Photocatalytic degradation of lignin using Pt/TiO2 as the catalyst

Ma, Ying-Shih; Chang, Cheng-Nan; Chiang, Yen-Pei; Sung, Hsiao-Fan; Chao, Allen C.

doi:10.1016/j.chemosphere.2007.10.061

Cited by 94 publications

(58 citation statements)

References 22 publications

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“…Lignin degradation ratio by sono-catalytic-Fenton reaction was 60.0% at 180 min. Ma et al [32] studied photo-catalytic degradation of lignin with the use of catalysts TiO 2 and Pt/TiO 2 . The results showed that application of UV irradiation alone has almost no effect on the reduction of dissolved organic carbon (DOC).…”

Section: Statistical Analysis Of L 9 Taguchi Experimental Designmentioning

confidence: 99%

Environmental assessment of residues generated after consecutive acid-base pretreatment of sugarcane bagasse by advanced oxidative process

Oliveira

Chandel

Silva

et al. 2013

sustain chem process

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Background: Biofuels produced from sugarcane bagasse (SB) have shown promising results as a suitable alternative of gasoline. Biofuels provide unique, strategic, environmental and socio-economic benefits. However, production of biofuels from SB has negative impact on environment due to the use of harsh chemicals during pretreatment. Consecutive sulfuric acid-sodium hydroxide pretreatment of SB is an effective process which eventually ameliorates the accessibility of cellulase towards cellulose for the sugars production. Alkaline hydrolysate of SB is black liquor containing high amount of dissolved lignin.

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Section: Statistical Analysis Of L 9 Taguchi Experimental Designmentioning

confidence: 99%

Environmental assessment of residues generated after consecutive acid-base pretreatment of sugarcane bagasse by advanced oxidative process

Oliveira

Chandel

Silva

et al. 2013

sustain chem process

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“…The set-up of thermally-assisted photocatalytic experiments under infrared lamp irradiation; emission spectrum of infrared lamp; thermally-assisted photodegradation curves of methyl orange catalyzed by TiO 2 …”

Section: Supplementary Informationmentioning

confidence: 99%

“…It is one of the major components of wastewater from pulp and paper mills, causing the dark brown coloration and environmental pollution of pulp and paper effluents [1]. Lignin is generally difficult to be effectively removed in conventional treatment processes because of its high resistance to microbial degradation [2,3]. A combination of conventional biological treatment with advanced oxidation processes (AOPs) to remove the bio-recalcitrant lignin derivatives has become a promising strategy in the treatment of pulp and paper mill effluents [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of H 2 O 2 or O 2 in photocatalytic processes generally further improves the photocatalytic performance of TiO 2 or ZnO by either trapping photogenerated electrons to suppress the recombination of photogenerated electrons and holes or by accepting electrons to produce additional hydroxyl radicals [10,11]. Because semiconductors can only be excited by light with energy greater than their band gaps, UV light has to be used as the excitation source for TiO 2 and ZnO with band gaps wider than 3.0 eV.…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, the photochemical processes, especially heterogeneous photocatalytic process involving semiconductors and ultraviolet (UV) irradiation, such as TiO 2 /UV, Fe 2 O 3 -TiO 2 /UV, ZnO/UV, ZnO/O 2 /UV and TiO 2 /H 2 O 2 /UV, have attracted significant attention in the degradation of lignin [7][8][9][10]. Wide band gap semiconductors, such as TiO 2 and ZnO, are employed due to their high valence band potentials. TiO 2 and ZnO generally photogenerate holes with potentials higher than the redox potential of H 2 O/·OH, favoring the production of hydroxyl radicals.…”

Section: Introductionmentioning

confidence: 99%

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Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

Liu

2017

Sci. China Mater.

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As a bio-recalcitrant organic pollutant in paper mill effluent, lignin is generally removed by an advanced oxidation process, such as a TiO 2 /H 2 O 2 photocatalytic technique under irradiation with ultraviolet light, which only accounts for less than 5% of sunlight. Herein, we reported a TiO 2 /H 2 O 2 -based thermally-assisted photocatalytic process that allows lignin to be efficiently degraded under visible/ near-infrared light at an elevated temperature. Adsorption of H 2 O 2 on TiO 2 nanoparticles and an increase of temperature facilitate the production and separation of charge carriers under near-infrared and visible light irradiation, accelerate carrier transfer at the TiO 2 -electrolyte interface and promote the production of hydroxyl radicals. A higher level of H 2 O 2 addition results in an increased degradation rate of lignin, while the optimal temperature for the thermally-assisted photodegradation of lignin is 70°C. A charge carrier excitation and transfer process was proposed for the TiO 2 /H 2 O 2 thermally-assisted photocatalytic process. This work describes a new method for the photodegradation of organic pollutants, such as residual lignin in paper mill effluent, using wide band gap semiconductors under visible and near-infrared light irradiation.

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