Uptake of lead by carbonaceous adsorbents developed from tire rubber

摘要: The adsorption of lead in aqueous solution by discarded tire rubber (TR) and carbonaceous adsorbents (CAs) prepared from it thermal chemical treatments is studied. TR was heated at 400 or 900 °C for 2 h N2 atmosphere treated chemically with H2SO4, HNO3, H2SO4/HNO3, HCl, NaOH, HCl-NaOH NaOH-HCl 24 h. CAs were characterized physico-chemically regard to their texture, elemental composition surface chemistry. studied, mainly the kinetic standpoint, using 4×10−3 mol L−1 Pb2+ solutions initial pH 2.0, 5.7 12.6. practically a non-porous material. heat treatment develops meso- macroporosity. effect on macroporosity stronger when HNO3 H2SO4/HNO3 are used. For all adsorbents, not measurable adsorptive With an increase 12.6, kinetics becomes faster amount adsorbed significantly increases. 12.6 time 8 h, percentage 36 wt% TR. TR, higher than 50 wt%. longer times, much slower product HNO3. However, corresponding as high 93 264 CAs, particular °C, good be used rapid removal significant solution.