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- 저자 : Chengxiang He (검색결과 3 건)
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Bolormaa Gendensuren,Chengxiang He,오은석 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
The modification of pectin polysaccharide through grafting with polyacrylamide and crosslinking is newly proposed as a powerful candidate for a water-soluble binder of high-capacity Si anodes in lithium ion batteries. The grafting of pectin with polyacrylamide enhances adhesion in the electrode and contributes to the good wettability of the carbonate electrolyte. Herein, dual-crosslinking of pectin-g-polyacrylamide was achieved by the ionic crosslinking of pectin with divalent calcium ions and the chemical crosslinking of polyacrylamide with a bisacrylamide. As a result, the dual-crosslinked binder improves further the cycling performance of the Si/C composite anode with a 1.2mg cm2 loading, which retains a specific capacity of 729 mAh g1 after 300 cycles. In contrast, the Si/C electrode containing dual-crosslinked alginate with polyacrylamide shows a specific capacity of 515mAh g1 after 300 cycles.
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Mechanism of Ce promoting SO2 resistance of MnOx/γ-Al2O3: An experimental and DFT study
Xiaopeng Zhang,Zhuofeng Li,Jijun Zhao,Yuezong Cui,Bojian Tan,Jinxin Wang,Chengxiang Zhang,Gaohong He 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.7
Various physico-chemical techniques and theoretical chemistry computations are used to obtain a deep insight into the mechanism of Ce improving SO2 resistance of the catalyst Mn0.4Cex/Al2O3 (x stands for the molar ratio of Ce : Al). Theoretical computation with density functional theory (DFT) shows that Ce modification enhances the adsorption energy of SO2 adsorbed on Ce surrounding, resulting in the preferential adsorption of SO2 on Ce surrounding. It protects the surface Mn from SO2 poisoning, leading to a better SO2 resistance. FT-IR and TG results are in good accordance with DFT results. FT-IR results suggest that absorption peaks related to SO4 2− cannot be detected in Mn0.4Ce0.12/Al2O3. Moreover, TG results show that weight loss peaks due to sulfated MnOx decomposition disappears after Ce addition. Therefore, Ce modification inhibits sulfates formation on active components lead to a better resistance to SO2 of Mn0.4Ce0.12/Al2O3.
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Sphingobacterium wenxiniae sp. nov., a cypermethrin-degrading species from activated sludge
Zhang, Jun,Zheng, Jin-Wei,Cho, Byung Cheol,Hwang, Chung Yeon,Fang, Chengxiang,He, Jian,Li, Shun-Peng Microbiology Society 2012 International journal of systematic and evolutiona Vol.62 No.3
<P>A Gram-negative, non-motile, non-spore-forming, non-flagellated rod capable of degrading cypermethrin, designated LQY-18<SUP>T</SUP>, was isolated from activated sludge of a wastewater treatment plant in China. Strain LQY-18<SUP>T</SUP> grew at 8-40 °C (optimum 30 °C), at pH 5.0-10.0 (optimum pH 7.0) and with 0-5 % (w/v) NaCl (optimum 1 %). The predominant menaquinone was MK-7 (97 %) and the major fatty acids were summed feature 3 (comprising C16 : 1ω6<I>c</I> and/or C16 : 1ω7<I>c</I>), iso-C15 : 0 and iso-C17 : 0 3-OH. The DNA G+C content was 40.3 mol%. Phylogenetic analysis revealed that the isolate belonged to the genus <I>Sphingobacterium</I> of the phylum <I>Bacteroidetes</I> and showed low 16S rRNA gene sequence similarity with recognized members of the genus <I>Sphingobacterium</I>. The closest neighbour was <I>Sphingobacterium mizutaii</I> ATCC 33299<SUP>T</SUP> (92.9 % 16S rRNA gene sequence similarity). On the basis of phenotypic, genetic and phylogenetic data, strain LQY-18<SUP>T</SUP> ( = ACCC 05410<SUP>T</SUP> = CCTCC AB 2010005<SUP>T</SUP> = KCTC 23009<SUP>T</SUP>) should be classified as a representative of a novel species of the genus <I>Sphingobacterium</I>, for which the name <I>Sphingobacterium wenxiniae</I> sp. nov. is proposed.</P>
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