in this work firstly fe3o4 nanoparticles were synthesized via a sono-chemical method. at the second step magnesium hydroxide shell was synthesized on the magnetite-core under ultrasonic waves. for preparation fe3o4-mgo the product was calcinated at 400 ºc for 2h. properties of the product were examined by x-ray diffraction pattern (xrd), scanning electron microscope (sem) and fourier transform ...

The effects of sonication, potassium ferrate (K2FeO4) oxidation and their simultaneous combination (called “sono-oxidative pre-treatment”) on chemical properties and anaerobic digestion of waste activated sludge (WAS) were investigated and compared comprehensively. Based on chemical parameters, the optimum operating conditions were found to be 0.3 g K2FeO4/g total solids (TS) dosage for 2-h ind...

Robert Mettin Christian-Doppler-Laboratory for Cavitation and Micro-Erosion Drittes Physikalisches Institut Universität Göttingen Friedrich-Hund-Platz 1 37077 Göttingen, Germany Andrea Thiemann Christian-Doppler-Laboratory for Cavitation and Micro-Erosion Drittes Physikalisches Institut Universität Göttingen Friedrich-Hund-Platz 1 37077 Göttingen, Germany Carlos Cairós Barreto Christian-Doppler...

the zinc-cadmium oxide (zno-cdo) nanocomposites with different weight percentages of cadmium oxide (cdo) nanoparticles were successfully synthesized by the sonochemical method using zinc and cadmium nitrates as precursors to probe their nano-structured surfaces for the decomposition reactions of chloroethyl phenyl sulfide (ceps) as a surrogate of sulfur mustard agent simulant. scanning electron...

A fibromialgia corresponde a uma condição dolorosa musculoesquelética crônica que se diagnostica por meio da presença de dor crônica e difusa, e pela presença de dor à compressão de pelo menos onze de dezoito pontos anatomicamente determinados. Nos distúrbios do sono, embora não constituam critério diagnóstico, são freqüentes, em especial, os eventos de fragmentação do sono, tais como o aumento...

Internacional de Distúrbios do Sono. Estes são (1) a síndrome de mudança de fuso horário (jet lag), (2) distúrbio do sono, trabalho por turnos, (3) padrão irregular de sono

Silver nanostructures as an effective antibacterial materials were synthesized via three various hydrothermal, sono-chemical and microwave methods using water as a green solvent. Then Chitosan-Ag polymer based nanocomposites were made by a fast chemical procedure. The influence of power, temperature and time on the morphology and particle size of the products was investigated. Scanning electron...

Ethylenediaminetetraacetic acid (EDTA) is a chelating agent that has been used for decontamination purposes in nuclear industry. The presence of EDTA in decontamination wastes can cause complexation of the cations resulting into interferences in their removal by various treatment processes such as chemical precipitation, ion exchange etc. Further, it might also impart elevated leachability of c...

The chemical effects of acoustic cavitation are obtained in sono-reactors built-up from a vessel and an ultrasonic source. In this paper, simulations of an existing sono-reactor are carried out, using a linear acoustics model, accounting for the vibrations of the solid walls. The available frequency range of the generator (19-21 kHz) is systematically scanned. Global quantities are plotted as a...

This work experimentally elucidates the efficiencies of sono-alkalization treatment on municipal sewage sludge. The total solids (TS) concentration of the sewage sludge was pre-adjusted at 29.7 g/L. Two parameters such as sodium hydroxide (NaOH) dosage and sonication time were considered by the central composite design (CCD) program to investigate the effect on the degradation of phthalate acid...