FIBERS AND POLYMERS
·
2019
·Vol. 20
·期 11
·2376-2382
·
IF 1.439
Wu Jinsong,Zhao Hongjuan,Wang Mingyue,Zhi Weiru,Xiong Xiaoqing,Zheng Laijiu
The supercritical carbon dioxide (SC-CO 2 ) dyeing technology is a green dyeing technology, and the usage of natural dye makes SC-CO 2 dyeing technology safer and more environment-friendly. Nevertheless, after using natural dye in SC-CO 2 dyeing, the color depth and fastness of dyed natural fabric are poor. In this study, alkyl and hydroxyalkyl groups were grafted onto alizarin, which is a natural dye, to elevate the color depths and fastness of alizarin-derivative-dyed natural fabric. The results demonstrate that the color depths of alkyl-alizarin-dyed and hydroxyalkyl-alizarin-dyed natural fabrics were increased. This has to do with the increase in the solubilities of alkyl alizarin and hydroxyalkyl alizarin in SC-CO 2 . The hydroxybutyl-alizarin-dyed wool displayed the best color depth (K/S value: 6.44). And the hydroxyalkyl-alizarin-dyed natural fabric showed good washing fastness and rubbing fastness (about 4–5 level), because that hydroxyalkyl alizarin could be linked by a covalent bond to the natural fabric.
研究领域:
纺织科学
·
绿色化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 82
·66704-66710
·
IF 3.84
Lu-Jie Liu,Hong-Mei Guo,Bo Xue,Hui Lou,Min Chen
Biomass is expected to be a substitute for traditional fossil fuels because it is renewable and environmentally friendly. Bio-oil, as an important utilization of biomass, has a complex composition. Accordingly, it remains a great challenge for oxygenated compounds in bio-oil to be upgraded, especially for furfural. In this research, a highly active catalyst with 1 wt% palladium supported on activated carbon (Pd/AC) was prepared by impregnating Pd species on modified activated carbon, which was applied to furfural catalytic hydrogenation in super critical carbon dioxide (scCO2). The conversion rate (79%) was higher than that obtained in toluene as solvent (60%). A selectivity of furfuralcohol and tetrahydrofurfuryl alcohol of up to 100% was achieved in scCO2 conditions with no byproducts obtained. In contrast, the total selectivity was only 60% using ethanol as solvent. Meanwhile, the reaction conditions in the scCO2 including hydrogen pressure and catalyst amount have been investigated. The Pd/AC catalysts were characterized by XRD, SEM, IR and BET techniques. A green solvent, and high activity and selectivity present real advantages of this method over other methods.
研究领域:
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2013
·
IF 2.379
Di Duan,Baogen Su,Huabin Xing,Yun Su,Yiwen Yang,Qilong Ren
The solubilities of newly synthesized chelating agents, i.e. diethylene glycol bis (2,4,4-trimethyl-1-pentyl) dimethyl diphosphate (EG2TP), diethylene glycol bis (3,5,5-trimethyl-1-hexyl) dimethyl diphosphate (EG2TH), and diethylene glycol dioctyl dimethyl diphosphate (EG2Oct) in supercritical carbon dioxide (scCO 2 ) were determined at temperatures ranging from 313 to 333 K and pressures ranging from 9 to 17 MPa. Solubility increases in the order of EG2Oct (MW = 518.56) < EG2TH (MW = 546.61) < EG2TP (MW = 518.56). Solubility parameter and connectivity index of these compounds were calculated and discussed, which indicated that branched side chains of the ligands play an important part in increasing solubility in scCO 2 . A semi empirical model proposed by Bartle was used to correlate the experimental data and AARD values were calculated to be 5.2%, 4.4%, and 3.4% for EG2TP, EG2TH, and EG2Oct, respectively. Also the quantum chemical calculation and COSMO-RS method were introduced to estimate the structure effect on the interaction with CO 2 by computing the charge density distribution on the surface of these compounds. As expected, better masking effect of the side chains result in higher solubility.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Feng Yanhong,Luo Hongwei,Yin Xiaochun,Lei Bo
The development of an environmentally effective strategy for separating chitin from shrimp shells was carried out in this study. Steam explosion (SE) was first performed to increase the specific surface area of shrimp shells, which led to an improvement in the demineralization efficiency with supercritical carbon dioxide/ water and the deproteinization efficiency with high-temperature water. Comparing to shrimp shells without SE, the demineralization rate and deproteinization rate after SE increased by 12.23 % and 13.04 % respectively, and ultimately achieved high rates of demineralization and deproteinization (>95 %). The minimum selling price of chitin was estimated to be 303.95 CNY/kg by this strategy, which decreased by 35.06 % according to technical-economic analysis. Based on life cycle assessment, the carbon emissions per kilogram of processed shrimp shells were decreased by 38.74 %. This work provides a new perspective on the economic and green preparation of chitin and demonstrates considerable potential for large-scale development and application.
