查看更多>>摘要：ABSTR A C T In the present study, an eco-friendly, biodegradable, biocompatible, non-immunogenic, non-toxic polysaccharide, carboxymethyl cellulose (CMC), derivatived from renewable biomass cellulose, was used for designing and fabrication a folic acid modified pH and reduction dual-responsive carboxymethyl cellulose-based microcapsules (FA-PRCMCs). The curcumin (CUR)-loaded microcapsules (FA-PRCMCs@CUR) were prepared via a quick, efficient and environment-friendly sonochemical method, and were employed for the targeted delivery and pH/reduction dual-stimuli-responsive release of CUR. The excess CUR and ethyl acetate phases could be recycled and reused after preparation of FA-PRCMCs@CUR to avoid wasting resources and polluting the environment. The obtained FA-PRCMCs showed good biocompatibility and targeting in anti-tumor evaluation and endocytosis evaluation in vitro. FA-PRCMCs could effectively reduce the unnecessary damage to normal cells by chemotherapy drugs, and improve the utilization of chemotherapy drugs to reduce therapy costs. FA-PRCMCs could be used as smart targeted delivery vectors and have great clinical application potential. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Platinum catalysts supported on reduced graphene oxide (rGO) and an N-doped iron-based metal-organic framework (Fe-MOF) composite were prepared, and their activity was analyzed. The Pt-rGO/Fe-MOF composites were synthesized using hydrothermal and polyol processes in a Teflon-lined autoclave. Electroactivities were measured by cyclic voltammetry and chronoamperometry, and morphological analysis was performed using field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The composite material provides a small particle size, homogeneous dispersion, large adsorption area of platinum and it is used as an effective electron and proton transport path, so exhibits high electrochemical surface area and excellent methanol oxidation performance. The electrochemical properties of PtrGO/Fe-MOF are better than those of Pt-rGO or pristine Pt-(Fe-MOF), which demonstrates that rGO/FeMOF could be used as a promising catalyst support for direct methanol fuel cells (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Lee, GwanwonLee, Min EuiKim, Sung-SooJoh, Han-Ik...
10页
查看更多>>摘要：We demonstrate the conversion of disposable polypropylene (PP) masks into non-graphitizable carbon powders that can be applied as anode materials in sodium ion batteries. Sulfuric acid treatment and subsequent pyrolysis of the masks resulted in polyaromatic and carbon structures, respectively. Fourier transform infrared, Raman, and X-ray photoelectron spectroscopies revealed that a longer sulfuric acid treatment time results in a higher carbon yield (up to 50%), indicating that the infusible structures generated during sulfonation played a critical role in the development of the resulting carbon. In addition, we confirmed the detailed mechanism by NMR analysis, which indicated that sulfonation induced not only simple cross-linking but also polyaromatic hydrocarbons, contributing to distinct D and G bands in the Raman spectra. However, even heat-treatment at a high temperature of 2400 degrees C could not facilitate a graphitic structure, implying that PP is intrinsically non-graphitizable. Finally, we used mask-derived carbon as an anode material of sodium ion batteries. The prepared hard carbon anode showed a high reversible capacity of-340 mA h/g at a current rate of 0.01 A/g, and-53% of the capacity was maintained at 100 times higher current rate, suggesting the superior rate capability. In addition, the assembled full cell achieved a reversible capacity of-110 mA h/g with a high energy density of-352 Wh/kg, validating the feasibility of its application as an anode material of sodium ion batteries. The solid-to-solid conversion of PP-based masks to carbons could contribute to the upcycling technology as one of the potentially affordable waste plastic management techniques. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：GIS plays an irreplaceable role in the modern electrical system. However, partial discharge will inevitably occur under insulation defect conditions and may lead to serious insulation malfunction. The online monitoring method based on gas sensor is a feasible method to diagnose the severity of partial discharge in GIS. In this paper, metal oxide (TiO2, Fe2O3, NiO) cluster-modified single-layer graphene was proposed as a novel gas sensor to detect the characteristic components of SF6 decomposition products, SOF2 and SO2F2. Density functional theory calculations were carried out to study the gas adsorption and sensing mechanisms. The adsorption structures of gas molecules and the metal oxide cluster-modified single-layer graphene were built and optimized. Then, the most stable structure was selected to analyze the corresponding adsorption parameters. Calculation results showed that metal oxides decoration reduces the energy gap, improving the electrical conductivity and enhancing the adsorption activity of the graphene surface. According to DOS and CDD analyses, TiO2 modification obtained the best adsorption effect. Calculation results show that the metal-oxide-modified graphene sensor provides an effective method for effectively estimating the operating state of GIS by detecting SF6 decomposition products. