JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 1
·339-348
·
IF 1.137
Zhao Jialin,Sui Ying,Peng Xiujing,Sun Guoxin,Cui Yu
Abstract Nuclear grade zirconium and hafnium are the key to promoting the development of nuclear industry. We designed and synthesized a new diphosphonic acid extractant N , N - n -octylamine di(methylene phenylphosphinic acid) (OADMPPA) with excellent extraction ability and priority for extraction of zirconium. This paper focused on the changes in extraction mechanisms and composition of complexes. With increasing concentration of HCl, cation exchange mechanism gradually changed into solvation mechanism, and complexes converted in the order of ZrOA, Zr(HA) 2 Cl 2 and ZrCl 4 ·H 2 A. Compared with bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex272), OADMPPA could increase the extraction rates of zirconium and hafnium by 7.2 and 12.6 times. Graphic abstract
研究领域:
化学工程
·
核工业
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 327
·期 3
·1251-1258
·
IF 1.371
Fu Xuan,Zhang Fang,Wu Qiang,Li Yang,Huang Qing-Gang,Yan Ze-Yi
In this study, extraction and separation of thorium(IV) and a few representative rare earths in HNO 3 media was evaluated using trioctylmethylammonium nitrate ([A336][NO 3 ]) ionic liquid. An unexpected novel extraction mechanism was identified based on the studies in the slope analysis and ESI–MS spectrum. The trimer of [A336][NO 3 ] was confirmed to dominate the extraction reaction by ESI–MS spectrum before and after the extraction. The extraction efficiency of La(III), Eu(III) and Lu(III) by [A336][NO 3 ] are much lower than Th(IV) in acid medium, which means that it is possible to separate thorium from rare earths or the rare earth ores by using [A336][NO 3 ].
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Weiwei Hu,Huan Cheng,Dongmei Wu,Jianle Chen,Xingqian Ye,Shiguo Chen
The rhamnogalacturonan I (RG-I) region of pectin shows health benefits and novel gel applications. Commercial pectin is extracted from citrus peel in most instances, whereas they are homogalacturonan (HG)-dominated productions and the methods to extract pectin targeting RG-I are limited. To take full advantage of citrus wastes and upgrading this pectin resources, a new extraction method based on a diluted NaOH assisted by a combination of ultrasound (US) and pressure, namely manosonication (MS), was established for RG-I enriched pectin extraction. MS significantly enhanced the pectin yield (21.47 ± 0.11%) while reducing the use of NaOH reagents (50 mmol/L) and processing time (50 min). Structurally, the MS (300 kPa) resulting products achieved nearly a 2-fold greater RG-I content (58.61 mol%) than that of commercial pectin (30.12 mol%). Moreover, for the investigation of the extraction mechanism, external pressure enhanced the cavitation effect, as the calorimetric intensity increased from 1.28 W/mL (100 kPa) to 3.3 W/mL (350 kPa). A sufficient ultrasonic mechanical action allowed for obtaining RG-I enriched products with large molecular weight (9.506 × 10 4 –2.813 × 10 5 ) and low degree of methoxylation. Transmission electron microscopy (TEM) and scanning electron microscopies (SEM) verified the increased disintegration of the cell wall tissue by MS. Raman imaging and immunofluorescence labeling suggested the synergistic effect of pressure and ultrasound on enhancing the yields and RG-I content. This new method provided alternations in functional polysaccharides extraction, and the yield and structure of citrus RG-I enriched pectin strongly indicates the potentials of MS in other RG-I rich vegetables applications.
研究领域:
食品科学
·
植物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Hailan Wang,Fu Gu,Xiulian Ren,Qifeng Wei
The utilization of algal ingredients for producing functional products has garnered significant attention. Furthermore, increasing the yield of polysaccharides has become a crucial point. In this work, the efficiencies of two-step extraction and co-extraction were compared, and dimethylamine solution was selected as the optimal extractant. Under the optimum extraction conditions (temperature of 75.00 °C, time of 3.15 h, liquid-solid ratio of 35.00 mL/g) determined by response surface methodology, the yield of alginate was 16.05 ± 0.37 % and the yield of fucoidan was 2.85 ± 0.08 %. Kinetic analysis of the extraction process was conducted using the shrinking core model, elucidating the rate and mechanism of product release. Additionally, it was demonstrated that the dimethylamine solution could be recycled for five times with stable extraction performance. The extraction mechanism was further analyzed by quantum chemical calculations, providing theoretical support for the extraction process of the products. The above results demonstrated that the higher yield of products extracted with dimethylamine was confirmed through experimental and quantum chemical analysis. Overall, this study provides a new perspective on the extraction of alginate and fucoidan from seaweed.
