科研之友
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摘要
Biochar from waste product is considered to be an alternative adsorbent for the removal of aqueous heavy metals. In this work, experimental investigations were conducted to study the effect of biochar that was pyrolytically produced from cattle manure waste on the removal of aqueous cadmium (Cd). The results showed that the highest sorption capacity of cattle manure biochar was 18.12 mg/g. The sorption ability of Cd increased with increasing pH, and the sorption of Cd was favorable at a pH value of 8.0. The equilibrium data were well fitted by Freundlich model. The kinetic data were fitted well by the pseudo-second-order model. The fitting results from infra-particle diffusion model showed that the sorption process might be a complex natural process that consisted of both surface sorption and infra-particle diffusion. The thermodynamic studies indicated that the sorption was endothermic, and the randomness of the adsorbed species increased and was spontaneous at high temperatures. The sorption was attributed primarily to the oxygen-containing functional groups of biochar, which was confirmed by batch sorption experiments, mathematical modeling, and characterization of the Cd-laden biochar samples using SEM-EDS, XRD, FTIR and XPS.
- 出版日期2016
- 单位兰州交通大学
