CELLULOSE
·
2020
·Vol. 27
·期 12
·7283-7296
·
IF 4.21
Lu Ruiyang,Yu Yucong,Adkhamjon Gafurov,Gong Wenli,Sun Xiaoqing,Liu Lin
Abstract In this paper, a facile and efficient approach to robust and durable superhydrophobic cotton fabric was presented via in situ CuO deposition and stearic acid (STA) coating. The combined effects of both rough structure and low surface energy endowed cotton fabric (Cot) with superhydrophobicity, water repellency, and self-cleaning property. Moreover, the as-prepared fabric (Cot–CuO–STA) could keep its robust superhydrophobicity under harsh environmental conditions of acidic, alkaline and salt solutions, high temperature, mechanical abrasion and washing. Importantly, the obtained Cot–CuO–STA with WCA of 156.5° had great potential in oil/water separation with high separation efficiency of up to 98.7% for various oils (dichloromethane, trichloromethane, soybean oil, and n-heptane). Further, fascinating permeate flux (more than 1800 L.m −2 .h −1 ) and remarkable recyclability made Cot–CuO–STA a promising application in oil-contaminated water treatment and marine spilt oil cleanup. Graphic abstract Robust and durable superhydrophobic cotton fabric was fabricated for oil/water separation via a facile and efficient route. The resultant fabric exhibited remarkable separation efficiency for different kinds of oils, fascinating permeate flux, and excellent recyclability.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10621-10627
·
IF 3.288
Xue Xiong,Meiling Qi
This work presents a novel column fabrication approach for capillary gas chromatography (CGC) through the condensation reaction of a hydroxyl-terminated polymer with a cross-linker inside a capillary column. In this work, polypropylene glycol (PPG 4000) and tris[3-(trimethoxysilyl)propyl]isocyanurate (ICS) were employed to fabricate the PPG-gel capillary column for GC analyses. Inside the column, a 3D cross-linked organogel network forms on the capillary inner surface by condensation of PPG 4000 with ICS under the given mild conditions. As a result, the PPG-gel column exhibited moderate polarity and showed distinctly advantageous resolving performance and inertness for carboxylic acids over the PPG column by the conventional static coating method. Also, it achieved high-resolution separations of the isomer mixtures of alkanes, alkylbenzenes and halobenzenes. Moreover, the PPG-gel column exhibited dramatically improved solvent stability because of its cross-linked organogel network. The organogel column displayed excellent column repeatability and reproducibility with the RSD% values in the range of 0.01–0.04% for run-to-run, 0.71–0.84% for day-to-day and 2.4–3.1% for column-to-column. The proposed organogel approach is facile and applicable to other analogous materials and has a promising future for wide applications.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Yuchen Ya,Xiaokang Nie,Weiwei Han,Longkai Xiang,Mingyan Gu,Huaqiang Chu
The effects of 2, 5-dimethylfuran (DMF)/ethanol addition on the atomized combustion soot formation characteristics of n-heptane/iso-octane coflow diffusion flames are systemically studied. The changes of soot particles and deposition morphology at different heights in the flame of reference fuel with 15% ethanol (E15) and 15% DMF (DMF15) are analyzed. Results show that the addition of oxygenated fuels can increase the flame heights and decrease the brightness. With the addition of 15% ethanol and DMF, the flame heights are increased by 11.29% and 19.35% respectively, and the brightness of the edge region of the middle section of DMF15 flame is enhanced. At the nozzle, the average temperature of E15 flame increases by 80 K. The high temperature region of E15 flame enlarged and the average temperature difference of different heights is higher than 50 K. As for DMF15, the high temperature region of flame is constant, and the average temperature difference between various heights is smaller than 35 K. For three fuels, the size of the sediment particles formed at the low height above burner (HAB = 20 mm) is large, and the obvious pore structure can be seen at HAB = 60 mm. The addition of oxygenated fuels makes the pore structure distribution regular and the porosity decreases, and DMF15 (porosity = 0.2670) has larger pore structure than E15 (porosity = 0.1557). The oxygenated fuel can inhibit the formation of soot precursors and the agglomeration of soot particles, but the increase of particle size in the middle region of flame is promoted because of the increase of flame height and residence time of soot particles. As a result, the soot particle size of oxygenated