Misr University for Science and Technology, 6 October, Giza, 12566, Egypt.
Department of Physics, Faculty of Science, Suez University, Suez, 43518, Egypt.
Environ Sci Pollut Res Int. 2023 Sep;30(44):99789-99808. doi: 10.1007/s11356-023-28999-4. Epub 2023 Aug 24.
Efficient cleaning of contaminated water by photocatalysis has become an effective strategy in recent years due to its environmental and ecological designation. Cadmium sulfate (CdS) is an excellent photocatalyst in the visible region but has low quantum efficiency. In order to increase the photocatalytic efficiency, CdS was modified with gadolinium oxide (GdO) and combined with graphene oxide (GO) nanoparticles. The estimated crystallite size (D) for GdO, CdS/GdO, and CdS/GdO@GO was 29.6, 11.6, and 11.5 nm, respectively. The degradation of methylene blue (MB) reaches the highest values after 60 min under visible light irradiation with a dye concentration of (0.25 ppm). Whereas in powdered composition the efficiency of dye removal has been enhanced under UV irradiation, it reduced by increasing the MB concentration to 0.50 ppm with visible light irradiation. In addition, the CdS with/without GdO and GO were integrated into electrospun nanofibrous cellulose acetate (CA) through the electrospinning technique. The compounds of GdO, CdS/GdO, and CdS/GdO/GO were encapsulated into CA nanofibers for the degradation of MB under visible and UV irradiation. The apparent rate constant (k) achieves a value of 0.006, 0.007, and 0.0013 min while the removal efficiency reaches 41.02%, 54.71%, and 71.42% for GdO@CA, CdS/GdO@CA, and CdS/GdO/GO@CA, respectively, after 60 min under UV irradiation.
近年来，由于光催化具有环境和生态设计，因此通过光催化有效清洁受污染的水已成为一种有效策略。硫酸镉（CdS）是可见光区域中的一种出色的光催化剂，但量子效率低。为了提高光催化效率，用氧化钆（GdO）对 CdS 进行了修饰，并与氧化石墨烯（GO）纳米粒子结合。GdO、CdS/GdO 和 CdS/GdO@GO 的估计晶粒度（D）分别为 29.6、11.6 和 11.5nm。在可见光照射下，染料浓度为（0.25ppm）时，亚甲基蓝（MB）的降解在 60 分钟后达到最高值。然而，在粉末组成中，在 UV 照射下增强了染料去除的效率，而在可见光照射下将 MB 浓度增加到 0.50ppm 时，效率降低。此外，通过静电纺丝技术将 CdS 与/或没有 GdO 和 GO 集成到电纺纳米纤维醋酸纤维素（CA）中。在可见光和 UV 照射下，将 GdO、CdS/GdO 和 CdS/GdO/GO 的化合物封装到 CA 纳米纤维中以降解 MB。在 UV 照射 60 分钟后，GdO@CA、CdS/GdO@CA 和 CdS/GdO/GO@CA 的表观速率常数（k）分别达到 0.006、0.007 和 0.0013min，去除效率分别达到 41.02%、54.71%和 71.42%。
