SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Xihai Zhang,Houfang Lu,Yingying Liu,Kejing Wu,Yingming Zhu,Binshen Wang,Bin Liang
Amidine-alcohol solution is an efficient absorbent for CO 2 capture with high CO 2 loading and low regeneration temperature compared with 30 wt% monoethanolamine (MEA) solution. However, the high viscosity restricts its further utilization in the industry. To decrease the viscosity of amidine-alcohol solutions during the absorption of CO 2 , different glycols including ethylene glycol , 1,3-propanediol, 1,2-propanediol, 1,3-butanediol and 1,4-butanediol were adopted in 1,5-diazabicyclo [4,3,0] non-5-ene ( DBN)-glycol solutions for CO 2 absorption. Both the absorption and desorption performances of those absorbents in the reaction with CO 2 were investigated including the viscosity and regeneration energy. The CO 2 loading can reach as high as 5.87 mol·kg −1 in DBN-1,3-propanediol solution, which is more than 3 times higher than that of 30 wt% MEA. Meanwhile, the viscosities for DBN-glycol-CO 2 systems can be decreased more than 95% compared with 1,8-diazabicyclo [5,4,0] undec-7-ene (DBU)-glycerol-CO 2 system. And DBN-ethylene glycol-CO 2 system shows the lowest viscosity among the five glycols systems. With DBN-1,4-butanediol solution as an absorbent, the regeneration energy can be decreased as low as 1.38 GJ·ton −1 CO 2 , which is 62% lower than that of 30 wt% MEA. After 9 cycles of absorption–desorption process, the CO 2 loading can be kept about 72% of the initial loading. Furthermore, the effect of water on absorption, desorption, viscosity and regeneration energy was also studied. It shows that the presence of water can increase the absorption rate and has little effect on the final CO 2 loading while decreasing the desorption rate. Meanwhile, the presence of water increases the regeneration energy of DBN-ethylene glycol-H 2 O-CO 2 system. However, considering the regeneration energy and viscosity, DBN-ethylene glycol solution is a promising solution for carbon capture and the regeneration energy can be decreased about 51 % even with 5 wt% water compared with 30 wt% MEA.
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DIAMOND AND RELATED MATERIALS
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2023
·
IF 4.1
Yihua Wang,Dongshan Li,Lunlin Shang,Fu Wang
In this work, the tribological properties of polyhydroxy molecule ascorbic acid as lubricating additive was investigated in graphite-like amorphous carbon film/bearing steel interface under polyethylene glycol lubrication . It was shown that ascorbic acid is an excellent friction modifier in graphite-like carbon film solid-liquid lubrication. The friction coefficient decreased from 0.12 of polyethylene glycol to around 0.02 (83.3 % reduction) of polyethylene glycol with >1 wt% ascorbic acid. Ascorbic acid had a little effect on the wear rate of graphite-like carbon film but promoted the steel ball wear. Ascorbic acid inhibited the oxidation of worn surface of steel ball and induced a more oxidized carbon film surface. The oxidized carbon surface and the increased contact area due to steel ball wear facilitated the adsorption of polyethylene glycol molecules at the sliding interface, which helped to establish fluid lubrication film and thereby resulted in ultra-low friction. This suggests that ascorbic acid is a promising candidate friction modifier to design novel ultra-low friction solid-liquid composite lubrication systems based on amorphous carbon films.
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CARBON
·
2023
·
IF 10.9
Yushi Yang,Xiaoqiang Fan,Zhaofan Yue,Minhao Zhu
Heterogeneous materials are an ideal platform for low friction, but most of the heterogeneous materials used in tribology field are artificially synthesized. Here, by matching the molybdenum disulfide (MoS 2 ) hybrid polyethylene glycol (PEG 200) and diamond-like carbon (DLC) film, the spontaneous formation of heterogeneous transfer film was realized during sliding. Thus, the anti-friction/wear ability of the synergetic system is improved from the reduction of friction coefficient and wear rate by 33.3% and 32.1% contrast to DLC film, severally. The characterization results show that the heterogeneous transfer film is formed by the rehybridization and recrystallization of MoS 2 and DLC combined with amorphous phase. The improvement on shearing capacity and bearing capacity of as-designed lubrication strategy better explicates the solid-liquid synergistic effect. The formation theory of heterojunction in solid-liquid composite lubrication is put forward, which has important reference value for the future solid-liquid composite lubrication technology.
