Tracing TiO2 photocatalytic degradation of humic acid in the presence of clay particles by excitation–emission matrix (EEM) fluorescence spectra

Kavurmaci, Sibel Şen; Bekbölet, Miray

doi:10.1016/j.jphotochem.2014.03.011

Cited by 45 publications

(12 citation statements)

References 27 publications

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“…Besides the aforementioned fulvic-like (Region III) and humic-like fluorophores (Region V), Region I (tyrosine-like) and Region II (tryptophan-like) signified the fluorophores arising from aromatic proteins either free or as protein constituents. Region IV represented fluorophores attributed to the components of the dissolved organic carbon derived from microbial byproducts [13]. When the regional speciation profile was assessed, it could be easily said that both humic-like and fulvic-like fluorophores were prominent for all of the molecular size fractions of HA following adsorption onto all TiO 2 specimens (Table1).…”

Section: Resultsmentioning

confidence: 99%

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Spectrofluorometric Characterization of Adsorption of Different Molecular Size Fractions of Humic Acid onto Anion-Doped TiO2 Specimens

2016

International Conference on Agricultural, Civil and Environmental Engineering (ACEE-16) April 18-19, 2016 Istanbul, Turkey

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In this study, excitation-emission matrix (EEM) fluorescence spectral features were evaluated for the elucidation of surface interactions among diverse molecular size fractions of humic acid (0.45 µm filtered fraction, 100 kDa fraction and 30 kDa fraction) and bare as well as anion-doped TiO 2 specimens (Evonik P-25 and Hombikat UV-100). EEM constitute fluorescence spectra at many different excitation wavelengths providing a general point of view related to all features of organic matter within a particular spectral range. The objective of the present research was to compare the similarities and differences of the origin of different molecular size fractions of humic acid in the presence of bare and anion doped TiO 2 (Evonik P-25 and Hombikat UV-100) specimens by excitation-emission matrix (EEM) fluorescence spectral properties.

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Section: Resultsmentioning

confidence: 99%

“…0.0831 DOC 1.37     According to the above presented linear equations, the use of the fluorescence methods could present remarkable information about the removal of the specified UV-vis parameters and dissolved organic carbon content [13].…”

Section: Fimentioning

confidence: 99%

Spectrofluorometric Characterization of Adsorption of Different Molecular Size Fractions of Humic Acid onto Anion-Doped TiO2 Specimens

2016

International Conference on Agricultural, Civil and Environmental Engineering (ACEE-16) April 18-19, 2016 Istanbul, Turkey

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“…The feasibility of PEC technology used in the degradation of FA is proved in the limited previous researches [ 8 , 9 ]. However, the reported method of FA degradation is inefficient and time-consuming, or the preparation of the catalytic material is very complex.…”

Section: Introductionmentioning

confidence: 99%

The Promotion Effect of Low-Molecular Hydroxyl Compounds on the Nano-Photoelectrocatalytic Degradation of Fulvic Acid and Mechanism

Dong

et al. 2016

Nano-Micro Lett.

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A significant promotion effect of low-molecular hydroxyl compounds (LMHCs) was found in the nano-photoelectrocatalytic (NPEC) degradation of fulvic acid (FA), which is a typical kind of humic acid existing widely in natural water bodies, and its influence mechanism was proposed. A TiO2 nanotube arrays (TNAs) material is served as the photoanode. Methanol, ethanediol, and glycerol were chosen as the representative of LMHCs in this study. The adsorption performance of organics on the surface of TNAs was investigated by using the instantaneous photocurrent value. The adsorption constants of FA, methanol, ethanediol, and glycerol were 43.44, 19.32, 7.00, and 1.30, respectively, which indicates that FA has the strongest adsorption property. The degradation performance of these organics and their mixture were observed in a thin-layer reactor. It shows that FA could hardly achieve exhausted mineralization alone, while LMHCs could be easily oxidized completely in the same condition. The degradation degree of FA, which is added LMHCs, improves significantly and the best promotion effect is achieved by glycerol. The promotion effect of LMHCs in the degradation of FA could be contributed to the formation of a tremendous amount of hydroxyl radicals in the NPEC process. The hydroxyl radicals could facilitate the complete degradation of both FA and its intermediate products. Among the chosen LMHCs, glycerol molecule which has three hydroxyls could generate the most hydroxyl radicals and contribute the best effective promotion. This work provides a new way to promote the NPEC degradation of FA and a direction to remove humus from polluted water.Graphical Abstract

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“…In particular, the photoelectrocatalytic (PEC) technology attracts much more attention due to the remarkable merits, such as low cost, good oxidation ability, high efficiency, and no secondary pollutant [9][10][11]. However, the PEC technology has been seldom reported to be used in the degradation of FA [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In the limited previous researches, the feasibility of photocatalytic technology used in the degradation of FA is proved [12][13][14][15]. However, the degradation of FA is inefficient and time-consuming, or the preparation of the catalytic material is very complex [13,14].…”

Section: Introductionmentioning

confidence: 99%

The Promotion Effect and Mechanism of Methanoic Acid on the Photoelectrocatalytic Degradation of Fulvic Acid

Dong

et al. 2016

Journal of Chemistry

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A significant promotion effect of methanoic acid (MA) was proposed in the photoelectrocatalytic (PEC) degradation of fulvic acid (FA) and the degradation mechanism was also discussed. The PEC degradation property of FA and MA was investigated by an assembled thin-layer PEC reactor in which photoanode is TiO2nanotube arrays (TNAs) material. The result shows that only about 40% of FA was degraded, while MA could be completely degraded at the same condition. When mixing MA with FA, it shows a significant improvement in the degradation of FA. For instance, 50 mg/L FA mixed with 45 mg/L MA could achieve exhausted degradation. The results could be attributed to the promotion effect of MA that enhanced the generation of hydroxyl radicals, which maintain the continuous degradation of both FA and the intermediate products during the PEC process. This study proposed a new way of promoting the PEC degradation of FA as well as removing humus from the polluted water.

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Tracing TiO2 photocatalytic degradation of humic acid in the presence of clay particles by excitation–emission matrix (EEM) fluorescence spectra

Cited by 45 publications

References 27 publications

Spectrofluorometric Characterization of Adsorption of Different Molecular Size Fractions of Humic Acid onto Anion-Doped TiO2 Specimens

Spectrofluorometric Characterization of Adsorption of Different Molecular Size Fractions of Humic Acid onto Anion-Doped TiO2 Specimens

The Promotion Effect of Low-Molecular Hydroxyl Compounds on the Nano-Photoelectrocatalytic Degradation of Fulvic Acid and Mechanism

The Promotion Effect and Mechanism of Methanoic Acid on the Photoelectrocatalytic Degradation of Fulvic Acid

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