Comparison of Adsorption Kinetics of Rice Straw and Coconut Shell Biomass Carbons to Phenanthrene
Rice straw as precursor matter was pyrolyzed at 700℃ to prepare rice straw biomass carbons with and without ash; internal structure and surface morphology of the two kinds of rice straw biomass carbons were shown by SEM and particle size analysis, and were compared with that of coconut shell biomass carbon; taking phenanthrene as the target contaminant, the adsorption of the three kinds of biomass carbons to phenanthrene was analyzed systemically, and the difference of structure characteristics was discussed. The results showed that rice straw biomass carbon without ash treated by acid efficiently improved the specific surface area, pore volume and carbon content; the adsorption of biomass carbons to phenanthrene was stronger, and the adsorption rate was fast and reached to 70% within 1 min; the adsorption of the three kinds of biomass carbons to phenanthrene followed pseudo-second-order kinetics equation, and rate constant of the equation gradually decreased with the increase of initial mass concentration of phenanthrene, so that the rate was mainly controlled by particle internal diffusion. In general, rice straw biomass carbon treated by acid was an ideal material for the remediation of contaminated soil.
NETL
NSTL
万方数据
维普
