INDUSTRIAL CROPS AND PRODUCTS
·
2015
·
IF 2.837
Xiao-Lin Qi,Xiao Peng,Yu-Yan Huang,Lu Li,Zuo-Fu Wei,Yuan-Gang Zu,Yu-Jie Fu
In the present study, deep eutectic solvents (DESs) as new extraction solvents, are proposed for the green and efficient extraction and separation of bioactive flavonoids from Equisetum palustre L. with negative pressure cavitation-assisted extraction (NPCE) combined with macroporous resin enrichment. A series of different DES systems were investigated for the extraction of bioactive flavonoids in E. palustre. Compared with conventional extraction solvents, DES composed of choline chloride/betaine hydrochloride-ethylene glycol possessed a more effective extraction yields. In addition, the DES-NPCE extraction procedures were also optimized systematically. The optimal conditions were obtained as follows: choline chloride-betaine hydrochloride-ethylene glycol formed a DES with the mole ratio of 1:1:2, 20% water content, extraction pressure −0.07 MPa, extraction temperature 60°C, solvent to solid ratio 25:1 mL/g, and the extraction time 20 min. Furthermore, the direct enrichment of nine flavonoids in DES extraction solution were efficiently achieved using macroporous resin HPD-826. The contents of the nine target flavonoids separated by HPD-826 resin were from 0.17% to 3.37%, and the recovery yields from 57.14% to 89.25%. In conclusion, the developed DES-NPCE combined with macroporous resin enrichment can be an alternative procedure for the green and efficient extraction and separation of bioactive flavonoids from plant sample matrices.
研究领域:
天然产物化学
·
植物化学
·
分析化学
·
药物分离与纯化
·
绿色化学
✓ 已验证
DOI
高影响因子
Journal of Applied Research on Medicinal and Aromatic Plants
·
2021
·
IF 3.4
Weizhuo Tang,Bin Wang,Miaomiao Wang,Mengmeng Wang
In this work, optimization of ultrasound-assisted extraction (UAE) of Osmanthus fragrans (OF) fruit oils from four representative species of OF groups was firstly performed. A Box-Behnken design was applied to investigate and optimize the process variables. Among them, the specie of OF var. latifolius Makino (OFL) had the highest oil yield (18.53 %) by UAE under the optimal conditions with an ultrasound extraction time of 33 min, ultrasound temperature of 52 ℃ and liquid-to-solid ratio of 12 mL/g. Furthermore, the fatty acid composition, physicochemical characteristics, and antioxidant activity of OFL fruit oil extracts obtained through UAE and Soxhelet extraction (SE) were determined and compared. The results demonstrated that the oil yield and fatty acid composition between UAE and SE were similar, while the oil obtained by UAE displayed superior physicochemical properties and antioxidant activity . These findings suggest that UAE represents an effective method for OF fruit oil extraction.
研究领域:
食品科学
·
天然产物化学
·
油脂化学
·
抗氧化研究
·
提取工艺优化
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 9
·e5082
·
IF 3.259
Dongmei He,Li Zeng,Guiqing Zhang,Qinggang Li,Wenjuan Guan,Zuoying Cao,Shengxi Wu
A new compound, α-aminophosphonate derivative containing pyridine ring (PPDE), was designed and synthesized as an extractant for the separation of nickel from metal impurities. Over 94.5% of Ni (II) extraction from sulfuric acid solution was achieved by using PPDE with an equilibrium pH of 4.02. Meanwhile, high separation coefficients of 23.8 for Ni to Co, 84.9 for Ni to Mn, 254.1 for Ni to Ca and 696.7 for Ni to Mg, respectively, were obtained. It was noted that PPDE exhibited an excellent regenerability, and the extraction of Ni with the recycled organic phase ranged from 92.5% to 93.9% during six circulations. The extracted nickel complex was determined as [Ni (PPDE) 2 (DNNSA − ) 2 (H 2 O) 4 ], which was supported by the data obtained from Fourier transform-infrared, UV–Vis and electrospray ionization-mass spectrometry spectra.