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：With the rapid development of multiple functional nanozymes, the research on the unique characteristic, contributing to the enzyme-like activity, is essential for us to construct mimic enzymes with outstanding activity. Herein, 2D Co-V mixed metal oxides (MMOs) are prepared through Co-V layered double hydroxide (LDH) precursor. The single phase of Co-V LDHs is prepared by controlling the dosage of hexamethylenetetramine accurately in the coprecipitation system. After calcinated at 400 degrees C, the obtained Co-V MMOs, composed of Co3V2O8 and Co3O4, still inherite the microtopography of nanosheets from the precursor, which have superior surface properties to enhance the peroxidase/oxidase (POD/OXD)-like activity. 2D Co-V MMO nanosheets have excellent bactericidal properties in the presence of H2O2 as low as 1 mu M. The enhanced catalytic performances are attributed to unique hybrid nanosheets architecture and synergistic effect of two active components, ranking the hybrid nanostructure as a promising antibacterial material. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Ji, XingshuaiGao, GuanggangYang, PingXu, Baogang...
10页
查看更多>>摘要：The photocatalytic application of graphic carbon nitrate (g-C3N4) was limited due to the shortcomings of few exposed active sites and serious recombination rate of photo-generated carrier. In this paper, B-doped g-C3N4 nanosheets were synthesized by a two-step thermal polymerization method. Asprepared B-doped g-C3N4 nanosheets maintained the initial structure of g-C3N4. The composition analysis results indicated the successful introduction of B element into the g-C3N4 structure. Under visible light irradiation, as-prepared B-doped g-C3N4 nanosheets revealed excellent NO removal and hydrogen production performance, reaching 54% and 1639.29 mu mol/g/h, respectively. The superior photocatalytic performance was attributed to the ultrathin nanosheets obtained by thermal exfoliation, which have higher specific surface area and more active sites. The introduction of B enhanced the charge migration and inhibits the recombination of photogenerated carriers. The cyclic experiment indicated that the sample exhibited high stability. Enhanced photocatalytic mechanism from B doping was discussed. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Conversion of volatile organic compounds (VOCs) such as toluene and xylene to less harmful CO2 and H2O via catalytic oxidation over the metal oxide-impregnated activated carbon beads is a viable solution for controlling emission of the pollutants. The poly(furfuryl) alcohol (PFA) precursor-based carbon beads (similar to 0.8 mm) were synthesized via suspension polymerization. The metal-salt was in situ dispersed in the polymerization reaction mixture, and PFA-supported Ni was carbonized (C) and steam activated (A). Decomposition of toluene (similar to 2000 ppm) and xylene (similar to 400 ppm) at 500 degrees C over the supported metal oxide catalysts followed the trend: NiO > CoO > CuO > FeO. Approximately 8.5% (w/w) NiO loading showed the highest VOC decomposition rate. The present results revealed that NiO-PFA/C/A was stable under the experimental VOC oxidation reaction conditions, and is an efficient oxidation catalyst for controlling VOC emissions under a continuous operation. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：In this work, the uniform Cu2O submicron-cubes were facilely synthesized by liquid phase reduction method. Then, the Cu2O submicron-cubes were further oxidized into Cu2O-CuO heterojunction with tunable Cu2+/Cu+ ratios and CuO submicron-cubes by controlling the calcination temperature. The phase transition period during calcination was real-time monitored by the in situ XRD and in situ DRIFTS. The obtained materials were investigated as the catalysts of CO oxidation. The results revealed that the Cu2O-CuO heterojunction catalysts performed much higher catalytic activities than the Cu2O and CuO counterparts. Because the synergistic effect of the heterojunction (Cu2+/Cu+) could increase the surface oxygen vacancy concentration. Furthermore, it was also found that only the Cu2O-CuO heterojunction structure with the appropriate Cu2+/Cu+ ratio behaved the optimum catalytic activity. The kinetic studies indicated that the apparent activation energy of CO oxidation was greatly affected by the Cu2+/Cu+ ratio. Therefore, these Cu2O-CuO submicron-cubes with heterostructure were considered as the promising CO oxidation catalysts. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Kim, TaeseongPark, HyerimPark, Byung-HyunLiu, Chunli...
