Department of Chemistry, Faculty of Sciences, Lorestan University , Khorram Abad, Iran.
J Agric Food Chem. 2014 May 28;62(21):4833-8. doi: 10.1021/jf404720d. Epub 2014 May 15.
Polymerization of citric acid onto the surface of oxidized multiwall carbon nanotubes led to MWCNT-graft-poly(citric acid) (MWCNT-g-PCA) hybrid materials. Because of the presence of conjugated citric acid branches, synthesized MWCNT-g-PCA hybrid materials were not only soluble in water but also able to trap water-soluble chemical species and metal ions. Trapping of pesticides such as zineb and mancozeb in aqueous solution by MWCNT-g-PCA hybrid materials led to encapsulated pesticide (EP) in the polycitric acid shell. Optimum conditions for encapsulation of zineb and mancozeb in hyperbranched polycitric acid such as pH, time of stirring, and temperature were investigated by the UV-vis spectroscopy method. Encapsulation of pesticides on CNT-g-PCA hybrid material was confirmed via TEM analysis. Experiments indicated that new the CNT-g-PCA-EP hybrid material in comparison with bulk pesticide had a superior toxic influence on Alternaria alternata fungi.
柠檬酸在氧化多壁碳纳米管表面的聚合导致了 MWCNT-g-PCA（MWCNT-g-PCA）杂化材料的形成。由于存在共轭柠檬酸支链，合成的 MWCNT-g-PCA 杂化材料不仅在水中可溶，而且能够捕获水溶性化学物质和金属离子。MWCNT-g-PCA 杂化材料在水溶液中捕获农药如代森锌和代森锰后，在多聚柠檬酸壳内形成包裹农药（EP）。通过紫外可见光谱法研究了在超支化聚柠檬酸中包埋代森锌和代森锰的最佳条件，如 pH 值、搅拌时间和温度。通过 TEM 分析证实了在 CNT-g-PCA 杂化材料上的农药包埋。实验表明，与散装农药相比，新型 CNT-g-PCA-EP 杂化材料对链格孢真菌Alternaria alternata 具有更强的毒性影响。
