Kinetics and Mechanism of Oxidations by Peroxydisulfate.

House, Donald A.

doi:10.1021/cr60217a001

Cited by 868 publications

(456 citation statements)

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“…21), transitional metals (Eq. 22), or elevated pH, S 2 O 8 2− can form more powerful sulfate radicals (SO 4 ·− , E o =2.6 V) to initiate sulfate radicalbased advanced oxidation processes [13,14].…”

Section: Other Aopsmentioning

confidence: 99%

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

2015

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Advanced oxidation processes (AOPs) were first proposed in the 1980s for drinking water treatment and later were widely studied for treatment of different wastewaters. During the AOP treatment of wastewater, hydroxyl radicals (OH·) or sulfate radicals (SO 4 ·− ) are generated in sufficient quantity to remove refractory organic matters, traceable organic contaminants, or certain inorganic pollutants, or to increase wastewater biodegradability as a pre-treatment prior to an ensuing biological treatment. In this paper, we review the fundamental mechanisms of radical generation in different AOPs and select landfill leachate and biologically treated municipal wastewater as model wastewaters to discuss wastewater treatment with different AOPs. Generally, the treatment efficiencies rely heavily upon the selected AOP type, physical and chemical properties of target pollutants, and operating conditions. It would be noted that other mechanisms, besides hydroxyl radical or sulfate radical-based oxidation, may occur during the AOP treatment and contribute to the reduction of target pollutants. Particularly, we summarize recent advances in the AOP treatment of landfill leachate, as well as advanced oxidation of effluent organic matters (EfOM) in biologically treated secondary effluent (BTSE) for water reuse.

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Section: Other Aopsmentioning

confidence: 99%

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

2015

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“…It was obvious that the presence of both H + and OH − , especially OH − , greatly weaken the Hg 0 oxidation when silver nitrite was absent. The mechanism is given by the following reactions (House, 1962 (House, 1962). …”

Section: Methodsmentioning

confidence: 99%

“…The more the silver nitrate concentration is, the higher the mercury removal in our study. The reaction rate is proportional to the KPS concentration and to the AgNO 3 concentration (House, 1962). Fig.4 gives the results on effect of TBA on mercury removal.…”

Section: Effect Of K 2 S 2 O 8 /Agno 3 Concentrationmentioning

confidence: 99%

“…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%

“…The standard oxidizing potential of potassium persulfate (KPS) is 2.01 V, which is higher than that of potassium permanganate (1.7 V). The general catalysts found in the literature include copper and silver ions (House, 1962), manganese (House, 1962;Lenka and Dash, 1983;Kislenko et al, 1997), cerium (House, 1962;Skarzewski, 1984), and cobalt (Lenka and Dash, 1983). Liang et al(2004a;2004b) studied persulfate oxidation in situ remediation of trichloroethylene (TCE) catalyzed by ferrous ion.…”

Section: Introductionmentioning

confidence: 99%

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Hg0 absorption in potassium persulfate solution

Wang

et al. 2006

J. Zhejiang Univ. - Sci. B

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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.

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