Abstract Chitosan/Zinc Oxide Nanocomposite (CS/ZnO Nanocomposite) could be prepared by different physical and chemical methods for various applications. The microwave heating technique was used to chemically prepare CS/ZnO nanocomposite due to the shorter time needed for reactions relative to conventional heating. Series of CS/ZnO nanocomposites were prepared on a function of time (4, 7, 10, 12, 15 min) and microwave power (90,360,600, 800 W) to determine the optimum conditions of the preparation technique. Results revealed that 800 W power and 10 min time were the optimum condition for the preparation process. FT-IR, XRD, TEM, DLS and UV–Vis were used as spectral characterization for the prepared nanocomposites. The results have confirmed that nanocomposite was prepared via the complexation reaction between surface zinc cations of zinc oxide nanoparticles and chitosan (CS) functional groups. TGA analysis showed the enhancement in the thermal properties of nanocomposite compared to neat CS. Further, the efficiency of the prepared nanocomposite for methylene blue dye removal was investigated and compared with neat CS. Dye concentration, materials concentration, pH and contact time were investigated to evaluate the optimum condition for dye removal. It was found that the optimum conditions for MB dye removal by CS/ZnO nanocomposite and CS were 20 mg/L as dye concentration and 60 mg/L of material concentration at pH 9 for 60 min. At these conditions, the modification of CS by ZnO nanoparticles enhanced the MB dye removal from 81% to 96.7%.

中文翻译：

---

壳聚糖/氧化锌纳米复合材料的微波辅助制备及其在染料去除中的应用

摘要 壳聚糖/氧化锌纳米复合材料（CS/ZnO 纳米复合材料）可以通过不同的物理和化学方法制备，用于各种应用。微波加热技术用于化学制备 CS/ZnO 纳米复合材料，因为与常规加热相比，反应所需的时间更短。根据时间（4、7、10、12、15 分钟）和微波功率（90,360,600, 800 W）的函数制备了一系列 CS/ZnO 纳米复合材料，以确定制备技术的最佳条件。结果表明，800 W 功率和 10 分钟时间是制备过程的最佳条件。FT-IR、XRD、TEM、DLS 和 UV-Vis 被用作制备的纳米复合材料的光谱表征。结果证实纳米复合材料是通过氧化锌纳米颗粒的表面锌阳离子与壳聚糖（CS）官能团之间的络合反应制备的。TGA 分析表明，与纯 CS 相比，纳米复合材料的热性能有所提高。此外，研究了制备的纳米复合材料去除亚甲基蓝染料的效率，并与纯 CS 进行了比较。研究染料浓度、材料浓度、pH 值和接触时间，以评估去除染料的最佳条件。结果表明，CS/ZnO 纳米复合材料和 CS 去除 MB 染料的最佳条件是染料浓度为 20 mg/L，pH 值为 60 mg/L 的材料浓度为 60 分钟。在这些条件下，ZnO 纳米颗粒对 CS 的改性将 MB 染料去除率从 81% 提高到 96.7%。