Roostaie Ali, Haddad Reza, Haji Abdolrasouli Mehdi
Department of Police Equipment and Technologies, Policing Sciences and Social Studies Institute, Tehran, Iran.
Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Hormozgan, Bandar-Abbas, Iran.
Anal Sci. 2024 Apr;40(4):719-729. doi: 10.1007/s44211-024-00510-0. Epub 2024 Feb 7.
In this research, a high efficiency and environmentally friendly method to reduce nitrophenol compounds such as 4-nitrophenol (4-NP), 2,4,6-trinitrophenol (2,4,6-TNP) and 2,4-dinitrophenol (2,4-DNP) was used in the presence of poly(lactic acid)/chitosan-ZnO ( PLA/CS-ZnO) bionanocomposite. Using FT-IR, SEM, XRD and UV-Vis techniques, PLA/CS-ZnO bionanocomposite was identified after synthesis. Also, the mechanical properties of the bionanocomposite were investigated using the stress-strain curve. The mentioned bionanocomposite showed a very good efficiency in reducing nitrophenol compounds to aminophenolic compounds, so that under optimal conditions, 100% conversion and selectivity in the reduction of 4-NP, 2,4,6-TNP and 2,4-DNP to 4-aminophenol (4-AP), 2,4,6-triaminophenol (2,4,6-TAP) and 2,4-diaminophenol (2,4-DAP) were observed. UV-Vis absorption spectrum at different times were used to evaluate the progress of the reaction. Furthermore, after the reaction, PLA/CS-ZnO was recovered and used for the next cycle. The results showed that the bionanocomposite can perform ten consecutive cycles without a significant decrease in efficiency. The comparison of catalytic activity with other catalysts showed that the bionanocomposite synthesized in the present research has a higher efficiency in reduction of nitrophenol compounds.
在本研究中，采用了一种高效且环保的方法，在聚乳酸/壳聚糖-氧化锌（PLA/CS-ZnO）生物纳米复合材料存在的情况下还原4-硝基苯酚（4-NP）、2,4,6-三硝基苯酚（2,4,6-TNP）和2,4-二硝基苯酚（2,4-DNP）等硝基酚化合物。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线衍射（XRD）和紫外可见光谱（UV-Vis）技术，在合成后对PLA/CS-ZnO生物纳米复合材料进行了鉴定。此外，使用应力-应变曲线研究了该生物纳米复合材料的力学性能。上述生物纳米复合材料在将硝基酚化合物还原为氨基酚化合物方面表现出非常好的效率，以至于在最佳条件下，观察到4-NP、2,4,6-TNP和2,4-DNP分别还原为4-氨基酚（4-AP）、2,4,6-三氨基酚（2,4,6-TAP）和2,4-二氨基酚（2,4-DAP）的转化率和选择性均为100%。利用不同时间的紫外可见吸收光谱来评估反应进程。此外，反应后回收PLA/CS-ZnO并用于下一个循环。结果表明，该生物纳米复合材料可以连续进行十个循环而效率无显著下降。与其他催化剂的催化活性比较表明，本研究中合成的生物纳米复合材料在还原硝基酚化合物方面具有更高的效率。
