Effect of metal ions on decomposition of chlorinated organic substances by ozonation in acetic acid

Catalytic ozonation of Orange-G through highly interactive contributions of hematite and SBA-16 – To better understand azo-dye oxidation in nature

“…No OG was detected after a 4 min ozonation with 2 g.L À1 of 1:1 HS or 3 min ozonation with 1 g.L À1 . This beneficial effect of low catalyst concentration in correlation with acidic pH (1.8) was already reported for clay catalysts (Shahidi et al, 2015a(Shahidi et al, , 2015b(Shahidi et al, , 2014Lanzl et al, 2012;Sulpizi et al, 2012;Araujo et al, 2011;Azzouz et al, 2010;Xu and Li, 2010;Deng et al, 2008;Xu and Gao, 2008;Kim et al, 2005;Okawa et al, 2005;Bodo et al, 2004). Here, a combination of hematite dissolution with silanol protonation must be involved.…”

“…In spite of its lower catalytic activity as compared to Fe 2þ cation, Fe 3þ is supposed to generate Fe 3þ -alkylate complexes with high reactivity towards ozone under acidic conditions (Okawa et al, 2005).…”

A Facile Hydrothermal Method to Synthesize Nanosized Co3O4/CeO2 and Study of its Catalytic Characteristic in Catalytic Ozonation of Phenol

“…As we know these metal ions would lead to a secondary pollution in water. Heterogeneous catalytic ozonation also has been studied a lot, catalysts proposed in this process are metal oxides, metals or metal oxides on supports (metal oxides, activated carbon and zeolite) [3][4][5][6][7][8][9][10][11], and several studies have been performed to present the mechanism of heterogeneous catalytic ozonation [11][12][13][14], Andreozzi et al [12] have studied the mechanism of decomposition of oxalic acid with manganese dioxide ozonation, and have revealed that the catalytic effect should be mainly attributed to ozone adsorption and a series of reactions on catalyst surface. Beltrán et al [13] concluded that surface reactions between ozone and hydrogen peroxide on the activated carbon, which generated free radicals, played an important role on organic compound removal.…”

Catalytic ozonation of phenol in water with natural brucite and magnesia

“…As another advanced oxidation process, catalytic ozonation could also achieve the same effects on phenols degradation. According to literatures, many catalysts have been used in catalytic ozonation, such as translation metal oxides [15,18,19], metals ions [20,21]. Assalin et al [18] have studied the degradation of phenol in catalytic ozonation with Mn(II) and Cu(II), and he concluded that these two ions could apparently accelerate the phenol degradation rate.…”