TY - JOUR
T1 - Nanostructured silica-gel doped with TiO2 for mercury vapor control
AU - Pitoniak, Erik
AU - Wu, Chang Yu
AU - Londeree, Danielle
AU - Mazyck, David
AU - Bonzongo, Jean Claude
AU - Powers, Kevin
AU - Sigmund, Wolfgang
N1 - Funding Information:
This study is partially supported by the STAR program of the US EPA under the Grant No. R-82960201. The authors are also grateful to the partial financial support of NASA ES CSTC under the Grant No. NCC 9-110. The authors are thankful to Ms Nowarat Coowanitwong for carrying out SEM/EDX analyses and Mr Gill Brubaker for helping ICP analyses. The authors also want to acknowledge the assistance of the Particle Engineering Research Center (PERC) and Major Analytical Instrumentation Center (MAIC) at the University of Florida.
PY - 2003/8
Y1 - 2003/8
N2 - A novel high surface area SiO2-TiO2 composite has been developed for elemental mercury vapor removal from combustion sources. The composite exhibits synergistic adsorption and photocatalytic oxidation. Mercury vapor in the gas stream is adsorbed, oxidized and stays on the composite. The composite has demonstrated a high mercury capacity (1512 μg/g) although in its current 3-mm pellet form only the outer layer is effectively utilized. The loading of 13% TiO2 shows the best removal, both with and without UV irradiation. Increasing TiO2 loading beyond this level does not enhance the removal further. It has also been observed that the composite after being 'activated' by photocatalytic oxidation has better performance, probably due to the change of surface functional groups. The examination of the effects of flow velocity reveals that mass transfer is the rate limiting step. Relative humidity has been found to impede adsorption therefore decreasing the overall removal efficiency. By rinsing with acid, both the deposited mercury and composite can be regenerated.
AB - A novel high surface area SiO2-TiO2 composite has been developed for elemental mercury vapor removal from combustion sources. The composite exhibits synergistic adsorption and photocatalytic oxidation. Mercury vapor in the gas stream is adsorbed, oxidized and stays on the composite. The composite has demonstrated a high mercury capacity (1512 μg/g) although in its current 3-mm pellet form only the outer layer is effectively utilized. The loading of 13% TiO2 shows the best removal, both with and without UV irradiation. Increasing TiO2 loading beyond this level does not enhance the removal further. It has also been observed that the composite after being 'activated' by photocatalytic oxidation has better performance, probably due to the change of surface functional groups. The examination of the effects of flow velocity reveals that mass transfer is the rate limiting step. Relative humidity has been found to impede adsorption therefore decreasing the overall removal efficiency. By rinsing with acid, both the deposited mercury and composite can be regenerated.
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U2 - 10.1023/A:1025582731470
DO - 10.1023/A:1025582731470
M3 - Article
AN - SCOPUS:0041375365
SN - 1388-0764
VL - 5
SP - 281
EP - 292
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
IS - 3-4
ER -