通过在阳离子结构中引入铀酰离子萃取剂磷酸三丁酯(TBP)的功能结构,设计合成了两种咪唑型离子液体,使该离子液体在硝酸介质中萃取铀酰离子时,既是稀释剂又具有萃取剂功能。利用傅里叶红外光谱(FTIR)、核磁共振(1 H NMR)和元素分析,对合...通过在阳离子结构中引入铀酰离子萃取剂磷酸三丁酯(TBP)的功能结构,设计合成了两种咪唑型离子液体,使该离子液体在硝酸介质中萃取铀酰离子时,既是稀释剂又具有萃取剂功能。利用傅里叶红外光谱(FTIR)、核磁共振(1 H NMR)和元素分析,对合成的离子液体结构进行了确认,并对硝酸介质中萃取铀酰离子进行了初步研究。结果表明:室温条件下,所合成的具有特定功能的离子液体可在硝酸介质中萃取铀酰离子,萃取率可达90%以上。展开更多
The uranyl ion(UO22+) poses high risks to human health and the environment, hence its detection and monitoring is of utmost significance. However, the development of an ultra-sensitive, high-efficiency and convenient ...The uranyl ion(UO22+) poses high risks to human health and the environment, hence its detection and monitoring is of utmost significance. However, the development of an ultra-sensitive, high-efficiency and convenient approach for on-site detection of UO22+ remains a challenge. Herein, a reliable and reusable surface-enhanced Raman spectroscopy(SERS)-based microfluidic biosensor was developed for rapid detection of UO22+ in real samples. The detection protocol involved the reaction of 5′-Rhodamine B(RhB)-labeled double-stranded DNA for UO22+-specific DNAzyme-cleavage reaction in a U-shaped microchannel. Then, the reaction products were delivered into three parallel samples for high-throughput tests by SERS biochips,where 3 D ZnO-Ag mesoporous nanosheet arrays(MNSs) were modified with a single-stranded DNA(ssDNA). The ssDNAwas sequence-complementary with the 5′-RhB-labeled cleaved-stranded DNA(csDNA) from the reaction products. By the hybridization of ssDNA and csDNA, the signal probe RhB was fixed close to the surface of the ZnO-Ag MNSs to enhance the Raman signal. The limit of detection for UO22+ with the microfluidic-SERS biosensor was 3.71×10-15 M. An over 20,000-fold selectivity towards UO22+ response was also achieved in the presence of 15 other metal ions. The high-throughput microfluidicSERS biosensor operated well for practical UO22+ detection, with excellent recoveries in contaminated river and tap water from95.2% to 106.3%(relative standard deviation(RSD)<6.0%, n=6). Although the SERS-based microfluidic biosensor developed in this study was deployed for the detection of UO22+, the reusable and high-efficiency system may be expanded to the detection of other analytes on-site.展开更多
文摘通过在阳离子结构中引入铀酰离子萃取剂磷酸三丁酯(TBP)的功能结构,设计合成了两种咪唑型离子液体,使该离子液体在硝酸介质中萃取铀酰离子时,既是稀释剂又具有萃取剂功能。利用傅里叶红外光谱(FTIR)、核磁共振(1 H NMR)和元素分析,对合成的离子液体结构进行了确认,并对硝酸介质中萃取铀酰离子进行了初步研究。结果表明:室温条件下,所合成的具有特定功能的离子液体可在硝酸介质中萃取铀酰离子,萃取率可达90%以上。
文摘寻找具有高效、高吸附量、高选择性的吸附剂处理放射性的含铀废水,对环境保护具有现实意义.通过溶剂热法合成两种金属有机框架材料MIL-125和NH2-MIL-125,并用X-射线衍射仪(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、热重分析仪(TGA/DSC)等仪器对两种材料的结构和形貌分别进行表征,探究不同的初始pH、初始铀浓度、吸附时间等条件下两种材料分别对UO2^2+吸附性能的影响.结果表明:本实验成功合成了MIL-125和NH2-MIL-125两种材料;当初始pH分别为5和8时,MIL-125和NH2-MIL-125材料对UO2^2+的吸附效果最好.通过Langmuir和Freundlich方程进行热力学拟合可知,两种材料的吸附过程更符合Langmuir方程,在25℃时MIL-125、NH2-MIL-125对UO2^2+的最大吸附量分别为264.4 mg·g^-1和327.3 mg·g^-1,最佳吸附时间分别为480 min和70 min.
基金supported by the Science Challenge Project (TZ2018004)the National Natural Science Foundation of China (21502179)
文摘The uranyl ion(UO22+) poses high risks to human health and the environment, hence its detection and monitoring is of utmost significance. However, the development of an ultra-sensitive, high-efficiency and convenient approach for on-site detection of UO22+ remains a challenge. Herein, a reliable and reusable surface-enhanced Raman spectroscopy(SERS)-based microfluidic biosensor was developed for rapid detection of UO22+ in real samples. The detection protocol involved the reaction of 5′-Rhodamine B(RhB)-labeled double-stranded DNA for UO22+-specific DNAzyme-cleavage reaction in a U-shaped microchannel. Then, the reaction products were delivered into three parallel samples for high-throughput tests by SERS biochips,where 3 D ZnO-Ag mesoporous nanosheet arrays(MNSs) were modified with a single-stranded DNA(ssDNA). The ssDNAwas sequence-complementary with the 5′-RhB-labeled cleaved-stranded DNA(csDNA) from the reaction products. By the hybridization of ssDNA and csDNA, the signal probe RhB was fixed close to the surface of the ZnO-Ag MNSs to enhance the Raman signal. The limit of detection for UO22+ with the microfluidic-SERS biosensor was 3.71×10-15 M. An over 20,000-fold selectivity towards UO22+ response was also achieved in the presence of 15 other metal ions. The high-throughput microfluidicSERS biosensor operated well for practical UO22+ detection, with excellent recoveries in contaminated river and tap water from95.2% to 106.3%(relative standard deviation(RSD)<6.0%, n=6). Although the SERS-based microfluidic biosensor developed in this study was deployed for the detection of UO22+, the reusable and high-efficiency system may be expanded to the detection of other analytes on-site.