fuel is decreased greatly in the oxidation stage, and the soot particle size of DMF15 (40.4%) is decreased more than that of E15 (37.1%). The effect of ethanol and DMF addition on the activation energy of low position soot is not obvious, which is about 130 kJ/mol. In the middle position of the flame, the activation energy of E15 is the highest (159.32 kJ/mol), and the activation energy of DMF15 is the smallest (148 kJ/mol). At the high position, E15 (212.07 kJ/mol) and DMF15 (226.73 kJ/mol) are less than that of DE0 (235.03 kJ/mol) respectively, indicating that the activation energy of the mature soot reduces, which is beneficial to the oxidative removal. Ethanol can dilute the fuel and increase the oxygen concentration in the mixture, while DMF can delay the ignition and prolong the residence time of soot and increase the content of disordered carbon in mature soot particles.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Jian Kuang,Jian Gao,Shaoxia Xie,Qunfang Lei,Wenjun Fang,Hujun Xie,Xiaoxing Lu
Protection of environment-sensitive bioactive component is an important issue in biological and pharmaceutical applications. The aim of this study is to provide an alternative for the solubility enhancement and the controlled release of curcumin by encapsulation with the microemulsion formed with Gemini surfactant. Pseudo-ternary phase diagrams for the surfactant/cosurfactant/oil/water (S/C/O/W) systems are obtained and the phase behaviors are systematically investigated. Less amount of water can be solubilized in the microemulsion containing alcohol with a longer carbon chain or surfactant with a longer spacer. A lower mass ratio of S/C or a higher temperature also leads to a smaller microemulsion area. As a representative, the oil-in-water microemulsion of the 14-4-14/1-propanol/ n -heptane/water system is applied to encapsulate curcumin. High drug loading capacity and encapsulation efficiency are achieved higher than 7 mg·g −1 and 99%, respectively. Moreover, the in vitro release data are adequately described by the first-order reaction rate equation at both fast and mild release stages. A higher content of oil causes a slower release and a lower stable concentration for the packaged curcumin. The free radical scavenging activity is somewhat reduced when compared with that of free curcumin in ethanol due to gradual release.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Chengjie Wang,Tian Lan,Xiangyang Liu,Ying Zhang,Maogang He
Critical properties which are the basis for the calculation of other thermophysical properties, are required to evaluate the fuel performance during the process of fuel design. A predictive model, which does not require critical temperature ( T c ) and critical pressure ( p c ) of each component, is further developed for T c and p c for the fuel blends containing esters based on the new measured data for the mixtures of biodiesel surrogate methyl butanoate, alcohols and n-alkanes (methyl butanoate + n-alkanes (C = 6, 7, 8), methyl butanoate + n-alcohols (C = 3, 4), methyl butanoate + n-hexane + n-propanol). The accuracy of this modified model is proved by the comparison with Li model, Chueh–Prausnitz model and He–Liu model. All the critical curves of the mixtures experimentally studied in this work show good linearity except the mixture of methyl butanoate + n-alkanes due to different characteristics between two components. The performances of Redlich–Kister model, PR–WS model, Cibulka model and Singh–Sharma model in correlating the measured data are also verified.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Wenyang Fan,Houchun Yan,Xin Huang,Zhaohui Liao,Qingsong Li,Zhanhua Ma
The extraction process as a kind of energy-saving and environmental protection technology can be used to separate phenols from low-temperature coal tar. The liquid–liquid equilibrium (LLE) data regarding ternary systems n-heptane + phenols + furfural were determined experimentally at 303.2, 323.2, and 343.2 K under the atmospheric pressure condition, where phenols refer to phenol, p-cresol, and 2,6-xylenol. The solvent extraction capacity was assessed by the solute distribution coefficient and selectivity. Othmer–Tobias and Bachman equations were utilized to validate the consistency of the measured data, which the linear correlation (R2) ≥ 0.99. Experimental LLE data were correlated utilizing the NRTL and UNIQUAC thermodynamic models with all of the RMSD and AARD values below 0.01, meaning that each ternary system is satisfactorily in agreement at temperatures studied and the NRTL model gives better agreement than the UNIQUAC model for ternary systems.
