Showing papers on "Acetone published in 2019"
TL;DR: In this article, the p-nitrophenylacetonitrile solubility in ethanol, methanol, isopropanol, n-propanol, acetonitriles, acetone, ethyl acetate, toluene and cyclohexane was investigated.
Abstract: The investigation on p-nitrophenylacetonitrile solubility in ethanol, methanol, isopropanol, n-propanol, acetonitrile, acetone, ethyl acetate, toluene, n-butanol, cyclohexane, 2-butanone, isobutano...
120 citations
TL;DR: Europium (Eu)-containing covalent organic framework synthesized via a Schiff-base reaction between DhaTab-COF-EuIL and 1,3,5-tris(4-aminophenyl)benzene shows unique dual luminescence emissions of Eu3+ and COF material, but also exhibits remarkably luminescent quenching towards acetone.
Abstract: Chronical exposure to volatile acetone could damage to the liver and kidney or nerve, and cause inflammation. Design of novel materials for the sensitive and selective detection of acetone is of great importance. We report on a europium (Eu)-containing covalent organic framework (DhaTab-COF-EuIL) synthesized via a Schiff-base reaction between 2,5-dihydroxyterephthalaldehyde (Dha) and 1,3,5-tris(4-aminophenyl)benzene (Tab) followed by an ionic liquid (IL)-modification and then ion displacement. The resulting DhaTab-COF-EuIL is microporous and crystalline, and not only presents unique dual luminescence emissions of Eu3+ and COF material, but also exhibits remarkable luminescence quenching toward acetone. Especially, the DhaTab-COF-EuIL could be a novel luminescent sensor, displaying high sensitivity and selectivity for the detection of volatile acetone with a limit of detection down to 1%.
88 citations
TL;DR: Parallel electron paramagnetic resonance investigations using egg yolk lecithin model liposomes revealed that the fluidity of the phospholipid system in cell membranes may either be considerably decreased (Nujol, DMF, ethanol) or increased (acetone), thus rendering difficult the intracellular nutrient supply.
Abstract: The effect of methanol, ethanol, acetone, N,N-dimethylformamide (DMF), dimethyl sulfoxide and Nujol on the growth of Escherichia coli DH5α, Bacillus subtilis and Saccharomyces cerevisiae D273 was investigated. All of the tested cultures appeared susceptible to the organic media they were treated with, which evinced in apparent hindering of cell development. The observed diverse solvent tolerance, except from their different biochemical activity, may also be related to the changes in cell membrane fluidity induced by the solvent species. Parallel electron paramagnetic resonance investigations using egg yolk lecithin model liposomes revealed that the fluidity of the phospholipid system in cell membranes may either be considerably decreased (Nujol, DMF, ethanol) or increased (acetone), thus rendering difficult the intracellular nutrient supply. Hence, even the chemically neutral Nujol produced a distinct cell-growth inhibitory effect. These results are fairly consistent with the outcome of the survival tests, particularly for the bacteria strains.
69 citations
TL;DR: In this paper, nano-architecturing of highly sensitive SnO2-based gas sensors prepared by molecular imprinting technique with the presence of acetone and/or ammonia solvents to develop a sensor that has the ability to detect both gases which is being developed for the first time.
Abstract: This article presents the nano-architecturing of highly sensitive SnO2–based gas sensors prepared by molecular imprinting technique with the presence of acetone and/or ammonia solvents to develop a sensor that has the ability to detect both gases which is being developed for the first time. Nanoparticles are prepared via hydrothermal method and then they have been characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and N2 adsorption-desorption analyzer (BET) to determine their morphology, crystal structure, optical properties and surface area properties respectively. Four SnO2 films are fabricated using spin coating under different conditions of introducing ammonium hydroxide or acetone during the hydrothermal synthesis. Regular microsheets of about 5 μm in length and 500 nm thickness have been built up from nanoparticles of sizes ranged from 20 to 50 nm depending on the preparation conditions. The sensing properties of the fabricated sensors are tested against (ammonium hydroxide, acetone, LPG, oxygen and benzene), where the results showed that when the participation of the solvent during the synthesis process, it increases the response for these gaseous. The performance of the gas sensor devices is demonstrated and got higher values (about 90%) for Ammonia gas when the device is template with ammonium hydroxide and water and washed with water (SD) and limit of detection (600 ppb). Also, high sensitivity (about 77%) for Acetone is recorded for the device is template with ammonium hydroxide and acetone and washed with acetone (SA) and limit of detection (280 ppb).
