Electro-Fenton degradation of cellulose using graphite/PTFE electrodes modified by 2-ethylanthraquinone

Wang, Zhongxu; Li, Gang; Yang, Fang; Chen, Yu-Lu; Gao, Peng

doi:10.1016/j.carbpol.2011.07.021

Cited by 40 publications

(13 citation statements)

References 26 publications

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“…The resulting aldehyde and keto groups from the oxidation reactions of the hydroxyl groups on C 2 , C 3 , and C 6 may initiate further degradation reactions, such as dehydration and cleavage of the glycosidic linkages (reaction 3 in Figure ). − The breakage of the 1,4-β- d -glucoside bonds in the cellulose chain leads to a DP decease of the cellulose macromolecules, which weakens the microfibril network structure to facilitate nanofibrillation in the subsequent homogenization process. Indeed, the DP of the SWBK fibers decreased from about 800 to about 200 in 30 min in the modified Fenton process (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Modified Fenton Oxidation of Cellulose Fibers for Cellulose Nanofibrils Preparation

Qun

Wang

Long

et al. 2018

ACS Sustainable Chem. Eng.

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A novel catalytic oxidation process based on the Fenton reaction (H2O2–FeSO4) was developed to pretreat cellulose fibers for the preparation of cellulose nanofibrils (CNF). In the so-called modified Fenton process, softwood bleached kraft pulp (SWBK) fibers were utilized as individual microreactors to carry out efficient in situ oxidation of cellulose chains, which in turn facilitated nanofibrillation of fibers in subsequent mechanical treatment. Ferrous ions were preloaded into the fiber cell wall by adsorption and diffusion, which initiated the catalytic oxidation of cellulose simultaneously inside the fiber cell wall structure when hydrogen peroxide was introduced. The C2, C3, and C6-hydroxyl groups on the glucosyl of cellulose chains were oxidized to carboxyl groups, which could enhance the separation of micro/nanofibrils by increasing the electrostatic repulsion of the fibrils. The carboxyl group content was found to increase from 39 to 56 mmol/kg after the oxidation pretreatment. The oxidation also caused breakage of the 1,4-β-d-glucoside bonds of cellulose chains and dramatically decreased the degree of polymerization (DP) of the cellulose macromolecules. The oxidized SWBK fibers were well dispersed into cellulose nanofibrils in the subsequent homogenization treatment. The obtained CNF had a uniform distribution of cellulose fibrils with an average diameter of less than 100 nm.

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Section: Resultsmentioning

confidence: 99%

Modified Fenton Oxidation of Cellulose Fibers for Cellulose Nanofibrils Preparation

Qun

Wang

Long

et al. 2018

ACS Sustainable Chem. Eng.

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“…The reaction mechanisms is not fully elucidated, but are suggested to involve the formation of various radicals like alkyl and carbon radicals produced by hydrogen abstraction. The hydroxyl groups in cellulose and hemicelluloses are susceptible to direct oxidation of the C2, C3 and C6 hydroxyl groups, the resulting aldehyde or keto group may initiate further degradation reactions such as dehydration and cleavage of the glycosidic linkages (Wang et al 2011;Henniges et al 2012;Jeong et al 2014;Lai 2001). Figure 1 shows the positions in the cellulose chain that may be subjected to oxidation.…”

Section: Introductionmentioning

confidence: 99%

The effect of Fenton chemistry on the properties of microfibrillated cellulose

et al. 2014

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A fully bleached birch kraft pulp was treated with acidic hydrogen peroxide in the presence of ferrous ions (Fenton's reagent) and thereafter treated mechanically in a colloid mill to produce a product containing microfibrillated cellulose (MFC). The produced MFC products were chemically and morphologically characterized and compared with MFC products produced without pretreatment as well as with enzymatic hydrolysis. Fenton treatment resulted in an increase in total charge and number of carbonyl groups while the intrinsic viscosity decreased. The Fenton treated pulps were easier to process mechanically i.e. they reached a higher specific surface area at a given mechanical treatment time and the MFC produced had a stable water-fibre suspension for at least 8 weeks compared to enzymatic pretreated pulps and pulps not subjected to any pretreatment.

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“…carbon felt, graphite felt, PTFE-gas diffusion electrode (GDE)) manifested excellent performance in electro-Fenton process, but still the yield of H2O2 production and the rates of Fe 2+ regeneration were not satisfying enough to scale-up the technology. 13,14 Therefore, extensive efforts have been made to elevate the catalytic efficiency of carbonaceous cathodes via chemical modification 60 , electrochemical modification 66 , acidic treatment 83 or surface modification with organic compounds and rareearth-derived compounds [84][85][86][87][88] . More recently, the benefits that could be gained from graphenebased materials due to their exceptional properties (section 1.5) have been investigated for EAOPs applications.…”

Section: Context and Development Of Eaopsmentioning

confidence: 99%

Graphene-Based Nanostructured Materials for Advanced Electrochemical Water/Wastewater Treatment

Mousset¹,

Zhou²

2018

Polymeric and Nanostructured Materials

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The emerging development of graphene-based electrodes is critically reviewed. These promising materials have shown to enhance the electrochemical advanced oxidation processes (EAOPs) efficiency during wastewater treatment. Through thorough investigations, the main factors responsible of the success of such cathode in undivided electrolytic cell have been identified as follow: (i) carbonaceous raw material, (ii) nanostructured-coated materials, (iii) high-porosity materials, (iv) nitrogen-doped materials. These parameters participate to the enhancement of electroactive surface area and conductivity of electrode, two main material's properties that affect its efficiency. By combining all these characteristics, graphene-based electrode opens up new exciting EAOPs setups and should bring them closer to real applications.

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Electro-Fenton degradation of cellulose using graphite/PTFE electrodes modified by 2-ethylanthraquinone

Cited by 40 publications

References 26 publications

Modified Fenton Oxidation of Cellulose Fibers for Cellulose Nanofibrils Preparation

Modified Fenton Oxidation of Cellulose Fibers for Cellulose Nanofibrils Preparation

The effect of Fenton chemistry on the properties of microfibrillated cellulose

Graphene-Based Nanostructured Materials for Advanced Electrochemical Water/Wastewater Treatment

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