Synthesis and Characterization of Polyaniline/Zeolite X Composites as Anticorrosion Coating Materials

Application of (polyaniline/zeolite X) composite as anticorrosion coating for energy recovery devices in RO desalination water plants

“…The spectrum of the composite showed a characteristic peak at 339 nm and a broad peak at 623 nm. The first peak corresponds to the π-π* transition and agrees well with the standard band for PANI EB at ~ 330-340 nm [28]. The second peak at 623 nm may be assigned to the exciton transition (which results from the process of charge transfer between the benzenoid ring through the highest occupied energy level and the quinonoid ring through the lowest unoccupied energy level), which is quite weak in these polymers [29].…”

“…This spectrum also showed bands at 1581 cm −1 and 1489 cm −1 , which were attributed to the quinine and benzene rings observed at 1586 cm −1 and 1490 cm −1 in PANI. New absorption peaks at 1047, 538 and 514 cm −1 could be assigned to the presence of zeolite in the prepared composite [28]. Therefore, the FTIR spectra of the P/Z composite exhibit bands characteristic of both PANI and zeolite X, which confirmed the presence of both components in the P/Z composite.…”

“…In the XRD patterns of zeolite X, peaks were recorded at 2θ = 9.85°, 22.4° and 30.0° (Fig. 1b), and therefore, the presence of these peaks within the P/Z composite proved the existence of zeolite X within the final composite [28]. PANI (Fig.…”

“…The second peak at 623 nm may be assigned to the exciton transition (which results from the process of charge transfer between the benzenoid ring through the highest occupied energy level and the quinonoid ring through the lowest unoccupied energy level), which is quite weak in these polymers [29]. The oxidation state of PANI was measured from this exciton band, which has been determined at ~ 637 nm for "standard" EB [28]. The UV-Vis absorption spectra of the P/Z composite revealed a blue shift from the peak location for pure PANI, reflecting a diminished conjugated chain length of PANI in the P/Z composite [28,30].…”

“…The oxidation state of PANI was measured from this exciton band, which has been determined at ~ 637 nm for "standard" EB [28]. The UV-Vis absorption spectra of the P/Z composite revealed a blue shift from the peak location for pure PANI, reflecting a diminished conjugated chain length of PANI in the P/Z composite [28,30].…”