skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Preparation, characterization, and application of modified chitosan sorbents for elemental mercury removal

Abstract

A series of raw, iodine (bromide) or/and sulfuric acid-modified chitosan sorbents were synthesized and comprehensively characterized by N{sub 2} isotherm adsorption/desorption method, TGA, FTIR, XRD, and XPS et al. Adsorption experiments of vapor-phase elemental mercury (Hg{sup 0}) were studied using the sorbents in a laboratory-scale fixed-bed reactor. The results revealed that porosities and specific surface areas of the sorbents decreased after modification. The sorbents operated stably at flue-gas temperature below 140{sup o}C. The chemical reactions of iodine and sulfate ion with the amide of chitosan occurred, and the I{sub 2} was found in the sorbents due to the presence of H{sub 2}SO{sub 4}. Fixed-bed adsorber tests showed that compared to raw chitosan, the bromide or iodine-modified chitosan could promote the efficiency of Hg{sub 0} capture more or less. Mercury removal efficiency could be significantly promoted when an appropriate content of H{sub 2}SO{sub 4} was added, and the iodine and H{sub 2}SO{sub 4} modified sorbents almost had a mercury removal efficiency of 100% for 3 h. The presence of moisture can increase the sorbent's capacity for mercury uptake due to the existence of active sites, such as sulfonate and amino group. The mercury breakthrough of modified chitosan sorbents decreased with increasingmore » temperature. A reaction scheme that could explain the experimental results was presumed based on the characterizations and adsorption study.« less

Authors:
; ; ; ; ; ; ;  [1]
  1. Huazhong University of Science & Technology, Wuhan (China)
Publication Date:
OSTI Identifier:
21187198
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 48; Journal Issue: 10; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CAPTURE; REMOVAL; MERCURY; ADSORBENTS; SORPTIVE PROPERTIES; SULFURIC ACID; IODINE; BROMIDES; ADSORPTION ISOTHERMS; DESORPTION; POROSITY; SURFACE AREA; FLUE GAS; AMIDES; CHEMICAL REACTIONS; MOISTURE; POLYSACCHARIDES; CHITIN

Citation Formats

Zhang, A C, Xiang, J, Sun, L S, Hu, S, Li, P S, Shi, J M, Fu, P, and Su, S. Preparation, characterization, and application of modified chitosan sorbents for elemental mercury removal. United States: N. p., 2009. Web. doi:10.1021/ie9000629.
Zhang, A C, Xiang, J, Sun, L S, Hu, S, Li, P S, Shi, J M, Fu, P, & Su, S. Preparation, characterization, and application of modified chitosan sorbents for elemental mercury removal. United States. https://doi.org/10.1021/ie9000629
Zhang, A C, Xiang, J, Sun, L S, Hu, S, Li, P S, Shi, J M, Fu, P, and Su, S. Fri . "Preparation, characterization, and application of modified chitosan sorbents for elemental mercury removal". United States. https://doi.org/10.1021/ie9000629.
@article{osti_21187198,
title = {Preparation, characterization, and application of modified chitosan sorbents for elemental mercury removal},
author = {Zhang, A C and Xiang, J and Sun, L S and Hu, S and Li, P S and Shi, J M and Fu, P and Su, S},
abstractNote = {A series of raw, iodine (bromide) or/and sulfuric acid-modified chitosan sorbents were synthesized and comprehensively characterized by N{sub 2} isotherm adsorption/desorption method, TGA, FTIR, XRD, and XPS et al. Adsorption experiments of vapor-phase elemental mercury (Hg{sup 0}) were studied using the sorbents in a laboratory-scale fixed-bed reactor. The results revealed that porosities and specific surface areas of the sorbents decreased after modification. The sorbents operated stably at flue-gas temperature below 140{sup o}C. The chemical reactions of iodine and sulfate ion with the amide of chitosan occurred, and the I{sub 2} was found in the sorbents due to the presence of H{sub 2}SO{sub 4}. Fixed-bed adsorber tests showed that compared to raw chitosan, the bromide or iodine-modified chitosan could promote the efficiency of Hg{sub 0} capture more or less. Mercury removal efficiency could be significantly promoted when an appropriate content of H{sub 2}SO{sub 4} was added, and the iodine and H{sub 2}SO{sub 4} modified sorbents almost had a mercury removal efficiency of 100% for 3 h. The presence of moisture can increase the sorbent's capacity for mercury uptake due to the existence of active sites, such as sulfonate and amino group. The mercury breakthrough of modified chitosan sorbents decreased with increasing temperature. A reaction scheme that could explain the experimental results was presumed based on the characterizations and adsorption study.},
doi = {10.1021/ie9000629},
url = {https://www.osti.gov/biblio/21187198}, journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 10,
volume = 48,
place = {United States},
year = {2009},
month = {5}
}