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Synthesis of Poly(methacrylic acid)/Montmorillonite Hydrogel Nanocomposite for Efficient Adsorption of Amoxicillin and Diclofenac from Aqueous Environment: Kinetic, Isotherm, Reusability, and Thermodynamic Investigations.
ACS Omega ( IF 4.1 ) Pub Date : 2020-02-05 , DOI: 10.1021/acsomega.9b03617
Suhail Ayoub Khan 1 , Mohammad Fuzail Siddiqui 1 , Tabrez Alam Khan 1
Affiliation  

Herein, a simplistic redox polymerization strategy was utilized for the fabrication of a poly(methacrylic acid)/montmorillonite hydrogel nanocomposite (PMA/nMMT) and probed as a sorbent for sequestration of two pharmaceutical contaminants, viz., amoxicillin (AMX) and diclofenac (DF), from wastewater. The synthesized hydrogel nanocomposite was characterized by the Fourier transform infrared, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy-energy dispersive X-ray spectroscopy, and transmission electron microscopy techniques to analyze structural characteristics and sorption interactions. The efficacy of PMA/nMMT was thoroughly investigated for the sequestration of AMX and DF from the aquatic phase with a variation in operative variables like agitation time, sorbent dosage, pH, and initial sorbate concentration. The reaction kinetics was essentially consistent with the pseudo-second-order model with rate dominated by the intraparticle diffusion model as well as the film diffusion mechanism. The Freundlich isotherm appropriated the equilibrium data over the entire range of concentration. Thermodynamic investigation explored the spontaneous and endothermic nature of the process. The most possible mechanism has been explained, which includes electrostatic interaction, hydrogen bonding, cationic exchange, and partition mechanism. Economic feasibility, better sorption capacity (152.65 for AMX and 152.86 mg/g for DF), and efficient regeneration and reusability even after four consecutive sorption-desorption cycles ascertained PMA/nMMT as a potential sorbent for AMX and DF uptake from the aqueous phase.

中文翻译:

水性环境中阿莫西林和双氯芬酸高效吸附的聚(甲基丙烯酸)/蒙脱土水凝胶纳米复合材料的动力学,等温线,可重复使用性和热力学研究。

本文采用简单的氧化还原聚合策略制备聚甲基丙烯酸/蒙脱土水凝胶纳米复合材料(PMA / nMMT),并作为吸附剂用于螯合两种药物污染物,即阿莫西林(AMX)和双氯芬酸( DF),来自废水。合成的水凝胶纳米复合材料的特征在于傅立叶变换红外光谱,X射线衍射,X射线光电子能谱,扫描电子显微镜-能量色散X射线光谱以及透射电子显微镜技术来分析结构特征和吸附相互作用。彻底研究了PMA / nMMT在水相中螯合AMX和DF的功效,并改变了操作变量,如搅拌时间,吸附剂剂量,pH和初始山梨酸盐浓度。反应动力学与假二阶模型基本一致,其速率主要由颗粒内扩散模型和膜扩散机理决定。Freundlich等温线适用于整个浓度范围内的平衡数据。热力学研究探索了该过程的自发性和吸热性。已经解释了最可能的机理,包括静电相互作用,氢键,阳离子交换和分配机理。经济可行性,更好的吸附能力(AMX为152.65和DF为152.86 mg / g)以及有效的再生和可重复使用性,即使在连续四个吸附-解吸循环后仍可确定PMA / nMMT作为从水相中吸收AMX和DF的潜在吸附剂。
更新日期:2020-02-18
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