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http://dx.doi.org/10.12989/mwt.2018.9.6.405

Chemistry of persulfates for the oxidation of organic contaminants in water  

Lee, Changha (School of Chemical and Biological Engineering, Institute of Chemical Process (ICP), Seoul National University)
Kim, Hak-Hyeon (School of Urban and Environmental Engineering, UNIST)
Park, Noh-Back (National Institute of Fisheries Science (NIFS))
Publication Information
Membrane and Water Treatment / v.9, no.6, 2018 , pp. 405-419 More about this Journal
Abstract
Persulfates (i.e., peroxymonosulfate and peroxydisulfate) are capable of oxidizing a wide range of organic compounds via direct reactions, as well as by indirect reactions by the radical intermediates. In aqueous solution, persulfates undergo self-decomposition, which is accelerated by thermal, photochemical and metal-catalyzed methods, which usually involve the generation of various radical species. The chemistry of persulfates has been studied since the early twentieth century. However, its environmental application has recently gained attention, as persulfates show promise in in situ chemical oxidation (ISCO) for soil and groundwater remediation. Persulfates are known to have both reactivity and persistence in the subsurface, which can provide advantages over other oxidants inclined toward either of the two properties. Besides the ISCO applications, recent studies have shown that the persulfate oxidation also has the potential for wastewater treatment and disinfection. This article reviews the chemistry regarding the hydrolysis, photolysis and catalysis of persulfates and the reactions of persulfates with organic compounds in aqueous solution. This article is intended to provide insight into interpreting the behaviors of the contaminant oxidation by persulfates, as well as developing new persulfate-based oxidation technologies.
Keywords
persulfate; peroxymonosulfate; peroxydisulfate; in situ chemical oxidation (ISCO); soil and groundwater remediation; oxidation; sulfate radical;
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1 House, D.A. (1962), "Kinetics and mechanism of oxidations by peroxydisulfate", Chem. Rev., 62(3), 185-203.   DOI
2 Huang, K.C., Couttenye, R.A. and Hoag, G.E. (2002), "Kinetics of heat-assisted persulfate oxidation of methyl tert-butyl ether (MTBE)", Chemopshere, 49(4), 413-420.   DOI
3 Neta, P., Huie, R.E. and Ross, A.B. (1988), "Rate constants for reactions of inorganic radicals in aqueous solution", J. Phys. Chem. Ref. Data, 17(3), 1027-1284.   DOI
4 Huie, R.E. and Neta, P. (1984), "Chemical behavior of $SO_3^^-$ and $SO_5^^-$ radicals in aqueous solutions", J. Phys. Chem., 88(23), 5665-5669.   DOI
5 Hug, S.J. and Leupin, O. (2003), "Iron-catalyzed oxidation of arsenic(III) by oxygen and by hydrogen peroxide: pHdependent formation of oxidant in the Fenton reaction", Environ. Sci. Technol., 37(12), 2734-2742.   DOI
6 Huh, J.H. and Ahn, J.W. (2017), "A perspective of chemical treatment for cyanobacteria control toward sustainable freshwater development", Environ. Eng. Res., 22(1), 1-11.   DOI
7 Huie, R.E., Clifton, C.L. and Neta, P. (1991), "Electron transfer reaction rates and equilibria of the carbonate and sulfate radical anions", J. Radiat. Appl. Instrum. Part C. Radiat. Phys. Chem., 38(5), 477-481.
8 Huling, S.G. and Pivetz, B. (2006), "In-Situ Chemical Oxidation - Engineering Issue", EPA/600/R-06/072; US Environmental Protection Agency, National Risk Management Research Laboratory, R.S. Kerr Environmental Research Center, Ada, OK, U.S.A.