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Bo Liang,Kai Shi,Yanfang Niu,Zhengchun Liu,Jianlong Zheng
Styrene-butadiene-styrene (SBS)-modified asphalt plays an integral role in asphalt pavements. To facilitate the understanding of the correlations between the physical and chemical properties of asphalt cement and SBS , a method for the direct quantitative determination of the SBS modification mechanism via potentiometric titration is proposed. This method will theoretically guide the processing design of SBS-modified asphalts. Potentiometric titration is applied to investigate the unsaturation of SBS-mixed, SBS-modified, and SBS/sulfur-modified asphalts with different SBS dosages ranging from 0% to 10%. The unsaturation of SBS-mixed asphalt exhibits a good linear increase with an increase in SBS dosage. A noticeable loss of SBS unsaturation occurs in SBS- and SBS/sulfur-modified asphalts after undergoing complete modification. In addition, unsaturation presents an evident inflection point at approximately 5 wt% SBS with an increase in SBS dosage. This finding indicates SBS changing from a dispersed phase to a continuous phase in the modified asphalts. Remarkably, the addition of sulfur can accelerate the emergence of an inflection point. Results corroborate that various types of virgin asphalt exhibit different inflection points. SBS/sulfur-modified asphalt demonstrates stronger chemical cross-linking than SBS-modified asphalt. These findings are further confirmed via fluorescence imaging, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Potentiometric titration potentially provides a direct quantitative method for probing the modification mechanism of and designing customized processing for SBS-modified asphalts.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Yucheng Li,Jing Liu,Jing He,Luying Wang,Jiandu Lei
The effect of titanium as a promoter for the nickel-cobalt/silica-titania (NiCo/Si-Ti) catalyst in the hydrogenation of phenol was comparatively studied. In the phenol hydrogenation under mild reaction conditions (1 MPa H 2 pressure and 100 °C), the Ti-promoter induces the formation of the Co δ− −O V −Ti 3+ active sites and enhances the hydrogenation activity of the NiCo/Si catalyst to convert phenol to cyclohexanol. The catalytic hydrogenation with the optimal composition of the NiCo/Si-1.0Ti (Si:Ti ratio of 8.5:1) catalyst was completed within 1 h (conversion 98.2 % and selectivity >99 %), which was more efficiently than that with other Ti-doped catalysts and NiCo/Si as baseline, indicating a strong positive synergistic effect between the metal (Ni-Co) and support (Ti-Si) components of the catalyst in this reaction. Additionally, the kinetics, pathway and catalytic mechanism of the hydrogenation of phenol are also examined. Furthermore, the NiCo/Si-1.0Ti catalysts also showed a good performance at reducing the unstable oxygenated compounds in the bio-oil.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Anyao Ma,Guanglin Wang,Zhenglong Yang,Liangjiu Bai,Hou Chen,Wenxiang Wang,Huawei Yang,Donglei Wei,Lixia Yang
Janus nanomaterials can be highlighted to design a series of smart materials with the remarkable characteristic of two different properties or constituents. In this manuscript, functional Janus graphene oxide-type (GO-type) nanomaterials were fabricated by Pickering emulsion template and successfully applied to develop of dual self-healing nanocomposite hydrogels. Asymmetric functionalization of Janus nanosheets were achieved in typical oil-in-water Pickering emulsion by atom transfer radical polymerization (ATRP) and mussel-inspired chemistry. Poly(2-(acryloyloxy)ethyl ferrocenecarboxylate) (PMAEFc) and polydopamine (PDA) were unsymmetrically grafted on the two sides of GO (Janus GO-PMAEF/PDA (JGNs)), which successfully applied in self-healing nanocomposite hydrogels. The collaborative effect of metal-ligand coordination and host-guest interaction make the dual self-healing hydrogels have excellent self-healing properties (self-healing efficiency can reach to 93.4% within 1 h) and mechanical strength (tensile strength of 0.94 MPa and strain of 508.5%). Therefore, these chemical asymmetric JGNs have outstandingly application prospect in the development of smart materials.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Zidong Zhang,Yuming Tu,Hui Yu,Weidong Liu,Zhiyong Zhou,Zhongqi Ren
