Removal of Cd2+ from aqueous solution using MgAICO3-layered double hydroxide / Nurul Izza Taib and Norzuyanti Mohd Aris

Anion clay hydrotalcite MgAlCO3 with a Mg/Al molar ratio of 3:1 was synthesized by co-precipitation at room temperature and pressure. The physicochemical properties were evaluated using Powder X-Ray Diffraction (PXRD), Fourier Transform Infrared (FTIR) spectroscopy and Thermogravimetric Analysis (TGA). The efficacy of anion clay hydrotalcite in the removal of Cd2+ from aqueous solutions was investigated with respect to contact time, initial concentration, pH, adsorbent dosage and temperature. The Cd2+ removal increased with the increased in contact time, adsorbent dosage, pH and initial concentration. Adsorption decreases with increasing initial concentration and temperature, for which the latter is indicative of an exothermic process. The equilibrium adsorption capacity of MgAlCO3 was evaluated using linear Langmuir and Freundlich isotherms with respect to the separation factor, RL

Functionalization of mesoporous Si-MCM-41 by grafting with trimethylcholosilane

954The production of functionalized mesoporous silicas has attracted great attention in the last years. In particular, the uses of organosilanes, as modification agents, has been largely studied due mainly to the increasing requirements deriving from the area of polymer nanocomposites, treatments of heavy metal contaminants, heterogeneous catalysis and also in components of active corrosion protection coatings. In this study, organosilane-modified mesoporous were prepared and investigated by various physico-chemical techniques, including X-ray powder diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), 13C CP/MAS NMR and Thermalgravimetry (TGA). The organically modified mesoporous derived from the reaction of mesoporous Si-MCM-41 with trimethylchlorosilane have been considered. The results indicated that the surface modification did not modify the original structure of Si-MCM-41 but altered their original hydrophilic nature to hydrophobic. Herein, we demonstrate the possibility of modify and functionalize surface of MCM-41, enabling applications in many fields as nanocomposites, drug releasing agents and components of active coatings