Son Yeongkyun, Kim Tae-Hyun, Kim Daekeun, Hwang Yuhoon
Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea.
Nanomaterials (Basel). 2021 Feb 3;11(2):388. doi: 10.3390/nano11020388.
A volatile organic compound adsorbent based on a porous clay heterostructure (PCH) with alginate biopolymer was successfully prepared. From N adsorption-desorption analysis, the specific surface area, pore volume, and pore size of bentonite were dramatically increased after introducing the porous structure. Following complexation with alginate (Alg-PCH), the pore volume and pore size were not significantly affected by pore structure. The thermal stability of Alg-PCH shows enhanced thermal stability compared to alginate and alginate beads. The morphology layered structure of Alg-PCH was carried out by transmission electron microscopy (TEM), suggesting the disorder and re-order of the -axis layer stacking by porous structure and complexation with alginate, respectively, which was well-matched with X-ray diffraction results. To optimize the preparation of Alg-PCH, various reaction conditions (alginate, CaCl concentration, bead size, and weight ratio between alginate and PCH) were utilized. According to the toluene adsorption-desorption experiments, the preparation conditions for Alg-PCH were selected as a 2 mm extrusion tip, 0.5% of alginate, and 2% of CaCl solution with a 1:50 alginate:PCH weight ratio. Additionally, it shows 61.63 mg/g adsorption capacity with around 49% desorption efficacy under atmospheric temperature and pressure.
成功制备了一种基于多孔粘土异质结构（PCH）与海藻酸盐生物聚合物的挥发性有机化合物吸附剂。通过N吸附-脱附分析可知，引入多孔结构后膨润土的比表面积、孔体积和孔径显著增加。与海藻酸盐络合（Alg-PCH）后，孔体积和孔径受孔结构的影响不显著。与海藻酸盐和海藻酸盐珠相比，Alg-PCH的热稳定性有所增强。通过透射电子显微镜（TEM）对Alg-PCH的形态层状结构进行了研究，结果表明，多孔结构和与海藻酸盐络合分别导致了其在c轴层堆积上的无序和重排，这与X射线衍射结果吻合良好。为了优化Alg-PCH的制备，采用了各种反应条件（海藻酸盐、CaCl浓度、珠粒尺寸以及海藻酸盐与PCH之间的重量比）。根据甲苯吸附-脱附实验，将Alg-PCH的制备条件选择为2mm的挤出尖端、0.5%的海藻酸盐、2%的CaCl溶液以及1:50的海藻酸盐与PCH重量比。此外，在常温常压下，它表现出61.63mg/g的吸附容量和约49%的脱附效率。