9 Ogata, Y. and Akada, T. (1970), "Kinetics and orientation in the peroxydisulfate oxidation of phenol", Tetrahedron, 26(24), 5945-5951.   DOI
10 Neta, P., Huie, R.E. and Ross, A.B. (1990), "Rate constants for reactions of peroxyl radicals in fluid solutions", J. Phys. Chem. Ref. Data, 19(2), 413-513.   DOI
11 Palme, H. (1920). "Studies on the disintegration of sulphuric acid", Z. Anorg. Allgem. Chem., 112(1), 97-130.   DOI
12 Pignatello, J.J., Oliveros, E. and MacKay, A. (2006), "Advanced oxidation processes for organic contaminant destruction based on the Fenton reaction and related chemistry", Crit. Rev. Environ. Sci. Technol., 36(1), 1-84.   DOI
13 Rastogi, A., Al-Abed, S.R. and Dionysiou, D.D. (2009), "Sulfate radical-based ferrous-peroxymonosulfate oxidative system for PCBs degradation in aqueous and sediment systems", Appl. Cat. B: Environ., 85(3-4), 171-179.   DOI
14 Renganathan, R. and Maruthamuthu, P. (1986), "Kinetics and mechanism of oxidation of aromatic aldehydes by peroxomonosulphate", J. Chem. Soc. Perkin Trans. 2, 2, 285-289.
15 Roebke, W., Renz, M. and Henglein, A. (1969), "Pulseradiolyse der anionen $S_2O_8^{2-}$ und $HSO_5^^-$ in Wassriger Losung", J. Radiat. Phys. Chem., 1(1), 39-44.   DOI
16 Rothschild, W.G. and Allen, A.O. (1958), "Studies in the radiolysis of ferrous sulfate solutions III: Air-free solutions at higher pH", Radiat. Res., 8(2), 101-110.   DOI
17 Anipsitakis, G.P. and Dionysiou, D.D. (2004), "Radical generation by the interaction of transition metals with common oxidants", Environ. Sci. Technol., 38(13), 3705-3712.   DOI
18 Ahmad, M., Teel, A.L. and Watts, R.J. (2013), "Mechanism of persulfate activation by phenols", Environ. Sci. Technol., 47(11), 5864-5871.   DOI
19 Ando, W., Miyazaki, H. and Akasaka, T. (1983), "Oxidative ring cleavage of o-benzoquinone by potassium peroxomonosulphate", J. Chem. Soc. Chem. Comm., 9, 518-519.
20 Anipsitakis, G.P. and Dionysiou, D.D. (2003), "Degradation of organic contaminants in water with sulfate radicals generated by the conjunction of peroxymonosulfate with cobalt", Environ. Sci. Technol., 20(37), 4790-4797.
21 Jayson, G.G. and Parsons, B.J. (1972), "Oxidation of ferrous ions by perhydroxyl radicals", Trans. Faraday Soc., 68, 236-242.
22 Hynes, A.J. and Wine, P.H. (1988), "Time-resolved resonance Raman study of the spectroscopy and kinetics of the $Cl_2^^-$ radical anion in aqueous solution", J. Chem. Phys., 89(6), 3565-3572.   DOI
23 Ike, I.A., Linden, K.G., Orbell, J.D. and Duke, M. (2018), "Critical review of the science and sustainability of persulphate advanced oxidation processes", Chem. Eng. J., 338, 651-669.   DOI
24 Ivanov, K.L., Glebov, E.M., Plyusnin, V.F., Ivanov, Y.V., Grivin, V.P. and Bazhin, N.M. (2000), "Laser flash photolysis of sodium persulfate in aqueous solution with additions of dimethylformamide", J. Photochem. Photobiol. A: Chem., 133(1-2), 99-104.   DOI
25 Kanakaraj, P. and Maruthamuthu, P. (1983), "Photochemical reactions of peroxomonosulfate in the presence and absence of 2-propanol", J. Chem. Kinet., 15(12), 1301-1310.   DOI
26 Ball, D.L. and Edwards, J.O. (1956), "The kinetics and mechanism of the decomposition of Caro's acid: I", J. Am. Chem. Soc., 78(6), 1125-1129.   DOI
27 Bao, Z.C. and Barker, J.R. (1996), "Temperature and ionic strength effects on some reactions involving sulfate radical [$SO_4^^-$(aq)]", J. Phys. Chem., 100(23), 9780-9787.   DOI
28 Bard, A.J., Parsons, R. and Jordan, J. (1985), Standard Potentials in Aqueous Solution, Marcel Dekker, Inc., New York, U.S.A.
