Acid Hydrogen Peroxide Treatment of Norway Spruce TMP: A Model Study Using Free Ferrous Ions and Ferric Ions Chelated with EDTA as Catalysts

Modified Fenton Oxidation of Cellulose Fibers for Cellulose Nanofibrils Preparation

“…The main reason that Fenton reagents possess the ability of catalytic degradation for many organic compounds is due to the presence of HO• and HOO• with higher oxidation potentials. 34,35 Hydroxyl radicals (HO•) and hydroperoxyl radicals (HOO•) are generated from hydrogen peroxide with the catalysis of ferrous ions. As a strong oxidative agent (E 0 = 2.8 V), 38,39 HO• can cause the degradation of polysaccharides, 40 and leads to the decrease of molecular weight (M w ) as well as formation of a carboxyl group.…”

“…As a strong oxidative agent (E 0 = 2.8 V), 38,39 HO• can cause the degradation of polysaccharides, 40 and leads to the decrease of molecular weight (M w ) as well as formation of a carboxyl group. 31,35,41 The Fenton reaction has been applied commercially in the oxidation treatment of organics in homogeneous systems because of its eco-friendly nature and low capital investment requirement. 34−37 The conventional Fenton process is effective in degrading dissolved or colloidal organic substances in wastewater when the pH of the system is in the acidic range.…”

“…During Fenton oxidation, various radicals, including HO• and HOO•, would be generated, and Fe 2+ and Fe 3+ could be converted to one another. The main reason that Fenton reagents possess the ability of catalytic degradation for many organic compounds is due to the presence of HO• and HOO• with higher oxidation potentials. , …”

“…Hydroxyl radicals (HO•) and hydroperoxyl radicals (HOO•) are generated from hydrogen peroxide with the catalysis of ferrous ions. As a strong oxidative agent ( E 0 = 2.8 V), , HO• can cause the degradation of polysaccharides, and leads to the decrease of molecular weight ( M w ) as well as formation of a carboxyl group. ,, The Fenton reaction has been applied commercially in the oxidation treatment of organics in homogeneous systems because of its eco-friendly nature and low capital investment requirement. − The conventional Fenton process is effective in degrading dissolved or colloidal organic substances in wastewater when the pH of the system is in the acidic range. , However, the conventional Fenton process is less efficient in heterogeneous systems (e.g., cellulose fibers) due to the fact that hydroxyl and hydroperoxyl radicals are instable and they are consumed wastefully by the hydrogen peroxide decomposition reaction before they reach the reaction sites of fibers. Figure S3 shows the morphology of the SWBK fibers pretreated by the conventional Fenton oxidation followed by homogenization treatment under the same conditions.…”

The effect of Fenton chemistry on the properties of microfibrillated cellulose

“…as an active intermediate (Sychev and Isak 1995). The presence of hydroxyl radicals in the reaction between acidic hydrogen peroxide and ferrous ions in a cellulosic substrate has been demonstrated by Walter et al (2013). Organic compounds like lignocellulosic materials, oxidized in radical chain reactions, encompass a series of complex reactions including numerous radical intermediates and consecutive reactions.…”