Heterostructures patterned on aluminosilicate microporous substrates: Crystallization of cobalt(III) tris(N,N-diethyldithiocarbamato) on the surface of a HEU-type zeolite

Radiation and thermal effects on cobalt retention by Mexican aluminosilicates

“…It was found as well [12,13] that the pale-rose to brown layer of Co-containing phases covering the surface of faintly-white zeolite grains is not crystalline, corresponding most probably to a type of amorphous Co(III)-hydroxide and or -oxyhydroxide. This study found that Co(II)-hydroxide precipitated in an aqueous solution is crystalline, and is further rearranged to a black crystalline Co(III)-oxide at $150°C.…”

“…It is important to note that the color of the cobalt exchanged zeolitic materials changed when they were heated and the darkest sample was that treated at 1100°C. Godelitsas and Armbruster [12] and Godelitsas et al [13] have proven that on cobalt-loaded heulandite type zeolite, there is an accumulation of cobalt around the rims of the cobalt-loaded zeolite grains and a lower concentration in the interior. These studies pointed out that the metal sorption was mainly attributed to surface precipitation of insoluble solid phases, while the incorporation of cobalt ions into the structure through the channels also took place by ionexchange.…”

Applications of the Hellenic Natural Zeolite (Henaze) and Specifications of Zeolitic Tuffs

“…These chemical processes are related to sorption and fixation physicochemical phenomena of ions and molecules, and concerns both the structural void spaces (micro/nano-pores) and the surface of the clinoptilolite crystals, consequently the meso-and macro-pores of the HENAZE. The HENAZE shows an ability to neutralize the pH of acidic and basic waters, acting either as a proton acceptor or donor, exhibiting thus an amphoteric character (Misaelides et al, 1995;Godelitsas et al, 2003;Filippidis and Kantiranis, 2007;Filippidis, 2010aFilippidis, , 2013.…”

The Use of Heu-Type Zeolitic Tuff in Sustainable Agriculture: Experimental Study on the Decrease of Nitrate Load in Vadose Zone Leachates

“…The sorption and fixation of the different components from their solutions by the micro/nano-pores of HEU-type zeolite, as well as from meso-and macro-pores of the zeolitic tuff, is attributed to absorption (ion exchange), adsorption and surface precipitation processes (Godelitsas et al, 1999(Godelitsas et al, , 2001(Godelitsas et al, , 2003Fu and Wang, 2011;Kantiranis et al, 2011;Malamis and Katsou, 2013). The HEU-type zeolite is characterized by Brønsted acidic and the Lewis basic active sites, that react with the negatively or/and positively charged chemical components, even with molecules in gas condition.…”

“…These chemical processes are related to sorption and fixation physicochemical phenomena of ions and molecules, and are related both to the structural void spaces (micro/nano-pores) and the surface of the HEU-type zeolite crystals, consequently the meso-and macro-pores of the zeolitic tuff. Finally, HEU-type zeolite shows an ability to neutralize the pH of acidic and basic waters, acting either as a proton acceptor or donor, exhibiting thus an amphoteric character (Misaelides et al, 1995;Godelitsas et al, 1999Godelitsas et al, , 2001Godelitsas et al, , 2003Kantiranis et al, 2011).…”