References

1. F. Sayilkan, M. Asiltȕrk, P. Tatar, N. Kiraz, E. Arpaç, H. Sayilkan, Preparation of re-usable photocatalytic filter for degradation of Malachite Green dye under UV and vis-irradiation, J. Hazard. Mater., 148 (2007) 735–744.
2. M.A. Behnajady, B. Vahid, N. Modirshahla, M. Shokri, Evaluation of electrical energy per order (EEO) with kinetic modelling on the removal of Malachite Green by US/UV/H₂O₂ process, Desalination, 249 (2009) 99–103.
3. C.H. Chen, C.F. Chang, S.M. Liu, Partial degradation mechanisms of malachite green and methyl violet B by Shewanella decolorationis NTOU1 under anaerobic conditions, J. Hazard. Mater., 177 (2010) 281–289.
4. X.J. Zhou, W.Q. Guo, S.S. Yang, H. S. Zheng, N.Q. Ren, Ultrasonicassisted ozone oxidation process of triphenylmethane dye degradation: evidence for the promotion effects ultrasonic on malachite green decolorization and degradation mechanism, Bioresour. Technol., 128 (2013) 827–830.
5. S. Gokulakrishnan, P. Parakh, H. Prakash, Degradation of Malachite green by Potassium persulphate, its enhancement by 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane nickel (II) perchlorate complex, and removal of antibacterial activity, J. Hazard. Mater., 213–214 (2012) 19–27.
6. Y.C. Lee, E.J. Kim, J.W. Yang, H.J. Shin, Removal of malachite green by adsorption and precipitation using aminopropyl functionalized magnesium phyllosilicate, Desalination, 192 (2011) 62–70.
7. F. Ding, X.N. Li, J.X. Diao, Y. Sun, L. Zhang, L. Ma, X.L. Yang, L. Zhang, Y. Sun, Potential toxicity and affinity of triphenylmethanedye malachite green to lysozyme, Ecotoxicol. Environ. Safety, 78 (2012) 41–49.
8. N. Bilandzic, I. Varenina, B.S. Kolanovic, D. Oraic, S. Zrncic, Malachite green residues in farmed fish in Croatia, J. Food Contr., 26 (2012) 393–396.
9. J.F. Benitez, J. Beltran-Henadian, J.L. Acero, F.J. Rubio, Contribution of free radicals to chlorophenols decomposition by several advanced oxidation process, Chemosphere, 41 (2000) 1271–1277.
10. P. Bautista, A.F. Mohedano, M.A. Gilarranz, J.A. Casas, J.J. Rodriguez, Application of Fenton oxidation to cosmetic wastewaters treatment, J. Hazard. Mater., 143 (2007) 128–134.
11. X. Fan, H. Hao, Y. Wang, F. Chen, J. Zhang, Fenton-like degradation of nalidixic acid with Fe³⁺/H₂O₂: reactions, Environ. Sci. Pollut. Res., 6 (2013) 3649–3656.
12. E. Neyens, J. Baeyens, A review of classic Fenton’s peroxidation as an advanced oxidation technique, J. Hazard. Mater., 1–3 (2003) 33–50.
13. J.K. Kim, J.H. Choi, J.H. Song, J. Yi, I.K. Song, Etherification of n-butanol to di-n-butyl ether over HnXW12O40 (X = Co²⁺, B3⁺, Si⁴⁺, and P⁵⁺) Keggin heteropolyacid catalysts, Catal. Commun., 27 (2012) 5–8.
14. R. Gao, H. Chen, Le Yingyi, W-L. Dai, K. Fan, Highly active and selective Cs_2.5H_0.5 PW12O40/SBA-15 composite material in the oxidation of cyclopentane-1,2-diol to glutaric acid by aqueous H₂O₂, Appl. Catal. A, 352 (2009) 61–65.
15. J. Wang, C. Hu, M. Jian, J. Zhang, G. Li, Catalytic oxidation performance of the α-Keggin-type vanadium-substituted heteropolymolybdates: a density functional theory study on [PV_nMo_12−nO₄₀](3+n)− (n = 0–3), Catalysis, 240 (2006) 23–30.
16. M. Ammam, I-M. Mbomekalle, B. Keita, L. Nadjo, J. Fransaer [As₈W₄₈O₁₈₄]₄₀ − a new crown-shaped heteropolyanion: electrochemistry and electrocatalytic properties towards reduction of nitrite, Electrochim. Acta, 55 (2010) 3118–3122.
17. B. Keita, E. Abdeljalil, L. Nadjo, R. Contant, R. Belghiche, Cooperativity of copper and molybdenum centers in polyoxometalate- based electrocatalysts: cyclic voltammetry, EQCM, and AFM characterization, Langmuir, 22 (2006) 10416–10425.
