Removal of Elemental Mercury from Flue Gas Using Cobalt-Containing Biomaterial Carbon Prepared from Contaminated Iris sibirica Biomass.

ABSTRACT: Iris sibirica biomass (ISBM) used for cobalt (Co) pollution remediation was prepared by one-step pyrolysis and employed to remove elemental mercury (Hg0) from flue gas. Results showed that the ISBM pyrolyzed at 700 °C (ISBM700) exhibited good Hg0 removal performance (about 86%) at 150 °C. The existence of NO and O2 facilitated the removal of Hg0, while SO2 and water vapor inhibited it. Characterization analysis (including N2 adsorption-desorption, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectrometry) showed that ISBM700 has a relatively higher specific surface area, a quantity of lattice oxygen derived from well-dispersed amorphous-phase CoO x , and abundant oxygen functional groups. A Mars-Maessen mechanism is thought to be involved in the Hg0 removal process. The adsorbed Hg0 could be oxidized to HgO by the surface oxygen species derived from CoO x , and then, the consumed surface oxygen species can be replenished by O2. Therefore, the Co-contaminated I. sibirica biomass (CCIB) from phytoremediation could be utilized for Hg0 removal after being pyrolyzed instead of any chemical modification.

SUBMITTER: Wang Y 

PROVIDER: S-EPMC7114134 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature