Treatment of phenylmercury salts by heterogeneous photocatalysis over TiO2

The recovery and recycling of mercury from fluorescent lamps using photocatalytic techniques

“…In spite of this, the greyish colour of the solid suggests that metallic Hg could also be present at least in minor amounts together with Hg 2 Cl 2 . This result is in agreement with that reported by De la Fournière et al and confirms that mercury reduction takes place by a successive two thermodynamically allowed one‐electron transfer steps 13…”

“…On the one hand, a first‐order kinetic expression fits well with the concentration vs time results for both leaching solutions (Fig. 2), in agreement with that reported by De la Fournière et al for Hg(II) concentrations lower than 100 mg L −1 (0.5 mmol L −1 ) 13. Nevertheless, the first order kinetic constant for the NaOCl‐pH 5.5 solution was higher than that for the acid solution (0.194 min −1 and 0.0916 min −1 , respectively).…”

“…The net effect is the occurrence of one or more redox chemical reactions in the solution where the irradiated semiconductor plays the same role as a catalyst in a thermally activated chemical reaction. In the case of mercury, Hg(II) ions present in water can be chemically reduced according to the following reaction mechanism 12, 13 …”

New Advances in Heterogeneous Photocatalysis for Treatment of Toxic Metals and Arsenic

“…HP appears as a suitable alternative for Hg reduction, and many authors have studied this technology with TiO 2 , ZnO, and wO 3 , exploring the use of UV, visible, and solar irradiation [10,177,[190][191][192][193][194][195][196][197][198][199][200][201][202][203][204][205][206][207]. The main conclusions drawn from published works can be condensed in the following points:…”

Simultaneous determination of thimerosal and aluminum in vaccines and pharmaceuticals with the use of HPLC method

“…Determination of thimerosal in pharmaceuticals is carried out in two ways: as total Hg [26][27][28][29][30][31][32][33][34] or directly as thimerosal [35][36][37][38][39][40][41][42][43][44]. The total Hg determination methods require mineralization and atomization of sample to form mercury vapor.…”