研究领域:
生物化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Current Research in Food Science
·
2024
·
IF 6.2
Ouyang Zheng,Xiaojie Cao,Yanqing Teng,Qinxiu Sun,Shucheng Liu
The effects of dense phase carbon dioxide (DPCD) pressure and temperature on the activity of cathepsin L in white shrimp ( Litopenaeus vannamei ) were studied. Meanwhile the effects of DPCD and heat treatment on the activity of cathepsin L were compared. The results of inactivation kinetics showed that under the same treatment temperature, the inactivation effect of DPCD on cathepsin L increased gradually with the increase of pressure and time. The effect of DPCD pressure on the activity of cathepsin L accorded with the first-order kinetic model. Under the same treatment pressure, with the increase of temperature, the inactivation effect of cathepsin L was significant at the initial stage of DPCD treatment (rapid inactivation period), and decreased with the extension of time (stable inactivation period). The effect of DPCD treatment temperature on cathepsin L activity accorded with the first-order kinetic model at 35 °C, and two-stage kinetic model at 40–60 °C. The difference of relative enzyme activity between the two treatments showed that the dependence of DPCD on temperature was greater than that of heat. E a, F and E a, S of DPCD were higher than that of heat, which indicated that cathepsin L was more easily inactivated under DPCD treatment.
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
CELLULOSE
·
2018
·Vol. 25
·期 11
·6771-6792
·
IF 3.809
Shi Wei,Liu Shi-Qi,Sun Jian-Ping,Long Jia-Jie
Abstract A novel and environmentally-friendly strategy for integrated bio-treatment (namely the biodesizing and bioscouring) of grey cotton in one-step to degrade and/or remove impurities was constructed on the basis of catalytic reactions from mixed enzymes, by employing reverse microemulsion in supercritical carbon dioxide fluid (SCF-CO 2 ) media as an alternative to heavily polluting wet-chemical processes. Moreover, a subsequent supercritical washing procedure was also involved. Then the proposed strategy was further explored and characterized by the observation of the formation of reverse microemulsion, impurity removal efficiency and wickability of the treated substrate, the results of static water contact angle measurements, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis. The results demonstrate that an efficient degradation and/or removal of various impurities could be achieved by the proposed strategy from grey cotton with enhanced properties. A successful formation of microemulsion for transfer of enzymes into supercritical carbon dioxide was observed with the presence of an emulsifying agent of sodium bis (2-ethylhexyl) sulfosuccinate (AOT) and the auxiliary of ethanol. The efficiency of impurity removal could also be improved at an appropriate system temperature and composite enzyme dosage, as well as by a subsequent washing in SCF-CO 2 media. Furthermore, the results of the static water contact angle measurement, XPS spectra and SEM analysis further confirmed the feasibility, validation and reliability of the constructed strategy. Additionally, an integrated removal mechanism was also proposed for impurity degradation and/or removal from grey cotton, with mixed enzymes transferred by reverse microemulsion in supercritical carbon dioxide media. Graphical abstract
研究领域:
纺织科学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2017
·
IF 2.991
Biao-Qi Chen,Ranjith Kumar Kankala,Shi-Bin Wang,Ai-Zheng Chen
Despite the significant advancements in the pharmaceutical manufacturing process, the aqueous solubility of most of the potent drugs has remained as an unresolved problem during the formulation development and drug delivery processes. To address this critical issue, we modified the continuous-rapid expansion of supercritical solution (RESS-C) process, which is incessant, stable and well-regulated. Initially, the solubility of lonidamine (LND) in supercritical carbon dioxide (SC-CO 2 ) was tested using a static analytical method at altered critical conditions ( T : 308.15-328.15 K, P : 10.0-30.0 MPa). Under optimized conditions (LND conc.