ZIF-8封装AuNCs荧光传感器用于铁离子的检测

介绍一个适合于本科教学使用的综合创新实验,设计合成了一种荧光传感器Au NCs@ZIF-8,并将其用于铁离子(Fe^(3+))的检测。MOFs具有高效吸附、聚集检测物的特点,因此选择将Au NCs封装到ZIF-8中,从而实现目标物的定量检测。封装后,由于Au NCs具有AIE特性,所以Au NCs@ZIF-8的荧光强度明显增强。ZIF-8是一种多孔材料,加入Fe^(3+)后,Fe^(3+)能够进入ZIF-8内部,导致Au NCs的荧光被Fe^(3+)猝灭,成功用于实际水样中Fe^(3+)的检测。尽管该实验步骤复杂并涉及新型纳米材料的合成和表征,但它成功地整合了无机化学、分析化学以及材料化学的相关知识,且操作难度适宜。这为提升学生的动手能力和科技前沿理解提供了一次宝贵的机会。

模块化紫外可见光谱仪的搭建及在分光光度法测定铝实验教学中的应用

本工作中搭建了一种模块化紫外可见光谱仪,并设计了配套的教学实验用于分光光度法测定食品中的铝。该内容可作为仪器分析实验课的新增内容,学生在动手搭建仪器的过程中,不但提高了学习兴趣和主动性,而且对于仪器的原理和构造等可以有更深层次的了解,有助于培养学生的动手能力和创新思维。

游泳池水中氰尿酸快速检测仪性能评价

对游泳池水中氰尿酸快速检测仪的反应时间、线性、试剂批次、不同操作人员对检测结果的影响,以及仪器波长示值误差和重复性、仪器示值误差和重复性以及样品加标回收率等性能指标进行了系统的考察。实验结果表明:氰尿酸在20.0~100.0 mg/L检测范围内时,检测仪标准曲线的线性相关系数r大于0.9998;不同批次试剂检测相对误差小于±5%;不同操作人员检测同一样品的相对误差小于±10%;3台检测仪波长示值误差范围为-0.05 nm~0.53 nm,波长重复性范围为0.02 nm~0.05 nm;3台仪器设备对20.00 mg/L和50.00 mg/L两浓度标准溶液测定的示值误差均小于±5%,重复性均小于5%;水样的低、中、高浓度加标回收率范围为86.3.0%~111.6%。

基于酸性离子液体填充注射器的泡腾辅助微萃取法测定果汁样品中三嗪类除草剂（英文）

开发了一种高效、环保的基于酸性离子液体填充注射器的泡腾辅助微萃取法,用于测定果汁样品中三嗪类除草剂。萃取分散采用酸性离子液体[C4mim][HSO4],它对三嗪类除草剂具有较高的溶解度,其酸性可与碳酸盐反应产生二氧化碳,从而加速萃取过程。该实验的提取和分离步骤在注射器中完成,整个预处理过程完全不需要任何设备辅助。对碳酸氢钠用量、酸性离子液体用量、盐添加量及洗脱溶剂体积等影响萃取效率的实验条件进行了优化。在最佳条件下,三嗪类除草剂浓度在1~200 ng/mL范围内获得了良好的线性关系,相关系数大于0. 9984;检出限(LOD)和定量限(LOQ)分别为0. 06~0. 18和0. 21~0. 61 ng/mL,日间及日内精密度低于8. 3%。实验结果表明,该方法可用于果汁样品中三嗪类除草剂的测定。

A Highly Selective and Sensitive Ratiometric Fluorescent Probe for pH Measurement Based on Fluorescence Resonance Energy Transfer

Fluorescein-rhodamine 6G（Flu-Rh） was synthesized and used as the fluorescence probe for pH measurement based on fluorescence resonance energy transfer（FRET）. In the probe, fluorescein fluorophore and pH-sensitive rhodamine 6G hydrazide were used as FRET donor and acceptor, respectively. The values of acidity constant（pKa） and fluorescence quantum yield（Ф） of Flu-Rh were 3.71 and 0.72, respectively. The fluorescence efficiency of Flu-Rh remains almost constant when the pH value of the sample solution changed 10 times in a range of 4.78-7.03 continuously. The present probe is simple and easy-to-use for the pH measurement in acidic media.

Fabrication of the Metal-Organic Framework Membrane with Excellent Adsorption Properties for Paraben Based on Micro Fibrillated Cellulose

A kind of novel environmental-friendly composite absorbent material was designed and prepared in this paper.Nanoscale metal-organic frameworks(MOFs)were embedded in the skeleton of cotton micro fibrillated cellulose.By scanning electron microscope(SEM),we observed that a large number of MOFs were attached to the cellulose skeleton.In addition,under the condition of 1800 r/min vortex,the structure of the composite material was stable and was not easily damaged by external forces.The water contact angle test showed that the composite material had excellent hydrophilicity and could be used for the adsorption of pollutants.Then,the material was characterized by energy dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and BET adsorption.Through verification,the material had very stable reusability(n=10).The composite material was applied to the solid phase extraction of water samples,such as rain water,toning water and fruit juice,and was quantitatively analyzed by high performance liquid chromatography(HPLC)-UV.This method was then applied to the extraction of four parabens(methyl-,ethyl-,propyl-,and butylparaben)from real samples,yielding limits of detection(LODs)of 0.29-0.58 ng/mL.The linear range was 2-500 ng/mL.The inter-day and intra-day recoveries were 90.7%-106.0%and 87.1%-109.3%,respectively(relative standard deviation<10.8%).