研究领域:
海洋生物学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2020
·
IF 3.338
Lei Tian,LinQing Huang,Jiacong Xu,Xiaoqiang Yu,Zhifeng Xu
Under the advocacy of the sustainable development concept, the extraction process and reaction mechanism for arsenic in alkaline solution were studied with the aim of optimizing the alkaline leaching process of high‑arsenic copper smelting ash and promoting the recovery and harmlessness of arsenic. At 25 °C, the extractant methyltrioctylammonium underwent 6–8 conversions of Na 2 CO 3 solution with a concentration fraction of 12%, and the extraction capacity of thioarsenite was increased to 86.91%. Furthermore, at 25 °C, at an O/A ratio of 1:1 and an phase contact time of 7 min, the thioarsenite stripping exceeded 99%, when using 4% H 2 O 2 + saturated Na 2 CO 3 solution as the stripping. Fourier transform infrared spectroscopy , nuclear magnetic spectroscopy, ultraviolet spectroscopy , and other analytical methods were used to determine the mechanism of the extraction process. It was evident from our experiments that the CO 3 2− -type TOMAC and Na 2 CO 3 solutions could be recycled and reused repeatedly. The overall process required simple materials and did not generate liquid waste . The technique involves a short process, with superior cycle performance, low cost, and high efficiency.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Yanjing Li,Shilong Dong,Lili Wang,Xiaoyan Sun,Wenying Zhao,Shuguang Xiang
LLE data of cyclooctane/3-methylpentane + benzene/toluene + N -methylpyrrolidone (NMP) at 298.15 K and 313.15 K under a pressure of 101.3 kPa were measured in this work. The Othmer-Tobias and Hand equations were adopted to validate the reliability of LLE data, where the correlation coefficients ( R 2 ) were close to unity, indicating the high reliability of the experimental data. The experimental data were analyzed using the distribution coefficient ( D ) and separation factor ( S ), and the effect of NMP extracting benzene and toluene from aromatics was explored. Meanwhile, the reason for the different extraction efficiencies of benzene and toluene using NMP was analyzed by quantum chemical calculations. The NRTL and UNIQUAC thermodynamic models were used to correlate the liquid–liquid equilibrium data, and the relevant binary interaction parameters were obtained. The calculated root mean square deviation (RMSD) were all less than 0.0063, indicating that the obtained binary interaction parameters can be used to simulate and calculate the extraction of aromatics using NMP.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Yin Zhu,Zhikai Cao,Liming Che,Haiqiang Lin,Quancong Zhang,Hua Zhou
3,4-ethylenedioxythiophene (EDOT) is a significant material in the electronics industry for synthesizing Poly (3,4-ethylenedioxythiophene) (PEDOT). However, a significant amount of EDOT (>50%) is discarded in wastewater during the electrochemical polymerization of PEDOT owing to the low conversion of EDOT. To address this issue, a process for recovering EDOT through extraction and subsequent distillation was presented. Toluene was chosen as the extractant through a combination of COSMO-SAC and experiments, and the extraction mechanism was analyzed by quantum chemistry calculation. Next, the liquid-liquid equilibrium (LLE) data for the quaternary system of water, ethanol, toluene, and EDOT were obtained and fitted with the NRTL model. Furthermore, the recovery process was simulated and optimized. The results indicate that the recovery ratio of EDOT is higher than 99.8%, and the profit of per ton wastewater is 5756.97 CNY. The proposed process shows great potential for industrial application and cleaner production.
研究领域:
化工工程
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jianwei Zhang,Ronghao Liu,Xiaoxia Liu,Jun Li,Ruihui Wu,Yanzhao Yang
Rhodium, as a rare precious metal, has always been a challenge for the chemical industry to efficiently recover rhodium by extraction due to the complex existing situation in hydrochloric acid medium. Herein, a strongly hydrophobic DABCO-based ionic liquid (IL) [C 8 DABCO][NTf 2 ] was designed and synthesized to construct a solvent-free extraction system of Rh(III) from high-concentration hydrochloric acid medium. At first, the effects of some important parameters on Rh(III) extraction were studied, such as equilibrium time, IL dosage, hydrochloric acid concentration, and initial Rh(III) concentration, the results showed that 81.54% Rh(III) can be extracted under the optimum extraction conditions. Based on the experimental run results, a quadratic model equation was established by using the response surface method (RSM), which can be used to calculate the amount that [C 8 DABCO][NTf 2 ] will be offered at various HCl concentrations during the actual extraction of Rh(III). Then, using Job's method, the Ultraviolet visible spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FT-IR), Energy-dispersive X-ray spectroscopy (EDS), and Electrostatic potential (ESP) prove that the extraction mechanism is an anion exchange mechanism. Finally, in the mixed solution of multi-metals, the extraction efficiency of [C 8 DABCO][NTf 2 ] for Rh(III) is not disturbed, and the extraction efficiency for other metals is less than 1%. And the single-stage stripping efficiency of Rh(III) was up to 88% through HCl stripping, which solved the problem of difficult stripping of Rh(III) solution and realized the recycling of IL. The study provides a reliable and efficient way for recovering Rh(III) from high-concentrations HCl solutions.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Jianwei Luo,Zhengmin Yang,Xinghai Huang,Jinyun Cai,Haiyi Zhong
For the advancement of an environmentally friendly and sustainable plant industry, an excellent high-efficiency extraction procedure was exploited for total flavonoids from Sophorae Tonkinensis Radix Et Rhizoma (STRR) based on deep eutectic solvents (DESs) integrated with ultrasonic-assisted extraction (UAE). A comparative study assessed the extraction performance of traditional organic solvents and 17 DESs, with the choline chloride and acrylic acid combination yielding the best results. Optimization through response surface methodology (RSM) achieved a maximum flavonoid yield of 3.785 ± 0.026 mg/g under optimal conditions: 61 min, 65 ℃, solid/liquid ratio 1:148 g/mL, molar ratio 1:4, and 20 % water content. HPLC-MS was employed to quantify the three flavonoids (quercetin, rutin, and formononetin) in the extract, revealing their extraction yield in the DES to be 3.039 ± 0.226 mg/g, 41.274 ± 2.545 mg/g, and 73.926 ± 6.603 mg/g, respectively. These levels are 2–4 times higher than those in the methanol and ethanol extracts. Furthermore, the extraction mechanism was further elaborated with density functional theory (DFT) analysis showing the presence of non-covalent interactions (hydrogen bonding and van der Waals forces) between DES and the samples. The analysis highlighted the excellent extraction performance of DES from multiple aspects and perspectives, including electrostatic potential (ESP), mutual penetration distance (MPD), interaction region indicator (IRI), binding energy, and electrostatic potential quantitative distributions. Thus, the findings of this study demonstrate that DES-UAE represents a highly efficient and environmentally sustainable approach for extracting bioactive compounds from plants, thereby providing valuable support for the development and application of this green extraction technique in the plant industry.
