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The surface water management system is in a search of high efficient nano phosphate adsorbents to prevent eutrophication and to maintain good water quality standards. The chitosan template method was used to synthesize mesoporous lanthanum oxide (La2O3) nanoparticles. The formation, crystalline character, stability, particle size, morphology, and porosity of La2O3 were explored from X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR), and Thermogravimetric analysis (TG/DTG), Transmission electron microscopy (TEM) and Braunauer-Emmet-Teller (BET) analysis. The phosphate adsorption capacity of synthesized La2O3 was 266.7 mgg−1. The adsorption of phosphate was found to increase with phosphate concentration and reaction time till equilibrium was attained. The maximum adsorption capacity was obtained for 480 ppm initial phosphate solution with 1 h reaction time. The adsorption isotherm data correlated well with the Redlich-Peterson isotherm model and kinetic data with the Pseudo second-order kinetic model. Nano mesoporous La2O3 after phosphate adsorption was characterized and probable mechanisms for the phosphate adsorption were also proposed. This study demonstrates the potential of nano mesoporous La2O3 as an effective adsorbent for removing phosphate from contaminated water. [ABSTRACT FROM AUTHOR]

Nano mesoporous lanthanum oxide (La2O3) was synthesized by the starch template method. The physicochemical characterization of La2O3 was performed by versatile techniques like TGA-DTG/DSC, XRD, FT-IR, TEM and Surface area and porosity measurements. Nano mesoporous La2O3 prove to be a useful catalyst for Friedel Crafts benzylation of o-xylene (o-Xyl) using benzyl chloride (BC). The effect of reaction temperature, catalyst loading and reaction time on benzylation of o-Xyl was investigated at different BC/o-Xyl molar ratio. High BC conversion with good 3,4-dimethyl diphenylmethane (3,4-DMDPM) selectivity was achieved with 0.1 g catalyst at a temperature of 433 K, 2 h of reaction time and 1:1 reactant molar ratio. 3, 4-DMDPM was obtained as the major product regardless of temperature, time and reactant molar ratio. The BC conversion and selectivity were found to increases with reaction time, temperature and catalyst dose and decrease with increase with reactant molar ratio. [ABSTRACT FROM AUTHOR]

In this study nano lanthanum oxide (La2O3) was synthesized by starch template method. The physicochemical characterization of La2O3 was carried out by versatile techniques like TGA-DTG/DSC, XRD and FT-IR. The XRD analysis confirms the pure phase and hexagonal structure of La2O3. Thermal analysis of La2O3 precursors proved to be useful to understand the mechanism of thermal degradation behaviour during the formation of La2O3. The synthesized La2O3 was chemically unstable in ambient air due to its hygroscopic nature and a complete transformation into hexagonal lanthanum hydroxide (La(OH)3) was detected. Investigations of dielectric parameters viz. capacitance, dielectric constant, dielectric loss and ac conductivity measurements of La2O3 and La(OH)3 were done using impedance spectroscopy. La(OH)3 found to have high capacitance, high dielectric constant and high ac conductivity with almost same dissipation factor compared to La2O3. [ABSTRACT FROM AUTHOR]

In this study nano lanthanum oxide (La2O3) was synthesized by starch template method. The physicochemical characterization of La2O3 was carried out by versatile techniques like TGA-DTG/DSC, XRD and FT-IR. The XRD analysis confirms the pure phase and hexagonal structure of La2O3. Thermal analysis of La2O3 precursors proved to be useful to understand the mechanism of thermal degradation behaviour during the formation of La2O3. The synthesized La2O3 was chemically unstable in ambient air due to its hygroscopic nature and a complete transformation into hexagonal lanthanum hydroxide (La(OH)3) was detected. Investigations of dielectric parameters viz. capacitance, dielectric constant, dielectric loss and ac conductivity measurements of La2O3 and La(OH)3 were done using impedance spectroscopy. La(OH)3 found to have high capacitance, high dielectric constant and high ac conductivity with almost same dissipation factor compared to La2O3. [ABSTRACT FROM AUTHOR]