Natural Product Communications
·
2020
·
IF 0.468
Weida Zhang,Shaobo Cheng,Xiaona Zhai,Junshe Sun,Xuefang Hu,Haisheng Pei,Guogang Chen
Deep eutectic solvents (DESs) were proposed for the extraction of polysaccharides from Poria cocos (PCPs). Six types of DESs were prepared, and the DES composed of choline chloride and oxalic acid was proved to be suitable. Based on the results of single-factor test, the Box-Behnken experimental design with response surface methodology was carried out, giving the optimal extraction conditions including mole ratio of 1:2 (choline chloride:oxalic acid) and extraction 15 minutes at 100°C. Under the optimal extraction conditions, the extraction yield (46.24% ± 0.13%) was 8.6 times higher than that of hot water. The reusability of DES was demonstrated by a 6-run test, and an extraction yield of PCP was 38.40% ± 0.23% after reusing for 6 times without adding any additional chemicals. Moreover, molecular weight distributions of the resulting PCP were analyzed, and then mainly distributed in the range of 753 to 3578 g/mol. Therefore, DESs were proved to be an excellent extraction solvent alternative to the extraction of PCP.
研究领域:
植物化学
·
食品科学
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2025
·
IF 2.6
Zhang Xin,Xiao Yuying,Li Wenlong,Gong Ming,Huang Ziqin,Wang Ji,Zeng Deqian,Chen Lifeng,Wei Yuezhou
To extract Lu from LiCl–KCl molten salt, the electrochemical behavior of Lu(III) were explored by different electrochemical methods. Cyclic voltammetry (CV), reverse chronopotentiometry (RCP) and square-wave voltammetry (SWV) demonstrated that Lu metal was formed by one-step three-electron transfer when Lu(III) was reduced on W electrode, and the electrode reaction is reversible controlled by diffusion. The diffusion coefficient of Lu(III) in molten salt was calculated to be 1.68 × 10 –5 cm 2 s −1 by SWV. Only BiLu was formed when the co-deposition of Lu(III) and Bi(III) was conducted at 773 K, which was confirmed by anode chronopotentiometry. The influence of temperature on the types of Bi-Lu intermetallic compounds was also explored. In addition, the thermodynamic parameters of BiLu were estimated by open circuit chronopotentiometry. The extraction efficiency of Lu(III) reach up to 89.54% when the constant-current electrolysis continued for 12 h based on the result of ICP-OES, and the product was characterized by SEM–EDS.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 8
·3722-3730
·
IF 3.5
Shiquan Cao,Yujia Kang,Huiping Tang,Zhi Chen
The extraction of lead-212 (212Pb) from radioactive thorium (Th) waste is immensely important, as it serves to mitigate environmental risks associated with radioactive waste and provides a vital source for medical isotopes. To economically extract 212Pb from thorium, we synthesized a novel extractant known as 2,13-disulfonyldiethylamine dibenzo-18-crown-6 (DSADB18C6). We assessed its performance in isolating Pb(II) by employing stable lead and optimizing the parameters of the extraction system. The results showcased an exceptional ability to extract Pb(II) efficiently. Within 10 minutes, using 20 mmol of DSADB18C6 and under conditions of 10 mg L−1 lead concentration (HNO3 = 0.5 mol L−1), the extraction efficiency reached up to 96.1%. Even after four rounds of stripping with 0.4 mol L−1 ammonium citrate, the efficiency remained at 90.2%. Moreover, the extraction stoichiometry and thermodynamics revealed that DSADB18C6 exhibited superior extraction performance compared to the commercial extractant 4′,4′′,(5′′)-di-(tert-butyldicyclohexano)-18-crown-6 (DtBuDC18C6), in line with the density functional theory (DFT) calculation result. Furthermore, we successfully separated 212Pb from the thorium nitrate solution, maintaining radioactive equilibrium with its progeny. Gamma-spectroscopy confirmed a recovery yield of extraction exceeding 85.7%. This study presents a viable approach, underscoring the potential of DSADB18C6 as a promising extractant for the effective separation of 212Pb from radioactive thorium sources.
