Decolorization of reactive red 2 dye by using pva- polyaniline immobilized system

Abstract

The immobilized of polyaniline (PANi) and polyvinyl alcohol (PVA) in bilayer system were studied base on several operational condition parameters such as loading and pH of the reactive red 2 dye solution. The PVA/PANi immobilized system was prepared by coating the PVA layer followed by deposition of PANi onto the surface of the glass plate. In this system, the addition of PVA particles works as binder between the PANi and the substrates. It was found that, PVA/PANi works as absorbent in this system and shown good response towards to the adsorption process of RR2 dye. This process can be seen by the decolorization ofthe dye. This decolorization was influenced by several factors which related to the interaction of dye with PVA/PANi composite and also during conditioning of dye as well. As a result, the adsorption process of RR2 dye in the immobilized system showed the best removal of dye under aerated system with the solution condition at pH 7. The percentage of dye removal was increased linearly with the amount of loading PVA/PANi. The rate of adsorption of dye was high at the beginning and after 30 minutes and onwards, all loading absorption rate has drop and the reading started to plateau indicates the surface areas of the system were nearly filled up by the dye particles. Thus, the highest adsorption was achieved was at 80 % removal after two hours. Indeed, by prolonging the time did not change the colour of the solution indicated to the maximum adsorption capacity of the process has been achieved.