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Degradation of Reactive Yellow 86 with photo-Fenton process driven by solar light

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Journal of Environmental Sciences 2010年第9期22卷 1455-1461页

作者： Hideyuki katsumata Syunya Koike Satoshi Kaneco Tohru Suzuki Kiyohisa Ohta Department of Chemistry for Materials Graduate School of EngineeringMie UniversityTsu Environmental Preservation Center Mie UniversityTsu

The decolorization of Reactive Yellow 86 （RY 86）, one of reactive azo dyes, was investigated in the presence of Fenton reagent under solar light irradiation. The decolorization rate was strongly influenced by pH, initial concentrations of H202 and Fe（II）, and so on. An initial concentration of 40 mg/L was decolored more than 90% after 20 min under optimum conditions. The activation energy of the solar photo-Fenton reaction was 1.50 kJ/mol for RY 86 in the temperature range of 10-60℃. In the kinetic study, the rate constant of RY 86 with OH- radicals could be estimated to be 1.7 × 10^10 L/（***）. The decolorization efficiency of RY 86 under solar light irradiation was comparable to the artificial light irradiation. The decrease of TOC as a result of mineralization of RY 86 was observed during photo-Fenton process. The rate of RY 86 mineralization was about 83% under UV irradiation after 24 hr. The formation of chloride, sulfate, nitrate and ammonium ions as end-products was observed during the photocatalytic process. The decomposition of RY 86 gave two kinds of intermediate products. The degradation mechanism of RY 86 was proposed on the base of the identified intermediates.

关键词： reactive azo dye photo-Fenton reaction solar light irradiation decolorization mineralization

Determination of Intraseasonal Variation of Precipitation Microphysics in the Southern Indian Ocean from Joss–Waldvogel Disdrometer Observation during the CINDY Field Campaign

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Advances in Atmospheric Sciences 2018年第11期35卷 1415-1427页

作者： MARZUKI Hiroyuki HASHIGUCHI Mutya VONNISA HARMADI Masaki katsumata Department of Physics Andalas UniversityPadang 25163Indonesia Research Institute for Sustainable Humanosphere Kyoto UniversityKyoto 611-0011Japan Japan Agency for Marine-Earth Science and Technology Yokosuka 237-0061Japan

To date, the intraseasonal variation of raindrop size distribution(DSD) in response to the Madden–Julian Oscillation(MJO) has been examined only over the Indonesian Maritime Continent, particularly in Sumatra. This paper presents the intraseasonal variation of DSD over the Indian Ocean during the Cooperative Indian Ocean experiment on Intraseasonal Variability in the Year 2011(CINDY 2011) field campaign. The DSDs determined using a Joss–Waldvogel disdrometer,which was installed on the roof of the anti-rolling system of the R/V Mirai during stationary observation(25 September to 30 November 2011) at(8°S, 80.5°E), were analyzed. The vertical structure of precipitation was revealed by Tropical Rainfall Measuring Mission Precipitation Radar(version 7) data. While the general features of vertical structures of precipitation observed during the CINDY and Sumatra observation are similar, the intraseasonal variation of the DSD in response to the MJO at each location is slightly different. The DSDs during the active phase of the MJO are slightly broader than those during the inactive phase, which is indicated by a larger mass-weighted mean diameter value. Furthermore, the radar reflectivity during the active MJO phase is greater than that during the inactive phase at the same rainfall rate. The microphysical processes that generate large-sized drops over the ocean appear to be more dominant during the active MJO phase, in contrast to the observations made on land(Sumatra). This finding is consistent with the characteristics of radar reflectivity below the freezing level, storm height, bright band height, cloud effective radius, and aerosol optical depth.

关键词： DSD(raindrop size distribution) MJO(Madden–Julian Oscillation) Indian Ocean CINDY

Enhanced hydrogen production from aqueous methanol solution using TiO2/Cu as photocatalysts

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Frontiers of Chemical Science and Engineering 2014年第2期8卷 197-202页

作者： Paramasivan GOMATHISANKAR Tomoko NODA Hideyuki katsumata Tohru SUZUKI Satoshi KANECO Department of Chemistry for Materials Graduate School of Engineering Mie University Mie 514-8507 Japan Environmental Preservation Center Mie University Mie 514-8507 Japan

The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide （TiO2） was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that only the addition of copper particles enhances the hydrogen production. The copper usage and reaction temperature were further optimized for TiO2/Cu photocatalyts. Under the optimal conditions, the hydrogen production using TiO2/Cu as photocatalysts is approxi- mately 68 times higher than that obtained with only TiO2.

关键词： photocatalytic hydrogen generation metha-nol copper particles TiO2 metal-semiconductor interface

Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO_2 in the presence of hole scavengers

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Chinese Journal of Chemical Engineering 2018年第3期26卷 529-533页

作者： Abdus Samad Shamim Ahsan Ikki Tateishi Mai Furukawa Hideyuki katsumata Tohru Suzuki Satoshi Kaneco Department of Chemistry Jagannath University Department of Earth and Atmospheric Sciences Metropolitan State University of Denver Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Global Environment Center for Education & Research Mie University

The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide(TiO_2)was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone,formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO_2 was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO_2 photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·OH with hole scavenger.

