Direct regeneration of hydrogels based on lemon peel and its isolated microcrystalline cellulose: Characterization and application for methylene blue adsorption
Direct regeneration of hydrogels based on lemon peel and its isolated microcrystalline cellulose: Characterization and application for methylene blue adsorption
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基于柠檬皮及其分离微晶纤维素的水凝胶的直接再生：亚甲基蓝吸附的表征和应用
DOI：
10.1016/j.ijbiomac.2021.09.063
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发表时间：
2021-09-20
影响因子：
8.2
通讯作者：
Cui, Bo
中科院分区：
文献类型：
--
作者：
Dai, Hongjie;Chen, Yuan;Cui, Bo
在本研究中，我们以柠檬皮（LP）及其分离的微晶纤维素（LPMCC）为原料，通过直接共溶在1-丁基-3-甲基咪唑氯（BmimCl）中，然后在蒸馏水中直接再生形成水凝胶，开发了一种简单环保的水凝胶制备方法。系统研究了LP添加量对水凝胶结构和亚甲基蓝吸附性能的影响。水凝胶通过氢键相互作用表现出物理交联的网络。与纯LPMCC水凝胶相比，LP的引入增加了水凝胶的孔隙度，改善了水凝胶的热稳定性。吸附过程更符合准二级动力学模型（R-2 > 0.993）和Langmuir等温模型（R-2 > 0.996）。吸附过程是可行的、自发的、放热的，吸附过程受初始MB浓度、pH、温度、离子类型和强度的影响。值得注意的是，LP的引入提高了水凝胶对MB的吸附能力。这项工作开发了一种简单的基于农业副产品的水凝胶方法，使用纯纤维素作为结构骨架，未经处理的木质纤维素成分作为结构改性剂。
In this study, we developed a facile and eco-friendly fabrication of hydrogels based on lemon peel (LP) and its isolated microcrystalline cellulose (LPMCC) by direct co-dissolving in 1-butyl-3-methylimidazolium chloride (BmimCl), followed by direct regeneration in distilled water to form hydrogels. The influence of LP addition on the structure and methylene blue (MB) adsorption of the hydrogels was systematically investigated. The hydrogels displayed a physically cross-linked network through hydrogen bonding interactions. Compared with pure LPMCC hydrogel, the introduction of LP increased the porosity and improved the thermal stability of the hydrogels. The adsorption process of MB on the hydrogels conformed better to the pseudo-second-order kinetic (R-2 > 0.993) and Langmuir isotherm models (R-2 > 0.996). The MB adsorption process was feasible, spontaneous and exothermic in nature, and was influenced by initial MB concentration, pH, temperature, ionic type and strength. Notably, the introduction of LP improved MB adsorption capacity of the hydrogels. This work develops a facile approach of agricultural by-products based hydrogels using pure cellulose as the structural skeleton and untreated lignocellulose components as the structure modifier.