Adsorção de Diclofenaco Sódico por Carvão Ativado obtido do Resíduo da Casca da Acácia Negra (Acacia mearnsii De Wild)

Abstract

In the last years the frequency of emerging contaminants found in aquatic matrices has become a big ambiental problem, bacause your effects in the long run are unknown. The emerging polluants are understood as pharmaceuticals, hormones, steroids, pesticides and industrial waste. This includes the sodium diclofenac, an anti-inflamatory drug non steroid used to relieve pain and inflamation. This compound are classified how endocrine disruptor due to its capacity to interfere in the normal performance of this system. The incorrect discard of this pharmaceuticals deserves attention. The tratament stations of water are composed of a series of unitary operations, which aims turn the potable water. In this case, the water pass by physical chemical processes like coagulation, flocculation, decantation anf filtration, in addiction to desinfection processes, which in turn, aim at eliminating of any living organisms presente in the water that can be harmful to humans. Nonetheless, this metodology does not guarantee the effective removal of the pharmaceuticals liable to are presentes in this environment. In view of this, the adsorption process presentes itself as an efficient alternative and easy operation, able to minimize the environment impacts. This unitary operation consist in the separation and purification of Chemical mixtures, where occurs the transferation of phases, in which the adsorbate clings to a solid surface, which get the name of adsorbent. Researches seeks to develop new materials that can replace the comecial adsorbents. The residue generated by the extration of tannin from the bark of the black wattle appears has an alternative, since recent studies have found an adsorption efficiency superior to commercial activated carbon for determined adsorbates, for exemple the nimesulide, and in the rice oil bleaching step. The black wattle (Acacia mearnsii De Wild) is planted commecially in the Rio Grande do Sul, where one of its main applications is in the use of its bark as raw material in the manufacture of tannin, which in turn is widely used in the leather industry. In view of this, the objective of the present work was study the adsorption of sodium diclofenac using the activated carbon producing from the waste generated from the tannin extraction of the black wattle bark. For that, kinectics and adsorption isotherms tests were performed. The material presentes removal efficiency of 94%, consdidered satisfatoty The kinectics studies demonstrated that model that best fitted the experimental data was the pseudo second order. In relation to isotherm fittings, the model that best described the experimets was that of Langmuir, whose 𝑞𝑚á𝑥 obteined was approximately 609 mg g-1.