Obtención de geles de taninos condensados de semillas de uvas (vitis vinifera) para remoción de cromo hexavalente en fase acuosa

Abstract

Hexavalent chromium Cr+6 has been considered a highly toxic heavy metal, and which is generated by industrial and daily activities, causing health problems in humans and environment pollution. Therefore, the objective in this study was to obtain solid bioadsorbent gels (xerogels) based on condensed tannins from grape seeds (Vitis vinifera) for removal of hexavalent chromium (Cr+6). To obtain the solid gels based condensed tannins based grape seeds (GFT) was applied the Design Expert 11 software, starting with a full factorial design 23, for then optimize by applying the Response Surface Methodology (RSM)-Central Composite Design (CCD) varying the factors of formaldehyde /tannin concentration (mmol F/ g T), tannin percentage (%) and pH with levels of 0.5-10, 5-40 y 5-10 respectively. For this process the temperature used was 85ºC and 100% ventilation in the heater.