“…Among these mercury species, metallic or elemental mercury (Hg°) has been a concern of environmental protection agencies owing to its anthropogenic sources and vapour nature of its emission into the environment. It has been reported that adsorbents, such as silica-based materials (Johari et al, 2014a;Makkuni et al, 2005;Meyer et al, 2007), metal oxides (He et al, 2013), fly ash (Gao et al, 2013), clay (Cai et al, 2014) and activated carbon (Karatza et al, 2013), have been very promising for capturing elemental mercury in gas streams. It has been reported that adsorbents, such as silica-based materials (Johari et al, 2014a;Makkuni et al, 2005;Meyer et al, 2007), metal oxides (He et al, 2013), fly ash (Gao et al, 2013), clay (Cai et al, 2014) and activated carbon (Karatza et al, 2013), have been very promising for capturing elemental mercury in gas streams.…”