研究领域:
放射化学
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核医学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhiyuan Zhang,Guixia Fan,Guoli Zhou,Daoguang Teng,Hongyan Nan,Peng Li,Yijun Cao,Jiongtian Liu
Germanium, a critical metal, is predominantly located in lignite and lead–zinc ore. The germanium was commonly extracted from the fly ash of germanium-rich lignite (GRL), however, facing the challenges of specific combustion conditions, low lignite’s thermal efficiency and value, high CO 2 emissions, and waste acid treatment. Therefore, in this work, a novel method for directly leaching germanium from the GRL was proposed, facilitating low-carbon extraction under mild conditions, and reducing lignite loss during leaching process. Results showed that leaching germanium from the GRL using thionyl chloride achieved the goals of “kill two birds with one stone”, i.e. , leaching efficiency of germanium above 95 wt % and recovery yield of lignite over 95 wt %. Specifically, the theoretical leaching efficiency of germanium reached 99.60 wt % while the recovery yield of lignite reached 86.35 wt %, at the temperature of 20 °C, liquid–solid ratio of 4 mL/g, and leaching time of 6 h. Most of the leached germanium was remained in the aqueous phase after the leaching solution was quenched, facilitating the subsequent separation of germanium. In this study, efficient extraction of germanium from the GRL was achieved with a high recovery yield of lignite, preserving the matrix structure and main composition of lignite. Therefore, this method provides a feasible way for efficient extraction of germanium from lignite with low-carbon emission under mild condition.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jing Zhang,Wenyu Xie,Shasha Chu,Zhangbin Liu,Zhen Wu,Yingying Lan,Vladimir V. Galvita,Lijuan Zhang,Xintai Su
Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr 2 O 3 cannot be extracted after chromite sodium roasting and remains in COPR, wasting valuable Cr resources. In this study, Mg was selectively removed by using (NH 4 ) 2 SO 4 roasting in combination with H 2 SO 4 leaching. The results showed that the selective removal of 79.55% Mg from COPR could be achieved under the optimum (NH 4 ) 2 SO 4 roasting conditions (80 mmol (NH 4 ) 2 SO 4 , 800 °C, 2 h). During the subsequent sodium roasting and acid leaching stages, the Cr extraction rate was 84.63% for the COPR direct roasting and 95.39% for the Mg removal residue roasting. The increased Cr extraction efficiency is attributed to the transformation of Mg-rich spinel and diopside (the Mg & Cr coexisting phases) in COPR converted into easily extractable (Fe,Cr) 2 O 3 and Cr 2 O 3 after the Mg treatment. This study investigated that the phase transformation of the Cr host phases is crucial for the sufficient extraction of Cr and provides inspiration for the development of efficient and practical Cr extraction techniques. Moreover, the method can be extended to the effective extraction of Cr from other Cr-containing wastes.
研究领域:
冶金工程
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2017
·
IF 4.601
Youan Ji,Yucui Hou,Shuhang Ren,Muge Niu,Congfei Yao,Weize Wu
Indole plays a significant role in the production of products such as spices, medicines, and exogenous auxins. Deep eutectic solvents (DESs) formed by indole and quaternary ammonium salts (QASs, including tetraethylammonium chloride-TEAC, tetrapropylammonium chloride-TPAC, triethylmethyl-ammonium chloride-TEMAC) were found and proposed to efficiently extract indole from model wash oil. The effects of time, temperature, mole ratio of QAS to indole and initial indole concentration on the extraction of indole were studied. The results indicate that these QASs can extract indole from wash oil with efficiencies up to 96.7% (TPAC). The extraction process can be finished within 5 min. It is also found that the ultimate concentrations are almost identical for one kind of QAS although their initial concentrations are different, and the indole concentration in model wash oil can be reduced to a very low level of 1.3 g/dm 3 (TPAC). The maximum distribution coefficients of indole are 40.8 for TEAC, 91.9 for TPAC, and 29.5 for TEMAC at the studied conditions, and the extraction ability follows the order of TPAC > TEAC > TEMAC. Moreover, QASs in DESs can be reused without obvious reduction in extraction efficiency. The extraction mechanism was studied by FT-IR, and the results indicate that there is a hydrogen bond between QAS and indole. Finally, a comparison was made between this method and other methods to verify and demonstrate its desirable properties of efficiency and environmentally friendliness.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
PETROLEUM CHEMISTRY
·
2021
·Vol. 61
·期 9
·1052-1060
·
IF 1.029
Liu Linhai,Xie Wenjing,Liu Xunzheng,Fang Hansun,Wen Yangping,Shu Chenhua
Abstract In this study a class of DESs based on triethylamine (TEA) and aromatic acids
was synthesized and used in the extractive denitrogenation of model oil fraction
firstly. The structures of DESs were characterized by nuclear magnetic resonance
and Fourier transform infrared spectrometer. The factors that influence
extraction efficiency and distribution coefficient were investigated. The
extraction performance of TEA/ o -hydroxybenzoic acid (OHBA) is better than that of TEA/benzoic acid
and TEA/ o -methylbenzoic acid. The extraction
efficiencies of quinoline and indole reach up to 99.1 and 98.3% only through two
extraction stages, respectively. The extraction efficiency is not sensitive to
reaction temperature and initial nitrogen content. The DESs based on TEA and
aromatic acids exhibit excellent regeneration performance. In summary, the DESs
based on TEA and aromatic acids are excellent extracting agents for basic and
non-basic nitrogen compounds and will become promising extracting agents for the
oil fraction denitrogenation.