15页
查看更多>>摘要：This study aimed to improve the long-term durability of CdS catalysts by reducing the deterioration of catalytic activity caused by photocorrosion. An ultrathin 1T-WS2 2D nanosheet was introduced to enclose the CdS nanorods. The crystal defects in the wrapped CdS particles were reduced, and the WS2 sheet became thinner in the junction particle. The 2CdS@1WS(2) junction particle exhibited the slowest decay time of the photoluminescence curve, and the photocurrent density increased by more than 3.5-fold in the junction particle than the single CdS particle. Eventually, the optimized 2CdS@1WS(2) catalyst exhibited a high rate of H-2 production of approximate to 3935 mu mol g(-1) h(-1) under simulated solar light irradiation with a quantum efficiency of 50%. Although the recycling experiment was repeated over 10 times using the 2CdS@1WS(2) junction particle, the produced hydrogen amount did not decrease. This result is because CdS nanorods wrapped stably by the ultrathin WS2 nanosheets, which suppressed the photocorrosion of CdS, and furthermore, the 1T phase WS2 rapidly attracted photogenerated electrons from CdS, facilitating charge separation and inhibiting their recombination, thereby improving the catalyst activity. Finally, it was revealed that an effective Z-scheme charge transfer mechanism in the CdS@1T-WS2 junction particle follows during water splitting. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Jo, Chris HyunchulBhang, Suk HoYang, Hee SeokPark, Sihyeon...
13页
查看更多>>摘要：Achilles tendon regeneration using current tissue engineering techniques requires morphometrically mimetic tendon biomaterials to attain the required microstructural tendon tissue and to achieve the necessary mechanical properties. In this study, we used nano- (400 nm) and micro-groove (5000 nm) patterned polycaprolactone patches (PCL-400, PCL-5000), which offer adequate elastic modulus and biocompatibility. The PCL patches were fabricated via capillary force lithography and were surface modified with 3,4-dihydroxy-L-phenylalanine (DOPA) for increased hydrophilicity. We hypothesized that the resulting biologically surface-modified elastic groove patterned patches would enhance the cell behaviors in vitro and the rat Achilles tendon regeneration in vivo. The micro-groove patterned PCL patches with DOPA coating (DOPA-PCL-5000) exhibited excellent cell elongation, tenogenic differentiation and YAP expression of the mesenchymal stem cells in our in vitro study and these results were further confirmed by application to the rat Achilles tendon rupture model in our in vivo study. DOPA-PCL-5000 induced dramatic regeneration of rat Achilles tendon compared to the other groups, which was further confirmed by the Achilles functional index and histological analysis at 8 weeks. In conclusion, DOPA-PCL-5000 can be used not only for damaged Achilles tendon, but also for various functional tendon regeneration techniques such as rotator cuff, patellar tendon, and flexor tendon. (C) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
NSTL
Elsevier