查看更多>>摘要：Nano sized materials have gathered significant attention during the last few decades due to their unique chemical, physical, electrical, optical and mechanical properties. Titanium dioxide (TiO2) is non-toxic and has good corrosion resistance, high chemical and thermal stability. TiO2 has a wide range of applications including as photocatalysts, in solar cells, self-cleaning surfaces, wastewater treatment and as an antimicrobial agent. A number of methods have been implemented for the synthesis of TiO2 nanoparticles and among these, so-called 'green' approaches, for example those that employ renewable resources and/or require low energy input, are attractive because they can be cost-effective, less hazardous and environmentally sustainable. This review explores recent advances in the synthesis of TiO2 nanoparticles derived from phytochemical sources and benchmarks their performance in a range of applications against nanoTiO(2) produced by more conventional methods. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：This article contributes a broad analysis of the latest improvement on energy storage operations using single layer surface modified graphene oxide (GO). GO, a thin structure of graphite oxide, is a modified graphene, holding several oxygen-casing functional groups. This provides GO with numerous distinctive features for multipurpose applications in capacitors, fuel cells and batteries. Precise applications are distinguished primarily comprising use in electrodes as the dynamic substantial's to augment the recital or as substrates to discriminate the configurations, in solid-state solution and membranes techniques to advance the ionic attraction and other behaviors, and in internal structure layers to guard the current collectors, membranes or electrodes. Additionally, the problems, difficulties and looming overlooks are conferred in the article for promising promotes research development of GO applications. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：The study in the field of surface nanobubbles has received great progresses since surface nanobubbles were imaged with atomic force microscopy in 2000. Meanwhile, the interest in developing new flotation techniques for separating fine particles keeps increasing. Surface nanobubbles are showing a great potential of application in the field of mineral processing. The formation of agglomerations composed of fine minerals and the easier attachment of a mineral particle to a flotation bubble are the mechanism for the improved flotation performance in the presence of surface nanobubbles. In this work, various aspects regarding surface nanobubbles including the methods for generation, measurement and identification of surface nanobubbles, the responses of surface nanobubbles to external stimuli including pH, salts, surfactants, temperature, pressure, ultrasonication et al., where flotation is usually performed are summarized. At last, we reviewed recent progresses for surface nanobubbles in flotation. This review gives perspectives for further research in the future.
查看更多>>摘要：Metal nanoparticles have always attracted attention for applied catalysis in technical fields including sensor applications. Biogenically synthesized nanoparticles are uniquely non-toxic and possess enhanced antimicrobial activity. Eco-friendly palladium nanoparticles (PdNPs) synthesized from plant extracts and/or biopolymers have wide biomedical, environmental, and biosensor applications. The size, shape, stability, and catalytic behavior of PdNPs are influenced by factors such as pH, temperature, concentration of metallic salt, and concentration of plant extract/biopolymer solutions. This review article focuses on the comprehensive synthesis of biogenic PdNPs from phytochemicals/biopolymers and concisely reports their heterogeneous organic catalytic applications. Furthermore, improved catalytic efficiencies, selectivities, and reaction yields of organic coupling reactions catalyzed by biogenic PdNPs are discussed in detail. This review highlights the safety, sustainability, and effective catalytic activity of biogenic PdNPs for organic coupling reactions, which ensures lesser toxic waste generation and reduces hazardous effects on the environment. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Quality control of the crystalline materials obtained from melts with the difficulty of nucleation is challenging. When nucleation is enhanced in such melts, the quality distribution is improved. Herein, the aeration method, which enhances nucleation in solution systems, was employed in a melt to investigate the aeration effect on nucleation in a melt and the effect of the crystallization conditions with aeration on the induction time tau(ind). Experimental results show that aeration enabled nucleation in a melt under supercooling conditions, where nucleation could not occur without aeration. Furthermore, tau(ind) depended on the operating conditions with aeration (initial supercooling, aeration period, and atmospheric temperature). The crystal size in the obtained solid phase decreased as the atmospheric temperature decreased. These results suggest that the desired nucleation timing and crystal size can be obtained by manipulating the crystallizer and aeration conditions. Thus, aeration is promising for improving the quality distributions in crystalline materials. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Pugachevskii, Maxim AlexandrovichMamontov, Vladimir AlexandrovichSyuy, Alexander VyacheslavovichKuzmenko, Alexander Pavlovich...