研究领域:
无机化学
·
湿法冶金
·
分离科学
·
配位化学
·
环境化学
·
资源回收
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 8
·2106323
·
IF 13.281
Jingwei Zhu,Benlin He,Xinpeng Yao,Haiyan Chen,Yanyan Duan,Jialong Duan,Qunwei Tang
The precise phase control of Cs-Pb-Br derivatives from 3D CsPbBr 3 to 0D Cs 4 PbBr 6 highly determines the photovoltaic performance of all-inorganic CsPbBr 3 perovskite solar cells (PSCs). Herein, the preferred phase conversion from precursor to Cs-Pb-Br derivatives is revealed by theoretically calculating the Gibbs free energies (∆ G ) of various phase conversion processes, allowing for a simplified multi-step solution-processable spin-coating method to hinder the formation of detrimental 0D Cs 4 PbBr 6 phase and enhance the photovoltaic performance of a PSC because of its large exciton binding energy, which is regarded as a recombination center. By further accelerating the interfacial charge extraction with a novel 2D transition metal dichalcogenide ReSe 2 , the hole-free CsPbBr 3 PSC achieves a champion efficiency of 10.67% with an impressive open-circuit voltage of 1.622 V and an excellent long-term stability. This work provides an in-depth understanding on the precise Cs-Pb-Br perovskite phase control and the effect of derivatives on photovoltaic performance of advanced CsPbBr 3 PSCs.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 3
·46984
·
IF 1.901
Xiaojuan Liu,Fengjing Wu,Chaktong Au,Qi Tao,Mingyu Pi,Wenhui Zhang
Molecularly imprinted polymer (MIP) for selective extraction of p -hydroxybenzoic acid ( p -HB) was synthesized by suspension polymerization using p -HB as template, 4-vinyl pyridine as functional monomer and ethylene glycol dimethacrylate as crosslinker. As characterized by scanning electron microscopy, the MIP particles are spherical, with size ranging from 1 to 8 μm. Compared with the non-imprinted polymer (NIP), the MIP shows higher binding capacity toward p -HB: maximum binding capacity for p -HB being 8.07 μmol g −1 over MIP and 3.88 μmol g −1 over NIP. The adsorption of p -HB on MIP follows the Freundlich model and displays pseudo-second-order kinetics. The results of selective and competitive binding experiments confirm that the molecularly imprinted sites have excellent recognition ability toward p -HB. The results reveal that the MIP is a promising adsorbent for selective extraction of p -HB from water samples. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46984.
研究领域:
环境科学
·
分析化学
·
高分子材料
·
污染物去除
·
分子识别
✓ 已验证
DOI
高影响因子
TheScientificWorldJOURNAL
·
2014
·Vol. 2014
·期 1
·857982
·
IF 1.219
Hongyu Xu,Gege Hu,Juane Dong,Qin Wei,Hongbo Shao,Ming Lei
In order to screen the Catalpa plant with high antioxidant activity and confirm the corresponding active fractions from Catalpa ovata G. Don, C. fargesii Bur., and C. bungei C. A. Mey., total flavonoid contents and antioxidant activities of the extracts/fractions of Catalpa plant leaves were determined. The determined total flavonoid content and antioxidant activity were used as assessment criteria. Those compounds with antioxidant activity were isolated with silica gel column chromatography and ODS column chromatography. Our results showed that the total flavonoid content in C. bungei C. A. Mey. (30.07 mg/g·DW) was the highest, followed by those in C. fargesii Bur. (25.55 mg/g·DW) and C. ovata G. Don (24.96 mg/g·DW). According to the determination results of total flavonoid content and antioxidant activity in 3 clones of leaves of C. bungei C. A. Mey., the total flavonoid content and antioxidant activity in crude extracts from C. bungei C. A. Mey. 6 (CA6) leaves were the highest. Moreover, the results showed that the total flavonoid content and antioxidant activities of ethyl acetate (EA) fraction in ethanol crude extracts in CA6 leaves were the highest, followed by n -butanol, petroleum ether (PE), and water fractions. Two flavonoid compounds with antioxidant activity were firstly isolated based on EA fraction. The two compounds were luteolin ( 1 ) and apigenin ( 2 ), respectively.
