SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Shuai Ji,Yujie Wang,Xian Shao,Cuicui Zhu,Yan Lin,Shikai Gao,Daoquan Tang
Triterpenoid saponins in licorice are important lead compounds for nutraceutical and pharmaceutical applications. This study developed a novel method for extraction and purification of triterpenoid saponins from licorice by ionic liquid based ultrasonic-assisted extraction combined with in situ alkaline aqueous biphasic systems (IL-UAE-AABS). IL-UAE was firstly used to efficiently extract triterpenoid saponins from licorice, which were further purified using in situ IL-AABS formed by adding NaOH into the extraction solution. We screened out the best-performing IL, namely 1-butyl-3-methylimidazolium tetrafluoroborate ([C 4 MIM]BF 4 ), from various ILs able to form AABS with NaOH, and established the optimal conditions (extraction time, [C 4 MIM]BF 4 concentration and solvent to solid ratio for IL-UAE, and NaOH concentration and temperature for IL-AABS). The established method could achieve high extraction efficiency (26.0 mg/g for glycyrrhizin) and total purify (more than 81.5%) for triterpenoid saponins, which was far superior to conventional IL-ABS. In addition, [C 4 MIM]BF 4 could be easily recovered and reused for the IL-UAE-AABS process for at least three times without apparent worse performance. This is the first report on extraction and purification of natural products by IL-UAE-AABS, which was shown to be able to efficiently and selectively obtain triterpenoid saponins from herbal medicines with good prospects.
研究领域:
中药化学
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天然产物提取
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制药工程
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产品关联
DOI
高影响因子
Journal of Applied Spectroscopy
·
2014
·Vol. 81
·期 5
·807-811
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IF 0.514
Liu Y.,Fan J.,Ma W.,Fu Ch.
An aqueous two-phase system of acetone and (NH 4 ) 2 SO 4 mixture has been developed for the extractive separation of copper (Cu). The complex formed by Cu(II) and Nuclear Fast Red was found to be extracted into the acetone-rich upper phase, and the absorbance of the complex was determined at 465 nm. Beer’s law was obeyed over the concentration range of ~0.6–3.2 mg/l for Cu(II) with a good linearity. The proposed method has been applied to the separation and determination of Cu(II) in seafood samples with a coefficient of variation less than 2.8%. The recovery obtained was ~96.3–101.7%.
研究领域:
分析化学
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环境化学
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食品安全检测
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2025
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IF 4.8
Xiao Du,Tengfei Li,Lumei Wang,Dezhang Ren,Wenhui He,Zhibao Huo
In this paper, an alkali-free route for the conversion of chitin and shrimp shell to acetic acid (AA) using aluminum salts in aqueous media was reported for the first time. The proposed method demonstrated several advantages, including simplicity, effectiveness, and superior environmental and economic benefits compared to previous approaches. Notably, it achieved a significant breakthrough in the yields of AA derived from chitin and shrimp shells. Under the optimal conditions, the yield of AA reached the maximum value of 81.4 %. Combined with theoretical calculation and characterization, a possible transformation mechanism was proposed, and it was proved that the presence of aluminum salts would change the main reaction pathway and participate in the preparation of AA in the form of polymers. This study provided a novel idea for the resource utilization of chitin and waste shell materials into valuable chemicals and also for the treatment of environmental pollution.
