Author
Ayrlane Sales
Other affiliations: Federal University of Pernambuco
Bio: Ayrlane Sales is an academic researcher from Federal Institute of Pernambuco. The author has contributed to research in topics: Isophorone & Adsorption. The author has an hindex of 2, co-authored 3 publications receiving 16 citations. Previous affiliations of Ayrlane Sales include Federal University of Pernambuco.
Topics: Isophorone, Adsorption, Electrolysis of water
Papers
More filters
TL;DR: In this article, the optimum conditions for the electrocatalytic hydrogenation of (R)-(+)-pulegone in water, using ultrasound (continuous or pulsed mode) and a nickel sacrificial anode have been determined.
Abstract: The optimum conditions for the electrocatalytic hydrogenation of (R)-(+)-pulegone in water, using ultrasound (continuous or pulsed mode) and a nickel sacrificial anode have been determined. The continuous ultrasound (14 W), without temperature control, showed to be a most effective technique if compared with pulses of 0.2 s applied after each second. The sonication of the reaction solution presented a slight stereochemical effect on the product distribution, and its magnitude depends on both the ultrasound power and the mode. Simultaneous ultrasound irradiation during electrochemical process showed a synergetic effect, able to generate H radical from water H O bond rupture, in addition to the H radicals formed by the electrochemical reduction of water on the electrode surface, increasing both current efficiency and conversion yields. Chitosan microspheres were use in the removal of nickel ions of the aqueous medium showing an adsorption efficiency of 64%.
10 citations
TL;DR: In this paper, the influence of cyclodextrin (CyD) type, concentration and encapsulation time on the electrocatalytic hydrogenation (ECH) of isophorone was evaluated.
Abstract: Fundamentals and applications of a 23 factorial design were performed for assessing the influence of the cyclodextrin (CyD) type, concentration and encapsulation time on the electrocatalytic hydrogenation (ECH) of isophorone. Electrolysis were carried out using nickel as electrocatalyst and sacrificial anode. A discussion of model validation is presented. The analysis of the results showed that the most significant factors to the conversion rate were the CyD type and concentration, with 3 mmol dm−3 of βCyD giving the best results. The isophorone C=C hydrogenation yield, in the presence of βCyD, was 28 % higher than in its absence, and it is comparable to those obtained by other well-established ECH procedures in terms of hydrogenation yield, selectivity and current efficiency.
8 citations
TL;DR: In this article, the potential of cucurbit[5]uril to be used as inverse phase transfer catalyst in electrocatalytic hydrogenation of α,β-unsaturated ketones is illustrated.
Abstract: The potential of cucurbit[5]uril to be used as inverse phase transfer catalyst in electrocatalytic hydrogenation of α,β-unsaturated ketones is illustrated. The interaction behavior among isophorone and cucurbit[5]uril was also investigated using cyclic voltammetry and UV/vis absorption spectroscopy. The results concerning to both techniques revealed an enhancement in the intensity of the absorption peak and also in the current cathodic peak of isophorone in presence of cucurbit[5]uril. This achievement is related to the increase of the isophorone solubility in the medium being an indicative of a host-guest complex formation. The electrochemical hydrogenation of isophorone using cucurbit[5]uril was more efficient than others well-stablish methodologies. Regarding to (R)-(+)-pulegone and (S)-(+)-carvone, the use of cucurbit[5]uril leads to an increase of 17% and 9%, on average, respectively, in the yields when compared to the control reaction. The efficiency of selective C=O bond hydrogenation of 1-acetyl-1-cyclohexene was evaluated. The presence of cucurbit[5]uril increased by 12% the hydrogenations yields of 1-acetyl-1-cyclohexene when compared to the control reaction. In this sense, these results open up an opportunity to carry out electrocatalytic reactions within the cucurbit[5]uril environment.
1 citations
Cited by
More filters
TL;DR: In this article, a two-stage US-ZVI/PS process was proposed, which reduced 35% of ZVI usage and saved 74.2% of energy consumption compared with traditional ZVI-PS process.
16 citations
TL;DR: In this paper, the use of commercial graphite powders (different sources and particle sizes) as electrode materials, was evaluated in an electrochemical cavity cell, where the surface chemistry of both graphites was modified by HCl treatment, followed by 200°C heating, prior to electrode fabrication, which was found to play an important role on the electrode performance.
15 citations
TL;DR: Results indicated that the method combined magnetic solid phase extraction with HPLC was promising for the determination of carbaryl and carbofuran at trace amounts.
Abstract: In this study, porous sandwich structure Fe3 O4 nanoparticles coated by polyhedral oligomeric silsesquioxanes and β-cyclodextrin were prepared by surface polymerization and were used as the magnetic solid phase extraction adsorbent for the extraction and determination of carbaryl and carbofuran. The Fe3 O4 nanoparticles coated with polyhedral oligomeric silsesquioxanes and β-cyclodextrin were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, vibrating sample magnetometry, and scanning electron microscopy. After optimizing the extraction conditions, a method that combined magnetic solid phase extraction with high-performance liquid chromatography was developed for the determination of carbaryl and carbofuran in apple. The method exhibited a good linearity in the range of 2-400 μg/kg for carbaryl and carbofuran (R2 = 0.9995), respectively. The limits of detection were 0.5 μg/kg of carbaryl and 0.7 μg/kg for carbofuran in apple, respectively. Extraction recoveries ranged from 94.2 to 103.1% with the preconcentration factor of 300 and the relative standard deviations were less than 5.9%. These results indicated that the method combined magnetic solid phase extraction with high-performance liquid chromatography and was promising for the determination of carbaryl and carbofuran at trace amounts.
14 citations
TL;DR: In this article, the optimum conditions for the electrocatalytic hydrogenation of (R)-(+)-pulegone in water, using ultrasound (continuous or pulsed mode) and a nickel sacrificial anode have been determined.
Abstract: The optimum conditions for the electrocatalytic hydrogenation of (R)-(+)-pulegone in water, using ultrasound (continuous or pulsed mode) and a nickel sacrificial anode have been determined. The continuous ultrasound (14 W), without temperature control, showed to be a most effective technique if compared with pulses of 0.2 s applied after each second. The sonication of the reaction solution presented a slight stereochemical effect on the product distribution, and its magnitude depends on both the ultrasound power and the mode. Simultaneous ultrasound irradiation during electrochemical process showed a synergetic effect, able to generate H radical from water H O bond rupture, in addition to the H radicals formed by the electrochemical reduction of water on the electrode surface, increasing both current efficiency and conversion yields. Chitosan microspheres were use in the removal of nickel ions of the aqueous medium showing an adsorption efficiency of 64%.
10 citations
TL;DR: In this article , the authors used coupled experimental and computational approaches to investigate bubble formation under those conditions where there are important convective effects, and they measured both normal and parallel velocity of the solution and built up a computational fluid dynamics model.
8 citations