29 Jiang, P.Y., Katsumura, Y., Nagalshi, R., Domae, M., Ishikawa, K., Ishigure, K. and Yoshida, Y. (1992), "Pulse radiolysis study of concentrated sulfuric acid solutions", J. Chem. Soc. Faraday Trans., 88(12), 1653-1658.   DOI
30 Johnson, R.L., Tratnyek, P.G. and Johnson, R.O. (2008), "Persulfate persistence under thermal activation conditions", Environ. Sci. Technol., 42(24), 9350-9356.   DOI
31 Kennedy, R.J. and Stock, A.M. (1960), "The oxidation of organic substances by potassium peroxymonosulfate", J. Org. Chem., 25(11), 1901-1906.   DOI
32 Schumb, W.C. and Rittner, E.S. (1940), "The effect of the application of sonic energy to the hydrolysis of potassium persulfate", J. Am. Chem. Soc., 62(12), 3416-3420.   DOI
33 Rush, J.D. and Bielski, B.H.J. (1985), "Pulse radiolytic studies of the reactions of $HO_2/O_2^-$ with Fe(II)/Fe(III) ions: The reactivity of $HO_2/O_2^-$ with ferric ions and its implication on the occurrence of the Harber-Weiss reaction", J. Phys. Chem., 89(23), 5062-5066.   DOI
34 Schuchmann, M.N. and von Sonntag, C. (1979), "Hydroxyl radical-induced oxidation of 2-methyl-2propanol in oxygenated aqueous solution: A product and pulse radiolysis study", J. Phys. Chem., 83(7), 780-784.   DOI
35 Schuchmann, H.P., Deeble, D.J., Olbrich, G. and von Sontag, C. (1987), "The $SO_4^^{{\cdot}-}$-induced chain reaction of 1,3-dimethyluracil with peroxodisulphate", J. Radiat. Biol., 51(3), 441-453.
36 Schwarz, H.A. and Dodson, R.W. (1984), "Equilibrium between hydroxyl radicals and Thallium(II) and the oxidation potential of OH(aq)", J. Phys. Chem., 88(16), 3643-3647.   DOI
37 Siegrist, R.L., Urynowicz, M.A., West, O.R., Crimi, M.L. and Lowe, K.S. (2001), Principles and Practices of In Situ Chemical Oxidation Using Permanganate, Battelle Press, Columbus, OH, U.S.A.
38 Singh, U.C. and Venkatarao, K. (1976), "Decomposition of Peroxodisulphate in Aqueous Alkaline Solution", J. Inorg. Nucl. Chem., 38(3), 541-543.   DOI
39 Smith, W.V. and Campbell, H.N. (1947), "The detection of radioactive persulfate fragments in emulsion polymerized styrene", J. Chem. Phys., 15(5), 338.   DOI
40 Spiro, M. (1979), "The standard potential of the peroxosulphate/sulphate couple", Electrochim. Acta, 24(3), 313-314.   DOI
41 Anipsitakis, G.P., Dionysiou, D.D. and Gonzalez, M.A. (2006), "Cobalt-mediated activation of peroxymonosulfate and sulfate radical attack on phenolic compounds: Implications of chloride ions", Environ. Sci. Technol., 40(3), 1000-1007.   DOI
42 Bartlett, P.D. and Cotman, J.D. (1949), "The kinetics of the decomposition of potassium persulfate in aqueous solutions of methanol", J. Am. Chem. Soc., 71(4), 1419-1422.   DOI
43 Bartlett, P.D. and Nozaki, K. (1948), "Polymerization of allyl compounds: IV. Emulsion polymerization of allyl acetate", J. Polymer Sci., 3(2), 216-222.   DOI
44 Anipsitakis, G.P., Stathatos, E. and Dionysiou, D.D. (2005), "Heterogeneous activation of oxone using $Co_3O_4$", J. Phys. Chem. B, 109(27), 13052-13055.   DOI
45 Behrman, E.J. (1967), "Studies on the reaction between peroxydisulfate ions and aromatic amines: Boyland-Sims oxidation", J. Am. Chem. Soc., 89(10), 2424-2428.   DOI
46 Behrman, E.J. and Walker, P.P. (1962), "The Elbs peroxydisulfate oxidation: Kinetics", J. Am. Chem. Soc., 84(18), 3454-3457.   DOI
47 Beylerian, M.M. and Khachatrian, A.G. (1984), "The mechanism of the oxidation of alcohols and aldehydes with peroxydisulphate ion", J. Chem. Soc. Perkin Trans. 2, 12, 1937-1941.
