Significance of analytical parameters for the understanding of natural organic matter in relation to photocatalytic oxidation

Uyguner-Demirel, Ceyda Senem; Bekbölet, Miray

doi:10.1016/j.chemosphere.2011.05.003

Cited by 127 publications

(50 citation statements)

References 266 publications

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“…The research on the NOM/TiO 2 interactions was so far limited to the photodegradation of NOM by TiO 2 [7,[9][10][11][13][14][15][16]. However, it is reported that the removal of Cr(IV), by using TiO 2 photocatalysis, was greatly enhanced when the system contained both HA and Cr(VI) [16] and also that HA coating enhanced the adsorption of Cd(II) to nano-TiO 2 [6].…”

Section: Introductionmentioning

confidence: 94%

The effect of NOM to TiO2: interactions and photocatalytic behavior

Δρόσος

Ren

Frimmel

2015

Applied Catalysis B: Environmental

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Section: Introductionmentioning

confidence: 94%

The effect of NOM to TiO2: interactions and photocatalytic behavior

Δρόσος

Ren

Frimmel

2015

Applied Catalysis B: Environmental

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“…However, most such studies have focused on monitoring changes in DOM, monitoring decreases in color intensity, or identifying factors that influence the speed of the photochemical reactions (Valencia et al 2013). Techniques such as fluorescence spectroscopy have been used to monitor changes in the compositions and reactivities of AHS for photocatalytic oxidation in only a few studies (Uyguner-Demirel and Bekbolet 2011;Valencia et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Characterizing the photochemical degradation of aquatic humic substances from a dystrophic lake using excitation-emission matrix fluorescence spectroscopy and parallel factor analysis

et al. 2016

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Three-dimensional excitation-emission matrix (EEM) fluorescence and parallel factor analysis (PAR-AFAC) were used to monitor composition and reactivity changes caused by the photochemical degradation of aquatic humic substances (AHS) from a dystrophic lake in Kushiro Wetland, Japan. AHS-rich lake water was exposed to three treatments in summer and winter 2014: radiation with the full solar wavelength range, radiation with the [320-nm solar wavelength range, and no solar radiation. Irradiation caused AHS-like peaks to shift to shorter wavelengths in the EEM contour plots, implying that AHS photodegradation caused the formation of lower-molecular-weight fractions or more simply structured components. Three components were identified from PARAFAC analyses: AHS-1 (excitation/emission wavelengths of maxima: \252 and 315 nm/426 nm), AHS-2 (360 and 261 nm/489 nm), and AHS-3 (276 nm/403 nm). These components had different photosensitivities. AHS-1 was most sensitive to full solar radiation, while AHS-2 was most sensitive to [320-nm radiation. More photodegradation of these components occurred in the summer than in the winter, indicating that photodegradation depended on light intensity. AHS-3 was photoresistant. The different characteristics of the components reflected the in situ dynamics of the components. The AHS-3 fluorescence intensity was positively correlated with the dissolved organic carbon concentration but the AHS-1 and AHS-2 fluorescence intensities were not. The EEM-PARAFAC method was found to be a good tool for tracing AHS-like materials in situ and in the laboratory.

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“…28, No. 9, 2017 photo-Fenton process, humic and fulvic acids, naturally present in the landfill leachate, tend to precipitate dissolved iron or form stable iron complexes, 23,24 compromising the photocatalytic process.…”

Section: Introductionmentioning

confidence: 99%

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

Silva¹,

Júnior²,

Silva³

et al. 2017

J. Braz. Chem. Soc.

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This study reports a protocol for the treatment of a sanitary landfill leachate through integration between a stage of coagulation-flocculation, a step of filtration of the resulting suspension, and application of the photo-Fenton process using a ferrioxalate complex and solar irradiation. The best results for turbidity removal by coagulation-flocculation were reached using Al 3+ as nitrate salt mainly using concentrations up close 4.4 mmol L -1 , at the natural pH of the effluent (pH 7.9), when the removal of 66% of the turbidity was achieved. By using a ferrioxalate complex after adjusting the pH of the effluent to 5, it was possible to circumvent the classical limitations of the Fenton process (related to the pH of the medium limited to between 2.5 and 3.0), performing a removal of 68% of the remaining dissolved organic carbon. The global dissolved organic carbon removal in this process was of 86% after a membrane filtration step before the photo-Fenton process.

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Significance of analytical parameters for the understanding of natural organic matter in relation to photocatalytic oxidation

Cited by 127 publications

References 266 publications

The effect of NOM to TiO2: interactions and photocatalytic behavior

The effect of NOM to TiO2: interactions and photocatalytic behavior

Characterizing the photochemical degradation of aquatic humic substances from a dystrophic lake using excitation-emission matrix fluorescence spectroscopy and parallel factor analysis

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

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