Abstract
Appropriate disposal of hyperaccumulator biomass is a problem inhibiting the widespread use of phytoremediation technology. In the present study, kinetic analysis of the pyrolysis process of Sedum plumbizincicola, the behaviour of heavy metals and bio-oil composition were studied. The kinetic analysis of the pyrolysis process shows that activation energy (E) changed from 150 to 186 kJ mol−1 and the frequency factor (A) changed from 1.34 × 1011 to 8.99 × 1015 s−1. At temperatures of 450–750 °C more than 66.3 % of zinc (Zn) remained in the char. More than 87.6 % of the cadmium (Cd) was found in the bio-oil. Pyrolysis at 650 °C led to the highest yield of alkanes with low-oxygen compounds found in the bio-oil. Pyrolysis at 650 °C can likely offer a valuable processing method for S. plumbizincicola and recovery of Zn from the char and recovery of Cd from the bio-oil will be attempted in future research.
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We thank the National Natural Science Foundation of China (41325003, 51276040 and U1361115) and the National High Technology Research and Development (863) Program of China (2012AA101402-2) for financial support.
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Zhong, D., Zhong, Z., Wu, L. et al. Pyrolysis of Sedum plumbizincicola, a zinc and cadmium hyperaccumulator: pyrolysis kinetics, heavy metal behaviour and bio-oil production. Clean Techn Environ Policy 18, 2315–2323 (2016). https://doi.org/10.1007/s10098-016-1150-y
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DOI: https://doi.org/10.1007/s10098-016-1150-y