Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Chemosphere. 2023 Apr;321:138114. doi: 10.1016/j.chemosphere.2023.138114. Epub 2023 Feb 9.
Montmorillonite (Mt) is a potential adsorbent for volatile organic vapor removal from contaminated soils because of its rich reserves and porous nature, but its inertia surface property has limited its application for polar compounds. In this study, modifications of Mt were carried out by high energy ball milling with HO and tetramethylammonium bromide (TMAB) to obtain adsorbents with both high porosity and abundant Si-OH groups (BHTMt). The microporous structure produced by TMAB insertion as well as the silanol (Si-OH) groups formed by HO oxidation improved the adsorption of acetone by the modified material. The adsorption capacity of BHTMt for acetone was increased by 80% compared to the original Mt. The effect of HO dosage on the adsorption performance for gaseous acetone was investigated by dynamic adsorption experiments. The adsorption kinetic results demonstrated that the adsorption of acetone by the modified material was subject to both physical and chemical adsorption. Density functional theory calculations indicated that there was no obvious interaction between TMAB and acetone, and the materials adsorbed acetone mainly through hydrogen bonding interaction of Si-OH as well as pore filling effects.
蒙脱石（Mt）因其储量丰富和多孔的性质，是一种有潜力的从污染土壤中去除挥发性有机蒸气的吸附剂，但由于其惰性表面性质，限制了其在极性化合物方面的应用。在本研究中，通过高能球磨用 HO 和四甲基溴化铵（TMAB）对 Mt 进行了改性，以获得具有高孔隙率和丰富 Si-OH 基团的吸附剂（BHTMt）。TMAB 插入产生的微孔结构以及 HO 氧化形成的硅醇（Si-OH）基团提高了改性材料对丙酮的吸附。与原始 Mt 相比，BHTMt 对丙酮的吸附容量增加了 80%。通过动态吸附实验研究了 HO 用量对气态丙酮吸附性能的影响。吸附动力学结果表明，改性材料对丙酮的吸附同时受到物理吸附和化学吸附的影响。密度泛函理论计算表明，TMAB 与丙酮之间没有明显的相互作用，材料主要通过 Si-OH 的氢键相互作用以及孔填充效应吸附丙酮。
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