التفاصيل البيبلوغرافية
| العنوان: |
具有优异光激发 NO2 气敏性能和 MB 光催 化降解效率的 ZnO-MoS2 纳米复合材料. (Chinese) |
| Alternate Title: |
ZnO-MoS2 nano-composites with excellent light-activated NO2 gas sensitivity and MB photocatalytic degradation efficiency. (English) |
| المؤلفون: |
孙翼飞, 余飞, 袁欢, 徐明, 张秋平, 宋曼, 黎健鸿, 柏明辉 |
| المصدر: |
Acta Materiae Compositae Sinica; Jun2023, Vol. 40 Issue 6, p3428-3440, 13p |
| مصطلحات موضوعية: |
SURFACE photovoltage, METHYLENE blue, GAS detectors, WATER pollution, SURFACE defects, PHOTOELECTRICITY |
| Abstract (English): |
Effective monitoring of toxic and harmful gases and rapid degradation of organic pollutants are essential to reduce the hazards of air and water pollution. In this study, the MoS2 nanosheets prepared by hydrothermal method were coupled into the ZnO nanoparticles prepared by sol-gel method to form ZnO-MoS2 nano-composites via a facile ultrasonic chemical route. The structure, morphology and surface chemical component of synthesized materials were characterized by XRD, SEM, TEM and XPS. The characterizations show that multilayer MoS2 nanosheets are well dispersed among ZnO nanoparticles, and ZnO-MoS2 composites have good crystallinity and abundant surface defects. The photoelectric properties were explored by UV-vis diffuse reflectance spectrum, photoluminescence spectra (PL) and surface photovoltage spectra (SPV). The results reveal that the formation of ZnOMoS2 heterostructure improves the utilization of light and promotes the effective separation of photo-carriers. The UV light-activated gas sensitivity test using NO2 as the target gas preformed at room temperature saw that the prepared ZnO-MoS2 gas sensor exhibited excellent gas sensing properties with good sensitivity, recoverability, stability and selectivity, which could effectively respond to low concentration NO2 . The response of the optimized ZnO-MoS2 sensor with 5wt%MoS2 to 0.47 mg/m³ NO2 reached 19.6%. Meanwhile, the gas sensing performance was found to be greatly influenced by the adsorption of O2 molecule on the surface of the materials, and ZnO-MoS2 gas sensor possessed much higher gas sensitivity to NO2 under oxygen free conditions. In addition, the photocatalytic degradation of methylene blue (MB) under simulated sunlight reveal that the ZnO-MoS2 composites can rapidly remove the high concentration of MB (15 mg/L) in aqueous solution within 40 min by combined action of adsorption and photocatalysis, thereinto, the ZnO-MoS2 sample with 10wt%MoS2 shows a reaction rate constant as high as 0.032 min−1 . Mechanism analysis shows that the improvement of gas sensing and photocatalytic performance of ZnO-MoS2 composites mainly attribute to the better absorbability of MoS2 and the promotion of photocarrier separation rate caused by combination. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
实现对有毒、有害气体的有效监测和对有机污染物的快速降解，对于减少大气污染和水污染所带来 的危害至关重要。本研究采用超声复合方法将溶胶凝胶法制备的 ZnO 和水热法制备的 MoS2 复合到一起，成 功制备了 ZnO-MoS2 纳米复合材料。采用 XRD、SEM、TEM、XPS 等手段对材料结构、形貌和表面化学组分 进行表征。结果表明，多层片状 MoS2 均匀负载到了 ZnO 纳米颗粒当中，复合材料具有较好的结晶性和丰富 的表面缺陷。利用紫外-可见 (UV-vis) 漫反射光谱、光致发光光谱 (PL) 和表面光电压 (SPV) 对材料的光电性 能进行了测试。结果表明，ZnO 与 MoS2 的复合在提升光利用率的同时，能够促进光生载流子的更有效分离。 以 NO2 作为目标气体的室温紫外光辅助气敏测试表明，本方法制备的 ZnO-MoS2 气体传感器具有良好的灵敏 度、恢复性、稳定性和选择性，可在室温下实现对低浓度 NO2 的有效响应，MoS2 复合量为 5wt% 的 ZnOMoS2 传感器对 0.47 mg/m3 NO2 的响应值为 19.6%。同时，气敏性能研究还发现空气中 O2 分子在材料表面的 吸附会对传感器的气敏性能产生较大的影响，ZnO-MoS2 传感器在无氧条件下对 NO2 具有更高的气敏响应。 此外，在模拟太阳光下进行的光催化降解亚甲基蓝 (MB) 的实验表明，依靠吸附和光催化降解的共同作用， ZnO-MoS2 复合材料能够在 40 min 内实现水溶液当中较高浓度 MB (15 mg/L) 的快速清除，MoS2 复合量为 10wt% 的 ZnO-MoS2 样品的反应速率常数达到了 0.032 min−1。对机制的分析表明，MoS2 较好的吸附性和复合 所导致的光生载流子分离率的提升是 ZnO-MoS2 复合材料气敏和光催化性能提升的关键。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |