MIRCEA SEGARCEANU, DANIELA ELENA PASCU, GINA ALINA TRAISTARU, MIHAELA PASCU (NEAGU), SOFIA TEODORESCU, CRISTINA ORBECI OPTIMIZATION OF MEMBRANE PROCESSES WITH POLYSULFONE/POLYANILINE COMPOSITE MEMBRANES
In this paper we studied the optimization of the process parameters of membranes. We studied four ions: nitrate, sulfate, chloride and phosphate. The results of the experimental study were processed using the following mathematical models: Langmuir, Freundlich and Temkin – Pyzhev. The four ions were microfiltered through a composite membrane with pores of different sizes (0.1mm and 0.5 mm). The four ions analyzed were: nitrates, sulfates, phosphates and chlorides. To determine these, ions were used together with spectrophotometric and titrimetric methods. Experiments were conducted at three different temperatures: 288K, 308K, 328k. The sorption parameters and the fitting of the models were determined by nonlinear regression and then discussed. Wastewaters containing these ions were filtered through polysulfone/ polyaniline (PSf/PANI) membrane composites. The morphological characterization of the membrane was performed using scanning electron microscopy (SEM) and the structural characterization was performed using infrared spectroscopy (FT-IR). The best results were obtained using the Langmuir model for nitrate ions and Temkin– Pyzhev for chloride ions. The following parameters for each ion in part were: initial ion concentration, solution pH, working adsorption capacity, size and thickness of the composite membrane and temperature. The best results for the adsorption capacity were obtained with 0.1mm composite membranes for nitrate and sulfate ions.