INVESTIGATION OF MODIFIED CEDAR NUT SHELL-BASED SORBENTS

The investigation was carried out to establish influences of thermal, chemical and thermochemical modifications on compositions functional groups the sorbents based nut shells Siberian cedar (Pinus sibirica) their physical properties. Samples natural (CNS) were thermally-modified at T=300 °С analyzed by methods potentiometric titration Fourier-transform infrared spectroscopy. It has been established that CNS possess 1.5–1.7 2.3–4.3 times as many hydroxyl carboxyl in constitution grading 0.1–0.5 0.55–0.75 mm, respectively, CNS. Chemical modification nitric acid solutions with various concentrations (0.5–5n). shown being treated 5n HNO3, samples mm 3.5 CNS, while an increased number only. Thermochemical 2 stages: first, firing a temperature 300 °С, then HNO3 concentrations. revealed this results increasing predominantly carbon sorbents. isotherm sorption copper (II) ions modified describes microporous solids relatively small outer surface, whereas zinc polymolecular adsorption onto both porous macroporous adsorbents. chemically thermochemically are most effective extract ions.