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Selective flotation of brucite from calcite using HEDP-4Na as an inhibitor in a SDS system
Xiufeng Gong,Jin Yao,Bin Yang,Yafeng Fu,Yulian Wang,Wanzhong Yin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
In this study, the selective adsorption of (1-hydroxyethylidene) bis-phosphonic acid tetrasodium salt(HEDP-4Na) on a calcite surface and its impact on the separation of brucite were examined using amicroflotation test, contact angle measurement, zeta potential measurement, X-ray photoelectron spectroscopy(XPS), and atomic force microscopy (AFM). The microflotation test revealed that HEDP-4Naselectively inhibited calcite from brucite at pH 10.5 in the sodium dodecyl sulfonate (SDS) system. Under the dosage condition of 180-mg/L HEDP-4Na, a single-mineral floating difference of 73.79% wasachieved between brucite and calcite. The contact angle measurement revealed that HEDP-4Na considerablyreduced the contact angle of calcite in the SDS system but only weakly affected the contact angleof brucite. Zeta potential analysis and Fourier transform infrared spectroscopy demonstrated that theHEDP-4Na adsorption interfered with the SDS adsorption on the surface of calcite; however, theHEDP-4Na adsorption had little effect on the SDS adsorption on the surface of brucite. XPS and AFM analysesdemonstrated that the selectivity and effect of HEDP-4Na on calcite were considerably stronger thanthose on brucite and the HEDP-4Na adsorption on the calcite surface was significant and strong.
Zhou, Xiufeng,Lu, Juan,Jiang, Jingjing,Li, Xiaobin,Lu, Mengna,Yuan, Guotao,Wang, Zuoshan,Zheng, Min,Seo, Hyo Jin Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P>N-doped mesoporous TiO<SUB>2</SUB> nanorods were fabricated by a modified and facile sol–gel approach without any templates. Ammonium nitrate was used as a raw source of N dopants, which could produce a lot of gasses such as N<SUB>2</SUB>, NO<SUB>2</SUB>, and H<SUB>2</SUB>O in the process of heating samples. These gasses were proved to be vitally important to form the special mesoporous structure. The samples were characterized by the powder X-ray diffraction, X-ray photoelectron spectrometer, nitrogen adsorption isotherms, scanning electron microscopy, transmission electron microscopy, and UV-visible absorption spectra. The average length and the cross section diameter of the as-prepared samples were <I>ca</I>. 1.5 μm and ca. 80 nm, respectively. The photocatalytic activity was evaluated by photodegradation of methylene blue (MB) in aqueous solution. The N-doped mesoporous TiO<SUB>2</SUB> nanorods showed an excellent photocatalytic activity, which may be attributed to the enlarged surface area (106.4 m<SUP>2</SUP> g<SUP>-1</SUP>) and the narrowed band gap (2.05 eV). Besides, the rod-like photocatalyst was found to be easy to recycle.</P>
Liang Li,Xiufeng Wang,Liping Yang,Yajun Fan,Xiaojuan Zhu,Xingzhi Wang 한국식물생명공학회 2016 Plant biotechnology reports Vol.10 No.4
Transient expression of foreign genes by Agrobacterium infiltration is a versatile technique that can be used as a rapid tool for functional protein production in plants. A reproducible protocol of large-scale production of foreign proteins via the novel plant transient expression system in Pisum sativum L. was established in our study. Non-detached plants from soil-independent culture were used as the target organ, and vacuum infiltrating mediated by Agrobacterium tumefaciens harboring green fluorescent protein (GFP) gene was performed. Step-by-step optimization was performed and showed that the quality of plant material as well as agro-infiltration conditions were the major factors influencing the gene expression. Monitoring the transient GFP expression daily, the highest expression level was achieved on the 8th day post-infiltration. Evidence of anti-acidic fibroblast growth factorsingle chain variable fragment (anti-aFGF-scFv) gene expression in pea seedling was also achieved using agromediated vacuum infiltration system. Our work proves that the system is suitable for the largescale production of pharmaceutical proteins. The in planta infiltration system described here provides a powerful tool to explore easily gene expression in Pisum sativum L. avoiding tissue culture steps and the labor-intensive generation of transgenic plants.
