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sonocatalytic degradation of methyl orange in the presence of (nanometer and ordinary) anatase TiO_2 powders

Journal of Environmental Sciences 2005年第3期17卷 414-418页

作者： WANGJun GUOBao-dong ZHANGZhao-hong ZHANGXiang-dong WUJing LIHong DepartmentofChemistry LiaoningUniversityShenyang110036China

The nanometer and ordinary anatase titanium dioxide(TiO_2) powders were adopted as the sonocatalysts for the degradation of methyl orange used as a model compound for the first time. It was found that the sonocatalytic degradation effect of methyl orange in the presence of TiO_2 powder were much better than that without TiO_2, but the sonocatalytic activity of the nanometer anatase TiO_2 particle was obviously higher than that of ordinary anatase TiO_2 particle. Although there are many factors influencing sonocatalytic degradation of methyl orange, the experimental results showed that the best degradation ratio of methyl orange could be obtained when the experimental conditions were: initial concentration 15 mg/L, nanometer anatase TiO_2 adding amount 750 mg/L, ultrasonic frequency 40 kHz, output power 50 W, pH = 3.0 and temperature 40℃ within 150 min. In addition, the catalytic activity of reused nanometer anatase TiO_2 catalyst was also studied and found to decline gradually comparing with initial nanometer anatase TiO_2 catalyst. All experiments indicated that the method of the sonocatalytic degradation of organic pollutants in the presence of TiO_2 powder was an advisable choice for non- or low-transparent organic wastewaters.

关键词： titanium dioxide(TiO_2) sonocatalytic degradation methyl orange nanometer anatase ordinary anatase

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Ultrasonic enhancement of persulfate oxidation system governs emerging pollutants decontamination

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GREEN ENERGY & ENVIRONMENT 2024年第11期9卷 1666-1678页

作者： Li, Yanpan Zhou, Yanbo Zhou, Yi East China Univ Sci & Technol Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou State Environm Protect Key Lab Environm Risk Asses 130 Meilong Rd Shanghai 200237 Peoples R China East China Univ Sci & Technol Shanghai Engn Res Ctr Multimedia Environm Catalysi 130 Meilong Rd Shanghai 200237 Peoples R China Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China

Emerging contaminants (ECs) are widely present in aquatic environments, posing potential risks to both ecosystems and human health. The ultrasound-assisted persulfate oxidation process has attracted considerable attention in the degradation of ECs due to its ability to generate both sulfate radicals and cavitation effects, enhancing degradation effects. In this paper, the principle of ultrasonic synergistic Fenton-like oxidation system for degrading organic pollutants was reviewed, divided into homogeneous system, non-homogeneous system, and single-atom system to explore the synergistic effect of ultrasound-enhanced persulfate technology in three aspects, and the effects of environmental factors such as ultrasonic frequency and power, system pH, temperature, and initial oxidant concentration on the system's decontamination performance were discussed. Finally, future research on ultrasonically activated persulfate technology is summarized and prospected. (c) 2024 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Ultrasound Persulfate Emerging contaminants Reaction mechanism Synergistic effects NAPHTHOL BLUE BLACK sonocatalytic degradation ACTIVATED PERSULFATE WASTE-WATER SONOCHEMICAL degradation REMOVAL NANOPARTICLES KINETICS PEROXYMONOSULFATE NANOCOMPOSITE

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超声辅助法合成的石墨烯-TiO_2复合材料声催化降解罗丹明B(英文)

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催化学报 2012年第8期33卷 1276-1283页

作者： Trisha GHOSH Chong-Yeon PARK OH Won-Chun Department of Advanced Materials Science & Engineering Hanseo UniversityChungnam 356-706Korea

A series of graphene-TiO2 composites was fabricated from graphene oxide and titanium n-butoxide(TNB) by an ultrasonic-assisted *** structure and composition of the nanocomposites were characterized by Raman spectroscopy,BET surface area measurements,X-ray diffraction,transmission electron microscopy,and ultraviolet-visible absorption *** average size of the TiO2 nanoparticles on the graphene nanosheets was controlled at around 10-15 nm without using surfactant,which is attributed to the pyrolysis and condensation of dissolved TNB into TiO2 by ultrasonic *** catalytic activity of the composites under ultrasonic irradiation was determined using a rhodamine B(RhB) *** graphene-TiO2 composites possessed a high specific surface area,which increased the decolorization rate for RhB *** is because the graphene and TiO2 nanoparticles in the composites interact strongly,which enhances the photoelectric conversion of TiO2 by reducing the recombination of photogenerated electron-hole pairs.

关键词： grapheme ultrasonication sonocatalytic degradation adsorption rhodamine B

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