Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, 11757, Egypt.
Nanoscience Laboratory for Environmental and Biomedical Applications (NLEBA), Metallurgical Lab.1., Department of Physics, Faculty of Education, Ain Shams University, Roxy, Cairo, 11757, Egypt.
Environ Sci Pollut Res Int. 2020 Dec;27(36):45225-45237. doi: 10.1007/s11356-020-10305-1. Epub 2020 Aug 12.
In this study, poly(methyl methacrylate) with different doping nano-cadmium sulfide (CdS/PMMA) is prepared and characterized. CdS/PMMA polymeric nanocomposite films were synthesized using solution casting methodology. SEM and XRD are used for structure analysis for the studied nanocomposite films. XRD revealed the amorphous domains of PMMA polymer, which increased with increasing CdS nanoparticle contents. SEM revealed the CdS dispersion within the PMMA matrix. CdS nanoparticles in the PMMA matrix are expected to be aggregated due to the casting technique. The optical energy gap is found to be decreased after the CdS addition. ε' and ε″ have the same behavior with the applied frequency. Maxwell-Wagner interfacial polarization is the responsible factor for higher values of ε'-ε″ at the higher frequencies. Electrical conductivity behavior σ tends to obtain a constant value at lower frequencies that approach from its DC conductivity values. After doping PMMA with nano-CdS, an exponential increase after a critical frequency value and the values of σ was also increased. Besides, a significant reduction in laser energy power is identified by the reduction of the output power. CdS/PMMA can attenuate the laser power due to its nonlinear effect. CdS/PMMA nanocomposite can act as a photocatalyst to improve the performance of the photodegradation of Rhodamine B (RhB). Among the different CdS/PMMA nanocomposite films, 3.33 wt% CdS/PMMA demonstrates the highest efficiency in visible photocatalysis of Rhodamine B. CdS/PMMA can be utilized as multifunctional materials use like laser optical limiting to reduce the power of laser sources and as a photocatalyst membranes.
在这项研究中，制备并表征了不同掺杂纳米硫化镉（CdS/PMMA）的聚甲基丙烯酸甲酯（PMMA）。通过溶液浇铸法合成了 CdS/PMMA 聚合物纳米复合材料薄膜。使用 SEM 和 XRD 对研究的纳米复合材料薄膜进行结构分析。XRD 显示 PMMA 聚合物具有非晶区，随着 CdS 纳米颗粒含量的增加而增加。SEM 显示 CdS 在 PMMA 基体中的分散。由于铸造技术，PMMA 基体中的 CdS 纳米颗粒预计会聚集。添加 CdS 后，光学能隙减小。ε'和ε″随施加频率表现出相同的行为。Maxwell-Wagner 界面极化是导致较高频率下 ε'-ε″值较高的原因。电导率行为σ在较低频率下趋于接近其直流电导率值的恒定值。在 PMMA 中掺杂纳米 CdS 后，在临界频率值之后，σ值呈指数增长，并且σ值也增加。此外，由于其非线性效应，CdS/PMMA 可以衰减激光功率。CdS/PMMA 纳米复合材料可以作为光催化剂，提高 Rhodamine B（RhB）的光降解性能。在不同的 CdS/PMMA 纳米复合材料薄膜中，3.33wt%CdS/PMMA 在 Rhodamine B 的可见光光催化中表现出最高的效率。CdS/PMMA 可作为多功能材料使用，例如激光光限幅以降低激光源的功率和作为光催化剂膜。
