Department of Chemical Engineering, Arak Branch, Islamic Azad University, Arak, Iran.
Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
PLoS One. 2021 Jan 22;16(1):e0245583. doi: 10.1371/journal.pone.0245583. eCollection 2021.
In this study, porous methacrylate-modified FDU-12/poly(methyl methacrylate) and amine-modified FDU-12/Nylon 6 nanocomposites were synthesized via a facile solution casting protocol. The physicochemical properties of the prepared materials were studied using various characterization techniques including Fourier transform-infrared spectroscopy, field emission-scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption/desorption. After characterization of the materials, the prepared nanocomposites were applied as novel adsorbents for the removal of Pb(II) from aqueous media. In this regard, the effect of various parameters including solution pH, adsorbent amount, contact time, and initial concentration of Pb(II) on the adsorption process was investigated. To study the mechanism of adsorption, kinetic studies were conducted. The kinetic models of pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion were employed. The results revealed that the adsorption of Pb(II) onto methacrylate-modified FDU-12/poly(methyl methacrylate) and amine-modified FDU-12/Nylon 6 adsorbents followed the pseudo-second-order kinetic model. Also, different isotherms including Langmuir, Freundlich, and Dubinin-Radushkevich were applied to evaluate the equilibrium adsorption data. Langmuir isotherm provided the best fit with the equilibrium data of both adsorbents with maximum adsorption capacities of 99.0 and 94.3 mg g-1 for methacrylate-modified FDU-12/poly(methyl methacrylate) and amine-modified FDU-12/Nylon 6, respectively, for the removal of Pb(II).
在这项研究中，通过简单的溶液浇铸法合成了多孔甲基丙烯酸酯修饰的 FDU-12/聚甲基丙烯酸甲酯和胺修饰的 FDU-12/尼龙 6 纳米复合材料。使用各种特性化技术，包括傅里叶变换红外光谱、场发射扫描电子显微镜、透射电子显微镜和氮气吸附/解吸，研究了所制备材料的物理化学性质。在对材料进行特性化之后，将制备的纳米复合材料用作从水介质中去除 Pb(II)的新型吸附剂。在这方面，研究了各种参数对吸附过程的影响，包括溶液 pH 值、吸附剂用量、接触时间和 Pb(II)的初始浓度。为了研究吸附机制，进行了动力学研究。采用伪一级、伪二级、Elovich 和内扩散动力学模型进行了研究。结果表明，Pb(II)在甲基丙烯酸酯修饰的 FDU-12/聚甲基丙烯酸甲酯和胺修饰的 FDU-12/尼龙 6 吸附剂上的吸附遵循伪二级动力学模型。此外，还应用了不同的等温线，包括 Langmuir、Freundlich 和 Dubinin-Radushkevich 来评估平衡吸附数据。Langmuir 等温线与两种吸附剂的平衡数据拟合得最好，甲基丙烯酸酯修饰的 FDU-12/聚甲基丙烯酸甲酯和胺修饰的 FDU-12/尼龙 6 的最大吸附容量分别为 99.0 和 94.3 mg g-1，用于去除 Pb(II)。