Extraction is a common approach to separating aromatics and alkanes, but solvent recovery remains an issue. The polarity, hydrophobic/hydrophilic balance, and other properties of switchable solvents can be reversibly changed in the presence of various triggers, and taking advantage of this property can greatly simplify the process of solvent recovery. In this work, quaternation and anion exchange were used to prepare several switchable solvents by introducing OH– ions to derivatives of the amidine compound 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The resulting compounds exhibited reversible switching in response to exposure to CO2. Using toluene/n-heptane as a model hydrocarbon mixture, a reversible phase change extraction process was established. Among the four switchable solvents prepared, [C2DBU]OH showed the highest selectivity value and so was used to investigate the effect of various parameters on hydrocarbon separation. The extraction process was found to rapidly reach equilibrium when a two-phase system was generated by bubbling CO2 through the extraction mixture. Increasing the proportion of the solvent increased the selectivity for toluene, while a 1:1 ratio between the solvent and the toluene/n-heptane mixture enhanced the extraction. Increasing the initial toluene concentration reduced the selectivity for toluene, with a value of 5.97 at a toluene concentration of 20%. The switchable solvent recovered its initial state when heated at 60 °C for 1 h. Upon being reused after removal of CO2, the solvent exhibited poor separation characteristics, although the selectivity coefficient remained constant at approximately 3.1 during 10 regenerations. Finally, the mechanism of the switchable solvent effect and modeling of experimental data were investigated.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 44
·25641-25649
·
IF 10.733
Jinqiu Yuan,Mengyuan Wu,Hong Wu,Yanan Liu,Xinda You,Runnan Zhang,Yanlei Su,Hao Yang,Jianliang Shen,Zhongyi Jiang
The demand for thin-film composite nanofiltration membranes bearing unprecedented water permeance and desirable salt rejection is ever increasing in desalination. Conventional interfacial polymerization usually generates a thick (∼100 nm) skin layer on hydrophobic substrate having low-porosity, leading to limited water permeance. Herein, we engineered a highly porous and superhydrophilic composite substrate to modulate the interfacial polymerization and generate an ultrathin polyamide skin layer, even below 10 nm. The composite substrate was constructed by depositing covalent organic framework nanosheets (CONs) on a microfiltration membrane via vacuum-assistant assembly. Owing to the highly porous structure and superhydrophilic nature of CONs, the composite substrate favored a high storage capacity and uniform distribution of the amine monomers. We manipulated the monomer storage capacity of the substrate by varying the loading content of CONs and demonstrated that higher amino monomer concentration could accelerate the self-sealing and self-termination of the interfacial polymerization, thus generating a thinner skin layer from ∼70 nm to sub-10 nm. Moreover, the highly porous structure of CONs imparted little additional water transport resistance. The sub-10 nm film composite membrane exhibited a superior water permeance of 535.5 L m−2 h−1 MPa−1 with a high rejection of 94.3% for Na2SO4, which was about 2–8 times higher than that of state-of-the-art nanofiltration membranes with comparable rejection.
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 4
·807-816
·
IF 2.162
Chun-Hui Du,Xin-Yi Zhang,Chun-Jin Wu
Chitosan (CS) with good hydrophilicity and charged property was used to modify graphene oxide (GO), the obtained GO-CS was used as a novel modifier to fabricate thin film composite forward osmosis (FO) membranes. The results revealed that the amino groups on CS reacted with carboxyl groups on GO, and the lamellar structure of the GO nanosheets was peeled off by CS, resulting in the reducing of their thicknesses. The GO-CS improved the hydrophilicity of polyethersulfone (PES) substrate, and their contact angles decreased to 64° with the addition of GO-CS in the substrate. GO-CS also increased the porosity of the substrate and surface roughness of FO membrane, thereby optimizing the water flux and reverse salt flux of FO membrane. The average water flux of the FO membrane reached the optimal flux of 21.34 L/(m 2 h) when GO-CS addition was 0.5 wt%, and further addition of GO-CS to the substrate would decrease the water flux of FO membrane, and the reverse salt flux also decreased to the lowest value of 2.26 g/(m 2 h). However, the salt rejection of the membrane increased from 91.4% to 95.1% when GO-CS addition increased from 0.5 to 1.0 wt% under FO mode using 1 mol/L sodium chloride (NaCl) solution as draw solution (DS). In addition, high osmotic pressure favored water permeation, and at the same concentration of DS, magnesium chloride (MgCl 2 ) exhibited better properties than NaCl. These results all suggested that GO-CS was a good modifier to fabricate FO membrane, and MgCl 2 was a good DS candidate.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）