57 citations
TL;DR: In this paper, depolymerization of isolated lignin from organosolv fractionation of bagasse in the presence of several homogeneous and heterogeneous acid catalysts was studied.
54 citations
TL;DR: In this article, the authors fabricated Ce-, V-, or W-doped TiO2 supported ultralow loading Pt catalysts via the in-situ molten salt method, and evaluated their catalytic performance for acetone removal.
Abstract: Volatile organic compounds (VOCs) cause damage to atmospheric environment and human health. Supported noble metal catalysts are widely used to control VOCs emissions. The high cost, and low H2O-, CO2-, and SO2-resistance of such catalysts are worthy to be improved. Herein we fabricated Ce-, V-, or W-doped TiO2 supported ultralow loading Pt catalysts via the in-situ molten salt method, and evaluated their catalytic performance for acetone (major pollutants in pharmaceutical industry) removal. Under the present reaction conditions, all the catalysts exhibited high catalytic activity and stability for acetone oxidation, with the temperature required 90% acetone conversion being of 245 °C over 0.57 wt% CeO2-0.05 wt% Pt/TiO2. The doping of Ce, V, or W enhanced the H2O-, CO2-, and SO2-tolerance ability of 0.05 wt% Pt/TiO2. More than 85 %85%, 70%, or 60% of acetone could be removed even in the presence of 20 vol% water vapor, 10 vol% CO2, or 100 ppm SO2, respectively. The improvement in SO2-tolerance ability was due to the inhibition of SO2 adsorption and oxidation activity as well as Ti(SO4)2 or TiOSO4 formation. Acetone complete oxidation over 0.57 wt% CeO2-0.05 wt% Pt/TiO2 would follow the pathway: adsorbed acetone molecules → acetic acid and formic acid → carbonate species → CO2 and H2O. The present supported Pt catalysts might be suitable for oxygenated VOCs removal.
53 citations
TL;DR: In this article, the authors showed that 5-(hydroxymethyl) furfural (HMF) and acetone can be selectively converted into a range of biomass-derived high molecular weight chemicals in high yield (>90%).
51 citations
TL;DR: In this article, a facile method for the preparation of CoFe2O4 nanoparticles with a small size of 10 nm was reported, which exhibited high sensitivity to acetone.
51 citations
TL;DR: In this paper, the adaption energy of acetone to (MO)12 nanoparticles and their graphene composites was studied by density functional theory, and it was found that the (ZnO)12 and its graphene composite were not sensitive to the acetone.
51 citations
TL;DR: In this paper, a first optimization study regarding orange peel waste (OPW) acetone extraction, and acid and enzymatic hydrolysis was developed via Taguchi design of experiments, leading to high yields in essential oils, phenolic compounds, highly-methylated pectin and free sugars and monomers.
43 citations
TL;DR: In this paper, a series of hydrotalcite-derived oxides MAlO (Mn, Co, Ni, Fe) were prepared by calcinating of hydralcite for acetone and acetaldehyde total oxidation, the results confirmed that the highest of CO2 yield and the lowest amount of by-product was observed over MnAlO catalyst.
TL;DR: In this article, a facile one-pot microwave assisted hydrothermal method was used to synthesize monoclinic and hexagonal WO3 nanocrystallines for detecting acetone vapor.
TL;DR: In this article, mesoporous hollow nanospherical (MHS) MnxCo3−xO4 solid solutions with tunable Mn/Co molar ratios in the spinel-type cubic crystal phase, fabricated by a facile solvothermal alcoholysis approach, have been developed to catalyze acetone oxidation.
