Omar Asmaa M A, Hassen Arafa, Metwalli Ossama I, Saber Mohamed R, Mohamed Sayed R E, Khalil Ahmed S G
Physics Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt.
Chemistry Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt.
Nanotechnology. 2021 May 28;32(33). doi: 10.1088/1361-6528/abff8a.
In this work, heterostructures of coupled TiO@MoSwith different phases of MoSwere synthesized via hydrothermal technique. The prepared materials were thoroughly characterized using various techniques, including XRD, SEM, transmission electron microscopy, Brunauer-Emmet-Teller, XPS, Zeta potential and UV-vis spectroscopy. The optimized nanocomposites were tested for the photocatalytic degradation of methyl Orange (MO) under visible light as well as the adsorption of Rhodamine b (RhB) and methelene blue (MB) dyes. The TiO@1T/2H-MoSheterostructures exhibited a narrow bandgap compared to the other studied nanomaterials. A remarkable photodegradation efficiency of TiO@1T/2H-MoSwas observed, which completely degraded 20 ppm of MO after 60 min with high stability over four successive cycles. This can be assigned to the formation of unique heterostructures with aligned energy bands between MoSnanosheets and TiOnanobelts. The formation of these novel interfaces promoted the electron transfer and increased the separation efficiency of carriers, resulting in high photocatalytic degradation. Furthermore, the adsorption efficiency of TiO@1T/2H-MoSwas unique, 20 ppm solutions of RhB and MB were removed after 1 and 2 min, respectively. The superior adsorption performance of the TiO@1T/2H-MoScan be attributed to its high surface area (279.9 mg) and the rich concentration of active sites. The kinetics and the isothermal analysis revealed that the TiO@1T/2H MoSheterstructures have maximum adsorption capacity of 1200 and 970 mg gfor RhB and MB, respectively. This study provides a powerful way for designing an effective photocatalyst and adsorbent TiO-based nanocomposites for water remediation.
在本工作中，通过水热技术合成了具有不同相态MoS的耦合TiO@MoS异质结构。使用包括XRD、SEM、透射电子显微镜、Brunauer-Emmet-Teller、XPS、Zeta电位和紫外可见光谱等各种技术对制备的材料进行了全面表征。对优化后的纳米复合材料进行了可见光下甲基橙（MO）的光催化降解以及罗丹明B（RhB）和亚甲基蓝（MB）染料吸附的测试。与其他研究的纳米材料相比，TiO@1T/2H-MoS异质结构表现出较窄的带隙。观察到TiO@1T/2H-MoS具有显著的光降解效率，在60分钟内完全降解了20 ppm的MO，并且在四个连续循环中具有高稳定性。这可归因于在MoS纳米片和TiO纳米带之间形成了具有对齐能带的独特异质结构。这些新型界面的形成促进了电子转移并提高了载流子的分离效率，从而导致高光催化降解。此外，TiO@1T/2H-MoS的吸附效率独特，分别在1分钟和2分钟后去除了20 ppm的RhB和MB溶液。TiO@1T/2H-MoS优异的吸附性能可归因于其高表面积（279.9 mg）和丰富的活性位点浓度。动力学和等温分析表明，TiO@1T/2H-MoS异质结构对RhB和MB的最大吸附容量分别为1200和970 mg g。本研究为设计用于水修复的有效光催化剂和吸附剂TiO基纳米复合材料提供了一种有力的方法。