48 Kim, J. and Edwards, J.O. (1995), "A study of cobalt catalysis and copper modification in the coupled decompositions of hydrogen peroxide and peroxomonosulfate ion", Inorg. Chim. Acta, 235(1-2), 9-13.   DOI
49 Khan, J.A., He, X.X., Khan, H.M., Shah, N.S. and Dionysiou, D.D. (2013), "Oxidative degradation of atrazine in aqueous solution by $UV/H_2O_2/Fe^{2+},\;UV/S_2O_8^^{2-}/Fe^{2+}$ and UV/$HSO_5^^-$/$Fe^{2+}$ processes: A comparative study", Chem. Eng. J., 218, 376-383.   DOI
50 Khan, S., He, X.X., Khan, H.M., Boccelli, D. and Dionysiou, D.D. (2016), "Efficient degradation of lindane in aqueous solution by iron (II) and/or UV activated peroxymonosulfate", J. Photochem. Photobiol. A: Chem., 316, 37-43.   DOI
51 King, D.W., Lounsbury, H.A. and Millero, F.J. (1995), "Rates and mechanism of Fe(II) oxidation at nanomolar total iron concentrations", Environ. Sci. Technol., 29(3), 818-824.   DOI
52 Klaning, U.K., Sehested, K. and Holcman, J. (1985), "Standard gibbs energy of formation of the hydroxyl radical in aqueous solution. Rate constants for the reaction $ClO_2^^-+O_3{\leftrightarrows}O_3^^-+ClO_2$", J. Phys. Chem., 89(5), 760-763.   DOI
53 Brandt, C. and van Eldik, R. (1995), "Transition metal-catalyzed oxidation of sulfur(IV) oxides: Atmospheric-relevant processes and mechanisms", Chem. Rev., 95(1), 119-190.   DOI
54 Bielski, B.H.J., Cabelli, D.E., Arudi, R.L. and Ross, A.B. (1985), "Reactivity of $HO_2/O_2^-$ radicals in aqueous solution", J. Phys. Chem. Ref. Data, 14(4), 1041-1100.   DOI
55 Kolthoff, I.M. and Miller, I.K. (1951), "The chemistry of persulfate: I. The kinetics and mechanism of the decomposition of the persulfate ion in aqueous medium", J. Am. Chem. Soc., 73(7), 3055-3059.   DOI
56 Kolthoff, I.M., Meehan, E.J. and Carr, E.M. (1953), "Mechanism of initiation of emulsion polymerization by persulfate", J. Am. Chem. Soc., 75(6), 1439-1441.   DOI
57 Koppenol, W.H. and Liebman J.F. (1984), "The oxidizing nature of the hydroxyl radical. A comparison with the ferryl ion", J. Phys. Chem., 88(1), 99-101.   DOI
58 Srivastava, S.P. Gupta, V. K., Sharma, R.G. and Singh, K.P. (1984), "Kinetics of Ag(I) catalyzed oxidation of dioxane by peroxydisulfate", React. Kinet. Catal. Lett., 24(1-2), 167-172.   DOI
59 Srivastava, S.P., Maheshwari, G.L. and Singhal, S.K. (1974), "Kinetics of oxidation of benzaldehyde by peroxydisulfate", Indian J. Chem., 12(1), 72-74.
60 Boyland, E., Manson, D. and Sims, P. (1953), "The preparation of o-aminophenyl sulphates", J. Chem. Soc., 3623-3628.
61 Buxton, G.V., Greenstock, C.L., Helman, W.P. and Ross, A.B. (1988), "Critical review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution", J. Phys. Chem. Ref. Data, 17(2), 513-886.   DOI
62 Chen, J., Fang, C., Xia, W., Huang, T. and Huang, C.H. (2018), "Selective transformation of ${\beta}$-lactam antibiotics by peroxymonosulfate: Reaction kinetics and nonradical mechanism", Environ. Sci. Technol., 52(3), 1461-1470.   DOI
63 Crist, R.H. (1932), "The quantum efficiency of the photochemical decomposition of potassium persulfate", J. Am. Chem. Soc., 54(10), 3939-3942.   DOI
64 Deborde, A. and von Gunten, U. (2008), "Reactions of chlorine with inorganic and organic compounds during water treatment-Kinetics and mechanisms: A critical review", Water Res., 42(1-2), 13-51.   DOI
65 Dogliotti, L. and Hayon, E. (1967), "Flash photolysis of per[oxydi]sulfate ions in aqueous solutions: The sulfate and ozonide radical anions", J. Phys. Chem., 71(8), 2511-2516.   DOI