研究领域:
生物化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Zhenyu Zhang,Juan Liu,Ting Li,Zhikai Fu,Jinshui Mao,Xiaocheng Li,Sili Ren
Recycling of Nd(III) and Dy(III) from waste NdFeB magnets is increasingly critical in the sustainable development of rare-earth elements (REEs) industry. The efficient separation of Nd(III) and Dy(III) from conventional aqueous solution by solvent extraction (SX) is facing huge challenge due to the high activity, high interfacial tension and the high dielectric constants of water that affect the coordination of REEs with the extractant. Herein, a novel non-aqueous solvent extraction (NASX) system based on neutral extractant P350 was developed to extract Nd(III) and Dy(III) with high extraction efficiency and separation factor. In this extraction system, the majority of water in the aqueous phase was replaced by different low-dielectric-constant polar molecular organic solvents (PMOSs) to reduce the influence of water during extraction. The effect of the type and content of PMOSs, P350 concentration, extract equilibration time and temperature on the separation performance were systematically investigated. It was encouraging to find that the favorable separation factor of Nd(III) and Dy(III) elements ( β Nd/Dy ) was determined to be 201 when extracted from 70 vol% PEG 200 with 0.2 mol/L P350, which was higher than that in traditional extraction from aqueous phase. Slope analysis method was used to determine the extractant stoichiometry and the main species of extraction complex was identified as DyCl 3 ·2L which was verified by Fourier infrared spectroscopy (FT-IR). Furthermore, in the simulation of recovery of NdFeB magnetic immersion solution experiment, the extraction efficiency (E%) of Dy(III) can reach 85 %, while co-extraction of Nd(III) was only 6 % and the β Dy/Nd was as high as 83.4. According to the McCabe-Thiele diagram, 3-stages counter-current solvent extraction was needed to completely extract Dy(III). Moreover, 97.11 % of Nd(III) and 98.5 % of Dy(III) in the loaded organic phase can be sequentially stripped by 0.04 mol/L and 0.4 mol/L HCl, respectively. These results indicated that the developed processes in this work have superior extraction efficiency, large separation factors and excellent stripping stability. Eventually, a P350-PEG 200 extraction system-based separation process was proposed in the hope of providing a novel and low-cost alternative to the efficient recycle of Nd(III) and Dy(III) from end-of-life NdFeB.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
ENERGY & FUELS
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2025
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IF 5.3
Kaixin Jin,Xiao Lu,Zhouwen Li,Guangmai Zhao,Wanpeng Li,Xuewei Zhang,Haiyong Wang,Junzhang Wu,Xiaobin Xie,Li Zhao,Tianhan Zhu,Yuhe Liao,Chenguang Wang,Dalei Zhang
Cellulosic ethanol is a pivotal biofuel, and its chemocatalytic production from lignocellulosic biomass is crucial for addressing global energy challenges. In this study, a series of Pt-loaded catalysts were developed by sequentially loading varying weight percentages (wt %) of Pt and W onto SiO2 carriers using the impregnation method. The catalysts were comprehensively characterized through X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy to analyze the metal dispersion and active oxidation states on the SiO2 support. Under hydrothermal conditions (240 °C and 4 MPa H2), cellulose was directly converted to ethanol in the aqueous phase, achieving an ethanol yield of 37.5 C%. The catalysts demonstrated excellent stability, maintaining high activity over at least five consecutive reaction cycles. Notably, the WO3 component played a key role in facilitating C–C bond cleavage and hydrolyzing cellulose into glucose and ethanal intermediates. These intermediates were swiftly transferred to the Pt active sites, further promoting the formation of ethylene glycol. Among the catalysts, 3%Pt-15%WO3/SiO2 exhibited optimal performance due to its well-balanced ratios of Pt0 and Pt2+, which enabled selective C–O bond activation and significantly enhanced ethanol production.
研究领域:
生物化学
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催化化学
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可再生能源
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2017
·Vol. 19
·期 5
·1308-1314
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IF 9.125
Zhibao Huo,Jiefeng Xiao,Dezhang Ren,Fangming Jin,Tian Wang,Guodong Yao
A new non-fermentative process for the transformation of biomass carbohydrates and lactic acid (LA) into propionic acid (PA) was first reported over a cobalt catalyst in water. The Co catalyst exhibited high catalytic activity for the formation of PA with Zn as a reductant. Various parameters, such as catalyst loading, Zn weight, water volume, temperature and reaction time, were investigated to improve the yield of PA, and the maximum value of 58.8% was achieved in the presence of 4 mmol Co and 10 mmol Zn in 7.5 mL H2O at 250 °C for 2 h. The recyclability of the Co catalyst showed that Co could be effectively repeated four times without the loss of activity. Moreover, the result showed that in situ-formed ZnO by oxidation of Zn in water could efficiently enhance the catalytic activity of the Co catalyst in the conversion of LA. Besides, direct conversion of carbohydrate biomass, such as glucose, cellulose and starch, or a similar compound such as glycolic acid also afforded the desired products. The present study provides great significance for practical application on the production of PA from LA and biomass carbohydrates.
