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摘要
In this study, a type of novel biomass-derived porous iron/carbon material was prepared by the high-temperature carbothermal reduction method under anaerobic conditions, and its structure and properties were analyzed in detail. The effects of environmental factors during preparation including pyrolysis temperature, pH, and co-existing ions on the performance of cadmium (Cd) removal were investigated, and the corresponding Cd fixation mechanism by this iron/carbon material was revealed. The results show that the specific surface area and pore volume of the material increased with the increase of the pyrolysis temperature, and nanoscale zerovalent iron and iron carbide occurred at 800℃, a magnetic iron/carbon-based functional material (MCFe-800) was prepared, which was beneficial to the magnetic recovery. The adsorption kinetic experiment results show that the removal efficiency of Cd by MCFe-800 was significantly higher than that of other pyrolysis temperatures, and the maximum removal capacity normalized to iron was 463.84 mg·g?1. It is more favorable for Cd removal by MCFe-800 under neutral conditions. The removal mechanisms of Cd were mainly electrostatic adsorption, co-precipitation, and surface complexation. In addition, after four cycles, the removal efficiency of Cd by MCFe-800 in real water was still 75.0%. Filter column experiments show that the treatment capacities of MCFe-800 were 400 BV and 270 BV when the initial concentrations of Cd(II) were 1 000 μg·L?1 and 2 000 μg·L?1, respectively. Therefore, the novel biomass-derived porous iron/carbon material has a great application potential for the remediation of Cd pollution in water. ? 2022 Science Press.
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