66 Eberson, L. (1982), "Electron-transfer reactions in organic chemistry", Adv. Phys. Org. Chem., 18, 79-185.
67 Elias, H., Gotz, U. and Wannowius, K.J. (1994), "Kinetics and mechanism of the oxidation of sulfur(IV) by peroxomonosulfuric acid anion", Atmos. Environ., 28(3), 439-448.   DOI
68 Levitt, L.S., Levitt, B.W. and Malinowski, E.R. (1962), "The kinetics of the persulfate oxidation of 2-propanol in the presence of other organic compounds", J. Org. Chem., 27(8), 2917-2918.   DOI
69 Kurukutla, A.B., Kumar, P.S.S., Anandan, S. and Sivasankar, T. (2015), "Sonochemical degradation of Rhodamine B using oxidants, hydrogen peroxide / peroxydisulfate / peroxymonosulfate, with $Fe^{2+}$ ion: Proposed pathway and kinetics", Environ. Eng. Sci., 32(2), 129-140.   DOI
70 Lente, G., Kalmar, J., Baranyai, Z., Kun, A., Kek, I., Bajusz, D., Takacs, M., Veres, L. and Fabian, I. (2009), "One- versus two-electron oxidation with peroxomonosulfate ion: Reactions with iron(II), vanadium(IV), halide ions and photoreaction with cerium(III)", Inorg. Chem., 48(4), 1763-1773.   DOI
71 Li, S.X., Wei, D., Mak, N.K., Cai, Z.W., Xu, X.R., Li, H.B. and Jiang, Y. (2009), "Degradation of diphenylamine by persulfate: Performance optimization, kinetics and mechanism", J. Hazard. Mater., 164(1), 26-31.   DOI
72 Liang, C., Bruell, C.J., Marley M.C. and Sperry, K.L. (2003), "Thermally activated persulfate oxidation of trichloroethylene (TCE) and 1, 1, 1-trichloroethane in aqueous systems and soil slurries", Soil Sediment Contam., 12(2), 207-228.   DOI
73 Tsitonaki, A., Petri, B., Crimi, M., Mosbæk, H., Siegrist, R.L. and Bjerg, P.L. (2010), "In situ chemical oxidation of contaminated soil and groundwater using persulfate: A review", Crit. Rev. Environ. Sci. Technol., 40(1), 55-91.   DOI
74 Steele, W.V. and Appelman, E.H. (1982), "The standard enthalpy of formation of peroxymonosulfate ($HSO_5^^-$) and the standard electrode potential of the peroxymonosulfate-bisulfate couple", J. Chem. Thermodyn., 14(4), 337-344.   DOI
75 Tang, Y., Thorn, R.P., Mauldin, R.L. III and Wine, P.H. (1988), "Kinetics and spectroscopy of the $SO_4^^-$ radical in aqueous solution", J. Photochem. Photobiol. A: Chem., 44(3), 243-258.   DOI
76 Thompson, R.C. (1981), "Catalytic decomposition of peroxymonosulfate in aqueous perchloric acid by the dual catalysts $Ag^+$ and $S_2O_8^{2-}$ and by $Co^{2+}$", Inorg. Chem., 20(4), 1005-1010.   DOI
77 von Gunten, U. (2003a), "Ozonation of drinking water: Part I. Oxidation kinetics and product formation", Water Res., 37(7), 1443-1467.   DOI
78 von Gunten, U. (2003b), "Ozonation of drinking water: Part II. Disinfection and by-product formation in presence of bromide, iodide or chlorine", Water Res., 37(7), 1469-1487.   DOI
79 von Gunten, U. (2018), "Oxidation processes in water treatment: Are we on track?", Environ. Sci. Technol., 52(9), 5062-5075.   DOI
80 Liang, C., Bruell, C.J., Marley, M.C. and Sperry, K.L. (2004a), "Persulfate oxidation for in situ remediation of TCE: I. Activation by ferrous ion with and without a persulfatethiosulfate redox couple", Chemosphere, 55(9), 1213-1223.   DOI
81 Liang, C., Bruell, C.J., Marley, M.C. and Sperry, K.L. (2004b), "Persulfate oxidation for in situ remediation of TCE: II. Activated by chelated ferrous ion", Chemosphere, 55(9), 1225-1233.   DOI
82 Furman, O.S., Teel, A.L. and Watts, R.J. (2010), "Mechanism of base activation of persulfate", Environ. Sci. Technol., 44(16), 6423-6428.   DOI
83 Waclawek, S., Lutze, H.V., Grubel, K., Padil, V.V.T., Cernik, M. and Dionysiou, D.D. (2017), "Chemistry of persulfates in water and wastewater treatment: A review", Chem. Eng. J., 330, 44-62.   DOI
84 Evans, D.F. and Upton, M.W. (1985), "Studies on singlet oxygen in aqueous solution: Part 3. The decomposition of peroxyacids", J. Chem. Soc. Dalton Trans., 6, 1151-1153.