研究领域:
化学工程
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可再生能源
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催化化学
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DOI
高影响因子
FUEL
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2024
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IF 6.7
Fengli Yang,Qing Xia,Guangpin Lin,Yi Su,Wei Lin,Huabing Zhang,Guobin Liang
Saccharide is the main product of biomass hydrolysis, which can be converted into high-value-added chemicals and fuels, and the isomerization of glucose to fructose is a decisive step in biomass conversion technology. In this research, the isomerization reaction of glucose catalyzed by MgCl 2 -700 in water has been studied, and the fructose yield and selectivity reached 36.4 % and 79.3 %, respectively in an aqueous system at 120 °C for 60 min. The results of electrospray ionization tandem mass spectrometry (ESI-MS) and density functional theory (DFT) show that [MgCl(aq)] + formed in an aqueous system coordinated with glucose for isomerization reaction, and the binding of C1/C2 sites of the β-glucopyranose and [MgCl(aq)] + promoted the 1,2-intramolecular hydride shift of glucose, thus rapidly converting glucose into fructose.
研究领域:
生物化学
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催化化学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2020
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IF 7.539
Haiwei Jiang,Liangliang Fan,Chang Cai,Ying Hu,Fenghua Zhao,Roger Ruan,Weiran Yang
The hydrothermal liquefaction (HTL) of As enriched Pteris vittata L. (PVL, hyper-accumulator biomass) was performed with the recycled aqueous phase as reaction medium, aiming to dispose the biomass with high water content and produce high-quality bio-oil. After three times of aqueous phase recycling at 275 °C, 30 min, the bio-oil yield increased to 30.32% from 21.54% and the higher heating value (HHV, 28.51 MJ/kg) of the bio-oil was higher than that of the bio-oil from HTL with pure water (26.80 MJ/kg). The main compounds detected in bio-oils were phenols, ketones, hydrocarbons, and aldehydes. Acetic acid (17.21–24.77 mg/mL) was dominant in the aqueous phases, resulting in the low pH (4.31–4.89). The heavy metals (Cu, Pb, Zn, Cd) mainly remained in bio-char whereas As was transferred to aqueous phase. Thus, HTL by aqueous phase recycling could be a promising way for PVL treatment to obtain high-quality bio-oil and arsenic recovery.
