JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Chunying Zhu,Xiaofen Ren,Youguang Ma
Densities (ρ) and viscosities (η) of aqueous xylitol solutions with glycine, l-alanine, l-valine, l-threonine, or l-arginine were measured at T = (293.15 to 323.15) K under atmospheric pressure. The density values were utilized to further calculate the apparent molar volume (Vφ), the limiting partial molar volumes of amino acids (Vφ0), the limiting partial molar volumes of transfer (ΔtrVφ0) and the interaction coefficients Vab, Vabb, Vabbb. The viscosity data were used to obtain viscosity B-coefficient, the free energies of activation per mole of solvent (Δμ10≠) and solute (Δμ20≠). The limiting partial molar volumes of transfer and the free energies of activation per mole of both solvent (Δμ10≠) and solute (Δμ20≠) were analyzed based on the cosphere overlap model and transition state theory, respectively. The hydration number of amino acid was determined using the obtained limiting partial molar volume and viscosity B-coefficient.
研究领域:
生物化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Yugang Shu,Jiaguang Zheng,Chengguo Yan,Ao Xia,Meiling Lv,Zhenxuan Ma,Zhendong Yao
NaBH 4 was widely regarded as a low-cost hydrogen storage material due to its high-mass hydrogen capacity of approximately 10.8% (mass) and high volumetric hydrogen capacity of around 115 g·L –1 . However, it exhibits strong stability and requires temperatures above 500 °C for hydrogen release in practical applications. In this study, two polyhydric alcohols, xylitol and erythritol (XE), were prepared as a binary eutectic sugar alcohol through a grinding-melting method. This binary eutectic sugar alcohol was used as a proton-hydrogen carrier to destabilize NaBH 4 . The 19NaBH 4 -16XE composite material prepared by ball milling could start releasing hydrogen at 57.5 °C, and the total hydrogen release can reach over 88.8% (4.45% (mass)) of the theoretical capacity. When the 19NaBH 4 -16XE composite was pressed into solid blocks, the volumetric hydrogen capacity of the block-shaped composite could reach 67.2 g·L –1 . By controlling the temperature, the hydrogen desorption capacity of the NaBH 4 -XE composite material was controllable, which has great potential for achieving solid-state hydrogen production from NaBH 4 .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Yeke Chenxu,Xuefeng Shao,Binrui Wang,Nan Zhang,Yanping Yuan
Towards long-term seasonal latent heat storage, the PCMs with strong supercooling are recommended as the heat storage medium. Nevertheless, the suitable techniques activating latent heat release is also of significance in the period of heat supply. The present work investigated the N 2 bubbling triggered crystallization of supercooled xylitol. Special attention was paid to the subcooling effect. The N 2 bubbling was identified to be a potential technique to trigger crystallization of xylitol at moderate degrees of subcooling. It was found that efficient crystallization issues were obtained with degrees of subcooling from 40 °C to 60 °C, while uncrystallization was obtained with both lower and higher subcooling. The recorded temperature history curves show that subcooling effect has strong influence on the crystallization behavior. The crystallization points tend to decline from 51.9 °C to 42.3 °C with degree of subcooling rising from 40 °C to 50 °C. The crystallization durations extend with subcooling effect enhancing. Fortunately, bubbling technique has slight influence on the properties of formed xylitol crystals. Moreover, the subcooling significantly influences the transportation behavior of bubbles. Particularly, The specific growth rates of bubbles are determined to be as low as 0.005 mm/min with the lowest degree of subcooling 10 °C, and continue to rise over 20 times when the subcooling reaches to 60 °C. The interfaces of bubbles as potential nucleation sites were deemed to be one of the important issues to activate heterogeneous nucleation, thus trigger crystallization. The present investigation is helpful to understand the fundamentals of bubbling effect on crystallization with broad range of subcooling.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 5
·1-7
·
IF 1.92
Teng Lijing,Xu Xiaohong,Nie Wangyan,Zhou Yifeng,Song Linyong,Chen Pengpeng
Star-shaped polylactide (PLLA) is a potential candidate in many biomedical applications owing to its short degradation time; however, non-bioresorbable polyols have been used in most syntheses of star-shaped polylactide and these are a potential hazard. In this work, reaction of natural xylitol with l -lactide (LLA) was used to synthesize a star-shaped polyester via ring-opening polymerization. The chemical structures of the prepared star-shaped PLLA were characterized by means of 1 H NMR and gel permeation chromatography (GPC). The crystallization behaviors of the polymers were examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The XRD curves of all the star-shaped PLLA based on various xylitol molar fractions were similar, but the crystallinity decreased with the increase of the xylitol molar fraction. These polymers were amorphous when the molar fraction of xylitol was higher than 6 %, whereas they were semicrystalline when the molar ratio of xylitol fell below 6 %. Finally, the degradation of the star-shaped PLLA was studied in phosphate buffer solution (pH 7.4) at 37 °C, which indicated that the degradation rate of polymers increased with the increase of xylitol molar fraction.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2014
·
IF 3.019
Dong-Can Lv,Yun-Quan Liu,Shui-Rong Li,Yue-Yuan Ye,Duo Wang
In this work, direct production of heavier hydrocarbons from biomass-derived xylitol by reduction with hydroiodic acid (HI) in the presence of phosphorous acid (H 3 PO 3 ) was studied. The effects of the feed ratio of raw materials, mixing intensity, and reaction time on catalytic performance were investigated by experiments. It was found that the molar ratio of xylitol/HI and H 2 O/HI had significant effects on the conversion of xylitol and yield of hydrocarbons. A maximum yield of 80.3% for hydrocarbons was achieved at a xylitol/HI/H 3 PO 3 /H 2 O molar ratio of 0.4:1:2:12, a mixing intensity of 800 rpm, and a reaction time of 12 h. High performance liquid chromatography (HPLC) and gas chromatograph/mass spectrometer (GC/MS) were used to determine the amount of xylitol and to analyze the composition of hydrocarbon products, respectively. The hydrocarbons obtained are mainly C 10 and C 15 hydrocarbons with aromatic rings , which have a high heating value of 43 kJ/g, making them suitable for diesel or/and jet fuel substitutes.