3页
查看更多>>摘要：The physicochemical properties of ablated cerium dioxide nanoparticles have been studied in the photocatalytic degradation of methylene blue in the presence of a ZnO nanocatalyst. It was shown that in the photocatalytic process, CeO2 nanoparticles exhibit good antioxidant properties due to an increased content of structural defects in the surface atomic layers of ablated nanoparticles. It was found that the antioxidant activity of the particles increases with a growth of the pH of the aqueous solution. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：As a new type of biomass-based molecular material, nanocrystalline cellulose (NCC) has become a research hotspot in many fields. In present work, a novel microfluidic technology was employed to produce NCC from microcrystalline cellulose (MCC) via sulfuric acid hydrolysis. The microfluidic chip was designed and made with complete load-bearing reaction according to flow characteristics. A closed reaction environment and fully automated operations can ensure the safety of experimenters. NCC (MN-60) with high yield and uniformity was obtained via acid hydrolysis in microfluidic system by 60 % sulfuric acid solution at 35 degrees C for 40 min. The characteristics of MN-60 and conventional method NCC (N-60) under the same reaction conditions were compared. It was found that the yield of MN-60 reached 48.13%, while it was only 17.30 % in the absence of microfluidic chip. Although the results showed that MN-60 and N-60 exhibited similar rod-like structures, the size distribution of MN-60 was narrower than that of N-60. Furthermore, the width, length, and height of MN-60 were 15 +/- 5 nm, 150 +/- 75 nm, and 5 +/- 2 nm, respectively. The main functional groups and crystal forms of MN-60 were similar to MCC, but the crystallization index of MN-60 was higher than MCC. In conclusion, microfluidic technology could realize the preparation of high-yield and uniform NCC. (c) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
Vakalova, T. V.Sergeev, N. P.Maksimova, V. E.Rusinov, P. G....
17页
查看更多>>摘要：The processes of obtaining a new type of ceramic proppants with high physical and mechanical properties based on serpentinite rocks, which were not previously used for this purpose are investigated. To increase the strength of ceramic materials, methods of improving the sintering of magnesia-silicate ceramics with a forsterite crystalline phase are considered. It was found that the activation of the sintering process is provided by the transformation of hard-to-sinter forsterite into enstatite. This is possible by adding of siliceous raw materials with different reactivity (quartz sand, marshalite, gaize and diatomite) to the pre-calcined serpentinite. The use of diatomite and gaize additives in an amount of 20-30% instead of quartz sand allows to reduce the firing temperature by 50-70 degrees C (from 1300-1350 degrees C to 1280 degrees C-12 50 degrees C) and ensure the mechanical strength of pressed specimens up to 440 MPa. This made it possible to develop compositions and technological parameters for obtaining magnesia-silicate proppants with a bulk density of 1.58-1.62 g/cm3 at a firing temperature of 1250-1300 degrees C, capable of withstanding breaking pressure up to 52 MPa. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Owing to the enhanced electrical conductivity, sensitivity, selectivity, cost-effective, and simple sampling methods, rare-earth pyrochlore structured stannates (M2Sn2O7) have been referred to as an elegant system for electrochemical sensing applications. Because of this, novel pyrochlore structure lanthanum stannate nanoparticles (La2Sn2O7 NPs) was synthesized via an eco-friendly method and further characterized through various spectroscopic & microscopic techniques. The electrocatalytic property of La2Sn2O7 NPs was examined by fabricating it over a glassy carbon electrode (La2Sn2O7 NPs/GCE) in acidic media as a working electrolyte. The effect of variables such as the amount of La2Sn2O7 NPs suspension and pH of the solution was optimized. Subsequently, after optimizing measurement conditions, the proposed La2Sn2O7 NPs sensor shows excellent selectivity, sensitivity, linear ranges (0.01 to 127 mu M & 127-1437 mu M), the limit of detection (6 nM) and limit of quantification (0.10 mu M). The active sites, presence of metal oxide bonds, higher resistivity, and faster electron mobility paid away for the enhanced electrocatalytic activity of the proposed sensor. Furthermore, the La2Sn2O7 NPs act as promising electrode modifiers for real sample investigation of clove samples with accepted recovery rates (86-98%). Hence, the La2Sn2O7 NPs sensor act as a hopeful electrode modifier for the determination of eugenol. (C) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chem-istry.
查看更多>>摘要：Hydrophilic zeolites with low catalytic activity are considered as suitable adsorbents for drying gas streams containing olefinic compounds. In this contribution, the surface treatment of kaolin and attapulgite/zeolite A extrudates is investigated using argon glow discharge plasma. The zeolite is synthesized from kaolin using the hydrothermal method. Surface and bulk characterization is performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), N-2 physisorption, Fourier-transform infrared (FTIR) spectroscopy, temperature-programmed-desorption (TPD) of NH3 and X-ray photoelectron spectroscopy (XPS) techniques. Plasma treatment increases surface area and pore volume, but it decreases the weak acidic site density of the extrudates. The obtained results show that attapulgite/zeolite extrudates are more affected by plasma treatment than kaolin/zeolite extrudates. The catalytic activity of untreated and plasma-treated extrudates are compared with respect to coke formation resulting from 1-butene and 1,3-butadiene. The plasma-treated sample is more resistant to coke formation (similar to 35% decrease compared to untreated one). The potassium contents of extrudates decreased as a result of sputtering loosely bound potassium cations on the crystal surface by argon ions, which led to a decrease in water sorption capacity (by similar to 15% of the initial sorption capacity). (C) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chem-istry.
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