基于羧甲基黄水多糖修饰的海藻酸钠/FeO 的可重复使用水凝胶球的制备及其对亚甲基蓝的高效吸附性能。
Preparation of reusable hydrogel spheres based on sodium alginate/FeO modified with carboxymethyl Huangshui polysaccharide and the efficient adsorption performance for methylene blue.
机构信息
China Food Flavor and Nutrition Health Innovation Center, Beijing Technology and Business University, Beijing 100048, China; 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.
China Food Flavor and Nutrition Health Innovation Center, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing Technology and Business University, Beijing 100048, China; Beijing Laboratory of Food Quality and Safety, Beijing Technology and Business University, Beijing 100048, China; College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
出版信息
Food Chem. 2024 Apr 16;438:138064. doi: 10.1016/j.foodchem.2023.138064. Epub 2023 Nov 23.
This study successfully constructed a novel multifunctional bio-adsorbent using sodium alginate (SA), ferroferric oxide (FFO), and carboxymethyl Huangshui polysaccharide (CMHSP) with rapid separation, pH sensitivity, efficient adsorption, and reusability for enhancing the removal of methylene blue (MB) in wastewater. FTIR, XRD, SEM, and VSM results indicated CMHSP improved the porosity of the hydrogel spheres, thus significantly enhancing the MB adsorption capacity with the rate-limiting controlled by chemical adsorption, intraparticle diffusion, and film diffusion. The maximum adsorption capacity obtained from Langmuir model of SA-FFO-CMHSP (186.57 mg/g) was obviously higher than that of SA-FFO (178.82 mg/g). Thermodynamic results showed that the MB adsorption process was endothermic, spontaneous, and favorable, and physical adsorption was dominant. Remarkably, MB adsorption maintained 87% ∼ 95% of the initial after four adsorption-desorption cycles, and proper carboxymethylation was conducive to MB adsorption over a broader range pH. These findings provided reference for designing new efficient bio-adsorbents and the recyclable utilization of Huangshui by-products, which was of great value.
本研究成功构建了一种新型多功能生物吸附剂，采用海藻酸钠（SA）、四氧化三铁（FFO）和羧甲基黄水多糖（CMHSP），具有快速分离、pH 敏感性、高效吸附和可重复使用的特点，可增强废水中亚甲基蓝（MB）的去除效果。FTIR、XRD、SEM 和 VSM 结果表明，CMHSP 提高了水凝胶球的孔隙率，从而显著提高了 MB 的吸附容量，其限速过程受化学吸附、颗粒内扩散和膜扩散控制。从 SA-FFO-CMHSP 的 Langmuir 模型获得的最大吸附容量（186.57 mg/g）明显高于 SA-FFO（178.82 mg/g）。热力学结果表明，MB 吸附过程是吸热、自发和有利的，以物理吸附为主。值得注意的是，MB 吸附在四个吸附-解吸循环后仍保持初始吸附量的 87%∼95%，适当的羧甲基化有利于在更宽的 pH 范围内进行 MB 吸附。这些发现为设计新型高效生物吸附剂和黄水副产物的可重复利用提供了参考，具有重要价值。
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