The Engineering Technological Center of Mushroom Industry, School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, PR China.
Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou, 363000, PR China.
Int J Biol Macromol. 2023 Dec 1;252:126488. doi: 10.1016/j.ijbiomac.2023.126488. Epub 2023 Aug 27.
The objective of this research was to devise a functional hydrogel was synthesized using pectin (PE), acrylic acid (AA), dimethyldiallyl ammonium chloride (DC), and polyvinyl alcohol (PVA), designed to adsorb both cationic and anionic dyes concurrently. The low methoxy pectin formed double network hydrogel through chemical and physical crosslinking with AA and PVA respectively. DC is combined into the hydrogel system through copolymerization reaction. Analysis of hydrogel's physicochemical properties was conducted using techniques such as infrared spectroscopy, texture analysis, thermogravimetry, and scanning electron microscopy. Dyes adsorption studies showed that the LP/AA/DC/PVA-2 hydrogel, prepared at the molar ratio of AA to DC of 1:2, exhibited higher adsorption efficiency for methylene blue (MB) and Congo red (CR). Kinetics and isotherms studies indicated that the adsorption behavior conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. By the Langmuir isotherm fitting, the maximum adsorption capacities of MB and CR by LP/AA/DC/PVA-2 were recorded to be 222.65 mg/g and 316.46 mg/g, respectively. The adsorption mechanism is dominated by the hydrogen bonding and electrostatic interactions. Further, the adsorption and desorption experiments demonstrated that LP/AA/DC/PVA-2 hydrogel have excellent reusability.
本研究旨在设计一种功能性水凝胶，该水凝胶使用果胶（PE）、丙烯酸（AA）、二甲基二烯丙基氯化铵（DC）和聚乙烯醇（PVA）合成，旨在同时吸附阳离子和阴离子染料。低甲氧基果胶分别通过与 AA 和 PVA 的化学和物理交联形成双网络水凝胶。DC 通过共聚反应结合到水凝胶体系中。使用红外光谱、质构分析、热重分析和扫描电子显微镜等技术对水凝胶的物理化学性质进行了分析。染料吸附研究表明，在 AA 与 DC 的摩尔比为 1:2 时，制备的 LP/AA/DC/PVA-2 水凝胶对亚甲基蓝（MB）和刚果红（CR）具有更高的吸附效率。动力学和等温线研究表明，吸附行为符合准二级动力学模型和朗缪尔等温线模型。通过朗缪尔等温线拟合，LP/AA/DC/PVA-2 对 MB 和 CR 的最大吸附容量分别为 222.65mg/g 和 316.46mg/g。吸附机制主要是氢键和静电相互作用。此外，吸附和解吸实验表明，LP/AA/DC/PVA-2 水凝胶具有优异的可重复使用性。