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International Journal of Nanoscience
·
2023
·
IF 0.8
Yang Fu,Chaohui Ji,Zhiheng Ma,Defeng Xu,Hang Hu
In this work, we synthesized lactobionic acid-decorated diselenide-linked polyethylene glycol-doxorubicin conjugate (LA-PEG-SeSe-DOX) and prepared free DOX-loaded LA-PEG-SeSe-DOX(DOX@LA-PEG-SeSe-DOX) nanoparticles for hepatoma-targeted DOX delivery. LA-PEG-SeSe-DOX can self-assemble into nanoparticles in deionized water and DOX@LA-PEG-SeSe-DOX nanoparticles were prepared by loading free DOX into LA-PEG-Se-Se-DOX nanoparticles under sonication. DOX@LA-PEG-SeSe-DOX nanoparticles have high DOX loading content of 31.3%. The dynamic scattering analysis shows that DOX@LA-PEG-SeSe-DOX nanoparticles have small size (hydrodynamic diameter 4 5 . 6 9 ± 0 . 7 1 nm), near neutral zeta potential, and excellent colloidal stability. The in vitro drug release study indicates that DOX@LA-PEG-SeSe-DOX nanoparticles exhibit dual redox-responsive drug release characteristics. The cellular uptake study reveals that DOX@LA-PEG-SeSe-DOX nanoparticles can be taken up by hepatoma cells by asialoglycoprotein receptor (ASGPR)-mediated pathway. Finally, DOX@LA-PEG-SeSe-DOX nanoparticles exhibit enhanced cytotoxicity against HepG2 cells as compared to LA-PEG-SeSe-DOX nanoparticles, underlining the significance of releasing free DOX for effective tumor cell proliferation inhibition. This work provides a facile and effective strategy for targeted delivery of DOX to hepatoma cells.
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Catalysts
·
2023
·Vol. 13
·期 4
·673
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IF 3.9
Jinghu Zhu,Hui Liu,Xueyan Zhou,Zhijun Wang,Liancheng Bing,Dezhi Han,Guangjian Wang,Fang Wang
Cu-based catalysts, modified by gallium addition via the stepwise co-precipitation method, were studied for the liquid phase hydrogenation of hydroxypivalaldehyde (HPA) to neopentyl glycol (NPG). Through physico-chemical techniques, the effects of gallium introduction on the Cu trimetallic catalyst performance and the reaction mechanism of HPA hydrogenation were discussed. The characterization results showed that gallium introduction can influence the dispersion, reduction, and distribution of active Cu species, as well as their reactivity. Herein, the catalyst with 2 wt% gallium addition exhibited excellent catalytic performance with HPA conversion rate and NPG selectivity of 93.5% and 95.5%, at a reaction pressure of 3 MPa, temperature of 110 °C, hydrogen-aldehyde ratio (molar ratio) 10:1, and liquid space-time at a speed of 8.4 h−1. The good performance could be attributed to gallium doping tending to dynamically tune the interaction between the components, increasing Cu dispersion and the distributions of Cu+and Cu0species on the catalyst surfaces.Keywords:HPA hydrogenation;NPG synthesis;Cu-based catalyst;gallium modification;Cu+/Cu0
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APPLIED THERMAL ENGINEERING
·
2023
·
IF 6.4
Xiao Zhang,Liang Cai,Yu Liang,Zhenxi Ma,Xiaosong Zhang
The feasibility of combining novel halogenated hydrocarbon-based working pairs with low-pressure compression-assisted absorption refrigeration system (LCARS) was proved for the first time from the experimental perspective. An experimental prototype of the absorption-compression hybrid refrigeration system with a 1 kW cooling capacity was designed and tested to explore actual performances of selected R134a-DMETEG and performance improvements from compression in LCARS. At an evaporation temperature of approximately 5 °C, as the hot water inlet temperature and the solution flow rate change from 75 to 95 °C and 1.2–2.7 L/min, respectively, the coefficient of performance (COP) in the single-stage absorption refrigeration system (SSARS) varies from 0.211 to 0.412. At an increased evaporation temperature of approximately 10 °C, as the hot water inlet temperature and flow rate increase from 70 to 80 °C and 1.18–2.89 L/min, respectively, the COP in the SSARS varies from 0.238 to 0.552, while the COP in LCARS is improved and varies from 0.470 to 0.617. The LCARS increases the COP by a maximum of 91.04 % and can utilize a lower-grade heat source more efficiently due to its higher optimal COP at reduced hot water inlet temperatures. This study provided one feasible technical approach of combined use of R134a-DMETEG and LCARS to make up for the application limitations of traditional working pairs, contributing to application promotions of absorption systems, especially for the occasions with high requirement on safety and lightweight.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Xuechuan Wang,Ke Chen,Wei Li,Dongyan Hao,Peiying Guo
