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Enhanced Effect of O/N Groups on the Hg-0 Removal Efficiency over the HNO3-Modified Activated Carbon
Tong Li1,2; Xu Wen-Qing1; Qi Hao1,2; Zhou Xuan1; Liu Rui-Hui1; Zhu Ting-Yu1

HNO3-modified activated carbon (AC) was prepared to determine its mercury removal ability on a fixed-bed reactor. In this study, the HNO3-modified AC was found to be effective for mercury removal in simulated flue gas. The original sample, the HNO3-modified sample and the production sample were characterized by elemental analysis, Brunauer-Emmett-Teller (BET) specific surface area measurements, scanning electron microscopy (SEM), Raman spectra, Boehm titrations, temperature programmed desorption (TPD) technique, and X-ray photoelectron spectroscopy (XPS). The results- show that HNO3 treatment increases the content of oxygen and nitrogen on the AC. Compared with the physical characteristics of HNO3-modified AC, the effects of its chemical characteristics on mercury removal are more significant. The Hg-0 is mainly oxidized to HgO by the HNO3-modified AC. The oxygen functional groups, possibly carbonyls, esters or anhydrides were found to be the adsorption sites for mercury removal, and these groups were reduced to hydroxyl groups or ether groups. The N-functional groups, possibly pyrrolic tautomers, were found to be the active catalytic sites. The mechanism for Hg-0 removal by HNO3-modified activated carbon is proposed based on the characterization results.

KeywordElemental Mercury Activated Carbon Hno3- Oxygen Functional Group Nitrogen Functional Group
Subject AreaChemistry
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordElemental Mercury ; Surface-properties ; Fly-ash ; Adsorption ; Oxidation ; Chemistry ; Sorbents ; Fibers ; Oxygen ; Gas
Funding ProjectNational Key Basic Research Program of China (973) [2013CB430005] ; National Hi-Tech Research and Development Program of China (863) [2013AA065501, 2013AA065404]
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000351653100015
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhu Ting-Yu
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing Engn Res Ctr Proc Pollut Control, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Tong Li,Xu Wen-Qing,Qi Hao,et al. Enhanced Effect of O/N Groups on the Hg-0 Removal Efficiency over the HNO3-Modified Activated Carbon[J]. ACTA PHYSICO-CHIMICA SINICA,2015,31(3):512-518.
APA Tong Li,Xu Wen-Qing,Qi Hao,Zhou Xuan,Liu Rui-Hui,&Zhu Ting-Yu.(2015).Enhanced Effect of O/N Groups on the Hg-0 Removal Efficiency over the HNO3-Modified Activated Carbon.ACTA PHYSICO-CHIMICA SINICA,31(3),512-518.
MLA Tong Li,et al."Enhanced Effect of O/N Groups on the Hg-0 Removal Efficiency over the HNO3-Modified Activated Carbon".ACTA PHYSICO-CHIMICA SINICA 31.3(2015):512-518.
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