- 0.5% (w/v), flow rate- 1.0 mL/min, T - 328.15 K, P - 20.0 MPa and CO 2 flow rate- 30.0 g/min), the modified RESS-C process resulted in nano-sized spheres with a smooth surface and a narrow particle size distribution. Further, the crystal properties of the samples and their molecular interactions were elucidated. The altered physical state of RESS-C processed LND from crystalline to amorphous resulted in the solubility improvement and also enhanced the in vitro antiproliferative effects compared to the unprocessed LND, demonstrating the potential of the modified RESS-C process in improving the bioavailability of poorly water-soluble drugs.
研究领域:
药剂学
·
制药工程
·
药物递送
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Hai-Qin Xiao,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Ya-Fang Qi,Sheng-Jie Yuan,Li-Tao Han,Zhi Zheng,Si-Xin Wu
Se-rich selenization offers remarkable benefits for grain growth of Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber layers , which is critical for solar cells fabrication. However, low-activity selenium often forms Se-clusters and trapped in CZTSSe absorber layers. These trapped Se-clusters increase carrier recombination in CZTSSe absorber layers, thus decreasing efficiency of CZTSSe solar cells. Herein, supercritical carbon dioxide (SCCO 2 ) treatment was demonstrated to regulate selenium composition of CZTSSe absorber layers for solar cells efficiency improvement. Compared with untreated CZTSSe absorber layers, selenium composition of CZTSSe absorber layers were significantly reduced by SCCO 2 treatment. The open circuit voltage ( V OC ) and fill factor (FF) of CZTSSe solar cells improved pronouncedly due to carrier recombination reduction and carrier transport enhancement. As a consequence, the power conversion efficiency (PCE) was increased from 9.26 % (ref device) to 11.43 % (SCCO 2 device). This unique SCCO 2 treatment may offer new ideas for other selenization-based optoelectronic devices performance improvement.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 11
·1-18
·
IF 2.8
Li Xin,Zhan Shiping
Poly (L-lactic acid) (PLLA) is a bio-based biodegradable polymer with minimal immunogenicity, non-toxicity and excellent mechanical properties and has widely used in medical, pharmaceutical, food packaging and other fields. However, linear PLLA has the characteristics of high melting point, strong crystallinity, weak flowability and poor thermal stability, which cannot meet the requirements of various industrial processes and novel pharmaceutical formulations. With its low viscosity, controlled degradation cycle, and excellent melt flowability, star-shaped PLLA can be used in the fields of biocomposites, biomedical devices, drug delivery, and intelligent packaging. Presently, metal catalysts and organic solvents are frequently used in PLLA synthesis industries, and both residues continue to pose a safety risks. In existing studies, the performance of bioenzymes as optimal green catalysts in organic solvents is not satisfactory, and they are predominantly used to synthesise oligomers with low yields and lengthy reaction times. In this study, a four-armed star-shaped poly (L-lactic acid) (4s-PLLA) with a porous structure favourable for drug loading was synthesised using supercritical carbon dioxide (Sc-CO 2 ) as a solvent, lipase as a catalyst, and erythritol as a nucleus. Using Sc-CO 2 as a solvent the reaction activity and stability of the enzyme were increased so that the reaction yield could reach 83% and the reaction time was only 24 h, which provided a possibility for the practical application of the enzymes catalyze green process. Both the random copolymerization product four-armed star-shaped poly(L-lactic-glycolic acid) (4s-PLGA) and the block copolymerization product four-armed star-shaped poly (L-lactic-glycolic acid) (4s-PLLA-PGA) were subsequently synthesized by copolymerization modification, and their porous structures retained and hydrophilicity were enhanced. The response surface analyses were performed about the reaction time, reaction temperature and yield of synthetic reactions by using Design-Expert 12 software and the prediction equations were generated.
