77 mg/g. In the evaluation of overall study results, it was determined that the chitosan biopolymer is a suitable adsorbent for difenoconazole pesticide adsorption.

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用朗穆尔吸附等温线和动力学模型解释壳聚糖对苯醚甲环唑的吸附作用。

本研究利用壳聚糖对有毒的苯醚甲环唑杀虫剂进行了吸附研究。在研究的第一阶段，壳聚糖是从深水粉红虾（Parapenaeus longirostris）的壳中通过脱乙酰化提取的。测定了提取壳聚糖的脱乙酰度、分子量、粘度、水分和粗灰分值。高脱乙酰度（90.21%）的壳聚糖被用作吸附剂。第二阶段研究了 pH 值、温度和农药浓度对吸附的影响。吸附农药的最佳 pH 值被确定为 5。在浓度为 5、15 和 25 µg/L 的苯醚甲环唑的 60 分钟吸附过程中，前 5 分钟的吸附率迅速上升，10 分钟后吸附率趋于稳定。吸附的 Langmuir 等温线参数为 aL = 0.635，kL = 15.10，Qmax 值为 23.77 mg/g。在对总体研究结果进行评估时，确定壳聚糖生物聚合物是一种适合吸附苯醚甲环唑农药的吸附剂。

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来源期刊

Toxicological Research TOXICOLOGY-

CiteScore

4.20

自引率

4.30%

发文量

期刊介绍： Toxicological Research is the official journal of the Korean Society of Toxicology. The journal covers all areas of Toxicological Research of chemicals, drugs and environmental agents affecting human and animals, which in turn impact public health. The journal’s mission is to disseminate scientific and technical information on diverse areas of toxicological research. Contributions by toxicologists, molecular biologists, geneticists, biochemists, pharmacologists, clinical researchers and epidemiologists with a global view on public health through toxicological research are welcome. Emphasis will be given to articles providing an understanding of the toxicological mechanisms affecting animal, human and public health. In the case of research articles using natural extracts, detailed information with respect to the origin, extraction method, chemical profiles, and characterization of standard compounds to ensure the reproducible pharmacological activity should be provided.