In this work, silica-based CO₂ adsorbents were successfully prepared by the sol–gel method. These materials were chemically modified with 3-aminopropyltriethoxysilane (APTES) using the grafting technique. Two synthesis parameters were investigated in this study, namely the solvent used in the grafting step (toluene against ethanol) and the process employed for removing the solvent (filtration against evaporation). The influence of these parameters on pore structure, surface chemistry and CO₂ capture performance were evaluated and discussed on the basis of a series of experimental tests, including FTIR, TG-MS, nitrogen adsorption tests, XRD, TEM and CO₂ adsorption. The use of ethanol led to samples with a NH₂ concentration of about 1.20 ± 0.05 mmol g⁻¹. On the other hand, samples obtained using toluene showed amine concentrations two times higher than the specimens prepared with ethanol. Samples obtained by evaporation exhibited blocked pores and a low CO₂ adsorption capacity when compared to those obtained by filtration. The sample prepared using toluene as the solvent and a filtration step displayed a CO₂ adsorption capacity as high as 6.3 wt% at 30 °C and 1 bar.

在这项工作中，通过溶胶-凝胶法成功制备了基于二氧化硅的CO ₂吸附剂。使用接枝技术，使用3-氨丙基三乙氧基硅烷（APTES）对这些材料进行了化学修饰。在这项研究中，研究了两个合成参数，即接枝步骤中使用的溶剂（甲苯对乙醇）和去除溶剂的方法（针对蒸发的过滤）。在一系列实验测试的基础上，评估和讨论了这些参数对孔结构，表面化学和CO ₂捕获性能的影响，包括FTIR，TG-MS，氮吸附测试，XRD，TEM和CO ₂吸附。乙醇的使用导致样品中的NH ₂浓度约为1.20±0.05 mmol g ^-1。另一方面，使用甲苯获得的样品显示出的胺浓度比使用乙醇制备的样品高出两倍。与通过过滤获得的样品相比，通过蒸发获得的样品表现出堵塞的孔和低的CO ₂吸附能力。使用甲苯作为溶剂和过滤步骤制备的样品在30°C和1 bar下显示出高达6.3 wt％的CO ₂吸附能力。