TL;DR: The larger bio-oil yield and smaller residue yield obtained from cellulose liquefaction in solvents were achieved under the suitable conditions, and the type ofsolvents was the main effect to the distribution of the composition of bio- oil.
TL;DR: In this paper, three kinds of MnO2 nanorods with different crystal phases, e.g. α-, β- and γ-MnO2, have been prepared by a one-pot hydrothermal method with goals to explore their crystal-phase dependent catalytic performances for acetone elimination.
Abstract: Developing metal oxides with tailored crystal phases has become a research hotspot in environmental catalysis. In this work, three kinds of MnO2 nanorods with different crystal phases, e.g. α-, β- and γ-MnO2, have been prepared by a one-pot hydrothermal method with goals to explore their crystal-phase dependent catalytic performances for acetone elimination. The results attest that α-MnO2 gave the optimal acetone oxidation activity as compared with β- and γ-MnO2, completely achieving 100% acetone conversion and 100% CO2 selectivity at 120 °C under the reaction conditions of acetone concentration = 1000 ppm, 20 vol% O2/N2 and WHSV = 90 000 mL gcat−1 h−1. This superior activity of α-MnO2 mainly originated from its unique crystal phase that resulted in the synergistic effect by combining the largest crystal tunnel size, the highly enhanced chemical nature originating from more Mn4+ cations, the highly improved low-temperature redox properties and the weakest Mn–O bond strength. Meanwhile, three kinds of MnO2 nanorods also demonstrated strong long-term stability and good water tolerance for acetone elimination, showing good potential in practical applications.
TL;DR: In this paper, the authors measured the solubility of methylene blue in methanol, ethanol, 2-propanol, acetone, ethyl acetate, and water.
TL;DR: In this article, a quasi-solid solution anode for partial methane oxidation was used to produce propionic acid, acetic acid, and acetone from natural gas, and the intermediate products were further oxidized into propionic acids, acetone, and 2-propanol.
Abstract: Efficient utilization of abundant methane (CH4) from natural gas remains a major catalysis challenge. One recommended strategy is to convert methane into liquid fuels, such as alcohols, ketones and acids, but most processes usually proceed through high-temperature routes. Here, we employ a ZrO2:NiCo2O4 quasi-solid solution catalyst as the electrochemical anode for partial methane oxidation. Without high temperature, noble metal catalysts and expensive oxidants, this quasi-solid solution anode produces propionic acid, acetic acid and acetone. After the analysis of the products, we demonstrate that the intermediate products from partial methane oxidation, 1-propanol, acetaldehyde and 2-propanol, are further oxidized into propionic acid, acetic acid and acetone, respectively. Long-term stable production via methane oxidation is a new strategy for the electrochemical conversion of organic chemicals.
TL;DR: In this article, the treatment of barley straw with 1-ethyl-3methylimidazolium acetate [EMIMAcO] ionic liquids and subsequent precipitation with antisolvent mixtures, thus allowing the separation of the sugar-rich fractions (cellulose and hemicellulose) from the lignin fraction, were studied.
Abstract: We propose the treatment of barley straw with 1-ethyl-3-methylimidazolium acetate [EMIMAcO] ionic liquids (ILs) and subsequent precipitation with antisolvent mixtures, thus allowing the separation of the sugar-rich fractions (cellulose and hemicellulose) from the lignin fraction. For this purpose, different concentration ranges of acetone:water antisolvent mixtures were studied. In all cases, a high recovery percentage and a high and effective separation of fractions was achieved for 1:1 acetone:water. The fractionated lignocellulosic compounds were studied by using infrared spectroscopy, scanning electron microscopy and 1H nuclear magnetic resonance characterization techniques. This method allows the possibility of reusing IL, confirming the versatility of the established method. The fraction rich in cellulose and hemicellulose was subjected to acid hydrolysis (0.2 mol/L H2SO4) for 5 h at 140 °C, obtaining a yield of total reducing sugars of approximately 80%, much higher than those obtained in non-pretreated samples.