85 Furholz, U. and Haim, A. (1987), "Kinetics and mechanisms of the reactions of mononuclear and binuclear ruthenium(II) ammine complexes with peroxydisulfate", Inorg. Chem., 26(20), 3243-3248.   DOI
86 Fang, G.D., Gao, J., Dionysiou, D.D., Liu, C. and Zhou, D.M. (2013), "Activation of persulfate by quinones: Free radical reactions and implication for the degradation of PCBs", Environ. Sci. Technol., 47(9), 4605-4611.   DOI
87 Fang, G.D., Wu, W.H., Deng, Y.M. and Zhou, D.M. (2017), "Homogenous activation of persulfate by different species of vanadium ions for PCBs degradation", Chem. Eng. J., 323, 84-95.   DOI
88 Gallopo, A.R. and Edwards, J.O. (1971), "Kinetics and mechanisms of the spontaneous and metal-modified oxidations of ethanol by peroxydisulfate ion", J. Org. Chem., 36(26), 4089-4096.   DOI
89 Gallopo, A.R. and Edwards, J.O. (1981), "Kinetics and mechanism of the oxidation of pyridine by Caro's acid catalyzed by ketones", J. Org. Chem., 46(8), 1684-1688.   DOI
90 Gilbert, B.C., Stell, J.K. and Jeff, M. (1988), "Electron spin resonance studies of the effect of copper(II) and copper(I) on the generation and reactions of organic radicals formed from the Fenton reaction and the $Ti^{III}-H_2O_2$ and $Ti^{III}-S_2O_8^^{2-}$ redox couples", J. Chem. Soc. Perkin Trans. 2, 10, 1867-1873.
91 Liang, C., Lee, I.L., Hsu, I.Y., Liang, C.P. and Lin, Y.L. (2008a), "Persulfate oxidation of trichloroethylene with and without iron activation in porous media", Chemosphere, 70(3), 426-435.   DOI
92 Liang, C., Wang, Z.S. and Bruell, C.J. (2007a), "Influence of pH on persulfate oxidation of TCE at ambient temperatures", Chemopshere, 66(1), 106-113.   DOI
93 Liang, C., Huang, C.F., Mohanty, N., Lu, C.J. and Kurakalva, R.M. (2007b), "Hydroxypropyl-${\beta}$-cyclodextrin-mediated ironactivated persulfate oxidation of trichloroethylene and tetrachloroethylene", Ind. Eng. Chem. Res., 46(20), 6466-6479.   DOI
94 Liang, C. and Bruell, C.J. (2008), "Thermally activated persulfate oxidation of trichloroethylene: Experimental investigation of reaction orders", Ind. Eng. Chem. Res., 47(9), 2912-2918.   DOI
95 Liang, C., Huang, C.F. and Chen, Y.J. (2008b), "Potential for activated persulfate degradation of BTEX contamination", Water Res., 42(15), 4091-4100.   DOI
96 Liang, C. and Su, H.W. (2009), "Identification of sulfate and hydroxyl radicals in thermally activated persulfate", Ind. Eng. Chem. Res., 48(11), 5558-5562.   DOI
97 Lunenok-Burmakina, V.A. and Aleeva, G.P. (1972), "Mechanism of the decomposition of peroxomonosulphates and peroxomonophosphates in alkaline aqueous solution", Russ. J. Phys. Chem., 46, 1591-1592.
