Search Results - "OKITSU, Kenji"

Formation of NO2− and NO3− in the sonolysis of water: Temperature- and pressure-dependent reactions in collapsing air bubbles by Okitsu, Kenji, Itano, Yasuyuki

“…[Display omitted] •Effect of high-temperature and high-pressure on N2 oxidation reactions was discussed.•Chemical equilibrium calculations were performed to…”
Get full text

Synthesis of Au nanorods via autocatalytic growth of Au seeds formed by sonochemical reduction of Au(I): Relation between formation rate and characteristic of Au nanorods by Okitsu, Kenji, Semboshi, Satoshi

“…•Yield, size, and shape of Au nanorods were evaluated by UV–vis and TEM analysis.•Characteristics of Au nanorods depended on ultrasonic irradiation…”
Get full text

Evaluation of H2O2, H2, and bubble temperature in the sonolysis of water and aqueous t-butanol solution under Ar: Effects of solution temperatures and inorganic additives of NaCl and KI by Nakata, Yuki, Mizukoshi, Yoshiteru, Okitsu, Kenji

“…The yields of H2O2 and H2 formed in the sonolysis of aqueous solution under noble gas are representative indexes for understanding the chemical effects of…”
Get full text

Quantitation and evaluation of NO2−, NO3−, and H2O2 in the sonolysis of aqueous NaOH solution under air and air-Ar mixture: Effects of solution temperature, ultrasonic power, and ratio of gas mixture by Okitsu, Kenji, Kunichika, Riki, Asada, Shota

“…•Actual yield of NO2-, NO3-, and H2O2 was measured in the presence of NaOH.•Effects of solution temperature, ultrasonic power, and gas mixture were…”
Get full text

Facile fabrication of SnO2 modified hierarchical BiOI S-scheme heterojunction photocatalyst with efficient activity for carbon dioxide reduction by Xiao, Yunxue, Abulizi, Abulikemu, Okitsu, Kenji, Ren, Tiezhen

“…[Display omitted] The use of photocatalysts on semiconductor substrates is a promising strategy for multiple use of solar energy and environmental improvement…”
Get full text

Sonochemical degradation of surfactants with different charge types: Effect of the critical micelle concentration in the interfacial region of the cavity by Nanzai, Ben, Suzuki, Seiya, Okitsu, Kenji

“…[Display omitted] •Sonolysis of surfactants with different charge types show a maximum degradation rate.•Maximum degradation rate can be linearly correlated…”
Get full text

Development of a Photometric Method to Measure Molecular Oxygen in Water by DANG, Tu, KAWAGISHI, Hiroto, FUJII, Yusuke, OKITSU, Kenji, MAEDA, Yasuaki, TAKENAKA, Norimichi

“…A photometric method to determine molecular oxygen in water was developed. When manganese(II) is oxidized by oxygen under alkaline conditions, the presence of…”
Get full text

Sonochemical Synthesis of Gold Nanoparticles:  Effects of Ultrasound Frequency by Okitsu, Kenji, Ashokkumar, Muthupandian, Grieser, Franz

“…The rate of sonochemical reduction of Au(III) to produce Au nanoparticles in aqueous solutions containing 1-propanol has been found to be strongly dependent…”
Get full text

Ultrasound-assisted production of biodiesel fuel from vegetable oils in a small scale circulation process by Thanh, Le Tu, Okitsu, Kenji, Sadanaga, Yasuhiro, Takenaka, Norimichi, Maeda, Yasuaki, Bandow, Hiroshi

“…Biodiesel production from canola oil with methanol was performed in the presence of a base-catalyst by a circulation process at room temperature. In this…”
Get full text

In-situ fabrication of hollow BiOIxCly n-n type heterojunction microspheres with enhanced visible-light-driven performance for rhodamine B degradation and CO2 reduction by Fu, Hongyu, Zhang, Tao, Abulizi, Abulikemu, Okitsu, Kenji, Tursun, Yalkunjan

“…[Display omitted] •Hollow BiOIxCly n-n type heterojunction microspheres photocatalysts were successfully synthesized.•The photocatalyst exhibited much higher…”
Get full text

