CO – Page 3 – TechConnect Briefs

Optimizing the removal of Heavy Metals of an artificial wastewater by electrocoagulation using response surface methodology

Suárez A., Agudelo N., Universidad Libre, CO

The Response Surface Methodology (RSM) was employed to investigate the effects of pH and current density on the removal of cadmium, copper and zinc in a artificial wastewater with a large COD by electrocoagulation technique. [...]

Synthesis of porous silicas with high surface area using renewable templates

Peña J.D., Rios L.A., Applied Physicochemical Processes Research Group, CO

Silicas are important supports in heterogeneous catalysis because they have very high specific surface areas, large pore volumes and offer the possibility of incorporating a variety of chemical moieties or heteroatoms within their structure or [...]

Influence of Silica Precursor in the Cobalt Incorporation in Mesoporous Silica MCM-41 Used for the Synthesis of Single Walled Carbon Nanotubes

Ramírez F.C., López B.L., Giraldo L.F., Universidad de Antioquia, CO

In this work several silica precursors have been used for the MCM-41 mesoporous silica synthesis, i.e. Cab-O-sil, sodium silicate and TEOS with incorporation of cobalt in-situ during the synthesis of the molecular sieves. The materials [...]

Synthesis of Single Walled Carbon Nanotubes Using Cobalt Grafted in MCM-41 as Catalyst

Giraldo L.F., López B.L., Haller G.L., Universidad de Antioquia, CO

In this work (SWCNTs) have been synthesized by high pressure CO decomposition using cobalt grafted in MCM41 by means of grafting method employing cobalt (II) acetylacetonate. The reduction temperature of the metal species of this [...]

Intracellular Inclusions and Nanocrystals of magnetotactic coccus isolated from estuary in Colombia

Grisales S., Morillo V., Marquez M., Morales A., Salazar A., Universidad Nacional de Colombia Sede Medellín, CO

Magnetotactic bacteria containing intracellular membrane-bound nanocrystals of magnetite or greigite (Bazylinski, et al. 2004; Flies, et al. 2005). The bacteria may also have intracellular inclusions (Keim, et al. 2005). Magnetosome formation in magnetotactic bacteria provides [...]

Characterization of Intracellular Biogenic Crystals Synthesized by Freshwater Magnetotactic Bacteria (MTBs)

Morillo V., Morales A., Universidad Nacional de Colombia Sede Medellín, CO

Intracellular biogenic crystals synthesized by freshwater magnetotactic bacteria (MTBs) from Colombia were characterized. MTBs were separated from water/sediment samples using a magnetic field of 6 Gauss. Bacteria were observed by transmission electronic microscopy (TEM). Bacterial [...]

Thermal Stability of Carbon Nanotubes produced by CCVD of Ethylene by using Different Supports

Giraldo L.F., López B.L., Barrera G.M., Universidad de Antioquia, CO

In the synthesis of carbon nanotubes two of the most important parameters to consider are the type of support and the kind of catalytic metal. In this work we have studied the thermal stability of [...]