Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt.
Organic Nanomaterials Lab, Department of Chemistry, Hannam University, Daejeon 34054, Republic of Korea; Fire Protection Laboratory, National Institute of Standards, 136, Giza 12211, Egypt.
Int J Biol Macromol. 2021 Jan 15;167:1113-1125. doi: 10.1016/j.ijbiomac.2020.11.065. Epub 2020 Nov 14.
Herein, we reported the preparation of novel antibacterial nanocomposites based on biodegradable polymers. The nanocomposites were applied as capable adsorbent for removing of malachite green (MG) dye, as well as inhibiting of E. coli and S. aureus growth as the most common pollutants for water. The grafted xanthan gum with poly(vinylimidazole) (XG-g-PVI) nanocomposites were synthesized in the presence of different Montmorillonite (MMT) nanoclays concentrations (1%, 3% and 5%). The prepared modified XG nanocomposites were detected through XRD, SEM-EDX, FTIR and TEM. The maximum adsorption MG capacity was determined as 99.99% (909.1 mg/g) in basic medium at 30 °C for 90 min. The adsorption isotherm for removal of MG dye was studied against different models like Langmuir, Freundlich, Temkin, FloryHuggins isotherm models, however, the adsorption results were good fitted with Langmuir isotherm model (R = 0.9942). Additionally, various adsorption kinetic models: pseudo-first order, second order, pseudo-second order, and intra-particle diffusion models were studied for adsorption mechanism of MG dye on top of prepared nanocomposite surface. Finally, the antibacterial activity outcomes displayed that the prepared XG-g-PVI/MMT nanocomposites had excellent inhibition growth for bacteria and the antibacterial activity increased abruptly with the increased of MMT nanoclay concentrations.
本文报道了基于可生物降解聚合物的新型抗菌纳米复合材料的制备。该纳米复合材料可用作去除孔雀石绿 (MG) 染料以及抑制大肠杆菌和金黄色葡萄球菌生长的有效吸附剂，因为它们是水的最常见污染物。在不同蒙脱土 (MMT) 纳米粘土浓度 (1%、3%和 5%) 的存在下，合成了接枝黄原胶与聚 (乙烯基咪唑) (XG-g-PVI) 纳米复合材料。通过 XRD、SEM-EDX、FTIR 和 TEM 对制备的改性 XG 纳米复合材料进行了检测。在碱性介质中，在 30°C 下吸附 90 分钟，MG 最大吸附容量为 99.99%（909.1 mg/g）。研究了去除 MG 染料的吸附等温线对不同模型的影响，如 Langmuir、Freundlich、Temkin、FloryHuggins 等温线模型，但吸附结果与 Langmuir 等温线模型拟合良好（R = 0.9942）。此外，还研究了各种吸附动力学模型：伪一级、二级、准二级和内扩散模型，以研究 MG 染料在制备的纳米复合材料表面上的吸附机制。最后，抗菌活性结果表明，制备的 XG-g-PVI/MMT 纳米复合材料对细菌的生长具有优异的抑制作用，并且随着 MMT 纳米粘土浓度的增加，抗菌活性急剧增加。