Ultrasound assisted reduction of graphene oxide to graphene in l-ascorbic acid aqueous solutions: Kinetics and effects of various factors on the rate of graphene formation by Abulizi, Abulikemu, Okitsu, Kenji, Zhu, Jun-Jie

“…•Reduction of GO to rGO was accelerated by 20kHz ultrasound irradiation.•High power ultrasound and long pulse mode enhanced the rate of rGO formation.•High…”
Get full text

One-Pot Synthesis of Gold Nanorods by Ultrasonic Irradiation: The Effect of pH on the Shape of the Gold Nanorods and Nanoparticles by Okitsu, Kenji, Sharyo, Kohei, Nishimura, Rokuro

“…A novel one-pot synthesis method to prepare gold nanorods was developed by using sonochemical reduction of gold ions in aqueous solution. The size of the…”
Get full text

A two-step continuous ultrasound assisted production of biodiesel fuel from waste cooking oils: A practical and economical approach to produce high quality biodiesel fuel by Thanh, Le Tu, Okitsu, Kenji, Sadanaga, Yasuhiro, Takenaka, Norimichi, Maeda, Yasuaki, Bandow, Hiroshi

“…A transesterification reaction of waste cooking oils (WCO) with methanol in the presence of a potassium hydroxide catalyst was performed in a continuous…”
Get full text

A new co-solvent method for the green production of biodiesel fuel – Optimization and practical application by Thanh, Le Tu, Okitsu, Kenji, Sadanaga, Yasuhiro, Takenaka, Norimichi, Maeda, Yasuaki, Bandow, Hiroshi

“…► The transesterification reaction can be performed at room temperature (25±1°C). ► Reduced time for separation of glycerin (within 30min after reaction…”
Get full text

Catalytic Technologies for Biodiesel Fuel Production and Utilization of Glycerol: A Review by Yasuaki Maeda, Luu Van Boi, Kenji Okitsu, Le Tu Thanh

“…More than 10 million tons of biodiesel fuel (BDF) have been produced in the world from the transesterification of vegetable oil with methanol by using acid…”
Get full text

One-pot synthesis of gold nanorods via autocatalytic growth of sonochemically formed gold seeds: The effect of irradiation time on the formation of seeds and nanorods by OKITSU, Kenji, NUNOTA, Yuho

“…A one-pot synthesis for gold nanorods was developed using sonochemical reduction of gold ions in an aqueous solution in the presence of cetyltrimethylammonium…”
Get full text

Sonochemical Decomposition of Perfluorooctane Sulfonate and Perfluorooctanoic Acid by Moriwaki, Hiroshi, Takagi, Youichi, Tanaka, Masanobu, Tsuruho, Kenshiro, Okitsu, Kenji, Maeda, Yasuaki

“…Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are shown to be globally distributed, environmentally persistent, and bioaccumulative…”
Get full text

Effects of Na2SO4 or NaCl on sonochemical degradation of phenolic compounds in an aqueous solution under Ar: Positive and negative effects induced by the presence of salts by Uddin, Md. Helal, Nanzai, Ben, Okitsu, Kenji

“…•Effect of Na2SO4 or NaCl on the sonochemical degradation was investigated.•Rates of degradation were 4-chlorophenol>phenol>catechol>resorcinol.•Addition of…”
Get full text

Ultrasound Assisted Cascade Extraction of Oil, Vitamin E, and Saccharides from Roselle (Hibiscus Sabdariffa L.) Seeds by LE, Bang Anh, OKITSU, Kenji, IMAMURA, Kiyoshi, TAKENAKA, Norimichi, MAEDA, Yasuaki

“…Roselle seeds, a waste biomass of the roselle calyx processing industry, were utilized to recover valuable compounds of oil, vitamin E, and water-soluble…”
Get full text

Comparison of reductive nanoparticle preparation using plasma and ultrasound irradiation in aqueous solution by Mizukoshi, Yoshiteru, Hori, Fuminobu, Okitsu, Kenji

“…In this review, reductive nanoparticle preparation using plasma generated in aqueous solutions is described. The reduction mechanism of Au(III) ions and the…”
Get full text