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Mercury Removal by Magnetic Biochar Derived from Simultaneous Activation and Magnetization of Sawdust
Abstract
Novel magnetic biochars (MBC) were prepared by one-step pyrolysis of FeCl 3 -laden biomass and employed for Hg 0 removal in simulated combustion flue gas. The sample characterization indicated that highly dispersed Fe 3 O 4 particles could be deposited on the MBC surface. Both enhanced surface area and excellent magnetization property were obtained. With the activation of FeCl 3, more oxygen-rich functional groups were formed on the MBC, especially the C═O group. The MBC exhibited far greater Hg 0 removal performance compared to the nonmagnetic biochar (NMBC) under N 2 + 4% O 2 atmosphere in a wide reaction temperature window (120–250 °C). The optimal pyrolysis temperature for the preparation of MBC is 600 °C, and the best FeCl 3 /biomass impregnation mass ratio is 1.5 g/g. At the optimal temperature (120 °C), the Fe 1.5 MBC 600 was superior in both Hg 0 adsorption capacity and adsorption rate to a commercial brominated activated carbon (Br-AC) used for mercury removal in power plants. The mechanism of Hg 0 removal was proposed, and there are two types of active adsorption/oxidation sites for Hg 0: Fe 3 O 4 and oxygen-rich functional groups. The role of Fe 3 O 4 in Hg 0 removal was attributed to the Fe 3+ (t) coordination and lattice oxygen. The C═O group could act as act as electron acceptors, facilitating the electron transfer for Hg 0 oxidation.
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Metadata
- Authors
- Yang, J., Zhao, Y., Ma, S., Zhu, B., Zhang, J., & Zheng, C.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-10-19
- Volume
- 50
- Issue
- 21
- Pages
- 12040-12047
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2530307211
- Cited by
- 396
- References
- 29
- FWCI
- 29.51
- Type
- journal article
- Language
- en
- Open access
- closed
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