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Ultrasonics Sonochemistry

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https://www.readbyqxmd.com/read/28501355/sono-photo-fenton-oxidation-of-bisphenol-a-over-a-lafeo3-perovskite-catalyst
#1
Meral Dükkancı
In this study, oxidation of bisphenol-A (IUPAC name - 2,2-(4,4-dihydroxyphenyl, BPA), which is an endocrine disrupting phenolic compound used in the polycarbonate plastic and epoxy resin industry, was investigated using sono-photo-Fenton process under visible light irradiation in the presence of an iron containing perovskite catalyst, LaFeO3. The catalyst prepared by sol-gel method, calcined at 500°C showed a catalytic activity in BPA oxidation using sono-photo-Fenton process with a degradation degree and a chemical oxygen demand (COD) reduction of 21...
May 5, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28438401/a-control-system-for-ultrasound-devices-utilized-for-inactivating-e-coli-in-wastewater
#2
H Ohrdes, I Ille, J Twiefel, J Wallaschek, R Nogueira, K-H Rosenwinkel
Sonochemical processes applied to wastewater treatment have an influence on the behavior of ultrasonic systems. This is especially due to the load characteristic of the sonochemical process itself and the temperature increase caused by internal damping within the converter. Hence, a controlling device is needed to guarantee the operation in resonance and to keep the vibration amplitude constant. This paper presents a digital control system for the operation of weak to strong damped ultrasonic devices and its application for inactivating Escherichia coli in wastewater...
April 16, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28438402/effects-of-ultrasonic-and-hydrodynamic-cavitation-on-the-treatment-of-cork-wastewater-by-flocculation-and-fenton-processes
#3
Zhilin Wu, Francisco J Yuste-Córdoba, Pedro Cintas, Zhansheng Wu, Luisa Boffa, Stefano Mantegna, Giancarlo Cravotto
This paper reports that ultrasonic (US) and hydrodynamic cavitation (HC) are efficient strategies for the environmental remediation of cork wastewater (CW). It is necessary to remove toxic, inhibitory or refractory organic matter from CW using physical and chemical techniques (pre-treatment) prior to performing conventional biological treatment. After this biological treatment, it is also critical to further decontaminate (post-treatment) in order to meet the discharge limitation. The pre-treatment of diluted CW using Fenton oxidation (FE) alone led to COD and polyphenol (PP) removal values of 30% and 61%, respectively, while HC and US resulted in 83-90% increases in COD reduction and 26-33% increases in PP reduction...
April 13, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28434880/ultrasound-assisted-extraction-of-rare-earth-elements-from-carbonatite-rocks
#4
Lisarb O Diehl, Thais L Gatiboni, Paola A Mello, Edson I Muller, Fabio A Duarte, Erico M M Flores
In view of the increasing demand for rare-earth elements (REE) in many areas of high technology, alternative methods for the extraction of these elements have been developed. In this work, a process based on the use of ultrasound for the extraction of REE from carbonatite (an igneous rock) is proposed to avoid the use of concentrated reagents, high temperature and excessive extraction time. In this pioneer work for REE extraction from carbonatite rocks in a preliminary investigation, ultrasonic baths, cup horn systems or ultrasound probes operating at different frequencies and power were evaluated...
April 12, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28412092/chaotic-oscillations-of-gas-bubbles-under-dual-frequency-acoustic-excitation
#5
Yuning Zhang, Yuning Zhang
Chaotic oscillation of bubbles in liquids reduces the efficiency of the sonochemical system and should be suppressed in the practical applications. In the present paper, a chaos control method based on the dual-frequency approach is numerically investigated and is proved to be an effective method even for cases with intensive energy input. It was found that the chaos could be successfully suppressed by the application of dual-frequency approach in a wide range of parameter zone (even with high acoustic pressure amplitude)...
April 9, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28434879/sonoluminescence-and-acoustic-emission-spectra-at-different-stages-of-cavitation-zone-development
#6
N V Dezhkunov, A Francescutto, L Serpe, R Canaparo, G Cravotto
The way in which a cavitation zone develops in a focused pulsed ultrasound field is studied in this work. Sonoluminescence (SL), total hydrophone output and cavitation noise spectra have been recorded across a gradual, smooth increase in applied voltage. It is shown that the cavitation zone passes through a number of stages of evolution, according to increasing ultrasound intensity, decreasing pulse period and increasing ultrasound pulse duration. Sonoluminescence is absent in the first phase and the hydrophone output spectra consists of a main line with two or three harmonics whose intensity is much lower than that of the main (fundamental) line...
