Hg0 absorption in potassium persulfate solution

Abstract

Abstract:The aqueous phase oxidation of gaseous elemental mercury (Hg 0 ) by potassium persulfate (KPS) catalyzed by Ag + was investigated using a glass bubble column reactor. Concentration of gaseous mercury and potassium persulfate were measured by cold vapor atom absorption (CVAA) and ion chromatograph (IC), respectively. The effects of pH value, concentration of potassium persulfate and silver nitrate (SN), temperature, Hg 0 concentration in the reactor inlet and tertiary butanol (TBA), free radical scavenger, on the removal efficiency of Hg 0 were studied. The results showed that the removal efficiency of Hg 0 increased with increasing concentration of potassium persulfate and silver nitrate, while temperature and TBA were negatively effective. Furthermore, the removal efficiency of Hg 0 was much better in neutral solution than in both acidic and alkaline solution. But the influence of pH was almost eliminated by adding AgNO 3 . High Hg 0 concentration has positive effect. The possible reaction mechanism of gaseous mercury was also discussed.

Polythiophene nanoparticles in aqueous media

“…Literature data indicate that the redox potential of persulfate ions (initiators: potassium persulfate and ammonium persulfate) is 2.01 V and of Fe 3+/ Fe 2+ is 0.771 V, while oxidation potential of the monomer is about 2.0 V . According to this, one can assume that APS and KPS are more effective oxidants than that with Fe 3+ .…”

Mercury Removal from Aqueous Solution by Mixed Mineral Systems II. The Role of Solution Composition and Ageing

“…For Hg0 removal in liquid phase, the key point is to convert Hg0 to Hg2+ rapidly, the latter being easily dissolved in water as reported in literature [25][26][27]. The removal of mercury from contaminated water bodies is controlled by the solution composition and ageing [ 28,29].…”

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“…Instead, it only increased the corrosion of the atomization system equipment. Furthermore, H 2 O 2 was always known as a green oxidizer, thus, it was selected as the liquid‐phase oxidant when verifying the impact of NO . The results are shown in Fig.…”