Response of Ammonia Assimilation in Cucumber Seedlings to Nitrate Stress
Xiaoyu Yang,Xiufeng Wang,Min Wei,Shoko Hikosaka,Eiji Goto 한국식물학회 2010 Journal of Plant Biology Vol.53 No.3
The influence of increased nitrate concentration—14 (control) and 140 mmol L−1 (T)—in hydroponic culture on ammonia assimilation in cucumber (Cucumis sativus L. cv. Xintaimici) seedlings was investigated. The results showed that NH3 accumulation in the roots and leaves of T seedlings increased significantly, indicating that NH3toxicity might be involved in nitrate stress. Under control conditions, GS and GOGAT activity were much higher in the leaves than in the roots, whereas GDH activity was much higher in the roots than in the leaves. Correlation analysis showed that NH3 concentration had a strong negative linear relationship with GDH activity in the roots but had a strong negative linear relationship with GS and GOGAT activity in the leaves. These results indicate that NH3 might be assimilated primarily via GDH reaction in the roots and via GS/GOGAT cycle in the leaves. Shortterm nitrate stress resulted in the increase of GS and GOGAT activity in the roots and GDH activity in the leaves of T seedlings, indicating possible shifts in ammonia assimilation from the normal GDH pathway to GS/GOGAT pathway in the roots and from the normal GS/GOGAT pathway to the GDH pathway in the leaves under nitrate stress, but with the increase of treatment time, GS, GOGAT,and GDH activity in the roots and leaves of T seedlings decreased possibly due to low water potential and NH3toxicity.
Lingqin Shen,Hengbo Yin,Aili Wang,Xiufeng Lu,Changhua Zhang,Fen Chen,Yuting Wang,Huijuan Chen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Liquid phase dehydration of glycerol to acrolein catalyzed by Brønsted acidic ionic liquids (BAILs) usingsemi-batch reaction technique was investigated. For the BAILs catalysts, the acrolein yields were inan order of [Bmim]H2PO4 > [Bmim]HSO4 > [BPy]HSO4 > [PSPy]HSO4 > [N2224]HSO4 > [PSPy]H2PO4> [BPy]H2PO4 > [N2224]H2PO4. When [Bmim]H2PO4 and [Bmim]HSO4 were used as the catalysts at 270℃ with the molar ratio of catalyst to glycerol of 1:100, the acrolein yields were 57.4% and 50.8%,respectively, at complete conversion of glycerol. The BAILs with [Bmim] cation and moderate acidityfavored the formation of acrolein in liquid phase glycerol dehydration.
Threshold magnetoresistance in anistropic magnetic 2D transition metal dichalcogenides
Xu, Hongjun,Hsu, Ming-Chien,Fuh, Huei-Ru,Feng, Jiafeng,Han, Xiufeng,Zhao, Yanfeng,Zhang, Duan,Wang, Xinming,Liu, Fang,Liu, Huajun,Cho, Jiung,Choi, Miri,Chun, Byong Sun,Ó,Coileá,in, Cormac The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.12
<P>Recently many novel magnetoresistance (MR) phenomena have been reported from studies of two dimensional (2D) materials. Here, we report on the exotic transport behavior of VS2. A large negative and quadratic MR of −10% is observed for an in-plane magnetic field B up to 14 T. Remarkably, when the applied field deviates from the in-plane orientation there is a threshold field, Bc, and the MR shows a plateau of near zero MR. When B < Bc, only a single state exists and the transition between quantum spin states is forbidden. Our work sheds new light on the MR of magnetic 2D materials with localized states and may spur further investigations.</P>