研究领域:
生物化学
·
可再生能源
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 29
·期 3
·917-930
·
IF 2.961
Zhong Weixu,Hong Jiabin,Wang Chunxiang,Li Zhifeng,Chen Jun,Dmytro Sydorov
Nano-MoS 2 and MoS 2 /graphene nanocomposites are prepared by a simple xylitol auxiliary ball milling method. Xylitol can increase the shear force in the ball milling process and overcome the interlayer van der Waals force between MoS 2 and the graphite layer, thus improving the efficiency of preparing nanomaterials by ball milling method. As a result, the MoS 2 /graphene hybrid nanosheets exhibit higher discharge capacity and better cycle stability as lithium-ion anode materials. When the original addition amount of MoS 2 and graphite is 1:1, the materials have the best electrochemical behaviors. The initial discharge capacity is as high as 1014 mAh·g −1 at a current density of 50 mA·g −1 , after 300 cycles at a current density of 250 mA·g −1 , the capacity remains at 664 mAh·g −1 without decay. Therefore, the xylitol auxiliary ball milling method is suitable for the scalable preparation of new transition metal sulfide (TMDS)-based anodes for lithium-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xuewu Zhu,Zhongyue Sun,Fengxun Tan,Jianjun Zhu,Feiyong Chen,Sisi Xu,Daoji Wu,Daliang Xu,Heng Liang,Xiaoxiang Cheng
Polyester (PE) membranes with outstanding permeance and efficient dye desalination performance have become ideal for resource recovery from dye wastewater. However, further improving the performance of PE membranes remains challenging. Herein, a novel high-performance PE loose nanofiltration (LNF) membrane was fabricated via interfacial polymerization, in which nontoxic, rich in hydroxyl, large size, inexpensive, low reactivity, and biodegradable xylitol (XL) was utilized to fabricate PE films. The newly formed XL-based membrane had a hydrophilic, negatively charged, smooth, loose, and thin selective layer. The membrane was optimized by controlling the XL concentrations in the aqueous phase (0.5–2.5 wt%). The optimized membrane (XL-1.5/TMC) exhibited unprecedented water permeance (97.6 L m −2 h −1 bar −1 ) and satisfactory dye desalination performance (Congo red/Na 2 SO 4 selectivity of 259). In addition, the XL-1.5/TMC membrane showed outstanding antifouling performance and stability, which showed great potential for the large-scale application of XL-based membranes. Therefore, this new strategy for the fabrication of PE LNF membranes featuring superior performance using XL was proposed to facilitate resource recovery from dye wastewater.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Honghua Jia,Tingting Shao,Chao Zhong,Hengxiang Li,Min Jiang,Hua Zhou,Ping Wei
In this paper, we produced hemicellulosic hydrolysate from corncob by tetrabutylammonium hydroxide (TBAH) extraction and dilute acid hydrolysis combined, further evaluating the feasibility of the resultant corncob hemicellulosic hydrolysate used in xylitol production by Candida tropicalis . Optimized conditions for corncob hemicellulose extraction by TBAH was obtained via response surface methodology: time of 90 min, temperature of 60 °C, liquid/solid ratio of 12 (v/w), and TBAH concentration of 55%, resulting in a hemicellulose extraction of 80.07% under these conditions. The FT-IR spectrum of the extracted corncob hemicellulose is consistent with that of birchwood hemicellulose and exhibits specific absorbance of hemicelluloses at 1380, 1168, 1050, and 900 cm −1 . In addition, we found that C. tropicalis can ferment the resulting corncob hemicellulosic hydrolysate with pH adjustment and activated charcoal treatment leading to a high xylitol yield and productivity of 0.77 g/g and 2.45 g/(L h), respectively.
