Liu Hanbin,Yang Xiaohan,Wang Jiaxi,Meng Qingjun,Qian Liwei,Wu Haiwei,Duan Chao,Li Zhijian,Zhou Hongwei
Abstract Separation of dyes and proteins from water remains a significant challenge. Common absorbents without recyclability might bring secondary pollutions, which may be avoided by developing stimuli-responsive smart absorbents. Here in this work, a CO 2 -responsive polymer poly(2-(dimethylamino) ethyl methacrylate) was grafted from cellulose fibers (Cell-g-PDEA). The chemical structure and surface morphology were confirmed with nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction and scanning electron microscope. The CO 2 -sensitivity was demonstrated by monitoring the pH, surface Zeta potential and dispersed appearance under stimulus of CO 2 . Furthermore, the modified cellulose fibers were packed into a syringe to construct a smart separation column that reversibly captured and released anionic dyes and proteins from water under gas stimulus. Comparing with traditional pH or temperature responsive materials, the CO 2 -responsive cellulose fibers take the advantages on energy-saving, good reversibility and moderate running conditions, thus might find applications in smart separations, clinical diagnose and therapies. Graphic abstract
Bo-Wen TIAN,Fei FENG,Bin ZHAO,Fan LUO,Xue-Lei YANG,Hai-Mei ZHOU,Xin-Xin LI
A monolithic micro gas chromatography (μGC) chip which integrated the micro separation column (μSC) and the micro thermal conductivity detector (μTCD) based on MEMS (Micro-electro-mechanical systems) technique was fabricated. Compared to the state of the art, the μSC with high depth-to-width ratio channels that was coated with mesoporous silica nanoparticles as stationary phase could effectively improve the column capacity and separation performance. Besides, the stable suspending μTCD, which was designed and fabricated in two ports of the μGC chip, could availably enhance the thermal isolation and reliability of the device. The mixture of light hydrocarbons (methane, ethane, propane and butane) could be separated from each other and detected by this monolithic integrated μGC chip, in which the overall analysis and detection time was only 33 seconds, the separation resolution of ethane and propane was 8.34, and the number of theoretical plate was as high as 11420. The monolithic integrated μGC chip has many advantages such as good separation resolution, high column efficiency and short analysis time, and is suitable for portable gas chromatographic field and onsite detection.
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