Dolai Susmita, Bhunia Susanta Kumar, Zeiri Leila, Paz-Tal Ofra, Jelinek Raz
Department of Chemistry and Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva 84105, Israel.
Chemistry Department, Nuclear Research Center, Negev, P.O. Box 9001, Beer Sheva 84190, Israel.
ACS Omega. 2017 Dec 29;2(12):9288-9295. doi: 10.1021/acsomega.7b01883. eCollection 2017 Dec 31.
Contamination of groundwater with radioactive substances comprising actinides and lanthanides is a significant environmental hazard and thus the development of selective, sensitive, and easy-to-apply sensors for water-soluble actinide and lanthanide ions is highly sought. We constructed a new selective fluorescent sensor for UO , Sm, and Eu based on a carbon dot (C-dot)-aerogel hybrid prepared through in situ carbonization of 2-thenoyltrifluoroacetone (TTA), a high-affinity heavy metal chelator. The TTA-C-dot-aerogel enabled the detection of UO ions, which induced a significant red fluorescence shift, whereas Eu and particularly Sm ions gave rise to pronounced fluorescence quenching. Importantly, the lanthanide/actinide ion-selective TTA-C-dots could be synthesized only in situ inside the aerogel pores, indicating the crucial role of the aerogel host matrix both in enabling the formation of the C-dots and in promoting the adsorption and interactions of the lanthanide and actinide metal ions with the embedded C-dots.
含有锕系元素和镧系元素的放射性物质对地下水的污染是一个重大的环境危害，因此，人们迫切需要开发用于水溶性锕系元素和镧系元素离子的选择性、灵敏且易于应用的传感器。我们基于通过高亲和力重金属螯合剂2-噻吩甲酰三氟丙酮（TTA）原位碳化制备的碳点（C点）-气凝胶杂化物，构建了一种用于UO、Sm和Eu的新型选择性荧光传感器。TTA-C点-气凝胶能够检测UO离子，该离子会引起明显的红色荧光位移，而Eu离子尤其是Sm离子会导致明显的荧光猝灭。重要的是，镧系元素/锕系元素离子选择性的TTA-C点只能在气凝胶孔内原位合成，这表明气凝胶主体基质在促进C点形成以及促进镧系元素和锕系元素金属离子与嵌入的C点的吸附和相互作用方面都起着关键作用。
