发光
检出限
琼脂
吸附
核化学
材料科学
离子
水溶液中的金属离子
兴奋剂
化学计量学
铽
铀
化学
无机化学
色谱法
有机化学
细菌
光电子学
生物
遗传学
冶金
作者
Hongjuan Liu,Xianli Wang,Weijie Xiong,Yuanbing Mao
标识
DOI:10.1016/j.materresbull.2022.111850
摘要
Uranium is a hazardous radioactive pollutant commonly produced from nuclear energy development and nuclear accidents. It has posed a potentially serious threat to the environment and human health. Thus, it is crucial to develop adsorptive sensors for adsorbing and detecting uranium in the environment. Here, we have synthesized a novel eco-friendly luminescent Tb-doped Ca-deficient hydroxyapatite utilizing agar as a template (denoted as “Tb-DEF-HAP/agar”) to sensitively and selectively adsorb and detect UO22+ ion. Ca2+ vacancy defects within the crystal structure of the Tb-DEF-HAP/agar can be tuned by changing the (Tb+Ca)/P molar ratio of the precursors, which adjusts its luminescence performance. The Tb-DEF-HAP/agar shows fluorescence intensity 3.6 times of the Tb-doped HAP synthesized with stoichiometric (Tb+Ca)/P (denoted as “Tb-HAP/agar”). The Tb-DEF-HAP/agar adsorbs and detects UO22+ ion sensitively with an ultra-low limit of detection of 27.2 nM and shows high selectivity over various other tested metal ions. Moreover, we have investigated the luminescent adsorbing and sensing mechanism of the Tb-DEF-HAP/agar as an adsorptive sensor for UO22+ ion. Our work provides new and valuable insights for the future development of excellent biodegradable rare earth (RE) doped HAP-based luminescent adsorptive sensors by tailoring their chemical composition such as (RE+Ca)/P molar ratios.
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