Development of several emerging nanocomposites based on the immobilization of various amines over high-surface-area flowery silica nanomaterials achieved via a light-driven hydrolysis approach has been demonstrated for CO₂ capture under standard temperature and pressure conditions. We have studied CO₂ adsorption kinetics and adsorption isotherms for these novel functionalized nanocomposites during the adsorption process. CO₂ adsorption capacity of these adsorbents has been estimated, and the time-dependent CO₂ adsorption has been studied to evaluate the adsorption rate. We have also investigated the CO₂ sorption performances of these nanocomposites by varying the anchored amines as well as their level of loading. The adsorption performance and stability of these adsorbents have been investigated over numerous adsorption–desorption cycles to ascribe their reusability as well as applicability compared to other reported adsorbents. A detailed kinetic study illustrates that the adsorption process follows Avrami’s fractional order kinetic model, corroborating to the multiple reaction pathways involved in the adsorption process.

中文翻译：

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高表面面积花状二氧化硅纳米材料对CO ₂吸附的参数研究和详细动力学理解

已经证明了在光和水解条件下，通过将多种胺固定在高表面积花状二氧化硅纳米材料上，开发出几种新兴的纳米复合材料，用于在标准温度和压力条件下捕获CO ₂。我们已经研究了这些新型功能化纳米复合材料在吸附过程中的CO ₂吸附动力学和吸附等温线。估计了这些吸附剂的CO ₂吸附容量，并研究了随时间变化的CO ₂吸附量以评估吸附速率。我们还研究了CO ₂这些纳米复合材料的吸附性能通过改变锚定胺及其负载水平来实现。这些吸附剂的吸附性能和稳定性已在许多吸附-解吸循环中进行了研究，以使其与其他已报道的吸附剂相比具有可重复使用性和适用性。详细的动力学研究表明，吸附过程遵循Avrami的分数阶动力学模型，证实了吸附过程涉及的多个反应途径。