TL;DR: In this paper, the authors investigated the effect of external diffusion on the adsorption and desorption of two typical oxygenated VOCs on silica gel by using the Langmuir-Freundlich model and showed that the final ratio of adsorbed acetone to ethyl acetate is dependent on the adorption bed height.
TL;DR: Aldol condensation of 5-hydroxymethylfurfural (HMF) with acetone provides a route to upgrading of biomass intermediates into value-added compounds such as fuel precursors as discussed by the authors.
Abstract: Aldol condensation of 5-hydroxymethylfurfural (HMF) with acetone provides a route to upgrading of biomass intermediates into value-added compounds such as fuel precursors. This reaction gives C9 an...
TL;DR: In this paper, the authors derived that hydrogen competes with ketones for adsorption sites and that hydrogen underpotential deposition exerts an inhibiting influence on the reduction of ketones and eventually suppresses it.
TL;DR: In this paper, the Mole fraction solubility data of l-proline in five monosolvents (water, methanol, ethanol, acetone, and acetonitrile) and four binary solvent systems (methanol+acetone, ethanol + acetone and met...
Abstract: The mole fraction solubility data of l-proline in five monosolvents (water, methanol, ethanol, acetone, and acetonitrile) and four binary solvent systems (methanol + acetone, ethanol + acetone, met...
TL;DR: In this paper, an organosolv process involving pretreatment by aqueous glycerol followed by mild delignification with acetone for fractionation of Sugarcane trash (SCT) is reported.
TL;DR: In this article, the conversion of biomass, whether fresh or waste, into valuable chemicals and intermediates will be very useful to reduce dependence on fossil feedstock, which is a very useful technique.
Abstract: Conversion of biomass, whether fresh or waste, into valuable chemicals and intermediates will be very useful to reduce dependence on fossil feedstock. Furfural is a biomass-derived chemical which c...
TL;DR: In this article, the experimental results of ALPC in all the tested pure and binary solvent systems were experimentally measured via a static gravimetric method in the temperature range from 278.15 to 323.15
TL;DR: In this article, aldol condensation reactions between furfural and acetone were investigated and it was found that the presence of K in Sn-MFI catalyst improves the catalytic activity of the catalyst likely due to increased basicity.
TL;DR: The results indicated that solvent extraction had higher yields while SC-CO2 had a lower yield, and the yield of conventional solvent extraction increased with decreasing particle sizes.
TL;DR: In this paper, the best solvent mixture for extraction of antioxidant compounds from two varieties of mustard grains (white - Sinapsis alba and black - Brassica nigra) using a simplex centroid mixture design was determined.
TL;DR: In this paper, the specific surface area and porosity of Co-doped sponge-like In2O3 microstructures can be regulated through the modulation of Co/In molar ratios.
Abstract: Pure and 1–4 mol% cobalt doped indium oxide (Co-doped In2O3) sponge-like microstructures with high specific surface area were fabricated by a simple and environmentally friendly hydrothermal method. The specific surface area and porosity of Co-doped sponge-like In2O3 microstructures can be regulated through the modulation of Co/In molar ratios. The as-prepared sensors based on Co-doped In2O3 exhibit favorable gas sensing properties toward acetone gas; their porous structure can create more adsorption sites for the adsorption of oxygen molecules and the diffusion of the target gas, leading to significant improvement in sensing performance. In particular, 3 mol% Co-doped In2O3 presents the greatest response to acetone vapor at 240 °C, which is about 3.25 times higher than that of pure In2O3. The sensor also exhibits rapid response-recovery time (1.143 s/37.5 s), low detection limit (2.76 at 5 ppm), good reproducibility and high selectivity, making it a promising material for acetone detection.
TL;DR: In this paper, the degradation of cellulose was studied using 1-(3-propylsulfonic)-3-methylimidazolium chloride and 1-(4-butyl sulfonic)3methyloridazolinium chloride acidic ionic liquids as catalysts in acetone at 120°C for 3.5h.