Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
Institute of Polymeric Materials, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
Environ Sci Pollut Res Int. 2020 Aug;27(22):28091-28103. doi: 10.1007/s11356-020-09127-y. Epub 2020 May 14.
A series of hydrogel nanocomposites was fabricated by in situ polymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) in presence of different amounts of (amine- and alkyl-modified) nanocrystalline cellulose (NCC). Modification and nanocomposites properties were proved by different analysis methods such as Fourier-transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), and field emission scanning electron microscopy (FE-SEM). The new hydrogel nanocomposites were applied for removing methyl orange (MO) used as anionic dye and presented in process water at different pH values. The effects of the fabrication process such as modification and content of NCC, contact time, and pH value on swelling ratio (SR), and equilibrium adsorption kinetics were studied. Results showed that the swelling ratio of PDMAEMA-based nanocomposites varied with the different types of nanoparticles showing the significant effect of the modification process. The MO adsorption into the hydrogel nanocomposites was affected by intermolecular and electrostatic interactions between functional groups of hydrogel and dye. The adsorption capacity decreased at high pH value, and it was significantly affected type of nanoparticles introduced into the hydrogel network. The addition of unmodified NCC did not affect adsorption kinetics significantly. Finally, adsorption kinetics was investigated by pseudo-first-order, pseudo-second-order and intraparticle diffusion models where pseudo-first-order model showed the best correlation with experimental results.
采用原位聚合法制备了一系列水凝胶纳米复合材料，即在不同量的（胺基和烷基改性）纳米纤维素（NCC）存在下聚合 2-（二甲氨基）乙基甲基丙烯酸酯（DMAEMA）。通过傅里叶变换红外光谱（FT-IR）、动态光散射（DLS）和场发射扫描电子显微镜（FE-SEM）等不同分析方法证明了改性和纳米复合材料的性能。将新的水凝胶纳米复合材料应用于去除用作阴离子染料的甲基橙（MO），并在不同 pH 值的工艺水中进行了处理。研究了制备过程（如 NCC 的改性和含量、接触时间和 pH 值）对溶胀比（SR）和平衡吸附动力学的影响。结果表明，基于 PDMAEMA 的纳米复合材料的溶胀比随纳米粒子的不同类型而变化，显示出改性过程的显著影响。水凝胶纳米复合材料对 MO 的吸附受到水凝胶官能团与染料之间的分子间和静电相互作用的影响。在高 pH 值下，吸附容量降低，并且受到引入水凝胶网络的纳米粒子类型的显著影响。未改性 NCC 的添加对吸附动力学没有显著影响。最后，通过伪一级、伪二级和内扩散模型研究了吸附动力学，其中伪一级模型与实验结果具有最佳相关性。
