400 ºC occurs directly without the need to isolate the hydroxide or oxyhydroxide aluminum precursors. Both POHA and transition aluminas were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), N2 sorption and Scanning Electron Microscopy (SEM). These findings show an alternative route to produce high standard aluminas.1f:T542,A novel hybrid mesoporous aluminosilicate sieve (HMAS) was prepared with fly ash and impregnated with zeolite A precursors. This improved the mercury adsorption of HMAS compared to original MCM-41. The HMAS was characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption, Fourier transform infrared (FTIR) analysis, transmission electron microscopy (TEM) images and ²⁹Si and ²⁷Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectra. These showed that the HMAS structure was still retained after impregnated with zeolite A. But the surface area and pore diameter of HMAS decreased due to pore blockage. Adsorption of mercury from aqueous solution was studied on untreated MCM-41and HMAS. The mercury adsorption rate of HMAS was higher than that of origin MCM-41. The adsorption of mercury was investigated on HMAS regarding the pH of mercury solution, initial mercury concentration, and the reaction temperature. The experimental data fit well to Langmuir and Freundlich isotherm models. The Dublin-Radushkevich isotherm and the characterization show that the mercury adsorption on HMAS involved the ion-exchange mechanisms. In addition, the thermodynamic parameters suggest that the adsorption process was endothermic in nature. The adsorption of mercury on HMAS followed the first order kinetics.20:T4ab,The potential benefits of decorated graphene are of great interest as they may lead to technological advancements in fabricating electro-chemical devices for catalysis, sensing and energy storage. In this study, we have developed a self-assembly approach to anchor CeO₂ nanoparticles on reduced graphene oxide (RGO) through a facile, efficient sonochemical method. We characterized the CeO₂-RGO nanocomposites using X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, Raman spectroscopy and field-emission scanning electron microscopy (FE-SEM). The results reveal that CeO₂ nanoparticles with a uniform size distribution are anchored on RGO. Furthermore, we investigated the electrochemical properties of CeO₂-RGO nanocomposites for different probes by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. We found that a suitable loading content of CeO₂ on RGO can induce a synergistic effect for optimizing the electro-catalytic activity of the nanocomposites. Our findings will have a profound effect on the use of CeO₂-RGO nanocomposites in electrochemical devices.

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