In this research, collagen hydrolysates with different average molecular weights ( Mn ¯ ) from leather collagen were chosen as raw materials. Five environmental-friendly sizing agents (SA) were prepared by cross-linking collagen hydrolysates with glycol diglycidyl ether (GDE) and further grafting them with butyl acrylate (BA) and styrene (St). Then the compound sizing agents (SGDESA-x, x = 1, 2, 3 and 4) were obtained by simple physical mixing of GDESA and starch. The surface sizing performance of GDESA and compound sizing agents were studied. The research result shows that both physical, mechanical properties and water resistance of the corrugated paper coated by GDESA were significantly improved when Mn ¯ of collagen hydrolysate was about 10,000, and its emulsion exhibited robust stability in long standing time. Furthermore, when the SGDESA-2 was used as a sizing agent, the coated corrugated paper exhibited strong water resistance, good physical and mechanical properties even after refolded for 20 times.
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PubMed
高影响因子
NANO
·
2019
·
IF 1.293
Yunong Zhou,Chao Hu,Weidong Zhang,Hong Chen,Gang Yu
The ability to control the shape, structure and faceting characteristics of bimetallic alloy nanocrystals (NCs) has been vital for designing a catalyst with excellent activity and durability in fuel cells. However, it has remained a significant challenge to synthesize platinum–copper (Pt–Cu) alloy NCs with controlled structure and exposed facets. Herein, Pt–Cu alloy NCs with different shapes, structures and facets were synthesized via a one-step direct chemical co-reduction method employing various glucose concentrations. The results showed that the prepared Pt–Cu alloy NCs exhibited very interesting facet-dependent electrocatalytic properties for ethylene glycol oxidation. In comparison with other prepared Pt–Cu alloy NCs and commercial Pt/C, Pt–Cu alloy NPs with (111)-dominant facets showed higher electrocatalytic activity and durability for ethylene glycol oxidation. Alloy NPs showing prominent electrocatalytic performance were attributed to the predominant (111) facets on NP surfaces serving as catalytic active sites, in addition to added Cu providing unique electronic and synergistic effects. The present work highlighted that these NPs with (111)-dominant facets were indeed promising candidates as electrocatalysts with excellent activity and superior durability.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Renjie Xu,Ting Han,Li Shen,Jianguo Zhao,Xiang’an Lu
Artesunate is dissolved in an aqueous solution of several organic solvents (methanol, ethanol, isopropanol, and PG), and the mole fraction of artesunate is determined by the static method. When the system reaches equilibrium, the range of system temperature is 278.15–318.15 K and the pressure environment is 101.1 kPa. When the temperature is constant, the equilibrium mole fraction of artesunate is proportional to the mass percentage of organic solvents, and the relationship between artesunate solubility and temperature is the same as before under certain conditions of the organic solvent component. When the external conditions are the same, artesunate is more likely to dissolve in the ethanol + water mixture than in several other systems. Besides, three classical mixed solvent thermodynamic equations—Jouyban–Acree model, van’t Hoff–Jouyban–Acree model, and Apelblat–Jouyban–Acree model—are applied to calculate the equilibrium mole fraction of artesunate. The maximum value of average relative deviations (ARD) obtained during the calculation is 0.83%. The experimentally measured data on artesunate has different general meanings for the expansion of application and production in the pharmaceutical field and provides theoretical data for its industrial production.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Chengdong Yang,Mi Zhou,Yi Lin,Chong Cheng,Fei Cheng,Wenlong Liu,Puxin Zhu
Super-tough poly ( l -lactide) (PLLA) without compromising its biodegradability and biocompatibility was fabricated by reactive blending with PLLA and maleic anhydride grafted starch (MS)/poly (ethylene glycol) diacrylate (PEGDA). PEGDA as reactive compatibilizer exhibits higher compatibilization efficiency and significant plasticization effect in PLLA matrix. Fourier transform infrared spectroscopy (FT-IR) confirmed that PEGDA monomer successfully located at the molecules of MS and some interesterification reactions occurred between PEGDA and PLLA. The ductility of PLLA materials were significantly improved, for example, the elongation of break increased to 298% at the optimum PLLA/MS/PEGDA content. Dynamic mechanical thermal analysis (DMTA) demonstrated the glass transition temperature of blends decreased with the contents of MS/PEGDA increasing. The differential scanning calorimeter (DSC) results revealed that cold crystallization temperature and melting temperature of blends were decreased with the augment of the contents of MS/PEGDA. Wide angle X-ray diffraction (WARD) and DSC certified that a high crystalline article was obtained through practical extrusion process, which could propagate shear yielding deformation to dissipate energy during tensile fracture. Scanning electron microscope (SEM) demonstrated that the blends with PEGDA did not exhibit a visible phase-separated morphology from cryogenic fractured surfaces compared with the blend without PEGDA.
