No abstract

In this study, an adsorptive ceramic membrane was prepared by a simple dry pressing of a mixture of nanosilica produced from low cost rice husk by hydrothermal technique at sub-critical water conditions, calcium phosphate, and ammonium acetate together and then calcined at 600°C in air. Optimization of the raw materials ratio was found to be necessary to avoid crack formation during sintering process. The membrane microstructure, dye removal efficiency and the permeation flux of the membranes were investigated. The membrane was tested to remove the methylene blue from aqueous solution. Results show that the removal of the dye increases as the silica content increases in the all given membranes and it decreases with an increase in the ammonium acetate. Moreover, the water flux decreases with an increase in the silica content. The methylene blue adsorbed onto the silica membrane can be removed by calcination and the membrane could be recycled several times without any obvious loss in the adsorption performance. In conclusion, this study demonstrates a convenient strategy to prepare an effective adsorptive membrane, which can be applied as a highly recyclable membrane for the adsorption of organic maters. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

No abstract

At this work we synthesized electrospun titanium oxide (TiO2) and nitrogen-doped titanium oxide (N-doped TiO2)for producing hydrogen (H2) in the same time pollutant removal from wastewater by photocatalytic oxidation at room contitions.Weuse titanium isopropoxide (TiP)/polyvinylpyrrolidone (PVP) solution to prepare dispersed titanium oxide in polymer nanofibers by sol-gel processing and electrospinning techniques. TiO2 is a very effective and brillantphotocatalyst for water treatment, but it has drawbacks like absorbing UV light and fast backward reaction and recombination between electrons and generated holes pairs, there are much effort has been devoted to overcome its problems, like doping with metals and nonmetals.Advantage of N-doped TiO2nano fiber is expanded the utilization of a large part of the solar spectrum. This might be useful for environmental and energy applications, such as the photocatalytic degradation of organic pollutants, solar cells, sensors, and water splitting reactions.Thephotocatalytic activity of TiO2 and N-doped TiO2nanofibers was carried out in the waste and dye water-splitting reaction to produce H2and water treatment usingmercury light irradiation. The doping of TiO2 with Nitrogen, which should improve the electronic properties, leading to activation as a photocatalyst under visible light irradiation.several characterization techniques are employed for studying the surface morphology, phase of structure, and binding energy for TiO2 and N-TiO2nanofibers(Scanning electron microscopy, X-ray diffractometry, transmission electron microscope).

No abstract