Iniguez, Freddy BaltazarJeong, HuiminMohamed, Ahmed YousefNogales, Paul Maldonado...
9页
查看更多>>摘要：We investigated the structural and electrochemical properties of Li-Ti-O (LTO) and carbon nanotube (CNT)-added LTO for anode material in secondary Li-ion batteries using various techniques. The study focused on elucidating the effects of the microstructural evolution in LTO and the CNT addition on battery functionality. For all the tested compositions of LTO ([Li]/[Ti] = 0.9, 1.0 and 1.22), the system is fully oxidized to comprise a mixed-phase having Li4+2 delta Ti5O12+delta (delta's are approximately 0.14, 0.25, and 0.65, respectively) and Li2TiO3 structures. The results of the half-cell tests show a decrease in charge/discharge capacity with increasing [Li]/[Ti] ratio, and the detailed structural and chemical analyses unequivocally reveal that the such degradation in the electrochemical property originates mainly from the increase of Li content (delta). Meanwhile, after adding CNT, the Li capacity becomes greatly increased while the LTO composition and the redox kinetics do not change significantly. The origin of the improved specific capacity is associated with the formation of micron-sized structures at the surface of the LTO particles. Thereby we demonstrate that surface engineering via the CNT addition is a promising way to improve the performance of the LTO-based anode material. (C) 2022 The Author(s). Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
查看更多>>摘要：In this study, the adsorption behavior of CuO-GeSe, NiO-GeSe, and Ag2O-GeSe towards the main dissolved gases CO, CH4, C2H2, and C2H4 in transformer oil was systematically studied based on DFT. The adsorption structure, band structure, density of states, deformation charge density, and molecular orbit were analyzed to explore the interaction between the modified monolayers and gases. The results show that the adsorption of the four target gases on pristine GeSe belongs to weak physical adsorption. Metal oxides modification improves the conductivity of GeSe, and the formation of numerous triangular structures makes the modified substrates hard to deform during gas adsorption. Due to the poor gas sensitivity and extremely short recovery time of CH4 on CuO-GeSe, NiO-GeSe, and Ag2O-GeSe, these three modified structures are not suitable to be used as a material for detecting CH4. The conductivity of MO-GeSe changes in different degrees after adsorbing CO, C2H2, and C2H4. The gases can be detected according to the different change rule of conductivity upon adsorption. In addition, gas desorption from the substrate can be achieved by controlling the temperature. This study provides a theoretical basis for the application of gas sensors used in DGA. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：We report a sensitive voltammetric sensor for chlorpyrifos based on TiO2@Fe-imidazole MOF nanocomposite through hydrothermal process modified glassy carbon, screen printed carbon and graphene electrodes (MGCE, MSPCE & MSPGE). The electrode surface morphology and enhancement study was performed through SEM, electrochemical impedance spectroscopy Randels fit analysis and the results revealed that the TiO2@Fe-imidazole MOF modified electrodes reduced the resistance of the redox probe, which helps to promote the sensing ability and electro oxidation behaviour of chlorpyrifos. A voltammetric result revealed that the TiO2@Fe-imidazole MOF at MGCE, MSPCE and MSPGE detects potential at 8.91E(-07):0.161 V, 2.52E(-06); 0.26 V and 4.86E(-06); 0.322 V respectively. The developed sensor exhibits low detection limit of 10 pg/drop through DROPSENS and revealed excellent degradation efficiency through spectro-electrochemical degradation of chlorpyrifos with TiO2@Fe-imidazole MOF. The real time drop sensing of TiO2@Fe-imidazole MOF at modified electrodes performed with real samples exhibits good sensitivity and selectivity towards chlorpyrifos. Hence, this characteristic of MOF helps to improve the futuristic environmental applications at one drop.(C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Ko, Dong HyunKang, Seok ChangLee, Chul WeeIm, Ji Sun...
