Manganese Compounds as Versatile Catalysts for the Oxidative Degradation of Organic Dyes

Recycled carbon (RC) materials made functional: An efficient heterogeneous Mn-RC catalyst

“…In this context, new, efficient, selective, low-cost and easy to prepare Mn-catalysts remain at high demand in the field of oxidation catalysis [8]. So far, catalytic degradation of organic dyes by non-heme Mn II -HCO 3 − catalysts has been reported under mild reaction conditions, e.g., using H 2 O 2 as oxidant [11][12][13][14][15][16]. Rothbart et al investigated the oxidative degradation of Orange II by Mn II -HCO 3 − and peracetic acid [13,14].…”

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

“…In many cases, a detailed understanding of the intimate reaction mechanism and the nature of the active sites are critical for the design of biomimetic catalysts with predictable reactivity. Mechanistic studies on model metal-assisted H2O2 activation systems for the formation of a more aggressive oxidant, which can be applied to biological, medical, environmental or industrial processes, are mostly focused on iron and manganese complexes [19,20,26,27]. In the following sections of this review, we discuss metal-assisted thermal activation processes of H2O2 in the context of their significant biomedical and environmental role.…”

“…Also, chlorine bleaching of cellulose pulp leaves effluents loaded with chlorophenols, chloro-aliphatics and polychlorinated dioxins and furans [18]. In many cases, simple transition metal salts and complexes can be used as catalysts for this purpose and have resulted in many efficient applications [19]. In some cases, biological enzymatic systems have indicated the way to proceed in the development of efficient catalysts for the activation of peroxides.…”

Redox‐State Dependent Ligand Exchange in Manganese‐Based Oxidation Catalysis

“…The relatively low reactivity of H 2 O 2 requires, however, the use of either high temperatures and basic conditions or the use of catalysts, including those based on manganese. [185,186] Eldik and co-workers [187] have studied the ability of manganese catalysts to activate H 2 O 2 to oxidise various azo and phenolic dyes in carbonate buffers (Scheme 11).…”

“…Conditions used in catalytic dye oxidation with manganese catalysts by Eldik and co-workers. [187] The dyes examined generally showed nǞπ* absorptions between 375-490 nm, depending on the substituents present, the pK a values of the dyes and pH.…”