UV-assisted persulfate oxidation: the influence of cation type in the persulfate salt on the degradation kinetics of an azo dye pollutant

Peternel, Igor; Kušić, Hrvoje; Marin, Vedrana; Koprivanac, Natalija

doi:10.1007/s11144-012-0502-9

Cited by 19 publications

(6 citation statements)

References 21 publications

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“…In the case of TiO 2 /UV/H 2 O 2 , the final products of dyes degradation are carbon dioxide, water and inert salts (Muruganandham et al, 2004b, Sharma et al, 2016. The persulfates have high solubility and stability at ambient temperature, while the sulfate ions, which are the major products of persulfate reduction, are relatively harmless and considered to be environmentally friendly (Peternel et al, 2012, Olmez-Hanci et al, 2014. Therefore, these processes are a promising environmental engineering technique.…”

Section: Comparison Of Decolorization By Tio 2 /Uv/kbro 3 Tio 2 /Uvmentioning

confidence: 99%

Heterogeneous photocatalytic degradation of anthraquinone dye Reactive Blue 19: optimization, comparison between processes and identification of intermediate products

Vučić

Mitrović

Kostić

et al. 2020

WSA

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Treatment of textile wastewater using heterogeneous photocatalysis began in the the last decade and attracted the attention of researchers due to its versatile application. The variety of applications of TiO2 as a photocatalyst was due toits numerous positive properties, such as low operating temperature, biologically inert nature, low energy consumption, water insolubility, availability and photoactivity, low toxicity, high chemical stability, suitable flat band potential, narrow bandgap and the fact that it is environmentally benign. Heterogeneous UV-TiO2 photocatalysis is capable of removing organic pollutants from textile wastewater; this has been widely studied, with the technology also having been commercialized in many developing countries. Decolorization of anthraquinone dye Reactive Blue 19 (RB 19) by heterogeneous advanced oxidation processes TiO2/UV/H2O2, TiO2/UV/KBrO3 and TiO2/UV/(NH4)2S2O8 was studied under different conditions and in the presence of electron acceptors such as hydrogen peroxide (H2O2), potassium bromate (KBrO3) and ammonium persulphate ((NH4)2S2O8). Decolorization was very fast for all three processes, and complete dye decolorization was achieved in 10 min. The effect of various ions (Cl–, SO42– and HCO3–) on RB 19 decolorization was also studied. The optimal condition for the decolorization of the dye were determined to be: TiO2 concentration 1 g∙dm–3, electron acceptor concentration 30.0 mmol∙dm–3, dye concentration 50.0 mg∙dm–3, UV intensity 1 950 μW∙cm–2, at temperature 25 ± 0.5°C. In addition, experiments were performed and compared in three different matrices. In the surface water and dyebath effluent water, the removal efficiency for RB 19 was lower than that achieved in the deionized water because of the interference of complex constituents in the surface water and effluent. LC-MS analysis was carried out and the detected intermediates were compared with the previously published data for anthraquinone dyes.

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Section: Comparison Of Decolorization By Tio 2 /Uv/kbro 3 Tio 2 /Uvmentioning

confidence: 99%

Heterogeneous photocatalytic degradation of anthraquinone dye Reactive Blue 19: optimization, comparison between processes and identification of intermediate products

Vučić

Mitrović

Kostić

et al. 2020

WSA

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“…As the applied potential and current density are maintained, more hydroxyl radicals will be generated because the energy barrier for this reaction decreases and more energetic valence band holes on the anode surface become available for the reaction. In addition, the reduction potential further decreases as the pH increases from 4 to 11. persulfate, which can significantly scavenge hydroxyl radicals [59,60] Table 1 3.6. Discussion of the mass transfer impact A number of studies have reported a mass transfer limitation in electrochemical systems [41,44,45].…”

Section: Oxidation Byproduct Analysismentioning

confidence: 99%

Electrochemical oxidation of ofloxacin using a TiO2-based SnO2-Sb/polytetrafluoroethylene resin-PbO2 electrode: Reaction kinetics and mass transfer impact

