Mild Photocatalysed and Catalysed Green Oxidation of Lignin: A Useful Pathway to Low-Molecular-Weight Derivatives

Tonucci, Lucia; Coccia, Francesca; Bressan, M.; d’Alessandro, Nicola

doi:10.1007/s12649-011-9102-6

Cited by 35 publications

(28 citation statements)

References 37 publications

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“…Absorption peaks were observed at 203 and 280 nm, while a shoulder at around 230 nm was observed. Lignin absorbs UV light with high molar extinction coefficients because of the several methoxylated phenylpropane units of which they are composed of [29]. The absorption peaks decrease gradually, indicating the decomposition of lignin sulfonate and hence deterioration of the chromophor groups present.…”

Section: Experimental 21 Photocatalytic Experimentsmentioning

confidence: 99%

“…The absorption peaks decrease gradually, indicating the decomposition of lignin sulfonate and hence deterioration of the chromophor groups present. Peaks around 203 nm correspond to portions of unsaturated chains [29,30], while those around 280 nm correspond to unconjugated phenolic hydroxyl groups [31] and aromatic rings [30] of lignin sulfonate [2]. Ohnishi et al [30] report the absorption tailing arising from the color of lignin.…”

Section: Experimental 21 Photocatalytic Experimentsmentioning

confidence: 99%

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Degradation of Lignin Derivatives by Photocatalysts

Lekelefac¹,

Czermak²

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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Photocatalytic degradation experiments were done with lignin sulfonate in a circulating reactor. Catalysts (TiO 2-P25-SiO 2 + Pt, TiO 2-P25-SiO 2, TiOSO 4 _30.6 wt%, ZnO + TiO 2-P25-SiO 2), synthesized via the sol-gel method, were immobilized on porous glass support material. A comparative study was done regarding morphology of coatings, degradation rates, reaction rates, dissolved carbon (DC), formation of peaks, and fluorescence of products formed from the photocatalytic degradation of lignin sulfonate obtained from a local paper plant. Through simultaneous reaction-extraction pathways applying dialysis filtration and highly porous polystyrene divinylbenzene adsorbent resin (HR-P) for solid-phase extraction (SPE), an attempt was been made to isolate smaller molecules produced from photocatalytic degradation. Moreover, relatively high lignin sulfonate (0.5 g/L) concentrations are used in the reactions. UV-Vis spectroscopy revealed a faster reduction in the concentration values for the aliphatic moiety compared to the aromatic moiety. Peaks were observed by both fluorescence spectroscopy and high-performance liquid chromotography (HPLC), suggesting the production of new substances and fluorophores.

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Section: Experimental 21 Photocatalytic Experimentsmentioning

confidence: 99%

Section: Experimental 21 Photocatalytic Experimentsmentioning

confidence: 99%

Degradation of Lignin Derivatives by Photocatalysts

Lekelefac¹,

Czermak²

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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“…One is photocatalytic degradation of lignin to remove contaminants in wastewater of paper mill. 28,29 Another is to obtain aromatic compounds by photocatalytic depolymerization of lignin. 30 However, few of them referred to the dearomatization reaction of benzene ring in lignin to generate alkyl alcohols and alkyl acids by using photocatalytic method, which facilitates the transformation of lignin into liquid fuels and high-value chemicals.…”

Section: Introductionmentioning

confidence: 99%

A green approach for the synthesis of novel Ag₃PO₄/SnO₂/porcine bone and its exploitation as a catalyst in the photodegradation of lignosulfonate into alkyl acids

et al. 2018

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A novel Ag 3 PO 4 /SnO 2 /porcine bone composite photocatalyst was successfully prepared via an ion exchange method, which can convert lignin derivatives into small molecular acids upon exposure to visible light at room temperature at ambient pressure. The composition characterization, optical absorption properties and photocatalytic activities of the Ag 3 PO 4 /SnO 2 /porcine bone composites were thoroughly investigated. The certain role of each component of the composites in the degradation reaction was discussed: Ag 3 PO 4 acted as the major active component, while SnO 2 and porcine bone as cocatalyst contributed to improve the photocatalytic activity and stability of Ag 3 PO 4 . The enhanced activity of the Ag 3 PO 4 /SnO 2 /porcine bone composite may be attributed to the synergistic effect including the matched energy band structures of Ag 3 PO 4 and SnO 2 for the decrease in the probability of electron-hole recombination and improved performance in the presence of hierarchical porous porcine bone (hydroxyapatite). This paper also analyzed the change of the molecular weight and structure of sodium lignin sulfonate in the photocatalytic reaction and discussed the possible photocatalytic mechanism of the photocatalyst composite, indicating that the benzene rings of guaiacol were oxidized into different alkyl acids (maleic acid, oxalic acid, formic acid and methoxy acetic acid).

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“…In a cellulosic ethanol plant lignin-rich biomass residues are generated as a byproduct from ethanol production and usually burned to generate heat and electricity [1,2]. To increase the values of this byproduct and profitability of cellulosic ethanol production, research efforts have been made to convert lignin into value-added chemicals, fuels, and lignin-based biopolymers (e.g., composites, additives) [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Biorefinery Lignin to Renewable Chemicals via Sequential Fractionation and Depolymerization

Liang

Chen

2016

Waste Biomass Valor

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Switchgrass-based, lignin-rich residues from cellulosic ethanol production were valorized into green chemicals via sequential methanol fractionation and hydrogenolysis depolymerization. The biomass residues were relatively purified by removing some structural carbohydrates and water soluble compounds. Methanol fractionation solubilized 14 % lignin from the above purified biomass residue, of which 95 % was klason lignin. The subsequent hydrogenolysis was catalyzed by Raney nickel with formic acid as hydrogen donors. Methanol soluble lignin fraction gave 58.11 % bio-oil yield, which was more than five times that from other fractions. The oxidation using hydrogen peroxide altered functional groups in lignin fractions but did not enhance the bio-oil yields. The GC-MS results revealed that bio-oil from all fractions except methanol soluble fraction contained more guaiacyl derivatives than syringyl derivatives. Sugar derivatives were generated at significant amounts from the depolymerization of the fractions that contained structural carbohydrates. Most of the generated monomers are renewable chemicals with wide industrial applications.

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Mild Photocatalysed and Catalysed Green Oxidation of Lignin: A Useful Pathway to Low-Molecular-Weight Derivatives

Cited by 35 publications

References 37 publications

Degradation of Lignin Derivatives by Photocatalysts

Degradation of Lignin Derivatives by Photocatalysts

A green approach for the synthesis of novel Ag₃PO₄/SnO₂/porcine bone and its exploitation as a catalyst in the photodegradation of lignosulfonate into alkyl acids

Biorefinery Lignin to Renewable Chemicals via Sequential Fractionation and Depolymerization

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Mild Photocatalysed and Catalysed Green Oxidation of Lignin: A Useful Pathway to Low-Molecular-Weight Derivatives

Cited by 35 publications

References 37 publications

Degradation of Lignin Derivatives by Photocatalysts

Degradation of Lignin Derivatives by Photocatalysts

A green approach for the synthesis of novel Ag3PO4/SnO2/porcine bone and its exploitation as a catalyst in the photodegradation of lignosulfonate into alkyl acids

Biorefinery Lignin to Renewable Chemicals via Sequential Fractionation and Depolymerization

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A green approach for the synthesis of novel Ag₃PO₄/SnO₂/porcine bone and its exploitation as a catalyst in the photodegradation of lignosulfonate into alkyl acids