Long Caicheng, Li Xiao, Jiang Zixin, Zhang Peng, Qing Zhihe, Qing Taiping, Feng Bo
College of Environment and Resources, Xiangtan University, Xiangtan 411105, Hunan, China.
College of Chemistry, Nankai University, Tianjin 300110, China.
J Hazard Mater. 2021 Jul 5;413:125470. doi: 10.1016/j.jhazmat.2021.125470. Epub 2021 Feb 19.
Water pollution arising from heavy metal ions continues to be a major environmental problem, which represents a serious threat to human beings and animals worldwide. New materials that can simultaneously detect and remove these toxic ions are urgently required. Herein, nitrogen and sulfur co-doped molybdenum selenide nanosheets (N, S-MoSe) were prepared and found to be fluorescently responsive to mercury (II) with an improved adsorption capacity (208.33 mg g), thereby providing the possibility for the simultaneous detection and removal of mercury (II) in water samples. The great affinity was the result of the complexation of mercury (II) with Se and S atoms in N, S-MoSe as well as the electrostatic adsorption of cation mercury (II) on negatively charged N, S-MoSe. Besides good sensitivity and selectivity toward mercury (II), N, S-MoSe displayed a relatively consistent performance under a wide pH range from 3 to 10. The removal efficiency reached 87.5% with fast adsorption kinetics, and N, S-MoSe could be reused after simple treatment. Thus, this work is expected to provide new material for the detection and removal of mercury (II) in an aqueous solution and offer an insight into the interaction between heavy metal ions and inorganic nanomaterials.
重金属离子引起的水污染仍然是一个主要的环境问题，对全球人类和动物构成严重威胁。迫切需要能够同时检测和去除这些有毒离子的新材料。在此，制备了氮和硫共掺杂的硒化钼纳米片（N，S-MoSe），发现其对汞（II）具有荧光响应，吸附容量有所提高（208.33 mg g），从而为同时检测和去除水样中的汞（II）提供了可能性。这种强亲和力是汞（II）与N，S-MoSe中的硒和硫原子络合以及阳离子汞（II）在带负电荷的N，S-MoSe上静电吸附的结果。除了对汞（II）具有良好的灵敏度和选择性外，N，S-MoSe在3至10的宽pH范围内表现出相对一致的性能。去除效率达到87.5%，吸附动力学快，N，S-MoSe经过简单处理后可重复使用。因此，这项工作有望为水溶液中汞（II）的检测和去除提供新材料，并深入了解重金属离子与无机纳米材料之间的相互作用。
