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Facile synthesis of phosphorus-doped porous biochars for efficient removal of elemental mercury from coal combustion flue gas

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Li,  Zehua
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Zhou, M., Xu, Y., Luo, G., Zhang, Q., Du, L., Cui, X., et al. (2022). Facile synthesis of phosphorus-doped porous biochars for efficient removal of elemental mercury from coal combustion flue gas. Chemical Engineering Journal, 432: 134440. doi:10.1016/j.cej.2021.134440.


Cite as: https://hdl.handle.net/21.11116/0000-0009-D0D9-7
Abstract
Heteroatom doping is an effective method to modify carbonaceous sorbents and improve their chemical reactivity. In this study, P-doped biochars (PBCs) derived from one-step pyrolysis of H3PO4-laden biomass were developed for elemental mercury (Hg0) removal from coal-fired flue gas. Sample characterization showed that there were massive micropores and slit-shaped mesoporous in the PBCs. The specific surface area and pore volume of PBCs was obviously enhanced after P doping. In addition, more organic functional groups were generated on the PBCs surface, particularly the C-P=O and C=O groups. The PBCs presented far higher mercury removal efficiency compared with raw biochars (BCs). The influences of pyrolysis temperature (700 °C-1000 °C), adsorption temperature (25 °C-180 °C), and various flue gas components (NO, SO2, O2, HCl, and H2O) on mercury removal performance were also analyzed. At the optimum temperature (100 °C), the Hg0 adsorption capacity of PBC900 was increased by more than 400 times compared with BC900, which was also higher than that of a commercial brominated activated carbon. The mechanism responsible for Hg0 removal was further revealed. The results suggested that chemisorption dominated the Hg0 removal process, where the C-P=O, C=O, and O-C=O groups could serve as electron acceptors, accelerating the electron migration process for Hg0 oxidization.