School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
Int J Biol Macromol. 2020 Nov 15;163:1915-1925. doi: 10.1016/j.ijbiomac.2020.09.047. Epub 2020 Sep 12.
A new type of double-network hydrogel, cross-linked with microcrystalline cellulose grafted with ε-polylysine (MCC-PL) and N,N-methylene bisacrylamide/acrylic acid, was synthesised to efficiently inhibit bacterial proliferation and remove heavy metals. The physicochemical properties of the MCC-PL hydrogel (MCC-PLH) were characterised using scanning electronic microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and differential thermogravimetric analysis. The adsorption results showed that the optimal adsorption conditions were temperature of 313 K at pH of 5 and 6 of Pb and Cu, respectively. The adsorption mechanism of MCC-PLH5 was successfully determined using Freundlich isotherm, pseudo-second kinetics, and intra-particle diffusion model, in conjunction with X-ray photoelectron spectroscopy. Adsorption thermodynamic studies indicated that the process was spontaneous and endothermic. Antibacterial experiments showed that PL-grafted MCC hydrogel exhibited more efficient and durable antibacterial activity than MCC, indicating its potential for water decontamination.
一种新型的双网络水凝胶，由接枝了 ε-聚赖氨酸的微晶纤维素（MCC-PL）和 N,N-亚甲基双丙烯酰胺/丙烯酸交联而成，被合成出来以有效抑制细菌增殖和去除重金属。MCC-PL 水凝胶（MCC-PLH）的物理化学性质使用扫描电子显微镜、傅里叶变换红外光谱、X 射线衍射、热重分析和差示热重分析进行了表征。吸附结果表明，Pb 和 Cu 的最佳吸附条件分别为温度 313 K、pH 值 5 和 6。MCC-PLH5 的吸附机制成功地通过 Freundlich 等温线、拟二级动力学和内扩散模型以及 X 射线光电子能谱确定。吸附热力学研究表明，该过程是自发的和吸热的。抗菌实验表明，PL 接枝 MCC 水凝胶比 MCC 具有更高效和持久的抗菌活性，表明其在水净化方面具有潜力。