研究领域:
植物化学
·
天然产物化学
·
药用植物学
·
抗氧化研究
·
分子生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Jianwei Bai,Xiaofei Ma,Cen Gong,Yiming Chen,Huijun Yan,Kewei Wang,Jun Wang
Traditional adsorption resin prepared by a low efficiency method has a low porosity and surface area , which limits the adsorption performance of the resin. Therefore, a novel porous resin was developed by structural design of the resins through post- modification with HPA and a post-crosslinked method. The novel porous post-modification resin was successfully prepared by the multistep method. Meanwhile, the high surface area and abundant micropores in HCR-AO can improve the adsorption rate by accelerating the diffusion of uranium in the external diffusion stage. The removal capacity of HCR-AO increased 366% for HCR and 120% for PSD-AO at the same initial concentration. HCR-AO takes less time to reach equilibrium than PSD-AO and HCR. Excitingly, the adsorption amount of the material dropped only slightly even after 8 cycles. The short equilibrium time and outstanding removal efficiency makes it a novel candidate for further extraction of U (VI) from seawater .
研究领域:
环境化学
·
核化学
·
材料科学
·
吸附分离
·
海洋资源提取
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 63
·39523-39529
·
IF 3.108
Wenhui Zhang,Yang Ding,Yue Jiang,MingZhi Zheng,Sujuan Wu,Xubing Lu,Min Zeng,Xingsen Gao,Qianming Wang,Guofu Zhou,Jun-ming Liu,Krzysztof Kempa,Jinwei Gao
Interface engineering has been proved to be a practical strategy to enhance power conversion efficiency (PCE) and stability of perovskite solar cells. Recently approaches involving ultra-thin layer deposition and vacuum-processing, while improving PCE, increase the processing complexity, and thus the overall cost. In this paper, we demonstrate a high-efficiency inverted planar perovskite solar cell, obtained with a simple wet-chemistry based, room-temperature, and cost-effective process, which synthesizes two interfacial layers: solution processed molybdenum oxide (named s-MoOx) for anode and titanium(IV) oxide bis(2,4-pentanedionate) (TOPD) for cathode buffer layers. Steady-state photoluminescence (PL), time resolved photoluminescence (TRPL) and electrochemical impedance spectroscopy (EIS) are conducted to characterize the charge transport properties, confirming an enhanced charge extraction efficiency and a suppressed charge recombination. In addition, the introduction of the interfacial layers facilities formation of an ohmic contact with the metal electrode, reducing the charge transfer resistance and increasing the FF to as high as 80.7%. The optimized solar cells achieve the best PCE of 16.04% which far exceeds the PCE of devices without these interfacial layers (PCE = 11.2%).
研究领域:
材料科学
·
能源科学
·
纳米技术
·
表面与界面化学
✓ 已验证
DOI
高影响因子
Journal of Global Antimicrobial Resistance
·
2016
·
IF 1.087
Dongmei Wu,Ruochen Lu,Yuquan Chen,Jie Qiu,Chaocheng Deng,Qiang Tan
This study aimed to determine whether selection by antibiotics, chlorhexidine (CHX) and Rhizoma coptidis extract (RCE) would lead to cross-resistance or decreased susceptibility in Staphylococcus aureus . The S. aureus reference strain ATCC 25923 as well as 14 clinical isolates were exposed to antibiotics, CHX and RCE at sublethal doses for up to 14 days. Changes in susceptibility were determined by analysis of minimum inhibitory concentrations (MICs). All isolates were cross-resistant to more than one other antibiotic following tetracycline exposure, and increased resistance (≥4-fold MIC increase) to RCE and CHX was observed in six and three isolates, respectively. Following selection by CHX, most of the treated strains showed no significant change in sensitivity to CHX. However, all strains developed cross-resistance to at least one antibiotic, and decreased susceptibility (≥4-fold MIC increase) to RCE appeared in seven strains. Following exposure to RCE, 11 isolates showed cross-resistance to at least one antibiotic. In addition, three RCE-exposed strains showed reduced susceptibility to CHX (4- or 8-fold MIC increase). The results obtained in this study imply that antibiotics, biocides and antimicrobial Chinese herbs might employ some of the same mechanisms of action against bacteria, triggering mutual cross-resistance to further foster the development of bacterial resistance.
