Wang Nan, Xia Chuntao, Liu Tingting, Wang Dawei
School of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China.
Key Laboratory of Technological Innovations for Grain Deep-Processing and High-Effeciency Utilization of By-Products of Jilin Province, Changchun 130118, China.
Polymers (Basel). 2025 Jun 27;17(13):1779. doi: 10.3390/polym17131779.
Herein, a novel super-hygroscopic material, steam-exploded modified corn stalk pith (SE-CSP), was developed from corn stalk pith (CSP) via the steam explosion (SE) method, and its hygroscopic properties and mechanisms were evaluated. The results confirmed that SE effectively removed lignin and hemicellulose, disrupted the thin cell walls of natural CSP, and formed an aligned porous structure with capillary channels. SE changed the bonding distribution and surface morphology, and enhanced the crystallinity and thermal stability of CSP. The equilibrium hygroscopic percentage of SE-CSP (62.50%) was higher than that of CSP (44.01%) at 25 °C and 80% relative humidity (RH), indicating significantly greater hygroscopicity. The hygroscopic process of SE-CSP followed a Type III isotherm and fitted the Guggenheim-Anderson-de Boer (GAB), Peleg, and pseudo-first-order kinetic models. This process exhibited multi-layer adsorption with enthalpy-driven, exothermic behavior, primarily through physical adsorption involving hydrogen bonds and van der Waals forces. This work offered a new approach for advancing sorption dehumidification technology.
在此，通过蒸汽爆破（SE）法从玉米秸秆髓（CSP）开发出一种新型超吸湿材料——蒸汽爆破改性玉米秸秆髓（SE-CSP），并对其吸湿性能和机理进行了评估。结果证实，SE有效地去除了木质素和半纤维素，破坏了天然CSP的薄壁细胞，并形成了具有毛细管通道的排列多孔结构。SE改变了键合分布和表面形态，并提高了CSP的结晶度和热稳定性。在25℃和80%相对湿度（RH）条件下，SE-CSP的平衡吸湿率（62.50%）高于CSP（44.01%），表明其吸湿性显著更强。SE-CSP的吸湿过程遵循III型等温线，并符合 Guggenheim-Anderson-de Boer（GAB）、Peleg和准一级动力学模型。该过程表现出多层吸附，具有焓驱动的放热行为，主要通过涉及氢键和范德华力的物理吸附实现。这项工作为推进吸附除湿技术提供了一种新方法。
