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Article: Dual Roles of Nano-Sulfide in Efficient Removal of Elemental Mercury from Coal Combustion Flue Gas within a Wide Temperature Range

TitleDual Roles of Nano-Sulfide in Efficient Removal of Elemental Mercury from Coal Combustion Flue Gas within a Wide Temperature Range
Authors
Issue Date2018
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag
Citation
Environmental Science & Technology, 2018, v. 52 n. 21, p. 12926-12933 How to Cite?
AbstractNanostructured zinc sulfide (Nano-ZnS) has been demonstrated to be an efficient adsorbent for removal of elemental mercury (Hg 0 ). However, the Hg 0 removal performance deteriorates once the flue gas temperature deviates from the optimal temperature of 180 °C. In this study, ultraviolet (UV) light, which is generally generated through corona discharge in electrostatic precipitators (ESPs), was adopted to enhance Hg 0 removal by Nano-ZnS. With the UV irradiation, Nano-ZnS exhibited excellent performance in Hg 0 removal within a much wide temperature range from room temperature to 240 °C. A Hg 0 removal efficiency of 99% was achieved at 60 °C even under extremely adverse conditions, that is, gas flow with an extremely high gas hourly space velocity but without hydrogen chloride. At low temperatures, Hg 0 was mainly oxidized by superoxide radicals (•O 2 - ) and hydroxyl radicals (•OH) generated by UV photostimulation to form mercuric oxide (HgO). At high temperatures, most Hg 0 was immobilized as mercuric sulfide (HgS), as both the enhanced chemisorption and the accelerated transformation of HgO to HgS facilitated the formation of HgS. Compared with commercial activated carbon, injection of Nano-ZnS can utilize the UV in ESPs to warrant a higher Hg 0 removal efficiency within a much wider temperature range. © 2018 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/274868
ISSN
2019 Impact Factor: 7.864
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhao, J-
dc.contributor.authorLi, H-
dc.contributor.authorYang, Z-
dc.contributor.authorZhu, L-
dc.contributor.authorZhang, M-
dc.contributor.authorFeng, Y-
dc.contributor.authorQu, W-
dc.contributor.authorYang, J-
dc.contributor.authorShih, K-
dc.date.accessioned2019-09-10T02:30:33Z-
dc.date.available2019-09-10T02:30:33Z-
dc.date.issued2018-
dc.identifier.citationEnvironmental Science & Technology, 2018, v. 52 n. 21, p. 12926-12933-
dc.identifier.issn0013-936X-
dc.identifier.urihttp://hdl.handle.net/10722/274868-
dc.description.abstractNanostructured zinc sulfide (Nano-ZnS) has been demonstrated to be an efficient adsorbent for removal of elemental mercury (Hg 0 ). However, the Hg 0 removal performance deteriorates once the flue gas temperature deviates from the optimal temperature of 180 °C. In this study, ultraviolet (UV) light, which is generally generated through corona discharge in electrostatic precipitators (ESPs), was adopted to enhance Hg 0 removal by Nano-ZnS. With the UV irradiation, Nano-ZnS exhibited excellent performance in Hg 0 removal within a much wide temperature range from room temperature to 240 °C. A Hg 0 removal efficiency of 99% was achieved at 60 °C even under extremely adverse conditions, that is, gas flow with an extremely high gas hourly space velocity but without hydrogen chloride. At low temperatures, Hg 0 was mainly oxidized by superoxide radicals (•O 2 - ) and hydroxyl radicals (•OH) generated by UV photostimulation to form mercuric oxide (HgO). At high temperatures, most Hg 0 was immobilized as mercuric sulfide (HgS), as both the enhanced chemisorption and the accelerated transformation of HgO to HgS facilitated the formation of HgS. Compared with commercial activated carbon, injection of Nano-ZnS can utilize the UV in ESPs to warrant a higher Hg 0 removal efficiency within a much wider temperature range. © 2018 American Chemical Society.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag-
dc.relation.ispartofEnvironmental Science & Technology-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.titleDual Roles of Nano-Sulfide in Efficient Removal of Elemental Mercury from Coal Combustion Flue Gas within a Wide Temperature Range-
dc.typeArticle-
dc.identifier.emailFeng, Y: jerryf@HKUCC-COM.hku.hk-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acs.est.8b04340-
dc.identifier.pmid30351029-
dc.identifier.scopuseid_2-s2.0-85055840934-
dc.identifier.hkuros303530-
dc.identifier.volume52-
dc.identifier.issue21-
dc.identifier.spage12926-
dc.identifier.epage12933-
dc.identifier.isiWOS:000449722200099-
dc.publisher.placeUnited States-

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