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Surface Energy Characterization of Different Particulate Silica Gels at Infinite Dilution
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 5.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.colsurfa.2020.125209
M.L. Palash , Animesh Pal , Tahmid Hasan Rupam , Byung-Duck Park , Bidyut Baran Saha

Abstract Porous silica gels are the well-established adsorbent materials used in adsorption cooling, dehumidification, gas separation, and desalination applications. To understand the adsorption characteristics, morphological characterization of the adsorbent is widely used. However, the surface activities of the adsorbent material, which are the most influential parameters for the adsorption process, are still unknown. To determine the surface activities, surface energy analysis has been performed for four silica gel particulates (RD granular silica gel, Chromatorex, Home silica gel, and B-type silica gel) using inverse gas chromatography technique. Experiments have been conducted at infinite dilution (0.008 to 0.1 coverage) with a fixed flowrate (30 sccm) of helium gas. The results showed that RD granular silica gel has the highest value of total surface energy for all the coverages. A correlation between the dispersive component of surface energy and morphological characteristics (variation with specific surface area and pore size distribution) has been discussed. Comparative studies on surface energy components of the studied silica gels and activated carbons have also been presented, which will contribute to fulfilling the knowledge gap between morphological characterization and adsorption phenomenon.

中文翻译:

无限稀释下不同颗粒硅胶的表面能表征

摘要 多孔硅胶是一种成熟的吸附材料,用于吸附冷却、除湿、气体分离和海水淡化应用。为了了解吸附特性,广泛使用吸附剂的形态表征。然而,吸附材料的表面活性是吸附过程中最有影响的参数,仍然未知。为了确定表面活性,使用逆气相色谱技术对四种硅胶颗粒(RD 颗粒硅胶、Chromatorex、家用硅胶和 B 型硅胶)进行了表面能分析。实验是在无限稀释(0.008 至 0.1 倍覆盖率)下进行的,氦气具有固定流速 (30 sccm)。结果表明,RD颗粒硅胶在所有覆盖范围内的总表面能值最高。已经讨论了表面能的分散成分与形态特征(随比表面积和孔径分布的变化)之间的相关性。还提出了对所研究的硅胶和活性炭的表面能组分的比较研究,这将有助于填补形态表征和吸附现象之间的知识差距。
更新日期:2020-10-01
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