April 6, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28433504/intensification-of-ultrasonic-assisted-crude-oil-demulsification-based-on-acoustic-field-distribution-data
#7
Matheus F Pedrotti, Michele S P Enders, Leticia S F Pereira, Marcia F Mesko, Erico M M Flores, Cezar A Bizzi
Water removal is an essential step during crude oil production due to several problems such as increased transportation costs and high corrosion rate due to dissolved salts. Indirect low frequency ultrasonic energy (US), using baths, has been recently proposed as an effective alternative for crude oil demulsification. However, the reactor position during sonication and its influence on the demulsification efficiency for crude oil has not been evaluated. In this sense, the aim of this study was to develop an automated system based on an open source hardware for mapping the acoustic field distribution in an US bath operating at 35kHz using a hydrophone...
April 2, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28389057/acoustic-wave-propagation-in-bubbly-flow-with-gas-vapor-or-their-mixtures
#8
Yuning Zhang, Zhongyu Guo, Yuhang Gao, Xiaoze Du
Presence of bubbles in liquids could significantly alter the acoustic waves in terms of wave speed and attenuation. In the present paper, acoustic wave propagation in bubbly flows with gas, vapor and gas/vapor mixtures is theoretically investigated in a wide range of parameters (including frequency, bubble radius, void fraction, and vapor mass fraction). Our finding reveals two types of wave propagation behavior depending on the vapor mass fraction. Furthermore, the minimum wave speed (required for the closure of cavitation modelling in the sonochemical reactor design) is analyzed and the influences of paramount parameters on it are quantitatively discussed...
March 29, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28411065/modifying-the-physicochemical-properties-of-pea-protein-by-ph-shifting-and-ultrasound-combined-treatments
#9
Shanshan Jiang, Junzhou Ding, Juan Andrade, Taha M Rababah, Ali Almajwal, Mahmoud M Abulmeaty, Hao Feng
The effect of a pH-shifting and ultrasound combined process on the functional properties and structure of pea protein isolate (PPI) was investigated. PPI dispersions were adjusted to pH 2, 4, 10, or 12, treated by power ultrasound for 5min, and incubated for 1h before the sample pH was brought back to neutral. After treatment, water solubility, protein aggregate size, solution turbidity, surface hydrophobicity (Ho), free sulfhydryl content (SH), and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) of the soluble PPI were determined...
March 28, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28377103/is-reproducibility-inside-the-bag-special-issue-fundamentals-and-applications-of-sonochemistry-ess-15
#10
Filipe Gomes, Harsh Thakkar, Anna Lähde, Bram Verhaagen, Aniruddha B Pandit, David Fernández Rivas
In this paper we report our most recent attempts to tackle a notorious problem across several scientific activities from the ultrasonics sonochemical perspective: reproducibility of results. We provide experimental results carried out in three different laboratories, using the same ingredients: ultrasound and a novel cavitation reactor bag. The main difference between the experiments is that they are aimed at different applications, KI liberation and MB degradation; and exfoliation of two nanomaterials: graphene and molybdenum disulfide...
March 24, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28341331/how-sonochemistry-contributes-to-green-chemistry
#11
Gregory Chatel
Based on the analyses of papers from the literature, and especially those published in Ultrasonics Sonochemistry journal, the contribution of sonochemistry to green chemistry area has been discussed here. Important reminders and insights on the good practices and considerations have been made to understand and demonstrate how sonochemistry can continue to efficiently contribute to green chemistry area in the further studies.
March 15, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28359634/synthesis-of-sub-micronic-and-nanometric-pmma-particles-via-emulsion-polymerization-assisted-by-ultrasound-process-flow-sheet-and-characterization
#12
L Baissac, C C Buron, L Hallez, P Berçot, J-Y Hihn, L Chantegrel, G Gosse
PMMA particle synthesis was performed from MMA (methyl methacrylate) and water mixtures, exposed to different ultrasonic systems and frequencies. The sonication sequence was 20kHz→580kHz→858kHz→1138kHz, and the solution was sampled after each irradiation step for polymerization. Effects of sonication parameters (time, power), polymerization method (thermo-initiated or photo-initiated), use of small amounts of surfactant (Triton X-100™ or Tween® 20) and initial MMA quantity were investigated on particle size and synthesis yields...
March 14, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28325652/effect-of-ultrasound-on-silver-electrodeposition-crystalline-structure-modification
#13
Aymeric Nevers, Loïc Hallez, Francis Touyeras, Jean-Yves Hihn
An attractive possibility for influencing microstructures of electrodeposited coatings, and therefore their properties such as hardness, brightness etc. resides in the use of ultrasound. This method is particularly competitive as it may result in a reduction of chemical use, or even in the complete suppression of chemicals. This paper deals with silver coatings depending strongly on current density, with two main categories identified by X-ray diffraction: one poorly structured and the other following the [110] orientation...
