Abstract: The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl₂ chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2·g^-1 of BET surface,0.12 and 0.10 ml·g^-1 of microporous and mesoporous volume,respectively) .The oxygen functional groups such as-OH,C-O and C=O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g^-1 at 12.58μg·m^-3to 87.9μg·g^-1 at 72.50μg·m^-3,and decreased as the adsorption temperature increased,from 246 μg·g^-1 at 25℃ to 61.3μg·g^-1 at 140℃,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g^-1 and 53.8μg·g^-1 respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent.

Key words: carbonaceous adsorbent, dewatered sludge, Hg⁰

摘要： The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl₂ chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2·g^-1 of BET surface,0.12 and 0.10 ml·g^-1 of microporous and mesoporous volume,respectively) .The oxygen functional groups such as-OH,C-O and C=O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g^-1 at 12.58μg·m^-3to 87.9μg·g^-1 at 72.50μg·m^-3,and decreased as the adsorption temperature increased,from 246 μg·g^-1 at 25℃ to 61.3μg·g^-1 at 140℃,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g^-1 and 53.8μg·g^-1 respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent.

关键词: carbonaceous adsorbent, dewatered sludge, Hg⁰