Surface chemistry of mercury on zinc and copper
2006 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 37, no 6, 1057-1066 p.Article in journal (Refereed) Published
Thermal desorption Auger electron spectroscopy (TDAES) was used to investigate mercury adsorption on the surfaces of zinc (Zn) and copper (Cu) in the temperature interval of 85 to 298 K. The effects of chlorine and oxygen modifications on the surfaces have also been investigated within the same temperature interval. On single crystalline Zn(0001), no mercury was adsorbed under any temperature or deposition conditions. On polycrystalline Zn at 85 K, a monolayer (ML) of mercury adsorbed, whereas no measurable quantity was observed at room temperature (RT). Predeposited chlorine was removed by exposure to mercury, most probably through formation of volatile HgCl2. Chlorine enhanced the adsorption of mercury on polycrystalline Cu at 87 K, whereas preoxidation reduced the coverage. Low temperatures (LTs) were conducive to mercury adsorption as compared to 298 K for the Cu systems studied. The physisorption of mercury on chlorine and oxygen layers at LTs is discussed, as well as the factors affecting the mechanism of adsorption at RTs. The desorption energies and surface enthalpies have been calculated for each system with mercury adsorption.
Place, publisher, year, edition, pages
2006. Vol. 37, no 6, 1057-1066 p.
atmospheric mercury, chlorine, zno(0001)-zn, adsorption, speciation
IdentifiersURN: urn:nbn:se:kth:diva-16222DOI: 10.1007/BF02735028ISI: 000242967000024ScopusID: 2-s2.0-33846223829OAI: oai:DiVA.org:kth-16222DiVA: diva2:334264
QC 201005252010-08-052010-08-052010-12-20Bibliographically approved