SBA-15 mesoporous molecular sieves were used as the adsorption medium to capture carbon dioxide by the gas hydrate method. First, it is confirmed that the synthesized SBA-15 material has a uniform pore size with the 77 K nitrogen adsorption–desorption isotherms and transmission electron microscopy analyses. Second, the effects of the capture of carbon dioxide on the SBA-15 material by adding different amounts of water were investigated. Each adsorption isotherm of the SBA-15 material with different presorbed water has a jump point, and the adsorption capacity of CO₂ increased with the increase of the water–sample ratio (R_w, the mass ratio of the preadsorbed water and the dry SBA-15 material). At 2.5 MPa, the adsorption capacity of R_w = 2.0 is 20.14 mmol/g and that of the dry material is 3.86 mmol/g. The optimal water–sample ratio was determined to be 2.0. The formation of carbon dioxide hydrate of the jump point on the wet SBA-15 is verified by the enthalpy of capturing carbon dioxide. Finally, the effects on carbon dioxide hydrate formation at the wet SBA-15 material with different surfactants [SDS, sodium dodecyl benzene sulfonate (SDBS), and polysorbate 80 (Tween 80)] were investigated. The results show that the promoting effects of different types of promoters increase first and then decrease with increasing concentration. The optimal concentrations of SDS, SDBS, and Tween 80 are 1000, 1500, and 1000 mg/L, respectively. The wet SBA-15 with 1500 mg/L SDBS has the best promotion effect among the three surface surfactants.

中文翻译：

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在具有不同表面活性剂的湿式SBA-15介孔分子筛上捕获二氧化碳

用SBA-15介孔分子筛作为吸附介质通过气体水合物法捕获二氧化碳。首先，通过77 K氮吸附-解吸等温线和透射电子显微镜分析，可以确定合成的SBA-15材料具有均匀的孔径。其次，研究了通过添加不同量的水来捕获二氧化碳对SBA-15材料的影响。具有不同预吸附水的SBA-15材料的每个吸附等温线都有一个跳跃点，并且CO ₂的吸附容量随水样比（R _w，预吸附水与干燥SBA的质量比）的增加而增加。-15材质）。在2.5 MPa时，R _w的吸附容量= 2.0为20.14 mmol / g，而干燥物质的值为3.86 mmol / g。最佳水样比确定为2.0。湿式SBA-15上跃点的二氧化碳水合物的形成通过捕获二氧化碳的焓来验证。最后，研究了使用不同的表面活性剂[SDS，十二烷基苯磺酸钠（SDBS）和聚山梨酯80（吐温80）]对湿SBA-15材料中二氧化碳水合物形成的影响。结果表明，随着浓度的增加，不同类型启动子的促进作用先升高后降低。SDS，SDBS和Tween 80的最佳浓度分别为1000、1500和1000 mg / L。在三种表面活性剂中，具有1500 mg / L SDBS的湿式SBA-15具有最佳的促进作用。