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Exploring the potential of infrared spectroscopy on the study of the adsorption/desorption of siloxanes for biogas purification

ty10086 提交于 周四, 08/26/2021 - 13:18
Abstract(#br)A commercial activated carbon (AC) was characterized by physicochemical methods. The AC adsorption/desorption properties and the adsorbent regenerability were evaluated for the removal of octamethylcyclotetrasiloxane (D4), a common siloxane impurity in biogases. In situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) was employed to investigate the adsorption of D4 on AC at room temperature and its thermodesorption up to 300\u003cce:hsp sp=\"0.25\"/\u003e°C.

利用三维多孔、经济、环保的聚合物从水溶液中去除Carbol Fuchsin。

ty10086 提交于 周三, 08/25/2021 - 16:14
本研究采用一种非常简单、方法不同的廉价材料制备了三维( 3D )多孔聚二甲基硅氧烷( PDMS )。本研究首次将PDMS用于去除Carbol Fuchsin ( CF )阳离子有机染料污染。此外,3D PDMS对CF的吸附能力与其他已发表的材料相比也相当高。利用FT - IR、Raman、SEM、体视显微镜、EDX、UV / vis、TGA等光谱和成像技术对合成的PDMS进行了表征。确定最佳条件为10 mg。L-1初始浓度,20 mg吸附剂剂量,接触时间2 h,pH 1.0,25 ˚℃温度。分别在约89 %和88.8 mg . g-1时计算CF的去除率和最大吸附量。此外,平衡研究表明,Langmuir等温线模型能很好地拟合CF的去除。此外,根据动力学结果,二级动力学模型适合于CF的吸附( qe,cal 89.3 mg . g-1和qe,exp 88.8 mg . g-1接近)。热力学研究表明,吸附是自发进行的,吸附过程为物理吸附。此外,研究了吸附剂的重复使用性能。