Method of manufacture of spheres of activated alumina adsorbents via Sol gel process suitable for the adsorption and capture of heavy metals present at low concentrations in a large volume of industrial wastewater

摘要

Manufacturing method of absorbent spheres of activated alumina via Sol gel process suitable for the adsorption and capture of heavy metals present at low concentrations in a large volume of industrial wastewater.The present invention relates to a method for the manufacture of spheres of activated alumina adsorbent, which is based on the known process of sol gel to immobilize microparticles ( 243 38 109 m) of activated alumina, preferably phase sym - A1 ~ 2 ~ ~ 3 ~ in the spherical format. Paste it S with molecules of polyvinyl alcohol (PVA) and nanoparticles of bohemita ( 244 - A1 ~ 2 ~ ~ 3 ~.H ~ 2 ~), these nanoparticles obtained with the aid of a reaction processing sol gel at ambient temperature, in gaseous environment containing NH ~ 3 ~ and in an aqueous medium containing NH ~ 4 ~ oh.The spheres of activated alumina are obtained with high sphericity, mechanical strength greater than 2 kg / sphere, narrow diameter distribution, average diameter between 1 mm and 5 mm, with good chemical stability in means acidic, basic and neutral and with good ability to absorb water. Without a swelling destructive.These spheres are appropriate for the alternative treatment of large volumes of industrial liquid waste containing low concentrations of heavy metals, especially for CD, Cu and Zn, since they can be produced industrially at low cost and with an efficiency of removal of the ord In 27%, 18%, 45% and 25% for CD + Cu + Zn, CD, Cu and Zn, respectively.