Xie

Meng

Sun

et al. 2017

Applied Catalysis B: Environmental

216

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Electrochemical oxidation has been proposed for the destruction of organic contaminants; however, this process is hampered by low oxidation efficiency and high energy cost. Accordingly, we developed a TiO2-based SnO2-Sb/polytetrafluroethylene resin (FR)-PbO2 electrode that was based on TiO2 nanotubes. We tested the performance of the electrode on an antibiotic, ofloxacin, and identified the major pathway of ofloxacin oxidation. We found growing TiO2 nanotubes on Ti material increased current efficiency, and the electrical efficiency per order (EE/O, kWh/m 3) for oxidation was decreased by 16.2%. Our electrode requires a large overpotential before electrons flow, which minimizes oxygen evolution, reduces hydrogen peroxide and ozone generation, and favors hydroxyl radicals (HO•) production. We found the electron efficiency (EE) during oxidation was as high as 88.45%. In other words, 88.45% of the electrons that flow out of the electrode cause oxidation. The effects of current density, initial concentration, pH value and electrolyte concentration were investigated. A differential column batch reactor (DCBR) was used to simulate the performance of continuous plug flow reactor and we found that the destruction of ofloxacin followed pseudo-first order model. We also evaluated the impact of mass transfer on electrochemical performance. The effects of fluid velocity and electrode spacing on oxidation rate were evaluated by determining the mass transfer coefficient and the effectiveness factor Ω (between 0-1). Our experiments and calculations indicated that the mass transfer reduced oxidation rate by more than 55% (Ω<0.45) for an electrode spacing of 1 cm at a fluid velocity of 0.033 m/s. Unlike studies carried out using completely mixed batch reactor, the DCBR can simulate the flow conditions in pilot or full scale reactors; consequently, observed pseudo-first order rate constants in the DCBR can be used for preliminary design.

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“…The radiant power at wavelength applied determines the yield of generated radicals with respect to the oxidant concentration . The reactor geometry determines the effective path length, which is inversely proportional to the yield of generated radicals and the flow regime, whereas turbulent flow is preferable in order to overcome the mass-transfer limitations. , The characteristics of wastewater, i.e., the pollutant structure, presence of HO • scavengers, and suspended solids, play an important role because of scavenging reactions and photon-shielding effects. ,, The UV/H 2 O 2 process is based on the application of a UV–C irradiation source, typically operating at 254 nm, and the addition of H 2 O 2 , a strong oxidant with good operational features (e.g., easy dissolution in water, which could be limiting in the application of S 2 O 8 2– ), low operational costs (e.g., UV/O 3 requires a unit for ozone generation), and rather low environmental impact…”

Section: Introductionmentioning

confidence: 99%

“…16,17 The characteristics of wastewater, i.e., the pollutant structure, presence of HO • scavengers, and suspended solids, play an important role because of scavenging reactions and photon-shielding effects. 12,13,17 The UV/H 2 O 2 process is based on the application of a UV−C irradiation source, typically operating at 254 nm, and the addition of H 2 O 2 , a strong oxidant with good operational features (e.g., easy dissolution in water, which could be limiting in the application of S 2 O 8 2− ), 18 low operational costs (e.g., UV/O 3 requires a unit for ozone generation), 6 and rather low environmental impact. 6 Because it is demonstrated that in well-mixed reactor systems and the absence of suspended solids, besides the operating pH and [H 2 O 2 ], the pollutant structure may play an important role because of the competitive kinetics for generated HO • , 12,13 the intention of this study was to investigate the degradation of ACAs from the structural aspect.…”

Section: Introductionmentioning

confidence: 99%

Photooxidative Degradation of Aromatic Carboxylic Acids in Water: Influence of Hydroxyl Substituents

Milovac

Juretić

Kušić

et al. 2014

Ind. Eng. Chem. Res.

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The UV/H 2 O 2 process was applied for the degradation of aromatic carboxylic acids (ACAs). Benzoic acid, salicylic acid, gentisic acid, and gallic acid are chosen as typical water pollutants representing ACAs with the increased number of hydroxyl groups. The effect of the structural characteristics of ACAs and UV/H 2 O 2 process parameters on their degradation kinetics was investigated by a statistical/empirical approach employing the design of experiments and response surface methodology. Different optimal conditions for maximal degradation rates were established, while degradation rates followed the decreasing order benzoic acid > salicylic acid > gentisic acid > gallic acid with the increasing number of hydroxyl groups. The inversed order was established in the case of mineralization kinetics. Structurally influenced degradation pathways of studied ACAs, with the shared sequence related to the preferable hydroxylation position at the benzene ring, are reflected in the observed changes in the biodegradability and toxicity toward Vibrio fischeri during UV/H 2 O 2 treatment.

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UV-assisted persulfate oxidation: the influence of cation type in the persulfate salt on the degradation kinetics of an azo dye pollutant

Cited by 19 publications

References 21 publications

Heterogeneous photocatalytic degradation of anthraquinone dye Reactive Blue 19: optimization, comparison between processes and identification of intermediate products

Heterogeneous photocatalytic degradation of anthraquinone dye Reactive Blue 19: optimization, comparison between processes and identification of intermediate products

Electrochemical oxidation of ofloxacin using a TiO2-based SnO2-Sb/polytetrafluoroethylene resin-PbO2 electrode: Reaction kinetics and mass transfer impact

Photooxidative Degradation of Aromatic Carboxylic Acids in Water: Influence of Hydroxyl Substituents

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