研究领域:
生物化学
·
发酵工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Baoyou Liu,Jie Tian
The efficient and environmentally friendly recovery and separation of ammonia (NH3), as a toxic substance in the environment and an indispensable chemical raw material, has always been a challenge. In the present work, natural deep eutectic solvents (DESs) based on dual solid components of glycolic acid (GA) and xylitol (XYL) were designed and synthesized as absorbents to capture ammonia efficiently and reversibly. The results showed that DESs exhibited ideal physical properties, high NH3 absorption capacity, and high NH3/CO2 selectivity. At 303.15 K and 101.33 kPa, the absorption capacity of GA+XYL (3:1) for NH3 is as high as 0.225 g NH3·(g DES)−1, which is much higher than those of ionic liquids and DESs reported so far. DES absorbs NH3 with high reversibility and can represent high absorption performance after five absorption–desorption cycles. In addition, the intrinsic absorption mechanism was analyzed using spectral characterization and quantum chemical calculation. These protic DES-based GA and XYL with high efficiency and reversible NH3 capture are expected to be promising substitutes for ammonia absorbents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Ali Mohsin,Kanagat Akbota Akyliyaevna,Waqas Qamar Zaman,Muhammad Hammad Hussain,Muhammad Zubair Mohsin,Sarah Al-Rashed,Xin Tan,Xiwei Tian,Kistaubayeva Aida,Muhammad Tariq,Muhammad Salman Haider,Imran Mahmood Khan,Sobia Niazi,Yingping Zhuang,Meijin Guo
The present study emphasizes improving the overall yield, productivity and quality of xanthan by Xanthomonas campestris using different carbon sources via optimizing the fermentation media and kinetic modelling work. After optimization, six carbon sources and one nitrogen source were selected for xanthan production in 5 L bioreactor. Kinetic modelling was applied to assess the experimental fermentation data and to check its influence on scale-up production. In this work, xanthan production reached 40.65 g/L with a growth-associated rate constant (α) of 2.831, and highest specific growth rate (μm) of 0.37/h while using maltose as the sole carbon source. Furthermore, rheological properties were determined, and Herschel-Bulkley model was employed to assess the experimental data. Interestingly, xanthan obtained from sucrose and glucose showed the highest yield stress (τ 0 ) of 12.50 ± 0.31 and 7.17 ± 0.21. Moreover, the highest xanthan molecular weight of 3.53 × 10 7 and 3.25 × 10 7 g/mol were also found with sucrose and glucose. At last, the proposed mechanism of sugar metabolism and xanthan biosynthesis pathway were described. Conclusively, maltose appeared as the best carbon source for maximum xanthan production: while sucrose and glucose gave qualitatively best results. In short, this systematically modelled approach maximizes the potential output and provides a solid base for continuous cultivation of xanthan at large-scale production.
研究领域:
微生物学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Suozhu Wu,Hongyuan Guo,Li Wang,Yunlei Xin,Yuansheng Cheng,Weixing Fan
An ultrasensitive electrochemical biosensing platform was developed for fructose and xylitol based on boronic acid-diol recognition. The sensing element of the platform was constucted by poly(3-aminophenylboronic acid)-reduced graphene oxide (PAPBA-RGO) modified electrode. The combination of RGO with PAPBA could remarkably enhance electrical conductivity of PAPBA film and significantly improve sensitivity of PAPBA to analyte. When the electrode was immersed in solution with fructose or xylitol, complexation of boronic acid groups of PAPBA with fructose or xylitol would occur at the proposed electrode and simultaneously cause sterical effect, resulting in hindering redox probe like ferricyanide to access the proposed electrode. Electrochemical determination of fructose or xylitol was performed by detecting the peak current change of ferricyanide. Our results showed with the increasing concentration of fructose or xylitol, peak current of ferricyanide continously decreased. The response range for both fructose and xylitol was 1 × 10 −12 –1 × 10 −2 M with a limit of detection of 1 × 10 −12 M for fructose and 6 × 10 −13 M for xylitol, respectively. Furthermore, the proposed electrode was employed for gum sample analysis.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2019
·
IF 0
Cai-Juan Liu,Ning-Ning Zhu,Jian-Gong Ma,Peng Cheng
Xylitol is one of the most famous chemicals known to people as the essential ingredient of chewing gum and as the sugar alternative for diabetics. Catalytic hydrogenation of biomass-derived xylose with H2 to produce high-value xylitol has been carried out under harsh reaction conditions. Herein, we exhibit the combination of Ru NPs with an environmentally benign MOF (ZIF-67) to afford a heterogeneous composite catalyst. Complete conversion of xylose with 100% selectivity to xylitol was achieved at 50°C and 1 atm H2. This is the first successful attempt to produce xylitol with ambient pressure H2 as well as the first time to achieve a 100% selectivity of xylitol for applicable catalysts. We also proved the universality of the Ru@ZIF-67 towards other hydrogenation processes. Under 1 atm H2, we achieved 100% conversion and >99% selectivity of 1-phenylethanol at 50°C for the hydrogenation of acetophenone. This is also the first report of hydrogenating acetophenone to 1-phenylethanol under 1 atm H2, which confirms that our result not only contributes to enhance the industrial yields of xylitol and reduces both the economical and energy costs but also provides new perspectives on the other hydrogenation process with H2.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）