9页
查看更多>>摘要：To investigate the effects of porous properties of supports on the methane decomposition of Co-Mo/MgO catalysts, supports having different porous properties were prepared by varying the synthesis temperature of MgO. Co-Mo/MgO catalysts were prepared using the impregnation method. The CM/4MgO catalyst using 4MgO support, which had the largest specific surface area of 170 m(2)/g, showed highest methane conversion of 85.7 % with 60.12 % of MWCNT production. The produced MWCNT on CM/4MgO had highest crystallinity and electrical conductivity with average diameter of 20.5 +/- 7.8 nm. Overall, the improved pore structure of MgO prepared by the oxidation process enhanced the dispersibility of the Co active metal, thereby improving methane conversion and MWCNT production. (C) 2022 The Author(s). Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
查看更多>>摘要：Biocidal and anti-fouling properties in the same polymeric membranes are important in biomedical field for their capability to protect serious infection and filtration of biological molecules. For this purpose we report random graft copolymer of poly(vinylidene fluoride) (PVDF-graft-poly(tBAEMA-ran-OEGMA, PVBO) membranes showing both antifouling and antibacterial activity. The PVBO copolymer is synthesised using ATRP technique and the polymer membranes are produced by breath figure (PVBO-1) and phase inversion (PVBO-2) techniques. The former shows well-developed hexagonal pores (diameter 15 +/- 3.5 nm), and good hydrophilicity (contact angle 41.3 degrees). PVBO-1 membrane exhibits good antifouling property for both lysozyme and BSA solutions. Antimicrobial activity measured from agar diffusion method indicates that PVBO-1 shows a large zone of inhibition in case of gram-negative E coli and gram-positive S. aureus bacteria, whereas PVBO-2 and its HCl treated state (PVBO-3) membranes exhibit only a moderate zone of inhibition. The MBC and MIC values indicate that the synthesized membranes are bactericidal in nature and not bacteriostatic. Live and dead cell assay indicates that PVBO-1 can significantly inhibit growth of bacteria even at high bacteria concentration confirming high antimicrobial activity. MTT assay suggests PVBO-1 is non-cytotoxic to mammalian cells and co-culturing activity result suggests high cellular selectivity of PVBO-1.(c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Modern colloidal chemistry has enabled the controlled synthesis of various noble metal nanoparticles with unique physical and chemical properties. However, solution-based synthesis still suffers from limited productivity, particularly in industrial applications. We have developed the gram-scale synthesis of gold nanoparticles (AuNPs) using a polymerizable deep eutectic solvent (DES) via solid-solution-solid phase transitions. The DES plays two important roles, as a designer solvent. First, the solvating power of the DES allows the precursors to dissolve easily, even at high concentrations. Second, the concomitant polymerization of the DES with the synthesis of highly concentrated AuNPs and their consequent fixation in the polymer matrix is crucial for their stabilization. This rapid one-pot synthesis provides the highest productivity, among the other previously reported gram-scale syntheses of AuNPs. The procedure can be easily extended to conduct multiple reactions in a high-throughput manner. The chemical and physical properties and synthesis mechanisms of the AuNPs are thoroughly investigated. The synthesis of other noble metal (Pd, Ag, Au) nanoparticles, which are mono-and bimetallic, has also been demonstrated using the DES. As a practical application, a large-area transparent display is demonstrated using AuNPs synthesized in the DES, implying the scope for further industrial applications. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：We herein report a method for the chemical depolymerization of the epoxy resin present in a carbon composite through an advanced oxidation reaction using hydroxyl radicals. It was found that decomposition of the epoxy resin by the hydroxyl radicals generated from NaOCl was complete within 2 h at 100 degrees C and ambient pressure in an aqueous solution. The effects of different radical initiators (i.e., potassium persulfate (KPS) and 4,4'-azobis(4-cyanovaleric acid) (ACVA)) on the acceleration of hydroxyl radical generation from NaOCl were also evaluated. More specifically, the rate of hydroxyl radical formation in the presence and absence of a radical initiator was determined using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical method, and it was confirmed that the radical generation rate was increased by up to 3 times when the KPS radical initiator was employed (c.f., in the absence of an initiator). Interestingly, it was confirmed that the reaction rate constant (k) increased by up to 5.3 times when the combination of NaOCl and radical initiator KPS was applied to the recycling of carbon fiber-reinforced plastic (CFRP). In addition, X-ray photoelectron spectroscopy, Raman spectroscopy, and Field-emission scanning electron microscopy observations of the reclaimed carbon fiber demonstrated that no significant damage occurred during the reaction. This result is expected lead to novel methods for enhancing the rate of CFRP chemical recycling processes. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Park, BumjunKim, JigyeongGhoreishian, Seyed MajidRethinasabapathy, Muruganantham...
