School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China; Department of Civil and Environmental Engineering, University of Alberta, Edmonton AB T6G 2W2, Canada.
School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China.
J Hazard Mater. 2021 Apr 15;408:124911. doi: 10.1016/j.jhazmat.2020.124911. Epub 2020 Dec 25.
Mesoporous silica MCM-41 was synthesized by a facile hydrothermal treatment using sodium silicate extracted from natural Opoka as the Si source. The dynamic adsorption and desorption of organic vapors mixture on the MCM-41 were investigated. Characterization of the textural properties of the samples showed that the sample synthesized with a molar ratio of CTAB/Si = 0.16 possessed the largest specific surface area (988 m/g) and pore volume (1.02 cm/g), also uniform pore size distribution centered at 2.8 nm. The adsorption capacity of this sample for organic vapors mixture improved remarkably over raw Opoka and reached 158.5 mg/g at 20 ℃, which is comparable to that of commercial activated carbon. The reusability of the adsorbent was tested by 5 adsorption and regeneration cycles. Obtained results demonstrate that the MCM-41 adsorbent can be easily regenerated by thermal desorption in air, and the cumulative heel on the adsorbent can be markedly reduced by increasing the desorption temperature, making it a promising adsorbent for VOCs abatement.
介孔硅材料 MCM-41 是通过水热法合成的，所用硅源为天然欧泊石中提取的硅酸钠。研究了 MCM-41 对有机蒸气混合物的动态吸附和解吸性能。样品的结构性质表征表明，当 CTAB/Si 的摩尔比为 0.16 时，样品具有最大的比表面积（988 m/g）和孔体积（1.02 cm/g），孔径分布也较均匀，中心值为 2.8nm。与原始欧泊石相比，该样品对有机蒸气混合物的吸附容量显著提高，在 20℃时达到 158.5mg/g，与商业活性炭相当。通过 5 次吸附和再生循环测试了吸附剂的可重复使用性。结果表明，MCM-41 吸附剂可以通过在空气中的热解吸来轻松再生，通过提高解吸温度可以显著减少吸附剂的累积损失，使其成为一种有前途的 VOCs 减排吸附剂。
