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Abstract: The degradation of microcystin-LR (MC-LR) in water by hydrogen peroxide assisted ultraviolet (UV/H₂O₂) process was investigated in this paper. The UV/H₂O₂ process appeared to be effective in removal of the MC-LR. MC-LR decomposition was primarily ascribed to production of strong and nonselective oxidant-hydroxyl radicals within the system. The intensity of UV radiation, initial concentration of MC-LR, MC-LR purity, dosages of H₂O₂, the initial solution pH, and anions present in water, to some extent, influenced the degradation rate of MC-LR. A modified pseudo-first-order kinetic model was developed to predict the removal efficiency under different experimental conditions.

[1] Aleboyeh, A., Moussa, Y., Aleboyeh, H., 2005. The effect of operational parameters on UV/H₂O₂ decolourisation of Acid Blue 74. Dyes and Pigments, 66(2):129-134.

[2] Amorim, A., Vasconcelos, V., 1999. Dynamics of Microcystins in the mussel Mytilus galloprovincialis. Toxicon, 37(7):1041-1052.

[3] Beltran, F.J., Ovejero, G., Rivas, J., 1996. Oxidation of polynuclear aromatic hydrocarbons in water. 3. UV radiation combined with hydrogen peroxide. Industrial & Engineering Chemistry Research, 35(3):883-890.

[4] Benitez, F.J., Beltranheredia, J., Acero, J.L., Gonzalez, T., 1996. Degradation of protocatechuic acid by two advanced oxidation processes: Ozone/UV radiation and H₂O₂/UV radiation. Water Research, 30(7):1597-1604.

[5] Brooke, S., Newcombe, G., Nicholson, B., Klass, G., 2006. Decrease in toxicity of Microcystins LA and LR in drinking water by ozonation. Toxicon, 48(8):1054-1059.

[6] Chu, W., 2001. Modeling the quantum yields of herbicide 2,4-D decay in UV/H₂O₂ process. Chemosphere, 44(5):935-941.

[7] Codd, G.A., 2000. Cyanobacterial toxins, the perception of water quality, and the prioritisation of eutrophication control. Ecological Engineering, 16(1):51-60.

[8] Colonna, G.M., Caronna, T., Marcandalli, B., 1999. Oxidative degradation of dyes by ultraviolet radiation in the presence of hydrogen peroxide. Dyes and Pigments, 41(3):211-220.

[9] Cousins, I.T., Bealing, D.J., James, H.A., Sutton, A., 1996. Biodegradation of Microcystin-LR by indigenous mixed bacterial populations. Water Research, 30(2):481-485.

[10] Dawson, R.M., 1998. The toxicology of Microcystins. Toxicon, 36(7):953-962.

[11] de Maagd, P., Hendriks, A.J., Seinen, W., Sijm, D., 1999. pH-dependent hydrophobicity of the cyanobacteria toxin Microcystin-LR. Water Research, 33(3):677-680.

[12] Gajdek, P., Lechowski, Z., Bochnia, T., Kepczynski, M., 2001. Decomposition of Microcystin-LR by Fenton oxidation. Toxicon, 39(10):1575-1578.

[13] Hoeger, S.J., Dietrich, D.R., Hitzfeld, B.C., 2002. Effect of ozonation on the removal of cyanobacterial toxins during drinking water treatment. Environmental Health Perspectives, 110(11):1127-1132.

[14] Ito, E., Takai, A., Kondo, F., Masui, H., Imanishi, S., Harada, K., 2002. Comparison of protein phosphatase inhibitory activity and apparent toxicity of Microcystins and related compounds. Toxicon, 40(7):1017-1025.

[15] Kurbus, T., le Marechal, A.M., Voncina, D.B., 2003. Comparison of H₂O₂/UV, H₂O₂/O₃ and H₂O₂/Fe²⁺ processes for the decolorisation of vinylsulphone reactive dyes. Dyes and Pigments, 58(3):245-252.

[16] Kurki-Helasmo, K., Meriluoto, J., 1998. Microcystin uptake inhibits growth and protein phosphatase activity in mustard (Sinapis alba L.) seedlings. Toxicon, 36(12):1921-1926.

[17] Lawton, L.A., Robertson, P., 1999. Physico-chemical treatment methods for the removal of Microcystins (cyanobacterial hepatotoxins) from potable waters. Chemical Society Reviews, 28(4):217-224.

[18] Lawton, L.A., Robertson, P., Cornish, B., Marr, I.L., Jaspars, M., 2003. Processes influencing surface interaction and photocatalytic destruction of Microcystins on titanium dioxide photocatalysts. Journal of Catalysis, 213(1):109-113.

[19] Liao, C.H., Gurol, M.D., 1995. Chemical oxidation by photolytic decomposition of hydrogen-peroxide. Environmental Science & Technology, 29(12):3007-3014.

[20] Liu, I., Lawton, L.A., Cornish, B., Robertson, P., 2002. Mechanistic and toxicity studies of the photocatalytic oxidation of Microcystin-LR. Journal of Photochemistry and Photobiology A: Chemistry, 148(1-3):349-354.

[21] Lopez, A., Bozzi, A., Mascolo, G., Kiwi, J., 2003. Kinetic investigation on UV and UV/H₂O₂ degradations of pharmaceutical intermediates in aqueous solution. Journal of Photochemistry and Photobiology A: Chemistry, 156(1-3):121-126.

[22] Muruganandham, M., Swaminathan, M., 2004. Photochemical oxidation of reactive azo dye with UV-H₂O₂ process. Dyes and Pigments, 62(3):269-275.

[23] Ozawa, K., Yokoyama, A., Ishikawa, K., Kumagai, M., Watanabe, M.F., Park, H.D., 2003. Accumulation and depuration of Microcystin produced by the cyanobacterium Microcystis in a freshwater snail. Limnology, 4(3):131-138.

[24] Qian, S.S., Donnelly, M., Schmelling, D.C., Messner, M., Linden, K.G., Cotton, C., 2004. Ultraviolet light inactivation of protozoa in drinking water: a Bayesian meta-analysis. Water Research, 38(2):317-326.

[25] Qiao, R.P., Li, N., Qi, X.H., Wang, Q.S., Zhuang, Y.Y., 2005. Degradation of Microcystin-RR by UV radiation in the presence of hydrogen peroxide. Toxicon, 45(6):745-752.

[26] Robertson, P., Lawton, L.A., Cornish, B., 1999. The involvement of phycocyanin pigment in the photodecomposition of the cyanobacterial toxin, Microcystin-LR. Journal of Porphyrins and Phthalocyanines, 3(67):544-551.

[27] Rositano, J., Nicholson, B.C., Pieronne, P., 1998. Destruction of cyanobacterial toxins by ozone. Ozone Science & Engineering, 20(3):223-238.

[28] Shu, H.Y., Chang, M.C., Fan, H.J., 2004. Decolorization of azo dye acid black 1 by the UV/H₂O₂ process and optimization of operating parameters. Journal of Hazardous Materials, 113(1-3):203-210.

[29] Sorensen, M., Frimmel, F.H., 1997. Photochemical degradation of hydrophilic xenobiotics in the UV/H₂O₂ process: Influence of nitrate on the degradation rate of EDTA, 2-amino-1-naphthalenesulfonate, diphenyl-4-sulfonate and 4,4’-diaminostilbene-2,2’-disulfonate. Water Research, 31(11):2885-2891.