98 Wang, J.L. and Wang, S.Z. (2018), "Activation of persulfate (PS) and peroxymonosulfate (PMS) and application for the degradation of emerging contaminants", Chem. Eng. J., 334, 1502-1517.   DOI
99 Waldemer, R.H., Tratnyek, P.G., Johnson, R.L. and Nurmi, J.T. (2007), "Oxidation of chlorinated ethenes by heat-activated persulfate: Kinetics and products", Environ. Sci. Technol., 41(3), 1010-1015.   DOI
100 Walling, C. and Goosen, A. (1973), "Mechanism of the ferric ion catalyzed decomposition of hydrogen peroxide", J. Am. Chem. Soc., 95(9), 2987-2991.   DOI
101 Wang, Y.R. and Chu, W. (2011), "Degradation of a xanthene dye by Fe(II)-mediated activation of Oxone process", J. Hazard. Mater., 186(2-3), 1455-1461.   DOI
102 Watts, R.J., Ahmad, M., Hohner, A.K. and Teel, A.L. (2018), "Persulfate activation by glucose for in situ chemical oxidation", Water Res., 133, 247-254.   DOI
103 Wilmarth, W.K., Schwartz, N. and Giuliano, C.R. (1983), "The aqueous chemistry of peroxydisulfate ion: VII. The free radical induced chain hydrogenation", Coord. Chem. Rev., 51(2), 243-265.   DOI
104 Wine, P.H., Mauldin, R.L.III and Thorn, R.P. (1988), "Kinetics and spectroscopy of the $NO_3$ radical in aqueous ceric nitratenitric acid solutions", J. Phys. Chem., 92(5), 1156-1162.   DOI
105 Xiao, R., Ye, T., Wei, Z., Luo, S., Yang, Z. and Spinney, R. (2015), "Quantitative structure-activity relationship (QSAR) for the oxidation of trace organic contaminants by sulfate radical", Environ. Sci. Technol., 49(22), 13394-13402.   DOI
106 Zhu, W. and Ford, W.T. (1991), "Oxidation of alkenes with aqueous potassium peroxymonosulfate and no organic solvent", J. Org. Chem., 56(25), 7022-7026.   DOI
107 Manivannan, G. and Maruthamuthu, P. (1986), "Kinetics and mechanism of oxidation of aliphatic and aromatic ketones by peroxomonosulphate", J. Chem. Soc. Perkin Trans. 2, 4, 565-568.
108 Mariano, M.H. (1968), "Spectrophotometric analysis of sulfuric solutions of hydrogen peroxide, peroxymonosulfuric acid and peroxydisulfuric acid", Anal. Chem., 40(11), 1662-1667.   DOI
109 Yang, Y., Banerjee, G., Brudvig, G.W., Kim, J.H. and Pignatello, J.J. (2018), "Oxidation of organic compounds in water by unactivated peroxymonosulfate", Environ. Sci. Technol., 52(10), 5911-5919.   DOI
110 Zou, J., Ma, J., Chen, L.W., Li, X.C., Guan, Y.H., Xie, P.C. and Pan, C. (2013), "Rapid acceleration of ferrous Iron/peroxymonosulfate oxidation of organic pollutants by promoting Fe(III)/Fe(II) cycle with hydroxylamine', Environ. Sci. Technol., 47(20), 11685-11691.   DOI
111 Heidt, L.J. (1942), "The photolysis of persulfate", J. Phys. Chem., 10(5), 297-302.   DOI
112 Gilbert, B.C. and Stell, J.K. (1990), "Mechanisms of peroxide decomposition: An ESR study of the reactions of the peroxomonosulphate anion ($HOOSO_3^-$) with $Ti^{III}$, $Fe^{II}$ and aoxygen-substituted radicals," J. Chem. Soc. Perkin Trans. 2, 8, 1281-1288.
113 Govindan, K., Raja, M., Noel, M. and James, E.J. (2014), "Degradation of pentachlorophenol by hydroxyl radicals and sulfate radicals using electrochemical activation of peroxomonosulfate, peroxodisulfate and hydrogen peroxide", J. Hazard. Mater., 272, 42-51.   DOI
114 Hayon, E., Treinin, A. and Wilf, J. (1972), "Electronic spectra, photochemistry and autoxidation mechanism of the sulfitebisulfite-pyrosulfite systems: The $SO_2^^-,\;SO_3^^-,\;SO_4^^-$ and $SO_5^^-$ radicals", J. Am. Chem. Soc., 94(1), 47-57.   DOI
115 Herrmann, H. (2007), "On the photolysis of simple anions and neutralmolecules as sources of $O^-$/OH, $SO_x^^-$and Cl in aqueous solution", Phys. Chem. Chem. Phys., 9(30), 3935-3964.   DOI
116 Herrmann, H., Reese, A. and Zellner, R. (1995), "Time-resolved UV/vis diode array absorption spectroscopy of $SO_x^^-$ (x=3, 4, 5) radical anions in aqueous solution", J. Mol. Struct., 348, 183-186.   DOI
117 Hinchee, R.E. and Smith, L.A. (1992) In Situ Thermal Technologies for Site Remediation, CRC press, Boca Raton, FL, U.S.A.
