Mercury

Kaiser, G.; Tölg, G.

doi:10.1007/978-3-540-38522-6_1

Cited by 11 publications

(2 citation statements)

References 344 publications

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“…Mercury, one of the most toxic heavy metal in environmental system, has toxicity accumulation in both inorganic and organic form [1,2]. Besides, mercury can emit from earth's surface to atmosphere in the form of Hg(0), which could remain in atmosphere for a long time (0.5-2a) and then subsides into the surface after a transition over great distances, resulting in the pollution of a large scale [3,4].…”

Section: Introductionmentioning

confidence: 99%

Photoreduction of Hg (II) in the Presence of SO42- under Artificial Solar Radiation

Wang

Yang

et al. 2013

AMR

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Photoreduction of Hg (II) is of great importance but remains not fully understood especially in the presence of SO42-. In this study, laboratory experiments were conducted to investigate the reduction of Hg (Cl)2with various SO42-concentrations under artificial solar radiation. The whole process was tracked by changing Hg (0) concentrations in argon; the rate constants were calculated by trial method and were compared with other experiment. The results show the reaction rate decreased with increasing SO42-concentrations (0-20 mg L-1) and the cause of inhibitory effect is assumed with two explanations. The concentration of Hg (0) in argon increased firstly and decreased later in each treatment, since the main reactions in rising and dropping period are different. The comparison indicates that reduction rate is influenced by combined factors such as the form of mercury, the quantity of DOM and TSSs, depth of water and quality of light source.

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Section: Introductionmentioning

confidence: 99%

Photoreduction of Hg (II) in the Presence of SO42- under Artificial Solar Radiation

Wang

Yang

et al. 2013

AMR

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“…Mercury compounds exhibit remarkably toxic activity in both organic and inorganic form in concentrations higher than 5 ppb ( , ). Consequently, it is no surprise that mercury is included in the list of priority pollutants of the U.S. EPA, with a disposal limit of 200 ppb (), while the European Union has determined a maximum concentration limit for mercury at 1 ppb for natural mineral water ().…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reduction and Recovery of Mercury by Polyoxometalates

Gkika

Troupis

Hiskia

et al. 2005

Environ. Sci. Technol.

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Photocatalytic reduction of mercury in aqueous solutions using PW12O40(3-) or SiW12O40(4-) as photocatalysts has been studied as a function of irradiation time, concentration of Hg(II), polyoxometalate, and organic substrate in the presence or absence of dioxygen. The photocatalytic cycle starts with irradiation of polyoxometalate, goes through the oxidation of, for instance, propan-2-ol (used as sacrificial reagent), and closes with the reoxidation of reduced polyoxometalate by Hg2+ ions. Mercury(II) is reduced to mercury(I) and finally to Hg(0) giving a dark-gray deposit, following a staged one-by-one electron process and a first-order kinetics in [Hg2+]. The process is slightly more efficient in the absence of dioxygen, while the increase of either catalyst or propan-2-ol concentration results in the augmentation of the rate of reduction till a certain point where it reaches a plateau. The results show that this method is suitable for a great range of mercury concentration from 20 to 800 ppm achieving almost complete recovery of mercury up to nondetected traces (<50 ppb). In addition, this homogeneous process demonstrates advantages such as the lack of necessity for separation of the zero state metal from the catalyst and ensures that the precipitation of metal will not poison the catalyst or hinder its photocatalytic activity.

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