February 27, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427687/improved-adsorption-performance-of-nanostructured-composite-by-ultrasonic-wave-optimization-through-response-surface-methodology-isotherm-and-kinetic-studies
#14
Mehdi Dastkhoon, Mehrorang Ghaedi, Arash Asfaram, Alireza Goudarzi, Seyyedeh Maryam Mohammadi, Shaobin Wang
In this work, ultrasound-assisted adsorption of an anionic dye, sunset yellow (SY) and cationic dyes, malachite green (MG), methylene blue (MB) and their ternary dye solutions onto Cu@ Mn-ZnS-NPs-AC from water aqueous was optimized by response surface methodology (RSM) using the central composite design (CCD). The adsorbent was characterized using Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX) and EDX mapping images. The effects of various parameters such as pH, sonication time, adsorbent mass and initial concentrations of SY, MG and MB were examined...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427686/ultrasound-assisted-acid-catalyzed-lactose-hydrolysis-understanding-into-effect-of-operating-parameters-and-scale-up-studies
#15
Chinmay N Gajendragadkar, Parag R Gogate
The current work deals with the value addition of lactose by transforming into hydrolyzed lactose syrup containing glucose and galactose in major proportion using the novel approach of ultrasound assisted acid catalyzed lactose hydrolysis. The hydrolysis of lactose was performed in ultrasonic bath (33kHz) at 50% duty cycle at different temperatures as 65°C and 70°C and two different hydrochloric acid (HCl) concentrations as 2.5N and 3N. It was observed that acid concentration, temperature and ultrasonic treatment were the major factors in deciding the time required to achieve ∼90% hydrolysis...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427685/fe3o4-hydroxyapatite-graphene-quantum-dots-as-a-novel-nano-sorbent-for-preconcentration-of-copper-residue-in-thai-food-ingredients-optimization-of-ultrasound-assisted-magnetic-solid-phase-extraction
#16
Phitchan Sricharoen, Nunticha Limchoowong, Yonrapach Areerob, Prawit Nuengmatcha, Suchila Techawongstien, Saksit Chanthai
Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called "Tom Yum Kung") prior to determination by inductively coupled plasma-atomic emission spectrometry...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427684/rapid-and-high-capacity-ultrasonic-assisted-adsorption-of-ternary-toxic-anionic-dyes-onto-mof-5-activated-carbon-artificial-neural-networks-partial-least-squares-desirability-function-and-isotherm-and-kinetic-study
#17
Hanieh Askari, Mehrorang Ghaedi, Kheibar Dashtian, Mohammad Hossein Ahmadi Azghandi
The present paper focused on the ultrasonic assisted simultaneous removal of fast green (FG), eosin Y (EY) and quinine yellow (QY) from aqueous media following using MOF-5 as a metal organic framework and activated carbon hybrid (AC-MOF-5). The structure and morphology of AC-MOF-5 was identified by SEM, FTIR and XRD analysis. The interactive and main effects of variables such as pH, initial dyes concentration (mgL(-1)), adsorbent dosage (mg) and sonication time (min) on removal percentage were studied by central composite design (CCD), subsequent desirability function (DF) permit to achieved real variable experimental condition...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427683/editorial-note
#18
EDITORIAL
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No abstract text is available yet for this article.
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427682/effects-and-mechanism-of-diclofenac-degradation-in-aqueous-solution-by-us-zn-0
#19
Ting Huang, Guangming Zhang, Shan Chong, Yucan Liu, Nan Zhang, Shunyan Fang, Jia Zhu
A system of ultrasound radiation coupled with Zn(0) was applied to degrade diclofenac. The effects of initial pH, dosage of Zn(0) and ultrasound density were investigated. To further explore the mechanism of the microcosmic reaction, the fresh and used Zn(0) powders were characterized by SEM, XRD and XPS. Radical scavengers were used to determine the oxidation performance of strong oxidizing free radicals on diclofenac, including hydroxyl radicals and superoxide radicals. The results showed that the optimum removal of diclofenac reached to over 85% at pH of 2...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427681/sonochemical-assisted-synthesis-of-rgo-zno-nanowire-arrays-for-photoelectrochemical-water-splitting
#20
Ibrahim Khan, Akram A M Ibrahim, Manzar Sohail, Ahsanulhaq Qurashi
This article presented the synthesis of a hybrid nanoarchitecture material composed of reduced graphene oxide (RGO) multiple sheets and ZnO nanowire arrays (NWAs) formed on an arbitrary ZnO coated fluorine doped tin oxide (FTO) substrates via pulse sonication and hydrothermal approach. The NWAs have high aspect-ratio, high density, apt positioning and well-ordered formation. FESEM images demonstrated that RGO layers have been effectively intercalated between and on the accessible surfaces of the ZnO NWAs. The diameter of ZnO nanowires is 80-150nm and length about 1-2μm...
July 2017: Ultrasonics Sonochemistry
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