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- 저자 : Longfang Ren (검색결과 4 건)
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Longfang Ren,Xiangdong Ma,Shaoting Wang,Taotao Qiang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
In this work, surface modification is employed to improve the functionality of bundle-type polyamidefiber nonwoven (PAFN) by a simple method. Firstly, PAFN was treated with formaldehyde to gethydroxylated PAFN (PAFN-OH) with N-hydroxymethyl structure, and then PAFN-OH was modified byusing (3-aminopropyl) trimethoxysilane (APS) to prepare silanized PAFN (PAFN-NH2). Secondly, ester-functionalized PAFN (PAFN-COO) was prepared by Michael 1,4 conjugate addition of PAFN-NH2 anddipentaerythritol pentaacrylate (5Acl). Finally, PAFN-COO was modified with collagen to evaluate thehydrophilicity of the functionalized PAFN (PAFN-g). The scanning electron microscopy (SEM) and X-rayphotoelectron spectroscopy (XPS) spectra provided evidence for the modification from PAFN to PAFN-g. Moreover, the atomic force microscopy (AFM) shows the change in surface roughness of PAFN andmodified PAFN. The water vapor transmission rate was increased 137.4% and the water contact anglesdecreased from 124.2 to 68.3 by comparing PAFN with PAFN-g. This indicated that the hydrophilicity ofPAFN modified by collagen was improved significantly.
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Zhang, Wen,Wang, Xuechuan,Qi, Xiangjun,Ren, Longfang,Qiang, Taotao 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.3
A bacterial cellulose (BC) synthesizing strain (Gluconacetobacter xylinus ZHCJ618) was isolated from kombucha and selected as the species for commercial applications owing to its high phenotypic stability and sustainable production capacity of $7.56{\pm}0.57g/L$ under static culturing conditions and $8.31{\pm}0.79g/L$ under shaking conditions. The morphological, physiological and biochemical characteristics of the strain were similar to those of Gluconacetobacter genus. The 16S rDNA sequence homologies with G. xylinus NCIB 11664 reached 99%, showing that the isolated strain can be identified as G. xylinus. The material properties of BC were studied by fourier transform infrared spectroscopy, scanning electronic microscopy, X-ray diffraction, thermogravimetric analysis, and tensile test. The results showed that BC synthesized under static conditions exhibited stronger tear strength, higher crystallinity, superior waterhold and rehydration rate than BC synthesized under shaking conditions.
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Taotao Qiang,Shaoting Wang,Zhihong Wang,Longfang Ren 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
To solve the problem that it is difficult to recycle the ZIF-67 in aqueous solution, a porous self-supportingmaterial (KGM/GO) was prepared by using biomass KGM. And then ZIF-67 crystal was loaded onto KGM/GO solid substrate by in-situ growth method so that a novel KGM/GO/ZIF-67 composite aerogel wasobtained. FT-IR and SEM characterization showed that ZIF-67 was successfully loaded on KGM/GO substrateby covalent bonding, and the adsorption site of composite aerogel surface was uniform. The N2adsorption/desorption testing results showed that the porosity of composite aerogel changed from86.48 % to 91.18 % after loading ZIF-67. It provides enough diffusion channel and active adsorption sites. Moreover, the as-prepared composite aerogel showed excellent adsorption ability to both methyleneblue and methyl orange, and the maximum adsorption capacities were as high as 185.67 mg/g(pH = 8) and 130.2 mg/g (pH = 2), respectively. Noted that after five cycles, the adsorption capacity tomethylene blue and methyl orange were still up to 174.4 mg/g and 118.3 mg/g, which exhibited highadsorption capacity and excellent reusability. Therefore, loading ZIF-67 on KGM/GO substrate canenhance the adsorption and recovery performance of ZIF-67. The method provides a new possibilityfor the treatment of complex dye-containing wastewater.
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Wen Zhang,Xuechuan Wang,Xiangjun Qi,Longfang Ren,Taotao Qiang 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.3
A bacterial cellulose (BC) synthesizing strain (Gluconacetobacter xylinus ZHCJ618) was isolated from kombucha and selected as the species for commercial applications owing to its high phenotypic stability and sustainable production capacity of 7.56 ± 0.57 g/L under static culturing conditions and 8.31 ± 0.79 g/L under shaking conditions. The morphological, physiological and biochemical characteristics of the strain were similar to those of Gluconacetobacter genus. The 16S rDNA sequence homologies with G. xylinus NCIB 11664 reached 99%, showing that the isolated strain can be identified as G. xylinus. The material properties of BC were studied by fourier transform infrared spectroscopy, scanning electronic microscopy, X-ray diffraction, thermogravimetric analysis, and tensile test. The results showed that BC synthesized under static conditions exhibited stronger tear strength, higher crystallinity, superior waterhold and rehydration rate than BC synthesized under shaking conditions.
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