The W, V, Ce, Zr, Fe, and Cu metal ion substituted nanocrystalline anatase TiO2 was prepared by solution combustion method characterized XRD, Raman, BET, EPR, XPS, IR TGA, UV absorption, photoluminescence measurements. structural studies indicate that the solid formation limited to a narrow range of concentrations dopant ions. photocatalytic degradation 4-nitrophenol under solar exposure investigated with Ti1-xMxO2±δ. rates these catalysts were lesser than undoped both radiation. However,...

Nanocrystalline TiO2 was synthesized by the solution combustion method using titanyl nitrate and various fuels such as glycine, hexamethylenetetramine, oxalyldihydrazide. These catalysts are active under visible light, have optical absorption wavelengths below 600 nm, show superior photocatalytic activity for degradation of methylene blue phenol UV solar conditions compared to commercial TiO2, Degussa P-25. The higher is attributed structure catalyst. Various studies X-ray diffraction, Raman...

Because of growing environmental concerns and increasingly stringent regulations governing auto emissions, new more efficient exhaust catalysts are needed to reduce the amount pollutants released from internal combustion engines. To accomplish this goal, major in exhaust—CO, NOx, unburned hydrocarbons—need be fully converted CO2, N2, H2O. Most contain nanocrystalline noble metals (Pt, Pd, Rh) dispersed on oxide supports such as Al2O3 or SiO2 promoted by CeO2. However, conventional catalysts,...

We demonstrate an ultrafast method for the formation of graphene supported Pt catalysts by co-reduction oxide and salt using ethylene glycol under microwave irradiation conditions. Detailed analysis mechanism hybrids indicates a synergistic whereby presence ions leads to faster reduction GO defect sites on reduced serves as anchor points heterogeneous nucleation Pt. The resulting hybrid consists ultrafine nanoparticles uniformly distributed susbtrate. have shown that exhibits good catalytic...

The effects of various processing conditions, like annealing, poling, mechanical rolling and their combinations, on the dielectric ferroelectric properties PVDF [poly(vinylidene fluoride)] were systematically studied in this work. Further, effect sequence structure was investigated. While all conditions adopted here resulted phase transformation α- to electroactive β-polymorph PVDF, fraction β-phase developed observed be strongly contingent process. α determined by X-ray diffraction FTIR....

The photocatalytic degradation of various organics such as phenol, p-nitrophenol, and salicylic acid was carried out with combustion-synthesized nano-TiO2 under UV solar exposure. Under identical conditions exposure, the initial rate phenol TiO2 is 2 times higher than commercial Degussa P-25 TiO2. intermediates catechol (CC) hydroquinone (HQ) were not detected during TiO2, while both when degraded over P-25. This indicates that rates secondary photolysis CC HQ occur extremely faster at which...

Three novel metal-organic frameworks (MOFs) [Co2(C10H8N2)][C12H8O(COO)2]2, 1, [Ni2(C10H8N2)2][C12H8O(COO)2]2·H2O, 2, and [Zn2(C10H8N2)][C12H8O(COO)2]2, 3, with three-dimensional structures have been synthesized characterized. The of the three compounds appear somewhat related, formed by connectivity involving metal polyhedra (Co4N trigonal bipyramids in NiO4N2 octahedra ZnO4 tetrahedra ZnO3N2 3), 4,4'-oxybis(benzoate), 4,4'-bipyridine. photocatalytic studies on 1−3 indicate that they are...

A method for the removal of anionic (sulfonated) dyes from aqueous dye solutions using chemical interaction molecules with polyaniline is reported. Polyaniline (PANI) emeraldine salt was synthesized by oxidation. Sulfonated undergo interactions charged backbone PANI, leading to significant adsorption dyes. This phenomenon selective PANI reported first time and promises a green sulfonated organics wastewater. The experimental observations UV-vis spectroscopy, X-ray diffraction, conductivity...

