Abstract
Metal nanoparticles of copper, iron, silver, and gold are incorporated into mercaptopropyl-modified silica by surface chemical modification methods. A silica surface modified with mercaptopropyl functional groups (MP-S) was treated with a concentrated solution of metal salts to form metal complex mercaptopropyl silica composites (Cu2+-MP-S, Fe3+-MP-S, Ag1+-MP-S, Au3+-MP-S). The metal nanoparticle silica nanocomposites (Cu-MP-S, Fe-MP-S, Ag-MP-S, and Au-MPS) were obtained by chemical reduction of the immobilized metal ions using sodium borohydride. The nanocomposite physicochemical properties were investigated by CHN elemental analysis, FTIR, TGA, EDAX, and transmission electron microscopy. Cu, Fe, Ag, and Au nanoparticles showed uniform dispersion with diameters ranging from 3nm to 200nm. The CO2 adsorption capacities for metal ions and nanoparticle nanocomposites have considerably increased by 20% and 100%, respectively. Cu-MP-S shows the maximum capacity of 0.52mmol/g as measured by TGA analysis. The preparation procedure is favorable for the synthesis of a variety of metal–silica composites for their potential application in catalysis and greenhouse gas sequestration.
•Newly developed of metal-organic-silica (MOS) nanocomposites of copper, iron, silver and gold incorporated into mercaptopropyl-silica by surface chemical modification method.•The method shows that, metal nanoparticles are capable for CO2 sequestration and Cu has a highest capacity.•This work will open a wide range of new work by incorporating metals nanoparticles in different materials such as mesoporous and microporous material for CO2 sequestration.•The MOS shows better capacity than modified silica with mercapto and amino silica alone.
Metal-organic-silica (MOS) nanocomposites of metal nanoparticles of copper, iron, silver, and gold are incorporated into mercaptopropyl-modified silica by surface chemical modification methods. A silica surface modified with mercaptopropyl functional groups (MP-S) was treated with a concentrated solution of metal salts to form metal complex-mercaptopropyl-silica composites (Cu2+-MP-S, Fe3+-MP-S, Ag1+-MP-S, Au3+-MP-S). The metal nanoparticle silica nanocomposites (Cu-MP-S, Fe-MP-S, Ag-MP-S, and Au-MP-S) were obtained by the chemical reduction of immobilized metal ions using sodium borohydride. The nanocomposites’ physicochemical properties were investigated by CHN elemental analysis, FTIR, TGA, EDAX, and transmission electron microscopy. Cu, Fe, Ag, and Au nanoparticles showed a uniform dispersion through the silica support with diameters ranging from 3nm to 200nm. The CO2 adsorption capacities for metal ions and nanoparticle nanocomposites have considerably increased by 20% and 100%, respectively. Cu-MP-S shows the maximum capacity of 0.52mmol/g as measured by TGA analysis. In addition, the preparation procedure is favorable for the synthesis of a variety of metal-silica composites for their potential application in greenhouse gas sequestration.