18. R. Belghiche, O. Bechiri, M. Abbessi, S. Golhen, Y. Le Gal, L. Ouahab, 2D and 3D polymeric Wells-Dawson polyoxometallates: synthesis, crystal structures, and cyclic voltammetry of [(M(H₂O)₄)x][H₆-2xP₂W₁₈ - nMoO₆₂] (M = CuII, CoII, NiII), Inorg. Chem., 48 (2009) 6026–6033.
19. F.F. Bamoharram, S.H. Niknezhad, J. Baharara, A. Ayati, M. Ebrahimi, M.M. Heravi. Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green, J. Nanostruct. Chem., 4 (2014) 88.
20. R. Massart, R. Contant, J.M. Fruchart, J.P. Ciabrini, M. Fournier, 31P NMR studies on molybdic and tungstic heteropolyanions. correlation between structure and chemical shift, Inorg. Chem., 16 (1977) 2916–2921.
21. R. Contant, J.P. Ciabrini, Préparation et propriétés des solutions de quelques hétéropolyanions lacunaires dérivés des 18- tungsto-2-phosphates (isomères α et β), J. Chem. Res., (1977) 2601–2609.
22. B.H. Hameed, T.W. Lee, Degradation of malachite green in aqueous solution by Fenton process, J. Hazard. Mater., 164 (2009) 468–472.
23. R. Contant, J.P. Ciabrini, Préparation et propriétés des solutions de quelques hétéropolyanions lacunaires dérivés des 18-tungsto-2-phosphates (isomères α et β ), J. Chem. Res., (1979) 2610–2618.
24. L. Li, M. Pengtao, W. Jingping, N. Jingyang, A new inorganic 2D network polyoxometalate constructed from Wkells–Dawson phosphomolybdate linked through Cu (II) ions, Inorg. Chem. Commun., 34 (2013) 23–26.
25. T. Yan, L. Li, G. Li, Y. Wang, W. Hu, X. Guan. Porous SnIn4S8 microspheres dyes degradation under visible light irradiation, J. Hazard. Mater., 186 (2011) 272–279.
26. C. Rocchiccioli– Deltcheff, R. Thouvenot, Vibrational studies of heteropolyanions related to α-P₂W₁₈O₆₂^6–, Spectrosc. Lett., 12 (1979) 127–138.
27. C. Rocchiccioli – Deltcheff, R. Thouvenot, R. Franck, Spectres i.r. et Raman d’hétéropolyaions α–XM₁₂O₄₀^n– de structure de type Keggin (X= BIII, SiIV, GeIV, PV, AsV et M= WVI et MOVI), Spectrochim. Acta Part A, 32 (1976) 587–597.
28. R. Contant, M. Abbessi, J. Canny, M. Richet, B. Keita, A. Belhouari, L. Nadjo, Synthesis, characterization and electrochemistry of complexes derived from [(1),2,3-P₂Mo₂W₁₅O₆₁]₁₀ – and first transition metal ions, Eur. J. Inorg. Chem., (2000) 567–574.
29. R. Belghiche, R. Contant, Y. Wei Lu, B. Keita, M. Abbessi, L. Nadjo, J. Mahuteau, Synthesis and characterization of Fe- or Cu-substituted molybdenum enriched tungstodiphosphates, Eur. J. Inorg. Chem., (2002) 1410–1414.
30. L. Szpyrkowicz, C. Juzzolino, S.N. Kaul, A comparative study on oxidation of disperse dyes by electrochemical process, ozone, hypochlorite and Fenton reagent, Water Res., 35 (2001) 2129–2136.
31. N.M. Mahmoodi, M. Arami, N.Y. Limaee, Photocatalytic degradation of triazinic ring containing azo dye (Reactive Red 198) by using immobilized TiO₂ photoreactor: bench scale study, J. Hazard. Mater., 133 (2006) 113–118.
32. C. Bai, W. Xiao, D. Feng, M. Xian, D. Guo, Z. Ge, Y. Zhou, Efficient decolorization of Malachite green in the Fenton reaction catalyzed by [Fe(III)-salen]Cl complex, Chem. Eng. J., 215– 216 (2013) 227–234.
33. D.H. Williams, I. Fleming, Spectroscopic Methods in Organic Chemistry, 4th edn., McGraw-Hill, London 2006.
34. S. Kumar, G. Nanak, Organic Chemistry, Spectroscopy of Organic Compounds, Available online at: http://www.uobabylon.edu.iq/eprints/publication_11_8282_250.pdf, 2006, (Accessed on 05 June, 2014).
35. S.H. Tiana, Y.T. Tu, D.S. Chen, X. Chen, Y. Xiong, Degradation of acid Orange II at neutral pH using Fe₂(MoO₄)₃ as a heterogeous Fenton-like catalyst, J. Chem. Eng., 169 (2011) 31–37.
36. M. Moudjahed, L. Dermeche, S. Benadji, T. Mazari, C. Rabia, Dawson-type polyoxometalates as green catalysts for adipic acid synthesis, J. Mol. Catal. A, 414 (2016) 72–77.