Hua Liang,Zongchen Li,Daqiang Wu,Ke Dai,Luyao Zhong,Yonggang Liu,Minhao Yan,Xianguo Tuo
Structure is a crucial factor to decide the selectivity and sensitivity of chemosensors. In this work, a diacylhydrazone 2a and its congeneric derivatives 2b-2d were synthesized and their applications for Al 3+ detection were investigated. Except 2d , all the other compounds exhibit notable turn-on fluorescence toward Al 3+ over 15 other metal ions and the sensitivities of 2b and 2c are even higher after modification, illustrating ortho -OH indispensability in their structures for sensing. Reversibility investigation shows that the sensors all have regeneration ability. Meanwhile, the sensor-Al 3+ systems show selective fluorescence turn-off for Cu 2+ , providing a potential platform for tandem recognition of Al 3+ and Cu 2+ . 2a as a standard, shows a 1:2 molar ratio to Al 3+ confirmed by Job’s plot, 1 H NMR spectra and mass spectra, and its detection limit for Al 3+ is 7.63 nM in ethanol. It has relevant sensitivity over pH 3-9, with the highest sensitivity at around pH 4. Apart from Al 3+ detection, anion selectivity was also explored and it shows that 2a , 2b and 2c all have selectivity toward CN − evidenced by UV-vis spectra.
Xueling Wang,Weiwei Bai,Man Wang,Jing Wang,Chuyang Y. Tang,Yatao Zhang
Membrane technology has been being widely employed in wastewater treatment in recent years. Developing high-permeability and high-selectivity separation membrane is a key to expand their applications. In practice, biofouling often has a negative effect on membrane performance and membrane life span. Therefore, it is urgently needed to develop novel high-performance separation membrane with fast water molecular transport channel and excellent anti-bacterial properties. Owing to the abundant water molecular transport provided by ortho -hydroxyazo-linked porous organic polymer ( o -POP) with polar functional groups and high hydrophilicity, and the excellent anti-bacteria and abundant oxygen-containing functional groups of graphene oxide (GO) material, high stable o -POP/GO composite membrane with abundant transport channel was constructed on a nylon substrate via simple in situ method in this work. The synergistic effect of o -POP and GO effectively improved the ability of water transport and anti-bacteria performance of the composite membrane. The o -POP/GO composite membrane not only possessed high water permeability of 151.3 L m –2 h −1 bar −1 and excellent dye rejection (Evans blue (EB): 96.3 %, Methyl blue (MB): 98.0 %, Congo red (CR): 99.0 %, Eriochrome black T (EBT): 97.3 %, Methyl orange (MO): 71.5 %), but also exhibited positive anti-bacterial effect for Escherichia coli.
危险品化学品经营许可证（带存储）