The photocatalytic degradation of various Rhodamine dyes with different functional groups, namely, B (C28H31ClN2O3), 6G Blue (C28H32N2O3), and perchlorate (C28H31ClN2O7) was investigated under UV irradiation. kinetics determined in the presence two catalysts: commercial Degussa P-25 TiO2 synthesized by combustion solution method. effect organic solvents (ethanol acetonitrile) metal ions (Cu2+, Fe3+, Zn2+, Al3+) on photodegradation investigated. significantly reduced rate. A detailed...

The catalysts, Ti0.9M0.1O2-δ (M = Cr, Mn, Fe, Co, Cu), were synthesized in anatase phase by solution combustion. Selective catalytic reduction (SCR) of NO with NH3 was investigated over these catalysts. reaction occurred at the lowest temperature Ti0.9Mn0.1O2-δ, but selectivity for N2 highest Ti0.9Fe0.1O2-δ. Therefore, both Mn and Fe substituted TiO2 (Ti0.9Mn0.05Fe0.05O2-δ). low a high this catalyst. In order to understand mechanism nature active sites, programmed desorption (TPD) hydrogen...

Biodiesel synthesis (transesterification of triglycerides higher fatty acid to methyl and ethyl esters) from castor oil linseed using methanol ethanol was investigated at subcritical supercritical conditions 200 350 °C bar. The effect molar ratio alcohol oil, temperature, time in ethanol. kinetics the reaction first order, activation energies were determined temperature dependence rate coefficients. also synthesized enzymatically with Novozym 435 carbon dioxide (ScCO2). various parameters...

In this study, we report an approach for the adsorption and desorption of anionic (sulfonated) dyes from aqueous solution by doped polyaniline. have synthesized PANI with two dopants, namely, p-toluenesulfonic acid (PTSA) camphorsulfonic (CSA), used these to adsorb various dyes. It was found that selectively adsorbs does not cationic The causes variation in electrical conductivity PANI, indicating its potential as a conductometric sensor at very low concentration. adsorbed were desorbed...

Ce1−xSnxO2 (x = 0.1−0.5) solid solution and its Pd substituted analogue have been prepared by a single step combustion method using tin oxalate precursor. The compounds were characterized X-ray diffraction (XRD), photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), H2/temperature programmed redution (TPR) studies. cubic fluorite structure remained intact up to 50% of Sn substitution in CeO2, the stable 700 °C. Oxygen storage capacity was found be much higher than that...

Hydrothermal-assisted CuS hierarchical architectures were grown in the presence of anionic sulfur sources, and investigation their degradation efficiency for a pesticide 4-chlorophenol (4-CP) under visible light irradiation was carried out. The dissociation S2- from compound governs nucleation followed by specific pattern growth to produce different morphologies. self-assembled covellite spherical flower architecture assembles thiourea exhibits highest photodegradation activity. open ∼2.3 μm...

Semiconductor based nanoscale heterostructures are promising candidates for photocatalytic and photovoltaic applications with the sensitization of a wide bandgap semiconductor narrow material being most viable strategy to maximize utilization solar spectrum. Here, we present simple wet chemical route obtain ZnO/CdS without using any molecular linker. Our method involves nucleation Cd-precursor on ZnO nanorods subsequent sulfidation step leading formation heterostructures. Excellent control...

The current research work focuses on the combination of photocatalytic and sonocatalytic (sonophotocatalytic) degradation anionic dyes, viz., Orange G, Remazol Brilliant Blue R, Alizarin Red S, Methyl Blue, Indigo Carmine, with solution combustion synthesized TiO2 (CS TiO2) commercial Degussa P-25 (DP-25). rate sonophotocatalytic all dyes reduction total organic carbon was higher compared to individual photo- processes. effect dissolved gases ultrasonic intensity evaluated. A dual-pathway...

A layer-by-layer (LbL) approach has been employed for the fabrication of multilayer thin films and microcapsules having nanofibrous morphology using nanocrystalline cellulose (NCC) as one components assembly. The applicability these nanoassemblies drug delivery carriers explored by loading an anticancer drug, doxorubicin hydrochloride, a water-insoluble curcumin. Doxorubicin good water solubility, is postloaded in In case curcumin, which very hydrophobic limited solubility water, stable...