研究领域:
化学工程
·
石油加工
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DOI
高影响因子
PHYTOCHEMICAL ANALYSIS
·
2022
·Vol. 33
·期 8
·1246-1256
·
IF 3.024
Ying Xu,Yiqun Wan,Fan Liu,Jinping Chen,Ting Tan,Lan Guo
Introduction Anthraquinones are considered to be an important class of bioactive substances in Cassiae semen , and the content of anthraquinones is an essential indicator of the quality of Cassiae semen raw herbal materials. Objectives The present study aimed to propose a novel, efficient and effective ultra-high-performance liquid chromatography (UHPLC) method for the simultaneous determination of aurantio-obtusin, aloe-emodin, rhein, obtusin, emodin, chrysophanol and physcion, with the help of natural deep eutectic solvents (NADESs) as extraction solvents. Methodology NADESs were introduced to the simultaneous extraction of anthraquinones from Cassiae semen samples. Several NADESs were designed by menthol, choline chloride, d -glucose as hydrogen bond acceptors, with nine different acids and appropriate water as hydrogen bond donors. The parameters affecting the extraction efficiency of seven anthraquinones were demonstrated in detail. Results Among the obtained NADESs, the highest extraction efficiency was demonstrated by a solution consisting of d -glucose, lactic acid and water with a molar ratio of 1:5:4. The seven anthraquinones were separated on an ACQUITY UPLC® BEH C 18 column (2.1 mm × 100 mm, 1.8 μm) and detected within 12 min by a photodiode array (PDA) detector at 254 and 284 nm. The limits of detection and quantitation were from 1.00 to 7.26 μg/l and 3.29 to 24.22 μg/l, respectively. And Cassiae semen sample-based recoveries ranged from 81.13% to 113.78% with the relative standard deviation (RSD) ( n = 6) of 1.4% to 10.1%. Conclusion The developed method demonstrated that NADESs were applied successfully to analyse the anthraquinones in Cassiae semen samples collected from different regions in China.
研究领域:
中药学
·
分析化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 19
·13790-13800
·
IF 2.993
Guo Yaoguang,Li Yaguang,Lou Xiaoyi,Guan Jie,Li Yingshun,Mai Xianmin,Liu Hu,Zhao Cindy Xinxin,Wang Ning,Yan Chao,Gao Guilan,Yuan Hao,Dai Jue,Su Ruijng,Guo Zhanhu
Cobalt (Co) and lithium (Li) were extracted from pure LiCoO 2 powders and actual cathode material powders from the spent lithium-ion batteries (LIBs) after l -ascorbic acid dissolution via a mechanical activation process. The influences of activation time and rotation speed on the leaching were discussed. The mechanism of the improved leaching yield was proposed based on the characterization analysis including X-ray diffraction, scanning electron microscope, BET-specific surface area and particle size analyzer. The reduced particle size, increased specific surface area of activated samples, destroyed crystal structure and amorphous state of LiCoO 2 contributed to the improved leaching efficiencies of Co and Li. With the activated process, about 99% Co and 100% Li were extracted from actual spent LIBs after 60-min grinding at 500 rpm with mild conditions. This effective process would be of great importance for recovering valuable metals from the spent LIBs at room temperature.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Jianguang Qi,Yufeng Hu,Yue Gao,Weiting Ma,Shuqin Mo,Zhenyu Yang,Xianming Zhang,Liuyi Yin
Extraction was a key step in industrial process of trioxane . NaOH was utilized in industrial production of trioxane to maintain appropriate pH to prevent trioxane decomposition. Here efforts were made to investigate the salt effects that can produce an alkaline medium to prevent trioxane decomposition and, simultaneously, can induce salting-out effect to considerably increase the efficiency of extraction of trioxane from aqueous formaldehyde solutions. The salt considered included K 3 PO 4 , Na 3 PO 4 , sodium tartrate (Na 2 C 4 H 4 O 6 ) and sodium citrate (Na 3 C 6 H 5 O 7 ). The decomposition measurements were made for the (trioxane + formaldehyde + salt + H 