Mercury absorption in aqueous hypochlorite

Zhao, Lynn L.; Rochelle, Gary T.

doi:10.1016/s0009-2509(98)00263-2

Cited by 30 publications

(25 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A study shows that the removal of gaseous mercury for the hypochlorite solution depends mainly on the presence of Cl 2 (Zhao and Rochelle 1999). However, the concentration of chlorine in the hypochlorite solution is defined by the following equilibria:…”

Section: Absorbent Solutionsmentioning

confidence: 99%

“…The highest hypochlorite concentration is chosen based on the maximum AC seen in Figure 2, and the lowest concentration is chosen as 50% of that value. Zhao and Rochelle (1999) have demonstrated that, when using 1.0 mol L −1 NaCl in the presence of sodium hypochlorite, the concentration of mercury in the gas phase is stabilized for their experiments. However, when using 0.1 mol L −1 NaCl, those authors proved that the mercury concentration gradually increased in the gas phase (Zhao and Rochelle 1999 .…”

Section: Absorbent Solutionsmentioning

confidence: 99%

“…Zhao and Rochelle (1999) have demonstrated that, when using 1.0 mol L −1 NaCl in the presence of sodium hypochlorite, the concentration of mercury in the gas phase is stabilized for their experiments. However, when using 0.1 mol L −1 NaCl, those authors proved that the mercury concentration gradually increased in the gas phase (Zhao and Rochelle 1999 . Table 2 shows the results of analysis of variance, and it can be seen that the F values for the main factors (OCl − , Cl − , and EDTA) are significant at the 5% level, but the interactions between these factors are also significant in the same level.…”

Section: Absorbent Solutionsmentioning

confidence: 99%

“…Sizeneva et al (2005) established that the reaction of mercury dissolution in hypochlorite solution is first order. If mercury is considered to be in the gaseous state reacting with the hypochlorite solution, then the reaction is second order (Zhao and Rochelle 1999).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Removal of traces of mercury from a carrier gas for analytical purpose

et al. 2013

View full text Add to dashboard Cite

Background: The analysis of mercury by cold vapor requires a gas, usually argon or helium, to transport elementary mercury to the gold trap or directly to the detector. When analyzing mercury in environmental matrices, a gas with a metal concentration as low as a few picograms per cubic meter is needed. Different sorbents have been used to purify the gas for a long time, but little information is available about them, mainly considering the analytical purpose. This paper presents results of the absorption capacity for solids and hypochlorite solutions that usually are used as mercury sorbents, giving technical information to the analyst to decide the best gas cleaning process to be used. Findings: The absorption capacities of different sorbents were tested using atomic fluorescence spectrometry. Among the tested solids, platinum presented the highest absorption capacity (13.04 pg Hg per gram of Pt). Interaction between sodium hypochlorite, sodium chloride, and EDTA in the absorption capacity was investigated by a 2 3 factorial design. Results showed a significant interaction between hypochlorite and chloride.

show abstract

Section: Absorbent Solutionsmentioning

confidence: 99%

Section: Absorbent Solutionsmentioning

confidence: 99%

Section: Absorbent Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal of traces of mercury from a carrier gas for analytical purpose

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The standard potential of the redox-pair Hg 0 /Hg 2+ is 0.85 V. To achieve complete reaction, the over-potential should be 0.3~0.4 V. Therefore, the standard oxidizing potential of the oxidizers applied should at least be 1.2 V (van der Vaart et al, 2001). Some oxidizers meeting the above criteria are listed as follows: KMnO 4 , K 2 S 2 O 8 (AgNO 3), K2CrO7, H2O2, HgCl2, NaClO4, NaClO3 or Cl 2 (van der Vaart et al, 2001;Morita et al, 1983;Zhao and Rochelle, 1996;1999;House, 1962). The standard oxidizing potential of potassium persulfate (KPS) is 2.01 V, which is higher than that of potassium permanganate (1.7 V).…”

Section: Introductionmentioning

confidence: 99%

Hg0 absorption in potassium persulfate solution

Wang

et al. 2006

J. Zhejiang Univ. - Sci. B

View full text Add to dashboard Cite

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.

show abstract

Removal of Elemental Mercury by Sodium Chlorite Solution

et al. 2008

View full text Add to dashboard Cite

The important step for increasing gaseous elemental mercury (Hg 0 ) removal in wet scrubber systems is altering the chemical form of the Hg 0 to a water-soluble oxidized species. This work focuses on the removal of elemental mercury from simulated flue gas by aqueous sodium chlorite in a bubble reactor. The effects of initial oxidizing solution concentration, reaction temperature, pH and mercury concentration in the inlet of the reactor on mercury oxidative absorption in sodium chlorite were investigated. The results indicate that higher concentrations of sodium chlorite favor Hg 0 removal, with a greater efficiency observed in acidic than in alkaline solution. High temperature inhibits Hg 0 absorption in aqueous sorbent when the reaction temperature is lower than ca. 40°C, and the removal efficiency increases when the temperature is higher than that value. In conclusion, the major influencing factors on the levels of Hg 0 removal are pH and chlorite concentration in solution.

show abstract

Mercury absorption in aqueous hypochlorite

Cited by 30 publications

References 8 publications

Removal of traces of mercury from a carrier gas for analytical purpose

Removal of traces of mercury from a carrier gas for analytical purpose

Hg0 absorption in potassium persulfate solution

Removal of Elemental Mercury by Sodium Chlorite Solution

Contact Info

Product

Resources

About