Influência do método de preparo da casca do coco verde como biossorvente para aplicação na remoção de metais em soluções aquosas

Abstract

The main sources of pollution by toxic metals are those coming from industrial effluents, mining and farming. Adsorption using low cost materials, or biosorbents, is emerging as an economically attractive alternative treatment for the removal and potential recovery of toxic metals. In this study, the influence of various treatments using powder of green coconut shells was studied (cold water, hot water, albumin, sodum hydroxide) for removal of the toxic metals Cu2+, Cd2+, Ni2+, Pb2+ and Zn2+. We also analyzed physical and chemical parameters including pH, electrical conductivity, color and COD in “washings” coming from the experiments. It was found that treatments with sodium hydroxide and albumin gave better results in terms of adsorption capacities for all metals studied, although the “washings” presented physicochemical characteristics in disagreement with the relevant legislation in the State of Ceará (SEMACE N.o 154/2002) on disposal of industrial effluents.