Du Teng, Chao Yue, Miao Zongcheng, Song Wenqi, Zhang Yifu, Meng Changgong
Xi'an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, Technological Institute of Materials & Energy Science (TIMES), Xijing University, Xi'an, 710123, PR China.
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, PR China.
Chemosphere. 2024 Aug;362:142612. doi: 10.1016/j.chemosphere.2024.142612. Epub 2024 Jun 15.
Water pollution and energy crisis are becoming global and strategic issues that people are closely concerned about. Green and energy-saving photocatalytic technology is developing rapidly in solving global energy crises and environmental pollution problems. Therefore, we propose the "kill two birds with one stone" strategy to design efficient photocatalysts for dye wastewater treatment by utilizing heavy metal ions in wastewater. The adsorption properties of Mordenite (MOR) were utilized to removal heavy metal ions (Cd and Zn) from waste water, and the adsorbed heavy metal ions were dried and sulfurized to obtain CdS/ZnS/MOR(ZnCdM). Then, g-CN was ultrasonically dispersed and composited with ZnCdM by self-assembly, 25 wt% ZnCdCM photocatalytic material was obtained with a degradation rate of 99.8% in 1.5 h for Rhodamine B(RhB). It was found that MOR can provid adequate support for active substances, and the surface of MOR with smaller sizes of CdS nanoparticles, ZnS nanoparticles and g-CN nanosheets, which increased the specific surface area of the materials and improved the reactivity. The porous structure of MOR is favorable for the enrichment of RhB, and the electric field effect of MOR leads to the decrease of the photogenerated carrier complex rate in the semiconductor, which increases the catalytic efficiency. In addition, the double Z charge transfer mechanism formed by CdS, ZnS, g-CN is favorable for separating photogenerated carriers. These synergistic effects improved the photocatalytic efficiency. This strategy will be a green and promising solution to water pollution and energy crisis.
水污染和能源危机正成为人们密切关注的全球性战略问题。绿色节能的光催化技术在解决全球能源危机和环境污染问题方面发展迅速。因此，我们提出“一石二鸟”策略，利用废水中的重金属离子设计用于处理染料废水的高效光催化剂。利用丝光沸石（MOR）的吸附性能去除废水中的重金属离子（镉和锌），将吸附的重金属离子干燥并硫化，得到CdS/ZnS/MOR（ZnCdM）。然后，将g-CN超声分散并通过自组装与ZnCdM复合，得到25 wt%的ZnCdCM光催化材料，其对罗丹明B（RhB）在1.5小时内的降解率为99.8%。研究发现，MOR能为活性物质提供足够的支撑，且MOR表面有尺寸较小的CdS纳米颗粒、ZnS纳米颗粒和g-CN纳米片，这增加了材料的比表面积并提高了反应活性。MOR的多孔结构有利于RhB的富集，MOR的电场效应导致半导体中光生载流子复合率降低，从而提高了催化效率。此外，CdS、ZnS、g-CN形成的双Z电荷转移机制有利于光生载流子的分离。这些协同效应提高了光催化效率。该策略将是解决水污染和能源危机的绿色且有前景的方案。
