ESTUDO DA APLICABILIDADE DO CARVÃO ATIVO QUIMICAMENTE TRATADO NA REMOÇÃO DE COR EM EFLUENTE DE TINTURARIAS

Abstract

The adsorption of dyes in carbonaceous adsorbents has been theme of lots of researches on new materials for wastewater treatment. In this work, the adsorption of Reactive Orange 16 Dye was investigated using Carbon, activated by phosphoric acid 85%, as adsorbent. The study indicates that the dye’s adsorption has physical and endothermic nature, showing low activation energy value (34 kJ mol-1). The kinetic parameters show that an elevation in the temperature of the system provokes increase of the initial adsorption rate associated a pseudo-second rate constant. The values of enthalpy of activation, Gibbs energy and entropy of activation indicate that the final activation process occurs with energy absorption and decrease in randomness of the solid/solution system, however, there was not significant change in the carbon's internal structure.

Index Terms - adsorption, activated coal, dye.