Heterogeneous photocatalytic degradation of ibuprofen in ultrapure water, municipal and pharmaceutical industry wastewaters using a TiO2/UV-LED system

Jallouli, Nabil; Pastrana‐Martínez, Luisa M.; Ribeiro, Ana R.; Moreira, Nuno F.F.; Faria, Joaquim L.; Hentati, Olfa; Silva, Adrián M.T.; Ksibi, Mohamed

doi:10.1016/j.cej.2017.10.045

Cited by 265 publications

(87 citation statements)

References 70 publications

(55 reference statements)

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“…0.3 eV is observed for TiO 2 ‐B relative to Evonik‐P25 TiO 2 and TiO 2 ‐M. While the explanation of this shift is not clear, the results are reproducible, and are important since the increased overlap of the absorption of the photocatalyst and solar irradiation favours the photocatalytic processes, while, in addition, this small shift in the band onset may be useful when cheap near‐UV LEDs are used as the irradiation source in photoreactors.…”

Section: Resultsmentioning

confidence: 89%

“…The major primary photodegradation products of IBP on TiO 2 have previously been reported to result either from parallel reactions of hydroxyl attack and decarboxylation, without indication of how decarboxylation occurs,, or from sequential reactions in which decarboxylation follows an initial hydroxyl radical attack . We first searched for these products by LC–MS.…”

Section: Resultsmentioning

confidence: 99%

“…However, although a number of studies have been published on TiO 2 photocatalysed degradation of IBP and NPX,, these have tended to focus more on the kinetics, catalytic efficiency and mineralization. Product identification, which is a key to mechanistic understanding, was only carried out in two cases ,. There is clearly a need for more detailed insights into the mechanism of the photodegradation, which will be crucial for the rational design of TiO 2 photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Titanium Dioxide Nanoparticle Photocatalysed Degradation of Ibuprofen and Naproxen in Water: Competing Hydroxyl Radical Attack and Oxidative Decarboxylation by Semiconductor Holes

et al. 2018

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The accumulation of pharmaceuticals in the environment is of major concern, and efficient procedures are needed to eliminate them. Inorganic semiconductor photocatalysts, such as titanium dioxide, offer a promising solution. We compare the photocatalytic degradation of the two non‐steroidal anti‐inflammatory drugs ibuprofen (IBP) and naproxen (NPX) by TiO2 nanoparticles in water. Photocatalysts synthesized using different methods were evaluated and compared with commercially available Evonik‐P25 TiO2, and with direct photodegradation. The synthesized nanoparticles show high photocatalytic activity towards IBP (>97% degradation) and NPX (>90% degradation), and up to 79% mineralization is observed with NPX, and ca 50% with IBP. Major IBP photoproducts were 1‐(4‐isobutylphenyl)ethanol, 1‐(4‐isobutylphenyl)ethanone and 1‐(4‐ethylphenyl)‐2‐methylpropan‐1‐ol, while photocatalysis of NPX, showed the formation of 1‐(6‐methoxynaphthalen‐2‐yl)ethanol and 1‐(6‐methoxynaphthalen‐2‐yl)ethanone. The results were rationalized by considering one major primary pathway that involves initial decarboxylation of a chemisorbed compound followed by degradation of the radical intermediate produced. Our findings strongly suggest that with these compounds possessing carboxylic acid groups, the degradation mechanism involves competition between oxidative decarboxylation of chemisorbed compounds by semiconductor holes, and hydroxyl radical attack on physisorbed substrates.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Titanium Dioxide Nanoparticle Photocatalysed Degradation of Ibuprofen and Naproxen in Water: Competing Hydroxyl Radical Attack and Oxidative Decarboxylation by Semiconductor Holes

et al. 2018

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“…) but above mentioned intermediates (A, B and C) are the major degradation products with higher relative abundance, which suggests that hydroxylation is the main pathway in the IBP degradation (Yingying et al. , Jallouli et al., ). Possible degradation route is given below.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation of ibuprofen in water using TiO₂ and ZnO under artificial UV and solar irradiation