118 Maruthamuthu, P. and Neta, P. (1978), "Phosphate radicals: Spectra, acid-base equilibria and reactions with inorganic compounds", J. Phys. Chem., 82(6), 710-713.   DOI
119 Marsh, C., Zhang, Z. and Edwards, J.O. (1990), "The cerium(IV)-induced decomposition of peroxymonosulfate: Acid dependence and peroxydisulfate formation", Aust. J. Chem., 43(2), 321-328.   DOI
120 Maruthamuthu, P. and Neta, P. (1977), "Radiolytic chain decomposition of peroxomonophosphoric and peroxomonosulfuric acids", J. Phys. Chem., 81(10), 937-940.   DOI
121 Matzek, L.W. and Carter, K.E. (2016), "Activated persulfate for organic chemical degradation: A review", Chemosphere, 151, 178-188.   DOI
122 McElroy, W.J. and Waygood, S.J. (1990), "Kinetics of the reactions of the $SO_4^^-$ radical with $SO_4^^-$, $S_2O_8^{2-}$, H2O and $Fe^{2+}$", J. Chem. Soc. Faraday Trans., 86(14), 2557-2564.   DOI
123 McGinniss, V.D. and Kah, A.F. (1979), "Flash-photolysis of potassium peroxymonosulfate ($KHSO_5$) with generation of sulfate radical-anion and quenching by vinyl monomers", J. Coat. Technol., 51(654), 81-86.
124 McIsaac, J.E. and Edwards, J.O. (1969), "Kinetics and mechanisms of the oxidation of methanol and of ${\alpha}$-phenylethanol by peroxydisulfate ion", J. Org. Chem., 34(9), 2565-2571.   DOI
125 Meenakshisundaram, S. and Sarathi, N. (2007), "Kinetics and mechanism of oxidation of indole by $HSO_5^^-$", J. Chem. Kinet., 39(1), 46-51.   DOI
126 Zhou, Y., Jiang, J., Gao, Y., Ma, J., Pang, S.Y., Li, J., Lu, X.T. and Yuan, L.P. (2015), "Activation of peroxymonosulfate bybenzoquinone: A novel nonradical oxidation process", Environ. Sci. Technol., 49(21), 12941-12950.   DOI
127 Yu, X.Y., Bao, Z.C. and Barker, J.R. (2004), "Free radical reactions involving Cl., $Cl_2^^-$. and $SO_4^^-$. in the 248 nm photolysis of aqueous solutions containing $S_2O_8^{2-}$ and $Cl^-$", J. Phys. Chem. A, 108(2), 295-308.   DOI
128 Zhang, Z. and Edwards, J.O. (1992), "Chain lengths in the decomposition of peroxomonosulfate catalyzed by cobalt and vanadium. Rate law for catalysis by vanadium", Inorg. Chem., 31(17), 3514-3517.   DOI
129 Zhao, Q.X., Mao, Q.M., Zhou, Y.Y., Wei, J.H., Liu, X.C., Yang, J.Y., Luo, L., Zhang, J.C., Chen, H., Chen, H.B. and Tang, L. (2017), "Metal-free carbon materials-catalyzed sulfate radicalbased advanced oxidation processes: A review on heterogeneous catalysts and applications", Chemosphere, 189, 224-238.   DOI
130 Zhou, Y., Jiang, J., Gao, Y., Pang, S.Y., Yang, Y., Ma, J., Gu, J., Li, J., Wang, Z., Wang, L.H., Yuan, L.P. and Yang, Y. (2017), "Activation of peroxymonosulfate by phenols: Important role of quinone intermediates and involvement of singlet oxygen", Water Res., 125, 209-218.   DOI
131 Yang, Q., Choi, H., Al-Abed, S.R. and Dionysiou, D.D. (2009), "Iron-cobalt mixed oxide nanocatalysts: Heterogeneous peroxymonosulfate activation, cobalt leaching and ferromagnetic properties for environmental applications", Appl. Cat. B: Environ., 88(3-4), 462-469.   DOI