关键词： Indirect photocatalytic reduction Arsenate Arsenite Titanium dioxide Hole scavenger

Determination of aniline derivatives in water samples after preconcentration with oxidized multiwalled carbon nanotubes as solid-phase extraction disk

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Frontiers of Chemical Science and Engineering 2012年第3期6卷 270-275页

作者： Hideyuki katsumata Yuta ODA Satoshi KANECO Tohru SUZUKI Kiyohisa OHTA Department of Chemistry for Materials Graduate School of Engineering Mie University Tsu 514-8507 Japan Environmental Preservation Center Mie University Tsu 514-8507 Japan

A sensitive and selective preconcentration method using solid-phase extraction （SPE） disk made from oxidized multiwalled carbon nanotubes （OMWCNTs）, has been developed for the determination of aniline derivatives, such as 2-nitroaniline （2-NA）, 4- nitroaniline （4-NA）, and 2,4-dichloroaniline （2,4-DCA） in water samples. Anilines were extracted onto OMWCNT disk and then determined by high performance liquid chromatography （HPLC） with UV detector. Several parameters on the recovery of the analytes were investigated. The experimental results showed that it was possible to obtain quantitative analysis when the solution pH was 8 using 200 mL of validation solution containing 2 ug of anilines and 10 mL of acetonitrile/ethanol （8/2, v/v） as an eluent. Relative standard deviations for five determinations were 7.5% （2-NA）, 6.5% （4-NA） and 3.8% （2,4-DCA） under optimum conditions. The linear range of calibration curves were 0.5 *** 1 to 15 ***-1 for each analyte with good correlation coefficients. The detection limits （3S/N） of 2-NA, 4-NA and 31 *** -1 and 26 ***-1 was successfully applied to 2,4-DCA were *** -1, respectively. Our method the determination of aniline compounds in fiver water sample with high precision and accuracy.

关键词： aniline determination solid-phase extraction,oxidized multiwalled carbon nanotubes water sample,HPLC-UV

Water purification with sintered porous materials fabricated at 400℃ from sea bottom sediments

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Journal of Environmental Sciences 2008年第2期20卷 172-176页

作者： DABWAN Ahmed H A IMAI Daizo KANECO Satoshi SENMATSU Isamu NAKAHAMA Katsuyuki katsumata Hideyuki SUZUKI Tohru OHTA Kiyohisa Mie Industry and Enterprise Support Center ShimaMie 517-0501Japan Mie Industry and Enterprise Support Center ShimaMie 517-0501Japan Department of Chemistry for MaterialsGraduate School of EngineeringMie UniversityMie 514-8507Japan. Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan. Environmental Preservation Center Mie UniversityMie 514-8507Japan Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan. Environmental Preservation CenterMie UniversityMie 514-8507Japan

A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sediments dredged from Ago Bay into value-added recycled products. The sintered products fabricated at 400℃ were found to be very effective adsorbents for the removal of heavy metals.

关键词： sintering preparation technology porous materials sea bottom sediments water purification heavy metals

Complete laparoscopic resection of the rectum using natural orifice specimen extraction

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World Journal of Gastroenterology 2014年第44期20卷 16707-16713页

作者： Masayuki Hisada Kenji katsumata Tetsuo Ishizaki Masanobu Enomoto Takaaki Matsudo Kazuhiko Kasuya Akihiko Tsuchida Department of Digestive Surgery and Pediatric Surgery Tokyo Medical University

AIM: To investigate how complete laparoscopic anterior resection with natural orifice specimen extraction (NOSE), as a novel minimally invasive surgery, compares to conventional laparoscopic surgery.

关键词： Complete laparoscopic surgery Incisionless surgery Natural orifice specimen extraction Transanal specimen extraction Less invasive surgery

Beijing Review Observer:Japan’s Incredible Calmness and Strength OVERCOMING A CATACLYSM The Japanese begin to put their shattered economy back on track

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Beijing Review 2011年第13期54卷 10-17页

作者： AYAKO katsumata

Earthquake,tsunami,nuclear plantb *** is a major catast *** Japan has been hit by all of ***,economic losses,release of *** is a huge *** Japan must face all *** will Japan respond to the domino-like disaster

关键词： In Beijing Review Observer:Japan’s Incredible Calmness and Strength OVERCOMING A CATACLYSM The Japanese begin to put their shattered economy back on track www

Simultaneous removal of trihalomethanes by bimetallic Ag/Zn:kinetics study

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Frontiers of Chemical Science and Engineering 2010年第3期4卷 322-327页

作者： Ahmed H A DABWAN Satoshi KANECO Hideyuki katsumata Tohru SUZUKI Kiyoyuki EGUSA Kiyohisa OHTA Faculty of Chemical Engineering Technology Tati University CollegeJalan PanchorTeluk Kalong24000 KemamanTerengganuMalaysia Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan Environmental Preservation Center Mie UniversityMie 514-8507Japan

In the present work,bimetallic silver/zinc was applied into the degradation of trihalomethanes,THMs:CHCl_(3),CHBrCl_(2),CHBr_(2)Cl,and CHBr_(3).The kinetics reaction rates and removal efficiencies of the THM compound mixtures,in the aqueous solutions,were *** experiments were conducted under mild conditions,ambient temperature,and *** primary degradation reaction followed a pseudo-first-order kinetic *** first-order rate constants and the degradation efficiencies followed the decreasing order of CHBr_(3)>CHBr_(2)Cl>CHBrCl_(2)>CHCl_(3).The bond dissociation energy and hydrophilic/hydrophobic characteristics of the THM compounds may become the most important parameters affecting the degradation kinetics and efficiency by bimetallic Ag/Zn.

关键词： degradation trihalomethanes bimetallic silver/zinc halogenated pollutants kinetics