Abstract Surface of a particle is inevitably charged. When the surrounded by fluid potential difference arises between surface and bulk, called zeta (ζ) which controls many interfacial properties involving in suspension, emulsion, colloid etc. Many phenomena happening around us have at least one step that passes through an interface. Thus, application ζ practically uncountable. Discovered late 19 th century, almost past 120 years, has emerged areas to meet fruitful need mankind. However,...

Nanocrystalline TiO2 was synthesized by controlled hydrolysis of titanium tetraisopropoxide. The anatase phase converted to rutile thermal treatment at 1023 K for 11 h. catalysts were characterized X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), Fourier-transform infrared absorption spectrophotometry (FT-IR) and N2 adsorption (BET) 77 K. This study compare the photocatalytic activity phases nanocrystalline degradation acetophenone, nitrobenzene, methylene blue malachite...

Mesoporous nanocrystalline TiO2 was prepared by hydrolysis of titanium isopropoxide, and the band gap modified with transition metal ions Ag, Co, Cu, Fe, Ni having different work functions wet impregnation method. X-ray diffraction (XRD), photoelectron spectrophotometer, diffuse reflectance spectrophotometer (DRS), scanning electron microscope (SEM), BET techniques were used for characterization catalysts. By using DRS technique, highest red shift 11 nm lowest 1.5 observed Fe ion impregnated...

Nanocrystalline zirconia samples having predominantly tetragonal crystalline phase were synthesized using sol−gel and conventional precipitation techniques from zirconium hydroxide obtained by the hydrolysis of both propoxide oxychloride precursors. Thermal drying gel in an oven (110 °C, 12 h) results lower crystallite size (11−13 nm) as compared to under vacuum (50 mbar, 70 °C), which shows higher (20−21 during synthesis. The progressive transformation monoclinic with increasing calcination...

This study investigated the role of band gap, surface area, and phase composition on photocatalytic activity nanocrystalline TiO2. Nanocrystalline TiO2 (8−29 nm) was synthesized by hydrolysis titanium tetraisopropoxide. The crystalline structure, morphology were determined X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), N2 adsorption (BET) at 77 K, respectively. It is observed that gap decreases from 3.29 to 3.01 eV with increasing calcination temperature. crystallite size...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of Porosity and Surface Acidity in Montmorillonite Clay on Acid ActivationPrakash Kumar, Raksh V. Jasra, Thirumaleshwara S. G. BhatCite this: Ind. Eng. Chem. Res. 1995, 34, 4, 1440–1448Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https://pubs.acs.org/doi/10.1021/ie00043a053https://doi.org/10.1021/ie00043a053research-articleACS PublicationsRequest reuse permissionsArticle...

The synthetic hydrotalcites with Mg/Al molar ratios of 2.0−3.5 were synthesized by coprecipitation method at low supersaturation conditions followed hydrothermal treatment under autogenous water vapor pressure 70−140 °C. These samples characterized powder X-ray diffraction (P-XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and surface area measurements. increasing temperature longer aging time increased the...

A series of Mg−Al−CO3 layered double hydroxide (LDH) samples have been synthesized by conventional precipitation and coprecipitation methods. The effect various synthetic parameters, such as cation molar ratio, mode addition magnesium aluminum precursors, temperature, agitation, drying conditions, on the structural, textural, thermal behavior has studied. These properties were correlated with CO2 adsorption capacity samples. LDH sample prepared optimized parameters shown higher (22 cm3/g).

β-Alkylation of alcohols has been efficiently accomplished using readily available 3d metal Cr under microwave conditions in air. Well-defined molecular is involved with a KIE 7.33 and insertion α-alkylated ketone into Cr–H bond as the RDS.

Homogeneous electrocatalytic systems based on readily available, earth-abundant, inexpensive base metals Ni, Co, and Cr have been formulated for the electro-oxidation of alcohols (methanol ethanol) that constitute a key half-cell component direct alcohol fuel cells (DAFCs). Notably, excellent results were obtained both methanol as well ethanol while operating with assembly all-non-noble working counter electrode consisting glassy carbon graphite rod, respectively. Using NaOH supporting...

Abstract The recent status of pressure swing adsorption (PSA) as a process for separating multicomponent gas mixtures is reviewed. applications new generation adsorbents, such zeolites, carbon molecular sieves, and, more recently, pore engineered are described in detail. important theories from well those the PSA briefly. commercial process-present and potential-are discussed at length.

The TiO2-coated zeolite photocatalysts were prepared by dispersing powders in dilute titanium tetraisopropoxide solution. characterization of the catalysts was carried out X-ray diffraction, scanning electron microscopy, and N2 adsorption. presence TiO2 on surface confirmed UV−visible diffuse reflectance spectroscopy. photocatalytic activity NaY HY investigated degradation aqueous solution methylene blue dye. highest obtained with 1% catalysts. This study demonstrated that catalyst is higher...