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Insight into carbohydrate polymers (chitosan and 2- hydroxyethyl methacrylate/methyl methacrylate) intercalated bentonite-based nanocomposites as multifunctional and environmental adsorbents for methyl parathion pesticide
International Journal of Biological Macromolecules ( IF 8.2 ) Pub Date : 2020-12-02 , DOI: 10.1016/j.ijbiomac.2020.11.209
Mostafa R. Abukhadra , Ahmed M. El-Sherbeeny , Mohammed A. El-Meligy , Monis Luqman

Two-hybrid products of bentonite intercalated carbohydrate polymers (chitosan (BE.P.CH) and 2- hydroxyethyl methacrylate/methyl methacrylate copolymer (BE/P.HEMA/MMA)) were synthesized as enhanced adsorbents for methyl parathion pesticide (MPP). The intercalation processes induced the affinity and the capacity of bentonite achieving the best value at pH 8. The maximum MPP adsorption capacities of BE (287.3 mg/g), BE/P.CH (634.5 mg/g), and BE/P.HEMA-MMA (868.5 mg/g) obtained after 300 min, 240 min, and 360 min, respectively. The kinetic properties of BE follow the Pseudo-second order behavior (R2 = 0.93) while BE/P.CH and BE/P.HEMA-MMA are of Pseudo-First order behavior (R2 > 0.92). Based on the equilibrium studies, the three products are of Freundlich isotherm behavior (R2 > 0.9) and the uptake is of multilayer forms on heterogeneous surfaces. The Gaussian energies (>8 KJ/mol), Gibbs free energies (>20 to <40 KJ/mol), and enthalpies (>40 to <80 KJ/mol) give an indication about adsorption mechanism involved chemical and physical reactions. The thermodynamics of MPP uptake reactions by the three products are of endothermic and spontaneous behaviors. The MPP uptake in the presence of NH+4, PO4−3, Mn+2, and Pb+2 competitive ions reflects enhancement in the affinity of BE after the integration between it and the selected polymers.



中文翻译:

深入了解碳水化合物聚合物(壳聚糖和甲基丙烯酸2-羟乙酯/甲基丙烯酸甲酯)插入膨润土基纳米复合材料作为甲基对硫磷农药的多功能和环境吸附剂

合成了膨润土插层碳水化合物聚合物的两种混合产物(壳聚糖(BE.P.CH)和甲基丙烯酸2-羟乙酯/甲基丙烯酸甲酯共​​聚物(BE / P.HEMA / MMA)),作为对甲基对硫磷农药(MPP)的增强吸附剂。插层过程使膨润土的亲和力和容量在pH 8下达到最佳值。BE(287.3 mg / g),BE / P.CH(634.5 mg / g)和BE / P的最大MPP吸附容量。在300分钟,240分钟和360分钟后分别获得HEMA-MMA(868.5 mg / g)。BE的动力学性质遵循伪二级行为(R 2  = 0.93),而BE / P.CH和BE / P.HEMA-MMA具有伪一级行为(R 2  > 0.92)。根据平衡研究,这三个乘积分别为Freundlich等温行为(R2  > 0.9),并且吸收是异质表面上的多层形式。高斯能量(> 8 KJ / mol),吉布斯自由能(> 20至<40 KJ / mol)和焓(> 40至<80 KJ / mol)指示了涉及化学和物理反应的吸附机理。三种产物对MPP吸收反应的热力学具有吸热和自发行为。在NH +4,PO 4 -3,Mn +2和Pb +2竞争性离子存在下,MPP的吸收反映了BE与所选聚合物之间的整合后,BE的亲和力增强。

更新日期:2020-12-05
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