Influence of pressure on ultrasonic cavitation activity in room temperature ionic liquids: An electrochemical study

Naidji, Bouzid; Hallez, L.; Taouil, A. Et; Rebetez, M.; Hihn, Jean‐Yves

doi:10.1016/j.ultsonch.2019.02.007

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…As shown in our previous study [21] , the use of room temperature ionic liquids (RTILs) has shed light on new possibilities. The low volatility of these solvents associated with control of dissolved gases have critical effects on cavitation activity.…”

Section: Introductionmentioning

confidence: 94%

“…A variety of characterization methods have been used: electrochemistry, contact angle measurements, X-ray photoelectron spectroscopy (XPS), and phase modulation - infrared reflection absorption spectroscopy (PM-IRRAS). As detailed in our previous work [21] , cavitation activity is quantified through 2 indicators, both extracted from electrochemical measurements (polarization curves): Sherwood number (Sh) and average of current density variation (|Δj| average ). Sh is a dimensionless number that is extracted from the steady-state component of polarization curves and permits characterization of mass transfer efficiency independently from parameters inherent to electrochemical system.…”

Section: Introductionmentioning

confidence: 99%

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Effect of cavitation intensity control on self-assembling of alkanethiols on gold in room temperature ionic liquids

Naidji

Hallez

Taouil

et al. 2021

Ultrasonics Sonochemistry

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Highlights Ionic liquids were used to sonicate a “non vapor” media. In absence of vapor, cavitation is controlled by gas pressure. Cavitation influences orientation and organization of self-assembled monolayers. Chemical adsorption of molecules is highly activated by cavitation. Chemical adsorption of molecules is not dependent on cavitation intensity.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effect of cavitation intensity control on self-assembling of alkanethiols on gold in room temperature ionic liquids

Naidji

Hallez

Taouil

et al. 2021

Ultrasonics Sonochemistry

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“…Ionic liquids have low volatility, and due to this condition, cavitation in these media depends on the presence of dissolved gases. Naidji et al (2019) developed a specific sonoelectrochemical cell to investigate the effect of pressure on ultrasonic cavitation. The results showed that the cavitation activity decreased considerably from atmospheric pressure to about 26 kPa above atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

Comparison between effects of manothermosonication and isolated ultrasonic techniques on microbial inactivation of a hospital laundry effluent

Filho

Silva

Araújo

et al. 2022

RSD

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Microbial inactivation using only Ultrasound (US) vibrations presents considerable advantages by applying green techniques with non-generation of greenhouse gases, eliminating chemicals, and operating conditions close to environmental conditions. However, industrial effluent treatment systems have been investigated as a microbial inactivation step, using isolated US associated with thermal (T) and manometric (P) microbial inactivation techniques. A stainless-steel bench prototype was built for the present study, operating in continuous mode, with a 2.5 L volume test chamber. The indicator microorganism detected in the effluent of a hospital laundry located in the Agreste region of the state of Pernambuco, Brazil, was the E. coli bacterium. In addition to the isolated US effect, US/T, US/P, and US/T/P combinations were obtained using a central composite design (CCD). The factors used for the CCD were frequency, hydraulic detention time, temperature, and pressure. The results showed that the lethality rate increased with the frequency and time of hydraulic detention but was reduced when increasing temperature from 30°C to 50°C and increasing pressure between 1.0 bar and 1.8 bar. Isolated ultrasonic vibrations, at 120 kHz and with 10-minute HRT, reached an inactivation efficiency of 98%. Such a value was found using the thermomannosonic condition around 40 min. The use of the isolated US vibration technique proved advantageous, mainly due to the efficient inactivation results and potential energy and chemical reductions.

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“…Cavitation disinfection of water, which consists of the processes of microorganisms destruction by ultrasonic radiation, is explained by cavitation processes, which include the formation, growth, and collapse in the liquid of pulsating cavitation bubbles filled with gas, steam, or their mixture. 1,2 The pressure that occurs inside these cavities during their formation is very small when compared to the pressure in the liquid itself. As a result, the liquid and the gases dissolved in it are sent to the center of the bubble.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Defective TiO2-x for Water Treatment/Methyl Orange Dye Degradation

Ali¹,

Mohammed²,

Al-Dokheily³

et al. 2022

ChChT

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This study is designed to highlight photocatalytic activity of TiO2 nanoparticles in methyl orange (MO) dye degradation. Titanium dioxide TiO2 nanopowder was synthesized by conventional sol-gel method and calcined in air atmosphere at different temperatures 350C, 550C and 850C. The prepared TiO2 nanoparticles then were subjected to a solid state reaction with calcium hydride (CaH2) at the same temperatures but calcined in argon atmosphere. X-Ray Diffraction (XRD) measurements used for phase and crystalline size identification showed that the obtained samples have the same TiO2 anatase phase, but the crystalline size decreased after reduction treatment. The electronic properties obtained via UV spectroscopy showed the decrease in calculated energy gap from 3.3 eV for prepared TiO2-550 to 2.65 eV for reduced TiO2-CaH2-550, which extend the absorption spectra toward visible light region. Energy dispersive spectroscopy (EDS) and scanning electron microscope (SEM) measurements revealed that the particle size decreased after reduction treatment similar to the XRD crystalline size. EDS results indicated that the deficient in oxygen content relates to formation oxygen vacancies responsible for nonstoichiometric TiO2-x oxides formation. The synthesized reduced TiO2 showed an excellent photo-catalytic activity in methyl orange dye degradation under optimum condition: pH 4.5, 40 mg catalyst loading and 10 ppm initial dye concentration.

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Influence of pressure on ultrasonic cavitation activity in room temperature ionic liquids: An electrochemical study

Cited by 10 publications

References 24 publications

Effect of cavitation intensity control on self-assembling of alkanethiols on gold in room temperature ionic liquids

Effect of cavitation intensity control on self-assembling of alkanethiols on gold in room temperature ionic liquids

Comparison between effects of manothermosonication and isolated ultrasonic techniques on microbial inactivation of a hospital laundry effluent

Photocatalytic Activity of Defective TiO2-x for Water Treatment/Methyl Orange Dye Degradation

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