Study on reaction kinetics and selective precipitation of Cu, Zn, Ni and Sn with H2S in single-metal and multi-metal systems

Tokuda, Hiroaki; Kuchař, Dalibor; Mihara, Naoto; Kubota, Mitsuhiro; Matsuda, Hitoki; Fukuta, Tadashi

doi:10.1016/j.chemosphere.2008.07.073

Cited by 34 publications

(19 citation statements)

References 4 publications

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“…In these studies, the precipitation of metals was investigated to make them qualify the Integrated Wastewater Discharge Standard [14]. However, the mechanism of mercury treated by sulfidation agents was not further studied.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic study on reaction path of Hg(II) with S(II) in solution

Chai

Wang

et al. 2010

J. Cent. South Univ. Technol.

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The mercury sulfidation experiments were conducted in the pH range from 1 to 13. The results show that Hg(Ⅱ) reacted with equimolar S(Ⅱ) has the lowest remained Hg(Ⅱ) concentration (9.7 µg/L) at pH 1.0 and the highest remained concentration (940.8 µg/L) at pH 13.0. Meanwhile, the changes of pH values were monitored exactly, which reveal that solution pH values change when mixing the same pH value solutions of HgCl 2 and Na 2 S. In order to explain the phenomena and determine the reaction paths of Hg(Ⅱ) reacting with S(Ⅱ) in the solution, the concerned thermodynamics was studied. Species of S(Ⅱ)-H 2 O system and Hg(Ⅱ)-H 2 O system at different pH values were calculated, and then the species distribution diagrams of S(Ⅱ)-H 2 O system, Hg( Ⅱ )-H 2 O system and Hg( Ⅱ )-Cl − -OH − -H 2 O system were drawn. Combining the experimental data and thermodynamic calculation, the mechanism of Hg(Ⅱ) reacting with S(Ⅱ) was deduced. The results indicate that different species of S(Ⅱ) and Hg(Ⅱ) have the diverse reaction paths to form HgS precipitate at different pH values and the standard Gibbs free energies change ) (∆ Θ m r G of those equations are also calculated, which can provide a guidance for mercury-containing wastewater treatment with Na 2 S.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic study on reaction path of Hg(II) with S(II) in solution

Chai

Wang

et al. 2010

J. Cent. South Univ. Technol.

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“…Thus, it is not surprising that a limited work has been devoted to this objective. The selective recovery of copper, nickel, and zinc by sequential precipitation using sulfides was described (Tokuda et al 2008). However, sulfide toxicity and consequently the safety aspects related with its handling strongly impair its practical application (Huisman et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Selective recovery of chromium, copper, nickel, and zinc from an acid solution using an environmentally friendly process

Machado

Soares

2011

Environ Sci Pollut Res

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Purpose Real electroplating effluents contain multiple metals. An important point related with the feasibility of the bioremediation process is linked with the strategy to recover selectively metals. In this work, a multimetal solution, obtained after microwave acid digestion of the ashes resulted from the incineration of Saccharomyces cerevisiae contaminated biomass, was used to recover selectively chromium, copper, nickel, and zinc. Results The acid solution contained 3.8, 0.4, 2.8, and 0.2 g/L of chromium(III), copper, nickel, and zinc, respectively. The strategy developed consisted of recovering copper (97.6%), as a metal, by electrolyzing the solution at a controlled potential. Then, the simultaneous alkalinization of the solution (pH 14), addition of H 2 O 2 , and heating of the solution led to a complete oxidation of chromium and nickel recovery (87.9% as a precipitate of nickel hydroxide). After adjusting the pH of the remaining solution at pH 10, selective recovery of zinc (82.7% as zinc hydroxide) and chromium (95.4% as a solution of cromate) was achieved. Conclusion The approach, used in the present work, allowed a selective and efficient recovery of chromium, copper, nickel, and zinc from an acid solution using a combined electrochemical and chemical process. The strategy proposed can be used for the selective recovery of metals present in an acid digestion solution, which resulted from the incineration of ashes of biomass used in the treatment of heavy metals rich industrial effluents.

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“…The selective electrodeposition of Cu, Pb, Cd and Zn with high purity (>99 mol%) from a synthetic solution of the metals in the chloride form has been shown (Doulakas et al 2000). On the other hand, a different approach (sulphide precipitation) has been described by Fukuta et al (2004) (quoted by Tokuda et al (2008)); with this strategy, 94.5%, 65.9% and 75.9% of the Cu, Ni and Zn were selectively recovered. Further studies that also used sulphides improved the selective recovery of the same metals more than 95% (Tokuda et al 2008).…”

Section: Selective Recovery Of Metalsmentioning

confidence: 99%

“…On the other hand, a different approach (sulphide precipitation) has been described by Fukuta et al (2004) (quoted by Tokuda et al (2008)); with this strategy, 94.5%, 65.9% and 75.9% of the Cu, Ni and Zn were selectively recovered. Further studies that also used sulphides improved the selective recovery of the same metals more than 95% (Tokuda et al 2008). In a similar way, Cu, Ni and Zn were selectively precipitated with CaS from a simulated plating solution containing the metals at 100 mg/l.…”

Section: Selective Recovery Of Metalsmentioning

confidence: 99%

Bioremediation of industrial effluents containing heavy metals using brewing cells of Saccharomyces cerevisiae as a green technology: a review

Soares

2011

Environ Sci Pollut Res

129

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The release of heavy metals into the environment, mainly as a consequence of anthropogenic activities, constitutes a worldwide environmental pollution problem. Unlike organic pollutants, heavy metals are not degraded and remain indefinitely in the ecosystem, which poses a different kind of challenge for remediation. It seems that the "best treatment technologies" available may not be completely effective for metal removal or can be expensive; therefore, new methodologies have been proposed for the detoxification of metal-bearing wastewaters. The present work reviews and discusses the advantages of using brewing yeast cells of Saccharomyces cerevisiae in the detoxification of effluents containing heavy metals. The current knowledge of the mechanisms of metal removal by yeast biomass is presented. The use of live or dead biomass and the influence of biomass inactivation on the metal accumulation characteristics are outlined. The role of chemical speciation for predicting and optimising the efficiency of metal removal is highlighted. The problem of biomass separation, after treatment of the effluents, and the use of flocculent characteristics, as an alternative process of cell-liquid separation, are also discussed. The use of yeast cells in the treatment of real effluents to bridge the gap between fundamental and applied studies is presented and updated. The convenient management of the contaminated biomass and the advantages of the selective recovery of heavy metals in the development of a closed cycle without residues (green technology) are critically reviewed.

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Study on reaction kinetics and selective precipitation of Cu, Zn, Ni and Sn with H2S in single-metal and multi-metal systems

Cited by 34 publications

References 4 publications

Thermodynamic study on reaction path of Hg(II) with S(II) in solution

Thermodynamic study on reaction path of Hg(II) with S(II) in solution

Selective recovery of chromium, copper, nickel, and zinc from an acid solution using an environmentally friendly process

Bioremediation of industrial effluents containing heavy metals using brewing cells of Saccharomyces cerevisiae as a green technology: a review

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