2 O) solutions at 323.15 K for 96 h. No trioxane decomposition was detectable over the whole experimental time. Extraction measurements were made using each of the selected salts or NaOH as accelerant salt and benzene, dichlorobenzene or dimethylbenzene as extraction solvent . The results showed that both the extraction efficiency and the distribution coefficient were considerably increased and that such effects followed the order Na 3 PO 4 > K 3 PO 4 > Na 3 C 6 H 5 O 7 > Na 2 C 4 H 4 O 6 > NaOH. The results also showed that the effects of these salts on the water content in the organic phase and on the organic phase residual in the water phase were generally similar to or even more favorable than those of NaOH. The liquid−liquid phase equilibrium data were measured for the (trioxane + formaldehyde + K 3 PO 4 + H 2 O + benzene) solutions at (313.15, 323.15 and 333.15) K and were found to be well described by the Othmer−Toblas and the Hand equations.
研究领域:
化学工程
·
工业化学
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Yu Zhang,Si Wu,Qian-Qi Chen,Peng-Fei Yu,Hai-Ming Zhao,Nai-Xian Feng,Bai-Lin Liu,Yan-Wen Li,Quan-Ying Cai,Lei Xiang,Ce-Hui Mo,Qing X. Li
Fluorotelomer alcohols (FTOHs), as precursors of perfluoroalkyl carboxylic acids, are difficult to analyze due to their high volatility and matrix interference. A method based on single-factor experiments and response surface methodology design was developed for simultaneous analysis of three common FTOHs in vegetables and soils, using single extraction, dispersive solid phase extraction cleanup, and gas chromatography–mass spectrometry in negative chemical ionization. The method improved the extraction efficiency up to ∼40 folds and showed a commendable linearity range (1–100 ng/mL, R2 > 0.991), low limit of detection (0.025−0.897 ng/g, dry weight (dw)), and high accuracy and precision (83 ± 7.2–117 ± 6.0% recoveries at 2–20 ng/g fortification levels). It was successfully applied to determine the FTOHs in real vegetables and soils, demonstrating its feasibility for routine analysis. Concentrations of the FTOHs ranged from 3.5 to 37.9 ng/g (dw) and from 6.5 to 141.0 ng/g (dw), respectively, in the vegetables and soils collected nearby fluorochemical factories, which warrants further investigations on FTOH pollution and food safety concerns for which the developed method will be useful.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2022
·
IF 2.745
Feng Liu,Li Chen,Kangling Yin,Taotao Fan,Zongcheng Yan
In this work, a novel liquid–liquid biphasic system of sugar-based deep eutectic solvents (DESs) was studied. The liquid–liquid biphasic system was formed when sugar-based DESs and n-propanol (NPA) showed incompatibility in an aqueous solution at above critical concentrations and 298.15 K. The DESs were prepared by choline chloride and sugars (sucrose, glucose, fructose, and xylose). The influence of the hydroxyl group and structure of HBD on the phase behavior was evaluated using phase diagrams and tie-lines length (TLL). Results showed that the biphasic region of DESs-based system was expanded by enhancing the hydrophilic of HBD. Each HBD (sucrose, glucose, fructose) and choline chloride can form ternary system with NPA and water. With this phase behavior, the molar ratio of DESs in two phases is the same as the original ratio of the DES formation. A non-random two-liquid (NRTL) model was used to correlate the tie-lines data of the systems, and the binary interaction parameters of the model were then obtained. Shikimic and vanillic acids used as biomolecule probes in two phases was studied to further explore the extraction potential of these DES-based systems. This work showed that the nature of HBDs influences the distribution behavior of shikimic and vanillic acids. And the DES-based systems presented higher extraction efficiencies (from 88.02% to 91.90%) for shikimic acid, which shows good extraction levels.
研究领域:
化学工程
·
生物技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）