Tanveer

Guyer²,

Abbas

2019

Water Environment Research

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The degradation of anti‐inflammatory and antipyretic drug (Ibuprofen; IBP) has been described in this study by using photocatalytic‐based advanced oxidation processes. The catalysts (TiO2 and ZnO) were activated by irradiation of artificial UV lamp and solar rays for the generation of highly oxidizing species which resulted in the degradation of IBP to intermediates and finally to carbon dioxide and water. In solar reactor, quartz and borosilicate tubes were installed for absorption of required ultraviolet rays and curved chrome plates were used to reflect and concentrate rays on the tubes containing feed mixture. The liquid chromatography, Total organic carbon (TOC), and Chemical oxygen demand (COD) tests were employed to determine the degradation rates and demineralization of solution samples. At catalyst dosing of 1–1.5 g/L, TiO2‐based experiments showed high degradation rate under acidic conditions. Similarly, for ZnO catalyst, 1 g/L dozing rate was found to be effective under neutral conditions (pH = 7.0). UV lamp‐based photocatalysis had higher degradation rate as compared to that of solar reactor. Moreover, better absorption of solar rays by quartz tubes resulted in higher degradation than that in borosilicate tubes. For UV lamp photocatalysis, the TOC and COD reduction was higher. With improved catalyst doping and better solar reactor design, solar‐based IBP degradation could be more promising than UV‐based catalysis. Practitioner points TiO2 and ZnO were employed to generate oxidizing agents for comparative photocatalytic degradation. Degradation rate of Ibuprofen with TiO2 was much higher compared to ZnO. Quartz material was found more effective as radiation absorbing material than borosilicate glass for solar photo catalysis. Influence of catalyst loading (TiO2 and ZnO) and pH conditions on degradation rate and mineralization of IBP was examined. IBP is a carcinogenic and endocrine disrupting drug so its degradation in water can protect ecological and human life.

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“…Therefore, researchers have found that advanced oxidation processes (AOPs) can eliminate the refractory contaminants (including emerging contaminants and PPCPs) in aqueous environments, which deserves major attention [9][10][11][12][13][14]. Moreover, one of these technologies is solar photocatalysis (PC), which can degrade organic pollutants by means of the photocatalytic reaction promoted by the action of light on the surface of a semiconductor acting as a photocatalyst [15].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Wang

et al. 2018

Catalysts

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Abstract:In the present work, the photocatalytic performance of P25TiO 2 was investigated by means of the degradation of aspirin, while the reaction system was systematically optimized by central composite design (CCD) based on the response surface methodology (RSM). In addition, three variables of initial pH value, initial aspirin concentration and P25 concentration were selected to assess the dependence of degradation efficiencies of aspirin. Meanwhile, a predicted model of degradation efficiency was estimated and checked using analysis of variance (ANOVA). The results indicated that the PC removal of aspirin by P25 was significantly influenced by all these variables in descending order as follows: P25 concentration > initial aspirin concentration > initial pH value. Moreover, the parameters were optimized by the CCD method. Under the conditions of an initial pH value of 5, initial aspirin concentration of 10 mg/L and P25 concentration of 50 mg/L, the degradation efficiency of aspirin was 98.9%with 60 min of Xenon lamp irradiation. Besides, based on the liquid chromatography-mass spectrometry measurements, two main PC degradation pathways of aspirin by TiO 2 were deduced and the tentative degradation mechanism was also proposed.

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Heterogeneous photocatalytic degradation of ibuprofen in ultrapure water, municipal and pharmaceutical industry wastewaters using a TiO2/UV-LED system

Cited by 265 publications

References 70 publications

Titanium Dioxide Nanoparticle Photocatalysed Degradation of Ibuprofen and Naproxen in Water: Competing Hydroxyl Radical Attack and Oxidative Decarboxylation by Semiconductor Holes

Titanium Dioxide Nanoparticle Photocatalysed Degradation of Ibuprofen and Naproxen in Water: Competing Hydroxyl Radical Attack and Oxidative Decarboxylation by Semiconductor Holes

Photocatalytic degradation of ibuprofen in water using TiO₂ and ZnO under artificial UV and solar irradiation

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

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Heterogeneous photocatalytic degradation of ibuprofen in ultrapure water, municipal and pharmaceutical industry wastewaters using a TiO2/UV-LED system

Cited by 265 publications

References 70 publications

Titanium Dioxide Nanoparticle Photocatalysed Degradation of Ibuprofen and Naproxen in Water: Competing Hydroxyl Radical Attack and Oxidative Decarboxylation by Semiconductor Holes

Titanium Dioxide Nanoparticle Photocatalysed Degradation of Ibuprofen and Naproxen in Water: Competing Hydroxyl Radical Attack and Oxidative Decarboxylation by Semiconductor Holes

Photocatalytic degradation of ibuprofen in water using TiO2 and ZnO under artificial UV and solar irradiation

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

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Photocatalytic degradation of ibuprofen in water using TiO₂ and ZnO under artificial UV and solar irradiation