Preparation and selective adsorption of core–shell desiccant for heat and moisture recovery
Preparation and selective adsorption of core–shell desiccant for heat and moisture recovery
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DOI：
10.1016/j.colsurfa.2012.04.052
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发表时间：
2012-07
期刊：
影响因子：
--
通讯作者：
Li-xia Pei;Li-Zhi Zhang
中科院分区：
文献类型：
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作者：
Li-xia Pei;Li-Zhi Zhang
为改善室内空气质量，研制了一种具有高选择性、高吸水性、低甲苯吸附性的核壳结构干燥剂。通过对介孔二氧化硅（MS）外表面进行选择性胺功能化，分别以苹果酸钠（MAS）、聚丙烯酸钠（PAAS）和聚苯乙烯磺酸钠（PSS）为改性剂进行组装，成功制备了3种不同壳层的干洗剂（MS- nh2 -MAS、MS- nh2 -PAAS和MS- nh2 -PSS）。n2吸附等温线表明，新型核壳干燥剂具有与ms相似的孔隙结构，并通过突破试验对其吸附性能进行了评价。与质谱相比，这些新型干燥剂由于对水分的亲和力增强，具有更高的选择性和更大的水分吸附能力。MS- nh2 - mas、MS- nh2 - paas和MS- nh2 - pss的水/甲苯选择性分别是MS的4.7倍、3.2倍和2.8倍。
To improve indoor air quality, a type of highly selective desiccant with core–shell structure, which can adsorb more moisture and less toluene, was developed for heat and moisture recovery. Three desiccants (MS-NH2-MAS, MS-NH2-PAAS, and MS-NH2-PSS) with different shells were successfully prepared by selective amine-functionalization of mesoporous silica (MS) external surface, and subsequent assembly with sodium malate (MAS), sodium polyacrylate (PAAS), and sodium polystyrene sulfonate (PSS) as modifying agent, respectively. N2-adsorption isotherms showed that the novel core–shell desiccants had the similar pore structure to MS. The adsorption performances were evaluated by the breakthrough test. Compared to MS, these novel desiccants exhibit much higher selectivity and larger adsorption capacity of moisture because of their enhanced affinity for moisture. The moisture/toluene selectivities of MS-NH2-MAS, MS-NH2-PAAS, and MS-NH2-PSS are 4.7, 3.2, and 2.8 times than that of MS, respectively.