9页
查看更多>>摘要：In this study, we design and synthesize multi-functional adsorbents using a customized needle injector and determine the simultaneous adsorption performance toward hazardous materials, including radioac-tive cesium (Cs+), strontium (Sr2+), and chemical dye rhodamine B (Rh B). A tri-functional core is synthe-sized using a tetrapod needle injector, which is equipped with an aligner and a supporter to align the syringe needles, to rapidly realize a one-step encapsulation of functional reagents including Prussian blue, hydroxyapatite, and MXene. Subsequently, a magnetic shell is generated via a chemical co-precipitation process. Results show that the simultaneous adsorption behaviors of the adsorbents toward the three hazardous materials are consistent with the Langmuir model, where maximum adsorption capacities of 42.744, 27.669, and 18.440 mg g(-1) are recorded for Cs+, Sr2+, and Rh B, respectively. In addi-tion, the adsorbents are separated from the aqueous solution within 5 s by the introduction of external magnetic fields, which can be applied to magnetic actuation. We believe that the generated multi-functional adsorbents can facilitate the development of multi-functional materials and provide signifi-cant guidelines for water remediation, particularly on radioactive isotopes and chemical dyes. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Chemodynamic therapy (CDT) based on multifunctional nanoparticles (NPs) has occurred as an attractive cancer treatment that covers the shortage of nonnegligible limitations from single therapy. Herein, we synthesize a safe and universal CDT nanoparticle-iron single-atom nanoparticle (Fe SANP), in which Fe single-atom as the active catalytic site is anchored in a carbon framework with encapsulated doxorubicin (DOX). Fe SANPs work as catalase-like nanozyme for hydroxyl radicals (center dot OH) production. The prepared NPs (denoted as DOX@Fe SANPs) can efficiently mediate peroxidase-like activity with the existence of H(2)Othat enhances cancer cell elimination by generating abundant center dot OH. DOX@Fe SANPs exhibit a pH induced degradable character that contributes to specific drug release in the tumor microenvironment (TME). DOX@Fe SANPs produce ignorable systematic toxicity after biodegradation and drug delivery processes. Collectively, this study highlights the efficient anti-tumor performances of the iron single-atom nanocatalysts containing an anti-cancer drug DOX. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：With an exponential increase in fossil fuel consumption and an increasing demand for carbon-based materials, it draws the attention of researchers to seek alternative carbon sources. Herein, we report the sustainable route for the synthesis of ionic carbon from bio-derived sugarcane-waste (Bagasse) and further anchoring with iminophosphine rhodium complex (Rh@BCNP) and utilized for tandem hydro-formylation reaction. The SEM analysis confirms the formation of spherical shape morphology of carbon with sizes ranging from 30-150 nm. The successful functionalization of the iminophosphine rhodium complex on the carbon surface was determined by XPS, TEM, FE-SEM, P-31 NMR, C-13 CP-MAS-NMR, and FTIR analysis. Furthermore, ICP-OES analysis confirms the presence of 0.307 mmoles/g of Rh and 0.484 mmoles/g of P on the carbon surface. Rh@BCNP catalyst is the best combination of triphenylphosphine ligand, imine, and rhodium metal, resulting in hybrid material with some acidic properties of carbon that favour the selectivity towards linear products. Rh@BCNP showed remarkable catalytic performance under moderate reaction conditions (80 degrees C, 40 bar (CO + H-2)) in 5 h. This sharp divergence from other methods leading to linear amines and acetals results in a novel atom economic approach to synthesize pharmaceuticals and industrial products. The Rh@BCNP catalyst gave recyclability up to five cycles. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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