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Facile and novel ambient pressure drying approach to synthesis and physical characterization of cellulose-based aerogels
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2020-05-21 , DOI: 10.1007/s10934-020-00901-4
Ali Ebrahimi , Behnaz Dahrazma , Mehdi Adelifard

In this study, highly porous and ultralight cellulose aerogel (CA) was successfully synthesized via a novel and facile ambient pressure drying technique. In this drying method, naphthalene (NPH) as the porous-making agent occupied space between cellulose fibers and controlled structural collapse and severe shrinkage of samples successfully. By sublimation of NPH crystals at the end of procedure, ultimate CA was obtained. This technique can be considered as a fast, safe and cost-effective drying method. CA samples illustrated appropriate physical characteristics including: low densities (0.058 g cm−3), high porosity (> 96.5%), low thermal conductivity (0.0417 W m−1 K−1), appropriate mechanical strength and negligible shrinkage (< 10%) during the drying procedure. hydrophobic cellulose aerogel (HCA) and carbonized cellulose aerogel (CCA) were also obtained and the oil/water separation efficiency of these samples were investigated. Contact angle test reveled highly hydrophobicity with angle equal to 137° and 126° for HCA and CCA, respectively. Investigation of oils and organic solvents adsorption capacity illustrated that samples adsorbed oils and organic solvents in range from 1200 to 1800% of their weight. Regeneration ability of HCA and CCA was studied in five cycles. Depending on type of adsorbate, regeneration study showed various regeneration capacity from 30 to 98%.



中文翻译:

简便新颖的常压干燥方法,用于合成和表征纤维素基气凝胶

在这项研究中,通过一种新颖且便捷的环境压力干燥技术成功合成了高孔隙度和超轻纤维素气凝胶(CA)。在这种干燥方法中,萘(NPH)作为制孔剂成功地占据了纤维素纤维之间的空间,并成功地控制了结构的塌陷和样品的严重收缩。通过在过程结束时将NPH晶体升华,可以获得最终的CA。该技术可以被认为是一种快速,安全和经济的干燥方法。CA样品说明了适当的物理特性,包括:低密度(0.058 g cm -3),高孔隙率(> 96.5%),低导热率(0.0417 W m -1 K -1),干燥过程中适当的机械强度和可忽略的收缩率(<10%)。还获得了疏水性纤维素气凝胶(HCA)和碳化纤维素气凝胶(CCA),并研究了这些样品的油/水分离效率。接触角测试显示出高度疏水性,HCA和CCA的角度分别等于137°和126°。对油和有机溶剂的吸附能力的研究表明,样品吸附的油和有机溶剂的重量为重量的1200%至1800%。在五个周期中研究了HCA和CCA的再生能力。根据被吸附物的类型,再生研究显示出从30%到98%的各种再生能力。

更新日期:2020-05-21
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