Destruction of propyl paraben by persulfate activated with UV-A light emitting diodes

Ioannidi, Alexandra; Frontistis, Zacharias; Mantzavinos, Dionissios

doi:10.1016/j.jece.2018.04.049

Cited by 55 publications

(31 citation statements)

References 34 publications

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“…We have recently demonstrated [47] that the UVA fraction of solar radiation can activate persulfate and generate sulfate radicals according to the reaction:…”

Section: Effect Of Sodium Persulfatementioning

confidence: 99%

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Degradation of Sulfamethoxazole Using Iron-Doped Titania and Simulated Solar Radiation

et al. 2019

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This work examined the photocatalytic destruction of sulfamethoxazole (SMX), a widely used antibiotic, under simulated solar radiation using iron-doped titanium dioxide as the photocatalyst. Amongst the various iron/titania ratios examined (in the range 0%–2%), the catalyst at 0.04% Fe/TiO2 molar ratio exhibited the highest photocatalytic efficiency. The reaction rate followed pseudo-first-order kinetics, where the apparent kinetic constant was reduced as the initial concentration of SMX or humic acid increased. The photodecomposition of SMX was favored in natural pH but retarded at alkaline conditions. Unexpectedly, the presence of bicarbonates (in the range of 0.125–2 g/L) improved the removal of SMX, however, experiments conducted in real environmental matrices showed that process efficiency decreased as the complexity of the water matrix increased. The presence of sodium persulfate as an electron acceptor enhanced the reaction rate. However, only a small synergy was observed between the two individual processes. On the contrary, the addition of tert-butanol, a well-known hydroxyl radical scavenger, hindered the reaction, indicating the significant contribution of these radicals to the photocatalytic degradation of SMX. The photocatalyst retained half of its initial activity after five successive experiments.

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“…We have recently demonstrated [47] that the UVA fraction of solar radiation can activate persulfate and generate sulfate radicals according to the reaction:…”

Section: Effect Of Sodium Persulfatementioning

confidence: 99%

“…Applying Equation (6) for the kinetic constants shown in Figure 11b, S is computed equal to 9%, thus implying a minor synergistic effect. We have recently demonstrated [47] that the UVA fraction of solar radiation can activate persulfate and generate sulfate radicals according to the reaction:…”

Section: Effect Of Sodium Persulfatementioning

confidence: 99%

Degradation of Sulfamethoxazole Using Iron-Doped Titania and Simulated Solar Radiation

et al. 2019

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“…Commercially bottled water was used for experiments in the drinking water matrix. Information about the physico‐chemical properties of the water matrices, such as pH, hardness, alkalinity, and chloride, can be found in our previous study 51 …”

Section: Methodsmentioning

confidence: 99%

Solar light‐induced photocatalytic degradation of methylparaben by g‐C₃N₄ in different water matrices

Πεταλά

Zalaora

Mantzavinos

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: In this study, graphitic carbon nitride (g-C 3 N 4) photocatalyst was successfully synthesized via calcination of urea under argon flow and tested for methyl paraben (MeP) degradation in aqueous media under simulated solar light for the first time. Its structural, morphological, and optical properties were investigated with the use of X-Ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), and Brunauer-Emmett-Teller (BET) surface area analysis method. RESULTS: The as-synthesized g-C 3 N 4 exhibited high photocatalytic performance towards the degradation of MeP in ultra-pure water (UPW), yielding a near-complete elimination after 90 min of irradiation. Experimental results revealed that the photocatalytic reaction followed pseudo-first-order kinetics. Furthermore, the photocatalytic degradation of MeP was found to be strongly pH-dependent. Experiments in real water matrices (bottled water (BW) and wastewater (WW)), as well as in UPW, spiked with inorganic and organic additives (bicarbonate ions, humic acid) affected the target compound degradation. For instance, the apparent rate constant of MeP in UPW was approximately 4 and 8 times greater than that of BW and WW, respectively. The addition of persulfate ions in the reaction mixture enhanced the performance of the present photocatalytic system. Trapping experiments revealed that photogenerated holes play a leading role in the photocatalytic degradation of MeP. CONCLUSION: Our findings demonstrate that g-C 3 N 4 photocatalysis can be used as an efficient technology for the removal of hazardous organic micropollutants, such as parabens.

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“…The photon flux in the UV‐A part of the electromagnetic spectrum, determined by chemical actinometry, was 7.9 × 10 −7 einstein L ‐1 s ‐1 . Some additional experiments were performed with a solar simulator (Newport LCS‐100) equipped with a 100 W xenon, ozone‐free lamp with a photon flux of 7.9 × 10 −7 einstein L ‐1 s ‐1 . Most experiments were performed in duplicate unless otherwise noted.…”

Section: Methodsmentioning

confidence: 99%

The role of operating parameters and irradiation on the electrochemical degradation of tetracycline on boron doped diamond anode in environmentally relevant matrices

Frontistis

Meriç

2018

J of Chemical Tech & Biotech

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BACKGROUND: Nowadays, due to the inappropriate use of antibiotics, significant quantities have been detected in environmental samples. Therefore there is a need for a technology to eliminate the accumulation of pharmaceuticals in receiving water bodies. In recent years electrochemical oxidation showed superior efficiency for the purification of water from pharmaceuticals. RESULTS: boron doped diamond (BDD) showed better efficiency than platinum electrode and stainless steel for the degradation of 500 g L−1 tetracycline (TC) with 0.1 mol L −1 ·Na 2 SO 4 . The presence of 200 mg L −1 bicarbonates decreased the apparent kinetic constant from 0.328 to 0212 min −1 . Instead, the addition of 200 mg L −1 NaCl increased the kinetic constant by almost four times, while the presence of 10 mg L −1 of humic acid decreased the kinetic constant by 18%. The process was favored in real environmental matrices like bottled water and wastewater in comparison with ultrapure water. The use of BDD as both anode and cathode enhanced the efficiency by almost 20%. The presence of UVA or solar radiation increased the decomposition of tetracycline by 14%. Changes in toxicity to Vibrio fisheri bacteria during treatment of TC in the secondary effluent are mainly attributed to the formation of intermediates of the water matrix itself and does not follow the TC removal. CONCLUSIONS: Electrochemical oxidation was favored for removal of TC in real water matrices due to the presence of chlorides. The use of BDD as both anode and cathode with simultaneous solar irradiation is a promising technology for water remediation from TC.

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Destruction of propyl paraben by persulfate activated with UV-A light emitting diodes

Cited by 55 publications

References 34 publications

Degradation of Sulfamethoxazole Using Iron-Doped Titania and Simulated Solar Radiation

Degradation of Sulfamethoxazole Using Iron-Doped Titania and Simulated Solar Radiation

Solar light‐induced photocatalytic degradation of methylparaben by g‐C₃N₄ in different water matrices

The role of operating parameters and irradiation on the electrochemical degradation of tetracycline on boron doped diamond anode in environmentally relevant matrices

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Destruction of propyl paraben by persulfate activated with UV-A light emitting diodes

Cited by 55 publications

References 34 publications

Degradation of Sulfamethoxazole Using Iron-Doped Titania and Simulated Solar Radiation

Degradation of Sulfamethoxazole Using Iron-Doped Titania and Simulated Solar Radiation

Solar light‐induced photocatalytic degradation of methylparaben by g‐C3N4 in different water matrices

The role of operating parameters and irradiation on the electrochemical degradation of tetracycline on boron doped diamond anode in environmentally relevant matrices

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Solar light‐induced photocatalytic degradation of methylparaben by g‐C₃N₄ in different water matrices