研究领域:
环境科学
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能源植物学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 12
·9224-9232
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IF 2.828
Qin Li,Feng Mingbao,Zhang Xuesheng,Wang Liansheng,Wang Zunyao
Polychlorinated diphenyl ethers (PCDEs) are a group of halogenated aromatic compounds and serious environmental pollutants. In the present study, sediment and water samples from eight sites in Nanjing section of the Yangtze River were characterized with 15 congeners of PCDEs. Concentrations and distributions of these PCDEs in water phase and sediments were analyzed by GC/MS. Results demonstrated that ∑PCDE concentrations were higher in the low water period (1.15–1.80 μg/L) than those in the high water period (0.73–1.30 μg/L) in water phase. Moreover, ∑PCDE concentrations were higher in the low water period (1.58–3.98 μg/kg) than those in the high water period (1.24–3.48 μg/kg) in sediments. A significant linear relationship existed between the ∑PCDE concentrations and TOC contents in sediments, but a poor linearity was found between ∑PCDE concentrations and DOC contents in water phase. Furthermore, the comparison of the percentage compositions in sediments and in water phase showed that CDE-30 (2,4,6-tri-CDE) was the predominant congener in the studied sites, and higher chlorinated congeners accounted for a larger proportion in sediments than those in water phase. In conclusion, the present study demonstrated the prevalent contamination by PCDEs in sediments and water from the Nanjing section of the Yangtze River.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
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2017
·
IF 3.33
Bing Li,Luwei Li,Qing Zhang,Weizheng Weng,Huilin Wan
Fructose is generated from glucose isomerization in water over attapulgite without any addition of metal compounds. The formation of fructose was related closely to the calcination processing of attapulgite. The highest fructose yield of 20.6% was obtained with the selectivity of 77.9% over attapulgite calcined at 500 °C. Moreover, attapulgite was characterized by BET, XRD, IR and CO 2 -TPD techniques. The results indicated that proper distribution and amount of basic sites were crucial for the selectivity of fructose as well as the structural properties of attapulgite.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Shibing Chen,Shengjie Jiang,Hongyu Guo,Fafu Yang
Previously reported fluorescent sensors for Th 4+ experienced emission quenching or generated false positive signal upon aggregate formation in aqueous media. Herein, a simple and novel thorium sensor ( CDB-BA ) based on cyanodistyrene structure was designed and synthesized, which integrated the highly emitting characteristic of AIE effect and off-on response of PET modulation for the first time to construct the “turn-on” fluorescent probe for Th 4+ . Besides excellent selectivity, CDB-BA exhibited remarkable fluorescent enhancement which was linearly related to the concentration of Th 4+ in the range of 0.25–8 μM. The detection limit was attained 0.074 μM, which was lower than that of most previously reported sensors. The mechanism of tris-chelate complex of CDB-BA with Th 4+ was confirmed by mass spectra, IR spectra and DFT calculation. The excellent Th 4+ sensing ability of CDB-BA was successfully applied to detecting Th 4+ on TLC plates, in real water samples and living-cell imaging. This work suggested that the combination of AIE and PET photophysical mechanism could offer the merits of minimized background and enhanced signal fidelity to develop novel “turn-on” fluorescent probe in complicated aqueous environment and biological research.
研究领域:
化学
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生物医学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ying Zhu,Furui Hu,Zi Yu,Yongxin Liang,Tao Gan,Huayu Hu,Zuqiang Huang,Yanjuan Zhang
The activation of reaction system for high-efficiency hydrogenation of levulinic acid (LA) into γ-valerolactone (GVL) is significant for sustainable development of biomass. Herein, based on a strategy of tourmaline (TM)-activated aqueous-phase system, a Cu-Ni/ZrO 2 @TM/C catalyst was facilely constructed by a totally solid-phase method. Cu-Ni/ZrO 2 @TM/C exhibited outstanding catalytic performance, benefiting from the spontaneous polarization and far-infrared radiation characteristics of tourmaline and the strong metal–metal and metal–support interactions. Under the optimum reaction conditions of 180 °C, 150 min, and 1.5 MPa H 2 , 100.0 % of LA conversion and 93.0 % of GVL yield were achieved. A variety of tests and theoretical calculations confirm that tourmaline with spontaneously polarized electric field and far-infrared radiation can break intermolecular hydrogen bonds to form small water clusters for activating aqueous-phase environment, facilitating the transport of active species as well as greatly reducing the hydrogenation barrier. The activating water effect of tourmaline, the acid sites and oxygen vacancies of ZrO 2 , and the alloying structure of Cu-Ni bimetal can synergistically benefit the transport of active species for reinforcing water-assisted proton hopping. Moreover, a reasonable tourmaline-activated aqueous-phase system was proposed to explain the enhanced aqueous hydrogenation of LA. This study innovatively illuminates the construction of functional non-precious metal catalysts for efficient aqueous-phase hydrogenation of biomass-derived chemicals.
研究领域:
化学工程
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催化科学
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可再生资源转化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）