研究领域:
微生物学
·
感染病学
·
药理学
·
分子生物学
·
抗菌药物耐药性
·
天然药物学
✓ 已验证
DOI
高影响因子
EcoMat
·
2021
·Vol. 3
·期 5
·e12134
·
IF 0
Weixia Lan,Jialu Gu,Shiwei Wu,Yan Peng,Min Zhao,Yingjie Liao,Tao Xu,Bin Wei,Liming Ding,Furong Zhu
Improved efficiency and stability of the organic solar cells (OSCs) are the critical considerations for practical applications. The interface between the interlayer and bulk heterojunction has recently been shown as one of the weak links associated with the degradation in the nonfullerene acceptor (NFA)-based OSCs. It shows that the removal of the interfacial chemical reactions between the 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (INCN) moieties in NFA and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) hole extraction layer (HEL) is desired for enhancing the device stability. In this work, we show that the use of a bilayer MoO 3 /antimonene HEL favors the operational stability in OSCs through maintaining a high built-in potential and suppression of an undesired interfacial reaction between INCN moieties in NFA and the PEDOT structures in PEDOT:PSS. A power conversion efficiency of 16.68% is also obtained for the OSCs with a bilayer MoO 3 /antimonene HEL, prepared using a blend system of PM6:Y6, demonstrating its suitability for high-performance OSCs.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
表面化学
·
器件物理
✓ 已验证
DOI
ADVANCED POWDER TECHNOLOGY
·
2022
·Vol. 33
·期 11
·103807
·
IF 4.969
Jingxi Zhang,Yifan Niu,Yu Zhou,Shaohua Ju,Yongwan Gu
In this study, green tea was used as a reducing agent to prepare GT-nZVI/Cu nano-zero-valent iron-copper bimetallic materials for nitrate degradation. Through single factor experiments, the process conditions for nitrate removal by GT-nZVI/Cu were optimized. By measuring the contents of nitrate, nitrite, and ammonia nitrogen in the reaction products, the reduction pathway of nitrate-nitrogen in GT-nZVI/Cu was studied. In addition, the removal mechanism of nitrate by GT-nZVI/Cu was also analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and kinetic experiments. The results showed that the size of GT-nZVI/Cu particles is between 50 and 70 nm, and they are irregular spherical shapes. The polyphenol antioxidants in green tea make GT-nZVI/Cu have stronger antioxidant properties, and the denitration products are mostly nitrogen. The addition of copper ions accelerates the reaction time and reaction rate. The maximum removal rate of nitrate by GT-nZVI/Cu within 75 min can be up to 99 %. After three repeated experiments, the removal rate of GT-nZVI/Cu can still reach 70 %. The removal mechanism of GT-nZVI/Cu has enhanced nitrate removal through complexation, redox, and adsorption co-precipitation. This study provides a new route for the green preparation and efficient application of nZVI.
研究领域:
环境化学
·
纳米材料科学
·
水处理技术
·
环境功能材料
·
污染控制化学
·
应用催化
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiaoyu Zhao,Guangyu Li,Minghui Feng,Yanfei Wang
Compared to traditional extraction of lithium using solar evaporation, the electrochemical extraction is advantageous in many aspects, including elevated efficiency, superior selectivity, and low environmental pollution. In this study, LiNi 0·038 Mo 0·012 Mn 1·95 O 4 (LNMMO) with good lattice structure and nano morphology was successfully prepared and confirmed by XRD (X-ray diffraction), SEM-Mapping (scanning electron microscope mapping), SEM (scanning electron microscope), and EDX (Energy-dispersive X-ray spectroscopy) analyses. The pairing of LNMMO with activated carbon (AC) yielded obvious cost-effective and environmentally friendly composite when compared to conventional Noble metals used for battery anodes, such as Ag and Pt. A hybrid supercapacitor was assembled using delithiated LNMMO cathode (NMMO) and AC anode to form NMMO/AC. The cell showed high capacity, high rate performance, and excellent cyclic stability. A continuous flow NMMO/AC hybrid supercapacitor (CF-NMMO/AC) was developed for selective capture of Li + in aqueous solution by combining NMMO/AC hybrid supercapacitor with self-designed continuous flow control system. The device delivered high Li + extraction efficiencies reaching 14.4 mg/g per one cycle in simulated brine by consuming only 7.91 W h/mol Li + . The overall process produced 97.2％ Li + in simulated brine at optimized operating conditions. Overall, CF-NMMO/AC system provided higher efficiency, superior selectivity, and moderate energy utilization for Li + recovery from brine.
研究领域:
电化学
·
环境科学
·
材料科学
·
能源工程
·
分离科学
·
可持续技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）