Evaluation of humic acid photocatalytic degradation by UV–vis and fluorescence spectroscopy

Uyguner, Ceyda Senem; Bekbölet, Miray

doi:10.1016/j.cattod.2005.03.011

Cited by 274 publications

(106 citation statements)

References 31 publications

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“…Ozonation also shifts Type C fluorophores of HOA, HON, and HIA in excitation wavelength to longer wavelengths. The red-shift is ascribed to the increase of carbonyl, hydroxyl, alkoxyl, amino, and carboxyl groups in the structures of the fluorophores (Chen et al, 2003;Ś wietlik and Sikorska, 2004;Uyguner and Bekbolet, 2005). In comparison to ozonation, catalytic ozonation shifts further the peak maxima of some of the examined DOM fractions.…”

Section: Structural Changes Examined By Eemmentioning

confidence: 97%

“…Results show that ozonation decreases the intensities of Type A and Type C fluorophores by about 50-70% for all examined DOM fractions. According to Uyguner and Bekbolet (2005), the intensity decrease indicates the depletion of aromatic structures and the increment of electron withdrawing groups in aromatic compounds. FeOOH sorption only slightly reduces the intensity of Type A and Type C fluorophores of the DOM fractions, indicating that the adsorption of the fluorophores on FeOOH was insignificant.…”

Section: Structural Changes Examined By Eemmentioning

confidence: 99%

“…The position, shift, and intensity of fluorescence peaks can be correlated to structural information such as polycondensation, aromaticity, and the content of functional electron-donating/withdrawing groups (Chen et al, 2003). With respect to investigating oxidation-induced structural changes of DOM, the fluorescence was used to examine the structural changes of DOM before and after chlorination, ozonation, ClO 2 oxidation, and photocatalytic oxidation (Korshin et al, 1999;Win et al, 2000;Ś wietlik and Sikorska, 2004;Uyguner and Bekbolet, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

et al. 2008

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Fluorescence spectra were applied to investigate the structural changes of four dominant dissolved natural organic matter (DOM) fractions of a filtered river water before and after ozonation and catalytic ozonation. The ozonation and catalytic ozonation with synthetic goethite (FeOOH) and cerium dioxide (CeO 2 ) were carried out under normal conditions, i.e. pH 7, reaction time of 10 min, and ozone/DOC ratio of about 1. The fluorescence spectra were recorded at both excitation-emission matrix (EEM) and synchronous scanning modes. EEM results reveal that ozonation of these DOM fractions causes a significant decrease of the aromaticity of humic-like structures and an increase of electron withdrawing groups, e.g., carboxylic groups. The catalysts can further improve the destruction of the humic-like structures in catalytic ozonation. Synchronous spectra reveal that ozonation of hydrophobic acid and hydrophilic acid (HIA) yields a significant amount of by-products with low aromaticity and low molecular weight. Catalytic ozonation enhances substantially the formation of these by-products from HIA and improves the destruction of highly polycyclic aromatic structures for all examined DOM fractions.

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Section: Structural Changes Examined By Eemmentioning

confidence: 97%

Section: Structural Changes Examined By Eemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

et al. 2008

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“…The apparatus operated at excitation wavelength range of 350-650 nm and the bandwidth between the excitation and emission monochromators was Δλ=18 nm. Detailed description of the measurement method is given elsewhere 39, 40 .…”

Section: Total Organic Carbon Contents and Fl Uorescence Spectramentioning

confidence: 99%

Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

Karolczyk

Mozia

Morawski

et al. 2012

Polish Journal of Chemical Technology

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Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO 3 or Mg(OH) 2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly infl uenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confi rmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confi rmed to be an useful method to evaluate concentration of humic acid in water.

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“…In addition to biological activities, solar UV is the most important element in natural disintegration of most organic compounds in soil, water, and air [19]. Surface waters such as river waters contain complex organic substances like humic acids, fulvic acids, glycolic acid, peptides, proteins, aminoacids, lipids, and polysaccharides [20]. Humic acids contain negatively charged ions due to the dissociation of carboxylic acid and hydroxyl functional groups and also possess amphipathic character owing to the presence of both hydrophobic and hydrophilic moieties [21].…”

Section: International Journal Of Electrochemistrymentioning

confidence: 99%

Solar UV Photooxidation as Pretreatment for Stripping Voltammetric Trace Metal Analysis in River Water

Woldemichael

Tulu

Flechsig

2011

International Journal of Electrochemistry

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The application of solar ultraviolet radiation as sample pretreatment or preparation step in stripping voltammetric analysis of trace metals in presence of low levels of dissolved organic carbon (DOC) natural water samples (river water) was studied. River water samples were collected from downstream of Warnow river (Germany) and acidified to pH of 2 ± 0.2 (by addition of 1 mL of ultrapure 65% HNO 3 per liter sample). Furthermore, 100 μL/L of hydrogen peroxide solution (ultrapure, 30% H 2 O 2 ) was added to the samples as photochemical reaction initiator. The samples were transferred to polyethylene terephthalate (PET) bottles and irradiated with solar radiation of UV-A intensity of 3.6 mW/m 2 for six hours, and the concentrations of Zn, Cd, Pb, and Cu were determined by differential pulse anodic stripping voltammetry (DPASV). The comparison of the values with the results obtained for the original untreated sample and artificial UV-treated one proved that solar UV radiation can be applied to the digestion of dissolved organic carbon in trace metal analysis in natural waters like river water, lake waters, well waters, and so forth.

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Evaluation of humic acid photocatalytic degradation by UV–vis and fluorescence spectroscopy

Cited by 274 publications

References 31 publications

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

Solar UV Photooxidation as Pretreatment for Stripping Voltammetric Trace Metal Analysis in River Water

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