Performance Evaluation of Hydrogen Permeability of Pore-filling Membrane Prepared from Nanoparticles

ナノダイナミクス国際シンポジウム 平成22年1月21日(木) 於長崎大学Nagasaki Symposium on Nano-Dynamics 2010 (NSND2010), January 21, 2010, Nagasaki University, Nagasaki, Japan, Invited Lectur

Preparation of Au-Pd Core-shell Nanoparticles Supported TiO2 and Influence of Photocatalytic Activity on the Shell Thickness

ナノダイナミクス国際シンポジウム 平成22年1月21日(木) 於長崎大学Nagasaki Symposium on Nano-Dynamics 2010 (NSND2010), January 21, 2010, Nagasaki University, Nagasaki, Japan, Invited Lectur

Adsorption/combustion-type gas sensors employing mesoporous γ-alumina loaded with core(Au)/shell(Pd) nanoparticles synthesized by sonochemical reduction

Adsorption/combustion-type gas sensors employing mesoporous γ-alumina (mp-Al2O3) powders loaded with core(Au)/shell(Pd) nanoparticles, which were synthesized by sonochemical reduction, (n(Au/Pd)/mp-Al2O3, n: the amount of Au/Pd nanoparticles loaded, (0.1-1.0 wt%), Au:Pd = 1:4 in weight) have been fabricated and their sensing properties to ethanol, toluene and n-hexane have been investigated in air. The n(Au/Pd)/mp-Al2O3 sensors showed larger responses to these target gases at lower temperatures than those of sensors fabricated with mp-Al2O3 powders loaded with Au and Pd by general impregnation technique (n(Au-Pd)/mp-Al2O3 sensors, Au:Pd = 1:4 in weight), especially when the amount of Au and Pd loaded onto the mp-Al2O3 powders was reduced (?0.5 wt%). These sensing properties seem to be largely dependent on the morphological and compositional characteristics of Au and Pd loaded on the γ-alumina surface. In addition, the n(Au/Pd)/mp-Al2O3 sensors showed much larger response to ethanol than those to toluene and n-hexane, probably because of the difference in the magnitude of polarity (dipole moment and dielectric constant) of their molecules. However, the sensors obviously detected even 10 ppm n-hexane with the extremely low dipole moment and dielectric constant. These results promise that the n(Au/Pd)/mp-Al2O3 sensors can detect the lower concentration of these gases as well as other VOCs

Applications and Data Analysis using Bayesian and Conventional Statistics in Biochar Adsorption Studies for Environmental Protection

The use of low-cost agricultural waste-derived biochar in solving water and environmental challenges induced by climate change was investigated and sound conclusions were presented. Water reuse strategies can diminish the impact of climate change in rural and remote areas of developing countries. The novel biochar materials from three agro-waste biomass (Matamba fruit shell, Mushuma, and Mupane tree barks) were investigated and characterized to attest to their capacity to remove iodine from the aqueous solution. Their surface morphologies were assessed using Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy (FESEM-EDX) which exhibited their structural phenomena to purge environmental pollutants. The Fourier-transform infrared spectroscopy (FTIR) was conducted to show surface functional groups of the biochar materials and Matamba fruit shell exhibited hydroxyl (-OH), carbonyl groups (C=O), C=C stretches of aromatic rings, and the carboxylate (C–O–O–) groups on its surface with corresponding data from the Isotherm and Kinetic models, statistically analyzed by the conventional and Bayesian methods. These surface mechanisms are said to be induced by weak van der Waals forces and - and -stacking interaction on the biochar surface. These adsorbents promised to be potential materials for environmental-ecosystem-protection and water re-use approach

Membrane fouling, chemical cleaning and separation performance assessment of a chlorine-resistant nanofiltration membrane for water recycling applications

The effectiveness of hypochlorite cleaning for fouling mitigation of a prototype chlorine-resistant nanofiltration (NF) membrane was assessed for direct filtration of a secondary treated effluent. The chlorine resistance and separation performance of the prototype NF membrane were also compared to commercial NF and reverse osmosis membranes. The prototype chlorine resistant NF membrane did not show any changes in permeability and conductivity rejection after exposing a NaOCl solution for up to 5 × 104 ppm-h. By contrast, a considerable deterioration in rejection was observed for the other two commercial membranes. Direct filtration of a secondary treated effluent by the prototype NF membrane resulted in a progressive permeability reduction by up to 25% after 10 h of filtration. The membrane permeability was fully restored by hypochlorite cleaning with a 2000 ppm NaOCl solution for 1 h. Effective permeability recovery by hypochlorite cleaning was demonstrated with multiple hypochlorite cleaning cycles. Membrane fouling and hypochlorite cleaning were also simulated using solutions containing a model foulant (sodium alginate, humic acids or bovine serum albumin). Among them, an insufficient permeability recovery was observed for membrane fouling caused by humic acids. Further research is recommended to develop an improved hypochlorite cleaning protocol to control various membrane fouling

Congenital Web-like Tracheal Stenosis Cured Surgically in Adult

A 60-year-old, Japanese woman, with congenital web-like tracheal stenosis surgically treated. Successful relief from tracheal stenosis was obstained. Detection in adulthood and chance of the treatment for congenital tracheal stenosis is very rare. As far as this case is concerned, delay in detection and treatment is discussed of congenital tracheal stenosis

Preparation of Hydrogen Permeable Membrane Using Nanoparticles Electrophoresis Technique

Hydrogen perm-selective membranes composed of Pd nanoparticles were investigated. The nanoparticles were prepared by ultrasonic reduction from PdII ions, and then deposited on a substrate disc with electrophoresis technique. These electrophoretic membranes have shown high performance of perm-selectivity for H2 with separation factor α = 3.85, under room temperature

Preparation of Pore Filling Membrane with Pd Nanoparticles

Hydrogen perm-selective membranes were composed Pd nanoparticles. The nanoparticles were prepared by sonochemical reduction from PdII ions. Then the nanoparticles deposited on a substrate disc with electrophoresis technique. These electrophoretic membranes have shown high performance of perm-selectivity for H2 with separation factor α=3.85, under room temperature.ナノダイナミクス国際シンポジウム 平成20年1月43日(木) 於長崎大学Nagasaki Symposium on Nano-Dynamics 2009 (NSND2009), January 27, 2019, Nagasaki University, Nagasaki, Japan, Poster Presentatio