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Nanomaterials
·
2019
·Vol. 9
·期 8
·1162
·
IF 4.034
Junbo He,Shuangshuang Huang,Xiaotao Sun,Lijuan Han,Chao Chang,Weinong Zhang,Qixin Zhong
To develop solid lipid nanoparticles (SLNs) with stable lipid matrix structures for the delivery of bioactive compounds, a new class of SLNs was studied using propylene glycol monopalmitate (PGMP) and glyceryl monostearate (GMS) mixtures and carvacrol as a model lipophilic antimicrobial. Stable SLNs were fabricated at PGMP:GMS mass ratios of 2:1 and 1:1, and the carvacrol loading was up to 30% of lipids with >98% encapsulation efficiency and absence of visual instability. Fluorescence spectra and release profiles indicated the carvacrol was successfully encapsulated and homogeneously distributed within the SLNs. SLNs fabricated with equal masses of PGMP and GMS had better stability of carvacrol during storage and higher sphericity than those with a ratio of 2:1 and were much more effective than free carvacrol againstEscherichia coliO157:H7 andStaphylococcus aureus. These findings demonstrated the potential applications of the studied SLNs in delivering lipophilic bioactive compounds in food and other products.Keywords:solid lipid nanoparticles;carvacrol;propylene glycol monopalmitate;synergistic antimicrobial activity
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HYDROMETALLURGY
·
2019
·
IF 3.465
Tingting Sun,Yajing Pan,Xiao Sun,Yongqiang Zhang
An environmentally friendly approach was reported for recovering vanadium (V) from aqueous media with aqueous two-phase system (ATPS) formed by poly (ethylene glycol) 2000 (PEG2000) and sodium sulfate with octadecyl amine ethoxylate ethers as extractants. The effect of aqueous pH, the type of extractants and phase-forming salts, vanadium concentration and extracting temperature on the extraction performance of vanadium was investigated. The researched results indicated that the extraction rate of vanadium has remarkable relationship with vanadium species in aqueous phase, and the selected extractants can extract efficiently vanadium from salt-rich to PEG200-rich phase. The initial and equilibrium pH in aqueous phase has no relationship with vanadium concentration, and there is no new covalent bond generation between polyvanadate anion and extractant in PEG 2000-rich phase by FTIR, which can be deduced that polyvanadate anion is extracted into PEG 2000-rich phase due to the electrostatic attraction interaction between protonated extractant and polyvanadate anion. Adding chloride and nitrate in aqueous two-phase system could remarkably decrease the extraction rate of vanadium, and then sulfate is in favor of extracting vanadium. The extraction rate of vanadium decreases with increasing temperature from 40.0 °C to 60.0 °C, which showed the phase transfer of vanadium from salt-rich phase to PEG2000-rich phase is exothermal, resulting from the difference of interaction energy among all compositions in aqueous two-phase system. The vanadium can be easily separated out from the solution containing Fe(III), Co(II), Ni(II), Cu(II), Zn (II), Al(III), Cr(III) and Mn(II) under the suitable conditions. The stripping rate and precipitation rate of vanadium can be easily achieved to 90% and 80%, respectively, in single stage stripping with ammonium carbonate solution as stripping agent and phase-forming salt.
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