Parmanbek Nursanat, Sütekin Duygu S, Barsbay Murat, Mashentseva Anastassiya A, Zheltov Dmitriy A, Aimanova Nurgulim A, Jakupova Zhanar Ye, Zdorovets Maxim V
The Institute of Nuclear Physics of the Republic of Kazakhstan, Almaty 050032, Kazakhstan.
Department of Chemistry, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan.
Polymers (Basel). 2022 Sep 26;14(19):4026. doi: 10.3390/polym14194026.
Nanoporous track-etched membranes (TeM) are promising materials as adsorbents to remove toxic pollutants, but control over the pore diameter and density in addition to precise functionalization of nanochannels is crucial for controlling the surface area and efficiency of TeMs. This study reported the synthesis of functionalized PET TeMs as high-capacity sorbents for the removal of trivalent arsenic, As(III), which is more mobile and about 60 times more toxic than As(V). Nanochannels of PET-TeMs were functionalized by UV-initiated reversible addition fragmentation chain transfer (RAFT)-mediated grafting of 2-(dimethyamino)ethyl methacrylate (DMAEMA), allowing precise control of the degree of grafting and graft lengths within the nanochannels. Ag NPs were then loaded onto PDMAEMA--PET to provide a hybrid sorbent for As(III) removal. The As(III) removal efficiency of Ag@PDMAEMA--PET, PDMAEMA--PET, and pristine PET TeM was compared by adsorption kinetics studies at various pH and sorption times. The adsorption of As(III) by Ag@DMAEMA--PET and DMAEMA--PET TeMs was found to follow the Freundlich mechanism and a pseudo-second-order kinetic model. After 10 h, As(III) removal efficiencies were 85.6% and 56% for Ag@PDMAEMA--PET and PDMAEMA--PET, respectively, while PET template had a very low arsenic sorption capacity of 17.5% at optimal pH of 4.0, indicating that both PDMAEMA grafting and Ag-NPs loading significantly increased the As(III) removal capacity of PET-TeMs.
纳米多孔径迹蚀刻膜（TeM）作为去除有毒污染物的吸附剂是很有前景的材料，但除了对纳米通道进行精确功能化外，控制孔径和密度对于控制TeM的表面积和效率至关重要。本研究报道了功能化聚对苯二甲酸乙二酯TeM的合成，其作为高容量吸附剂用于去除三价砷（As(III)），As(III)的迁移性更强，毒性比五价砷（As(V)）大60倍左右。通过紫外光引发的可逆加成断裂链转移（RAFT）介导的甲基丙烯酸2-(二甲氨基)乙酯（DMAEMA）接枝对PET-TeM的纳米通道进行功能化，从而能够精确控制纳米通道内的接枝度和接枝长度。然后将银纳米颗粒（Ag NPs）负载到聚甲基丙烯酸二甲氨基乙酯-聚对苯二甲酸乙二酯（PDMAEMA--PET）上，以提供一种用于去除As(III)的混合吸附剂。通过在不同pH值和吸附时间下的吸附动力学研究，比较了Ag@PDMAEMA--PET、PDMAEMA--PET和原始PET TeM对As(III)的去除效率。发现Ag@DMAEMA--PET和DMAEMA--PET TeM对As(III)的吸附遵循弗伦德利希机理和准二级动力学模型。10小时后，Ag@PDMAEMA--PET和PDMAEMA--PET对As(III)的去除效率分别为85.6%和56%，而在最佳pH值4.0时，PET模板的砷吸附容量非常低，为17.5%，这表明PDMAEMA接枝和Ag-NPs负载均显著提高了PET-TeM对As(III)的去除能力。
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