Evaluation of pH and thermal stability of sorbent based on silica modified with polyaniline using high-resolution continuum source graphite furnace atomic absorption spectrometry and Raman spectroscopy

The solubility of silica occurred significantly lower for Si-PANI adsorbent comparing to silica and RP-18. Our research shows that covering the particles of silica with polyaniline protects the surface of support material against the drastic pH value. The results obtained by Raman analyses confirm the high stability of polyaniline layer at a temperature range of 30-70 °C and at pH from 1 to 12. The sorbent may be used in separation techniques, e.g. as a stationary phase for liquid chromatography in the wide pH and temperature range.