Aadnan Imane, Zegaoui Omar, El Mragui Abderrahim, Esteves da Silva Joaquim Carlos Gomes
Research Team "Materials and Applied Catalysis: MCA", CBAE Laboratory, URL-CNRST N°13, Faculty of Sciences, Moulay Ismail University of Meknes, P.O. Box 11201 Zitoune, Meknès 50700, Morocco.
(UP)-Research Center in Chemistry, DGAOT, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal.
Nanomaterials (Basel). 2021 Dec 29;12(1):102. doi: 10.3390/nano12010102.
In this investigation, a hybrid-biocomposite "ZnO-Bentonite/Chitosan" was synthesized using inexpensive and environmentally friendly materials (Bentonitechitosan) and (ZnO). It was used as a photocatalyst for water remediation. The structural, optical, thermal, and morphological properties of the synthesized hybrid-biocomposite were investigated using XRD, FTIR spectroscopy, UV-vis diffuse reflectance spectroscopy, TGA, XPS, and SEM-EDS. The thermal measurements showed that the decomposition of CS was postponed progressively by adding PB and ZnO, and the thermal stability of the synthesized hybrid-biocomposite was improved. The characterization results highlighted strong interactions between the C-O, C=O, -NH, and OH groups of chitosan and the alumina-silica sheets of bentonite on the one side, and between the functional groups of chitosan (-NH, OH) and ZnO on the other side. The photocatalytic efficiency of the prepared hybrid-biocomposite was assessed in the presence of Methyl Orange (MO). The experiments carried out in the dark showed that the MO removal increased in the presence of Zn-PB/CS hybrid-biocomposite (86.1%) by comparison with PB (75.8%) and CS (65.4%) materials. The photocatalytic experiments carried out under visible light showed that the MO removal increased 268 times in the presence of Zn-PB/CS by comparison withZnO.The holes trapping experiments indicated that they are the main oxidative active species involved in the MO degradation under both UV-A and visible light irradiations.
在本研究中，使用廉价且环保的材料（膨润土/壳聚糖）和（氧化锌）合成了一种杂化生物复合材料“氧化锌-膨润土/壳聚糖”。它被用作水修复的光催化剂。使用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、紫外-可见漫反射光谱（UV-vis）、热重分析（TGA）、X射线光电子能谱（XPS）和扫描电子显微镜-能谱分析（SEM-EDS）对合成的杂化生物复合材料的结构、光学、热学和形态学性质进行了研究。热学测量表明，通过添加膨润土和氧化锌，壳聚糖的分解逐渐延迟，合成的杂化生物复合材料的热稳定性得到提高。表征结果突出了壳聚糖的C-O、C=O、-NH和OH基团与膨润土的氧化铝-二氧化硅片层之间一方面的强相互作用，以及壳聚糖的官能团（-NH、OH）与氧化锌之间另一方面的强相互作用。在甲基橙（MO）存在的情况下评估了制备的杂化生物复合材料的光催化效率。在黑暗中进行的实验表明，与膨润土（75.8%）和壳聚糖（65.4%）材料相比，锌-膨润土/壳聚糖杂化生物复合材料存在时MO的去除率有所提高（86.1%）。在可见光下进行的光催化实验表明，与氧化锌相比，锌-膨润土/壳聚糖存在时MO的去除率提高了268倍。空穴捕获实验表明，它们是在UV-A和可见光照射下参与MO降解的主要氧化活性物种。
