Degradation of propyl paraben by activated persulfate using iron-containing magnetic carbon xerogels: investigation of water matrix and process synergy effects

Metheniti, Maria; Frontistis, Zacharias; Ribeiro, Rui S.; Silva, Adrián M.T.; Faria, Joaquim L.; Gomes, Helder; Mantzavinos, Dionissios

doi:10.1007/s11356-017-0178-9

Cited by 36 publications

(34 citation statements)

References 26 publications

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“…Furthermore, carbonate radicals are more selective for electron-rich compounds than hydroxyl radicals [45]. The results of Figure 10b are consistent with those shown in Figure 9 concerning SMX degradation in bottled water, where bicarbonates are the dominant ions at 210 mg/L concentration [46]. It seems that other than bicarbonate ions (e.g.…”

Section: Effect Of Humic Acid Bicarbonate and Tert-butanolsupporting

confidence: 86%

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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Section: Effect Of Humic Acid Bicarbonate and Tert-butanolsupporting

confidence: 86%

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

et al. 2019

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“…In recent years, in an attempt to increase the efficiency of sewage treatment technologies, the simultaneous use of more than one process has been constantly gaining ground. One way to quantify the interaction between two different processes (Process 1 and Process 2) is the degree of Synergy (S), defined as [ 27 ]:

where k Process1/Process2 is the observed kinetic constant from the simultaneous implementation of the two processes

…”

Section: Methodsmentioning

confidence: 99%

Degradation of the Nonsteroidal Anti-Inflammatory Drug Piroxicam by Iron Activated Persulfate: The Role of Water Matrix and Ultrasound Synergy

Frontistis

2018

IJERPH

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This work examined the oxidation of Piroxicam (PIR), a representative nonsteroidal anti-inflammatory drug using iron activated persulfate. The effect of persulfate dosing was vital for the efficiency of the process. The addition of 20 mg/L sodium persulfate (SPS) eliminated 500 μg/L of PIR in less than 20 min at natural pH. PIR decomposition followed pseudo-first-order kinetics, and the observed kinetic constant increased by 2.1 times when the initial concentration of PIR decreased from 2000 to 250 μg/L. Acidic pH favored the PIR destruction, while both sulfate and hydroxyl radicals are involved in PIR destruction at natural pH. The effect of inorganic ions like bicarbonate and chlorides was almost insignificant on PIR removal. The presence of humic acid reduced PIR removal from 100% to 67% after 20 min of treatment with 2 mg/L Fe2+ and 20 mg/L SPS. The experiment that was performed with bottled water showed similar efficiency with ultrapure water, while in the case of secondary effluent, PIR removal decreased by 26% after 30 min of treatment. The Fe2+/SPS/ultrasound hybrid process showed a low degree of synergy (18.3%). The ecotoxicity of aqueous solution using the Vibrio fischeri as an indicator was reduced during the treatment, although with a different trend from the removal of PIR, possibly due to byproducts derived from the oxidation of secondary effluent and PIR.

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“…TiO2 combinations with noble metals (e.g., silver, gold and platinum) [63] or with carbon-based materials such as graphene-based materials [132,133], have also been examined. Other carbon materials have been widely studied, including activated carbons [134,135], carbon xerogels [136], carbon nanotubes [137,138], graphite [139], and more recently graphitic carbon nitride [140]. The suppression of the recombination of photo-generated charge carriers has been attempted, by adding oxidizing agents/electron acceptors (e.g., inorganic peroxides (S2O8 2− ), Fe 3+ , H2O2), doping the material with metal ions or anions, by noble metal loading, dye sensitization or using composite semiconductors [126,141,142].…”

Section: Photocatalysismentioning

confidence: 99%

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Ribeiro

Moreira

Puma

et al. 2019

Chemical Engineering Journal

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429

110

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Micropollutants (MPs) in the aquatic compartments originate from many sources and particularly from the effluents of urban wastewater treatment plants (UWWTPs). Advanced oxidation technologies (AOTs) usually applied after biological processes, have recently emerged as effective tertiary treatments for the removal of MPs, but the oxidation rates of the single compounds may be largely affected by the constituent species of the water matrix. These species include dissolved organic matter and inorganic species (e.g., carbonate, bicarbonate, nitrite, sulphate, chloride). This review analyses the impact of such substances on common AOTs including photolysis, UV/H2O2, Fenton, photocatalysis, and ozone-based processes. The degradation efficiency of single MPs by AOTs results from the combined impact of the water matrix constituents, which can have neutral, inhibiting or promoting effect, depending on the process and the mechanism by which these water components react. Organic species can be either inhibitors (by light attenuation; scavenging effects; or adsorption to catalyst) or promoters (by originating reactive oxygen species (ROS) which enhance indirect photolysis; or by regenerating the catalyst). Inorganic species can also be either inhibitors (by scavenging effects; formation of radicals less active than hydroxyl radicals; iron complexation; adsorption to catalyst or decrease 2 of its effective surface area) or promoters (e.g., nitrate ions by formation of ROS; iron ions as additional source of catalyst). The available data reviewed here is limited and the role and mechanisms of individual water components are still not completely understood. Further studies are needed to elucidate the wide spectrum of reactions occurring in complex wastewaters and to increase the adoption of AOTs in UWWTPs.

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Degradation of propyl paraben by activated persulfate using iron-containing magnetic carbon xerogels: investigation of water matrix and process synergy effects

Cited by 36 publications

References 26 publications

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

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

Degradation of the Nonsteroidal Anti-Inflammatory Drug Piroxicam by Iron Activated Persulfate: The Role of Water Matrix and Ultrasound Synergy

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

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