Abstract
The development of non-ferrous metal resources has caused serious cadmium pollution problem in Southwest China. Meanwhile, these areas are rich in bioresources like banana straw. With the assistance of microwave radiation, biomass may accomplish thermal breakdown and carbonization processes efficiently and quickly. In this work, banana straw was used as bioresource to synthesize biochar by microwave pyrolysis for the removal of Cd2+ from aqueous solution. The experiment result showed that the maximum Cd2+ adsorption capacity was 244.43 mg/g. The Elovich kinetic model and the Langmuir isotherm could well fit the adsorption process of Cd2+. Furthermore, the adsorption of Cd2+ by banana straw biochar is achieved through the synergistic effects of mineral precipitation, complexation with oxygen-containing functional groups (OFGs), ion exchange and Cd-π interaction, which accounted for the contribution of 86.57 %, 0.15 %, 3.73 % and 9.55 %, respectively. This study provides an innovative solution of cadmium pollution problem relying on local rich banana straw bioresource.
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