Tumurbaatar Oyundari, Popova Margarita, Mitova Violeta, Shestakova Pavletta, Koseva Neli
Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bl. 9, 1113 Sofia, Bulgaria.
Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bl. 103A, 1113 Sofia, Bulgaria.
Materials (Basel). 2023 Jun 4;16(11):4179. doi: 10.3390/ma16114179.
Adsorption methods for CO capture are characterized by high selectivity and low energy consumption. Therefore, the engineering of solid supports for efficient CO adsorption attracts research attention. Modification of mesoporous silica materials with tailor-made organic molecules can greatly improve silica's performance in CO capture and separation. In that context, a new derivative of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, possessing an electron-rich condensed aromatic structure and also known for its anti-oxidative properties, was synthesized and applied as a modifying agent of 2D SBA-15, 3D SBA-16, and KIT-6 silicates. The physicochemical properties of the initial and modified materials were studied using nitrogen physisorption and temperature-gravimetric analysis. The adsorption capacity of CO was measured in a dynamic CO adsorption regime. The three modified materials displayed a higher capacity for CO adsorption than the initial ones. Among the studied sorbents, the modified mesoporous SBA-15 silica showed the highest adsorption capacity for CO (3.9 mmol/g). In the presence of 1 vol.% water vapor, the adsorption capacities of the modified materials were enhanced. Total CO desorption from the modified materials was achieved at 80 °C. The obtained silica materials displayed stable performance in five CO adsorption/desorption cycles. The experimental data can be appropriately described by the Yoon-Nelson kinetic model.
用于捕获 CO 的吸附方法具有高选择性和低能耗的特点。因此，用于高效 CO 吸附的固体载体工程引起了研究关注。用定制的有机分子对介孔二氧化硅材料进行改性可以大大提高二氧化硅在 CO 捕获和分离方面的性能。在此背景下，合成了一种 9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物的新衍生物，它具有富电子的稠合芳香结构且以其抗氧化性能而闻名，并将其用作二维 SBA-15、三维 SBA-16 和 KIT-6 硅酸盐的改性剂。使用氮气物理吸附和热重分析研究了初始材料和改性材料的物理化学性质。在动态 CO 吸附过程中测量了 CO 的吸附容量。三种改性材料对 CO 的吸附容量均高于初始材料。在所研究的吸附剂中，改性介孔 SBA-15 二氧化硅对 CO 的吸附容量最高（3.9 mmol/g）。在存在 1 vol.% 水蒸气的情况下，改性材料的吸附容量有所提高。改性材料在 80 °C 时实现了 CO 的完全解吸。所获得的二氧化硅材料在五个 CO 吸附/解吸循环中表现出稳定的性能。实验数据可以用 Yoon-Nelson 动力学模型进行适当描述。
