Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing Technology and Business University, Beijing 100048, China; College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
Technology Research Center, Wuliangye Yibin Co., Ltd., Yibin 644007, China.
Int J Biol Macromol. 2022 Sep 1;216:157-171. doi: 10.1016/j.ijbiomac.2022.06.178. Epub 2022 Jul 1.
Huangshui (HS), a typical by-product of traditional Chinese Baijiu, has attracted more and more attention since its rich resources of polysaccharides. However, there's little information on hydrogels preparation by Huangshui polysaccharides (HSPs). A series of novel HSP-loaded hydrogels were synthesized using crude HSP (cHSP), polyvinyl alcohol (PVA), sodium carboxyl methyl cellulose (CMC), and in situ incorporation of FeO for methylene blue (MB) adsorption for the first time. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and texture tests indicated the paramagnetic hydrogels with porous structure were formed via physical crosslinking, and cHSP had no effect on hydrogel texture. Notably, cHSP enhanced the swelling capacity and MB adsorption ability of the hydrogels, and the corresponding maximum value was 38.67 g/g and 71.07 mg/g, respectively, when the additive amount of cHSP to the hydrogels was 2 % at 25°С. In addition, the swelling kinetics of hydrogels followed the Schott's second-order kinetics model, while MB adsorption fitted well with the Freundlich isotherm and pseudo-second-order model. Furthermore, intraparticle and film diffusion-controlled MB adsorption process. Significantly, cHSP amount could counteract the negative influence of high temperature on MB adsorption, and the prepared hydrogels could be reusable, demonstrating cHSP effectively promoted the properties of hydrogels and had potential application in MB removal. The adsorption mechanism of MB onto the hydrogels involved ion-exchange, hydrogen bonding, electrostatic interaction, and chemical reaction according to the above results together with the analysis by X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray (EDX) characterizations, thermodynamic, etc.
黄水（HS）是中国传统白酒的一种典型副产物，由于其丰富的多糖资源，近年来受到了越来越多的关注。然而，关于用黄水多糖（HSPs）制备水凝胶的信息却很少。本文首次利用粗 HSP（cHSP）、聚乙烯醇（PVA）、羧甲基纤维素钠（CMC）和原位掺入 FeO 合成了一系列新型 HSP 负载水凝胶，用于亚甲基蓝（MB）吸附。傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、振动样品磁强计（VSM）和质构测试表明，具有多孔结构的顺磁性水凝胶是通过物理交联形成的，cHSP 对水凝胶的结构没有影响。值得注意的是，cHSP 提高了水凝胶的溶胀能力和 MB 吸附能力，当 25°C 时水凝胶中 cHSP 的添加量为 2%时，对应的最大值分别为 38.67 g/g 和 71.07 mg/g。此外，水凝胶的溶胀动力学符合 Schott 二级动力学模型，而 MB 吸附则很好地符合 Freundlich 等温线和准二级动力学模型。此外，内扩散和膜扩散控制 MB 吸附过程。显著的是，cHSP 的量可以抵消高温对 MB 吸附的负面影响，并且制备的水凝胶可以重复使用，这表明 cHSP 有效地促进了水凝胶的性能，在 MB 去除方面具有潜在的应用。根据上述结果以及 X 射线光电子能谱（XPS）和能谱（EDX）分析、热力学等分析，MB 吸附到水凝胶上的吸附机制涉及离子交换、氢键、静电相互作用和化学反应。