研究领域:
生物材料学
·
绿色化学
·
医药工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 17
·10541-10551
·
IF 4.21
Wang Mingyue,Liu Mao,Zhao Hongjuan,Xiong Xiaoqing,Zheng Laijiu
Abstract Modified curcumin, which has the advantages of low toxicity, high solubility, and little color change after modification, is very suitable for nonaqueous supercritical carbon dioxide cotton dyeing. However, the existing curcumin modification technology focuses on improving its solubility. Modified curcumin is directly adsorbed onto cotton fabrics, and the main interaction forces are van der Waals forces, which causes the poor fastness of modified curcumin to dyed cotton fabrics. In this study, reactive groups (hydroxyalkyls) were introduced into curcumin to enhance its fastness to cotton fabrics. The results showed that, similar to alkyl groups, hydroxyalkyl groups can enhance the color depth of dyed cotton fabrics by elevating the solubility of modified curcumin in supercritical carbon dioxide. The higher the solubility of modified curcumin in supercritical carbon dioxide was, the higher the K/S value of the dyed cotton fabric. Furthermore, the hydroxyl groups on the modified curcumin could form ether bonds with the hydroxyl groups on cotton fabrics. Therefore, the washing and rubbing fastness of hydroxyalkyl-curcumin-dyed cotton fabric was better than that of alkyl-curcumin-dyed cotton fabric. Graphic abstract
研究领域:
染料化学
·
纺织科学
·
材料科学
✓ 已验证
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Senlin Li,Yifan Zheng,Zhihao Zhang,Shengao Xu,Yuan Pu,Dan Wang
Supercritical carbon dioxide was used as the solvent for manufacturing of ibuprofen loaded gelatine sponges with high loading capacity and fast release performance toward healthcare materials in the treatment of postoperative dental pain. The solubility of ibuprofen in supercritical CO 2 was first determined at 313 K under different pressure conditions. The micronisation of ibuprofen drugs were successfully adsorbed onto the surface of network pore system of gelatine sponges via supercritical CO₂ processing. The loading capacity of ibuprofen in gelatine sponges obtained by using supercritical CO₂ as the solvent can be up to 19.86 wt%, which was double that of the sample prepared by direct soaking in ethanol. The dissolution of ibuprofen was determined and higher instantaneous dissolution rate was observed for the ibuprofen loaded gelatine sponges synthesized by supercritical CO₂ processing.
研究领域:
制药工程
·
材料科学
·
药物递送
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Chenglong Wen,Shanlei Han,Jundong Xu,Yu Fan
The article proposes a novel and eco-friendly method for synthesizing SAPO-11 in ethylene glycol (EG) and supercritical carbon dioxide (ScCO 2 ). The method incorporates ScCO 2 into EG to decrease the solubility of SAPO-11 precursors in EG and thereby forms a highly supersaturated solution of SAPO-11 precursors. The as-synthesized SAPO-11 possesses smaller particles, a larger external surface area, and a larger number of acid sites than the SAPO-11 synthesized in EG and the SAPO-11 synthesized in water and ScCO 2 , respectively. These advantages of the as-synthesized SAPO-11 endow the corresponding catalyst with superior dibranched isomer selectivity and low cracking selectivity during 1-octene hydro isomerization.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）