부산대학교 도서관

The present work investigated the synthesis of new magnesium phosphate polyaniline nanocomposites via an ultrasound-assisted physical mixing process. The prepared nanocomposite was characterized using XRD, FTIR, and SEM–EDX. After that, the material was examined for its ability to adsorb hexavalent chromium Cr(VI) and eriochrome black T (EBT) dye in aqueous solution. Batch tests were carried out for the examination of the influence of several factors, i.e., the solution pH, nanocomposite dosage, pollutant concentration, and contact duration. Besides, to study the impact of factors and their interactions on Cr(VI) and EBT uptake, the central composite design (CCD) was investigated. It was found that the nanocomposite was effective in removing 92% of Cr(VI) and 90% of EBT under the optimum conditions determined based on the desirability function. The pseudo-second order model describes the kinetic data for Cr(VI) and, the Elovich model describes the kinetic data for EBT. The Redlich-Peterson isotherm fitted the equilibrium data of both pollutants. The highest capacities determined by Langmuir were 445 and 172 mg g−1, respectively. The adsorption was endothermic and spontaneous. Finally, the nanocomposite displayed good regeneration ability, with an insignificant decrease in the removal efficiency after many cycles. According to these findings, the developed Mg3(PO4)2/Pani nanocomposites could be used as a reliable and efficient adsorbent in practical applications.