An investigation of the photocatalytic efficiencies of TiO2 powders on the decolourisation of humic acids

Bekbölet, Miray; Suphandag, Altan Serif; Uyguner, Ceyda Senem

doi:10.1016/s1010-6030(02)00081-3

Cited by 81 publications

(66 citation statements)

References 28 publications

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“…The highest degradation was obtained in the acidic environment (pH = 3.98) next to the neutral ones, and the lowest was observed in the alkaline environment (pH = 9.80). The Sr-TiO 2 /PCFM showed its higher photocatalytic activity under acidic conditions, which suggests that a certain group of HA compounds, such as carboxylic acids, was readily adsorbed onto the Sr-TiO 2 /PCFM surface, confirming the finding of Bekbolet et al [30] that TiO 2 has a strong affinity for HA, especially at low pH. Moreover, it was because the positively charged catalyst surface is conducive to the transferring process of photogenerated electrons to the surface of the catalyst, which contributes to the generation of active radicals such as O 2…”

Section: Effect Of Ph Valuessupporting

confidence: 81%

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Tung¹,

Xu²,

Zhang³

et al. 2018

Pol. J. Environ. Stud.

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Humic substances are among the most important natural organic matters (NOM) existing in ground and surface waters and are known as one of the main disinfection by-product (DBPs) precursors that may act as health risk factors [1]. Humic substances -mainly humic acids (HA), which constitute the major fraction of NOM in water supplies -have been suggested as a standard for mimicking NOM in the laboratory. HA are non-biodegradable and have color, odor, and also exhibit a wide range of distribution in molecular weight and Pol. J. Environ. Stud. Vol. 27, No. 6 (2018), 2765-2774 AbstractA photocatalyst comprised of strontium-doped TiO 2 coated on porous ceramic filter media (Sr-TiO 2 /PCFM) was prepared using the heat-treated process. The main objective of this study was to investigate the effects of catalyst dosage, initial HA concentrations, pH, and temperature on the adsorption and degradation of humic acid (HA) in a solution containing Sr-TiO 2 /PCFM under irradiation of UV light. Removal efficiency of 84.25% for HA was achieved under experimental conditions for a Sr-TiO 2 /PCFM dosage of 80 g at an initial concentration of 15 mg/L over a period of 8 h. Higher degradation was found for HA in the acidic environment and at higher operating temperatures. The rate of the adsorption reaction followed the pseudo second-order kinetics with the sorption isotherm well fitted to the Freundlich and Langmuir isotherm models. The oxidation rate constants of HA were evaluated by using pseudo first-order kinetics that can describe the photodegradation process. Furthermore, the photocatalytic stability of Sr-TiO 2 /PCFM was performed with 3 cycles reused. These findings suggest that the Sr-TiO 2 /PCFM was found to be an effective and promising approach to eliminating HA in water resources.

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Section: Effect Of Ph Valuessupporting

confidence: 81%

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Tung¹,

Xu²,

Zhang³

et al. 2018

Pol. J. Environ. Stud.

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“…Organic pollutants or microorganisms are degraded by holes on the TiO 2 surface, as well as by radicals in the bulk solution (Bhatkhande et al 2002;Bahnemann 2004;Emeline et al 2005;Liu et al 2008). Researchers studying TiO 2 photocatalytic degradation of HA reported that fast and effective removal is dependent on the process conditions (Palmer et al 2002), surface properties of TiO 2 (Bekbolet et al 2002), and water chemistry (Li et al 2002;Al-rasheed and Cardin 2003a;Wiszniowski et al 2004) with humic acid adsorption onto the TiO 2 surface playing a critical role (Wiszniowski et al 2002).…”

Section: Introductionmentioning

confidence: 99%

A Study of the Photocatalytic Oxidation of Humic Acid on Anatase and Mixed-phase Anatase–Rutile TiO2 Nanoparticles

Yiğit

İnan

2009

Water Air Soil Pollut: Focus

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In this study, slurry photocatalytic oxidation process was investigated for natural organic matter removal from aqueous humic acid solutions by using different titanium dioxide (TiO 2 ) under UV-A irradiation. Bench scale experimental studies were conducted at different humic acid concentration at the range of 10-50 mg/L and different pH. Anatase and mixedphase anatase-rutile TiO 2 nano particles used in the photocatalytic reactor. The results were evaluated in terms of the parameters that are specific to organic matter content such as dissolved organic carbon concentration, ultraviolet absorbance at 254 nm (UV 254 ), specific ultaviolet absorbance at 254 nm, and color (VIS 400 ). It was observed that increasing humic acid concentration decreases photocatalytic degradation efficiency. The reactivity of the mixedphase anatase-rutile (Degussa P-25) TiO 2 was greater than individual anatase particles and the highest efficiency was observed at pH 3 for anatase TiO 2 .

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“…A 100 kDa fraction of HA was further used for the preparation of low OM load greywater samples (L1-L3). Moreover, 150 mg¨L´1 HA solution was subjected to partial oxidation via photocatalysis using 0.5 mg¨mL´1 TiO 2 for an irradiation period of 60 min according to the method given by Bekbolet and colleagues [46]. Thus prepared HA solution was comprised of organic fractions mostly oxidized and transformed into lower molecular size fractions.…”

Section: Preparation Of Synthetic Greywater Samplesmentioning

confidence: 99%

“…Continuous stirring was provided by a magnetic stirrer. Detailed information about the experimental procedure was mentioned previously by Bekbolet and co-workers [46]. Evonik P-25 (Evonik Corporation, USA) with a photocatalyst loading of 0.25 mg¨mL´1 was used for both low load and high load greywater samples.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

Uyguner-Demirel

Bekbölet

2016

Catalysts

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This study aimed to investigate TiO 2 photocatalytic degradation of synthetically-prepared greywater samples with differing compositional contents of organic matter (OM), anion concentration, and microbiological consortium. Treatment efficiency was followed through removal of organic matter content in terms of dissolved organic carbon (DOC), specific spectroscopic parameters, and bacterial inactivation. Photocatalytic degradation kinetics were expressed by pseudo first-order kinetic modeling. The best DOC removal rates were attained for greywater samples containing OM with lower molecular size fractions. In addition, either enhancing or reducing the effect of common anions as radical scavengers were observed depending on the composition and concentration of variables in the greywater matrix. Moreover, possibility of a photocatalytic disinfection process was found to be of a bacteria type specific in OM-loaded synthetic greywater samples. Photocatalytic destruction of fecal streptococci required longer irradiation periods under all conditions. Bacterial removal rates were found to be in the order of total coliform > fecal coliform > fecal streptococci, for low organic load greywater, and fecal coliform > total coliform > fecal streptococci, for high organic load greywater.

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An investigation of the photocatalytic efficiencies of TiO2 powders on the decolourisation of humic acids

Cited by 81 publications

References 28 publications

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

A Study of the Photocatalytic Oxidation of Humic Acid on Anatase and Mixed-phase Anatase–Rutile TiO2 Nanoparticles

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

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