在可见光照射下，用氮和 MoS 改性的 TiO 纳米粒子高效光催化降解有机污染物。

Efficient photocatalytic degradation of organic pollutants over TiO nanoparticles modified with nitrogen and MoS under visible light irradiation.

机构信息

Department of Analysis and Evaluation, Egyptian Petroleum Research Institute, Nasr City, 11727, Cairo, Egypt.

Sanitary and Environmental Institute (SEI), Housing and Building National Research Center (HBRC), Giza, 1770, Egypt.

出版信息

Sci Rep. 2023 May 31;13(1):8845. doi: 10.1038/s41598-023-35265-7.

Investigate the use of visible light to improve photocatalytic degradation of organic pollutants in wastewater. Nitrogen-doped titania and molybdenum sulfide nanocomposites (NTM NCs) with different weight ratios of MoS (1, 2, and 3 wt.%) synthesized by a solid state method applied to the photodegradation of methylene blue(MB) under visible light irradiation. The synthesized NTM composites were characterized by SEM, TEM, XRD, FT-IR, UV-Vis, DRS and PL spectroscopy. The results showed enhanced activity of NTM hybrid nanocrystals in oxidizing MB in water under visible light irradiation compared to pure TiO. The photocatalytic performance of NTM samples increased with MoS content. The results show that the photodegradation efficiency of the TiO compound improved from 13 to 82% in the presence of N-TiO and to 99% in the presence of MoS containing N-TiO, which is 7.61 times higher than that of TiO. Optical characterization results show enhanced nanocomposite absorption in the visible region with long lifetimes between e/h+ at optimal N-TiO/MoS (NTM) ratio. Reusable experiments indicated that the prepared NTM NCs photocatalysts were stable during MB photodegradation and had practical applications for environmental remediation.

研究利用可见光提高废水有机污染物的光催化降解。采用固态法合成了不同 MoS 重量比（1、2 和 3wt%）的氮掺杂二氧化钛和二硫化钼纳米复合材料（NTM NCs），用于可见光照射下亚甲基蓝（MB）的光降解。所合成的 NTM 复合材料通过 SEM、TEM、XRD、FT-IR、UV-Vis、DRS 和 PL 光谱进行了表征。结果表明，与纯 TiO 相比，NTM 杂化纳米晶体在可见光照射下氧化 MB 的活性增强。NTM 样品的光催化性能随 MoS 含量的增加而提高。结果表明，在 N-TiO 的存在下，TiO 化合物的光降解效率从 13%提高到 82%，在含有 MoS 的 N-TiO 的存在下提高到 99%，比 TiO 提高了 7.61 倍。光学特性研究结果表明，在最佳 N-TiO/MoS（NTM）比例下，纳米复合材料吸收可见光的能力增强，电子/空穴的寿命延长。可重复使用实验表明，所制备的 NTM NCs 光催化剂在 MB 光降解过程中稳定，在环境修复方面具有实际应用价值。