ORGANOPHILIC CLAYS AS PROMISING ADSORBENTS OF NATURAL DYES

Purpose: Environmental problems have been the subject of several studies of various scientists in recent years as a result of drastically increasing in the industrial activity. Thus, numerous contaminants are detected in groundwater and surface water, soil, among these are the dyes, pesticides and organ chlorines that are the focus of this study. We also emphasize the drastic increase in pesticide applications in agricultural activities and improper disposal of waste materials that promote a significant increase of contaminants in soils and natural waters. Therefore, many studies have been focused on developing new techniques for the treatment and / or detection of these contaminants. Various studies have shown that chemically modified kaolinite (acid activation) shows higher adsorption capacity, and also shown that the hybrid material-based clays are efficient for detecting various contaminants. Moreover, the multifunctional nature of these materials has been rarely related in literature data. In order to propose the synthesis of new hybrid materials based on clays with specific properties to obtain adsorbents for natural dyes such as cyanidin and / or chlorophyll the aim of this work is study the effect of grafting of kaolinite with amino groups from alkoxides via sol-gel process and evaluate the influence of these groups front the adsorptive capacity of a natural kaolinite from Sao Simao, interiority of Sao Paulo.