研究领域:
植物学
·
药学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Yan Kang,Liu Liping,Zhao Hongxing,Tian Lei,Xu Zhifeng,Wang Ruixiang
To overcome the problem of arsenic separation and enrichment from an alkaline leaching solution in arsenic-containing dust, a CO32--type tri-n-octylmethyl-ammonium chloride (TOMAC) method for extracting thioarsenite is proposed in this paper. Considering an alkaline leaching solution as the research object, after vulcanization pretreatment, TOMAC transformation and organic phase saturated extraction capacity were measured, and the extraction mechanism was preliminarily studied. First, Cl−-type quaternary ammonium salt was effectively transformed to HCO3--type by treating organic phase with saturated NaHCO3five times. TOMAC was effectively transformed from HCO3- to CO32- type by alkaline washing with 1.0 mol/l NaOH solution; this washing was repeated thrice. Thereafter, the effects of organic phase composition, phase ratio, extraction time, and temperature on the extraction and separation of arsenic were investigated. The results show that under the conditions of 30% CO32--type TOMAC + 15% sec-octanol + 55% sulfonated kerosene, VO/VA = 1/1, and 5 min extraction at room temperature, the single-stage extraction rate of AsIII is 85.2%. The AsIII concentration in raffinate can be reduced to less than 1.33 × 10−3 mol/l by four-stage countercurrent extraction, and the extraction rate of AsIII can exceed 98.4%.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Yuliang Li,Xiaojia Lu,Qi Zhu,Rong Huang,Jing Hu,Hongbin Yang,Yiliang Yao
The liquid-liquid equilibrium for five systems containing sodium carbonate + ethanol + 2-propanol + water (with different ethanol to 2-propanol mass ratios), sodium sulphate + ethanol + 2-propanol + water, sodium carbonate/sodium dihydrogen phosphate + ethanol + 1-butyl-3-methylimidazolium tetrafluoroborate + water were determined at T = 308.15 K and atmospheric pressure. The binodal curves were correlated by Merchuk equation and another empirical formula while tie-lines were satisfactorily reproduced by a two-parameter equation with two other expressions respectively developed by Othmer-Tobias and Bancroft. Numerous factors were introduced to explore their impacts on the salting-out abilities of the quaternary aqueous two-phase systems. Results have shown that the anion species, ratio of organic components and system types significantly affected the phase behavior of investigated systems. Besides, the optimal system in this work was selected to extract vitamin B6 under laboratory conditions and the influences of pH value, temperature and extraction time on extraction process were investigated as well.
研究领域:
化学工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Hui Cao,Denghui Meng,Xutao Liu,Tai Ye,Min Yuan,Jinsong Yu,Xiuxiu Wu,Yan Li,Fengqin Yin,Fei Xu
A novel dual-frequency ultrasound-assisted enzymatic digestion (DUED) technique was used to extract Pb(II) from certified reference materials (CRMs) of wheat flour. Following this, the interactions of Pb(II) with wheat proteins were investigated to provide evidence for the selection of enzyme species. The results showed that the simultaneous use of α-amylase and flavourzyme resulted in the recovery of 97.9% of Pb(II) in 6 min under a 40 kHz ultrasonic bath combined with a 20 kHz ultrasonic probe. The exopeptidase activity of the flavourzyme was found to be the main contributor to the extraction of Pb(II) from the CRMs. Additionally, the proposed method exhibited a low detection limit (8.2 ng/g) and high recoveries of real samples (93.4%-112.2%) with RSD less than 7.33%. Furthermore, the oxygen-containing groups of wheat proteins, the nitrogen-containing groups of albumins and globulins, and the sulfur-containing groups of gliadins and glutenins were found to offer coordination sites for Pb(II).
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）