Photocatalytic degradation of methylparaben by TiO2: Multivariable experimental design and mechanism

Lin, Yixin; Ferronato, Corinne; Deng, Nansheng; Wu, Feng; Chovelon, Jean‐Marc

doi:10.1016/j.apcatb.2008.09.026

Cited by 142 publications

(104 citation statements)

References 46 publications

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“…The latter route was easier to occur than the former in the presence of O 2 , and the degradation products were HOO • and MPB-OH, in line with the experimental results [17,19]. This theoretical finding can further explain the experimental results as to why the O atom of O 2 cannot be incorporated into the degradation product through direct coupling between molecular O 2 and substrate-based radicals during AOPs [42].…”

Section: Subsequent Reactions Of Oh-addition and H-abstraction Intermsupporting

confidence: 83%

“…In the aqueous-phase AOPs, MPB degradation was mainly initiated by • OH [17]. Thus, all the possible routes for MPB + • OH reaction were thoroughly considered and summarized in Fig.…”

Section: Initial Reaction Of Mpb With • Ohmentioning

confidence: 99%

“…Over past few years, various AOPs including photocatalysis [17,18], ozone oxidation [19], UV irradiation [20] with the in situ production of highly reactive hydroxyl radicals ( • OH), as the main oxidants, have been frequently employed to degrade MPB experimentally. However, some studies only optimized experimental conditions without considering MPB degradation mechanism [18,20,21].…”

Section: Introductionmentioning

confidence: 99%

“…However, some studies only optimized experimental conditions without considering MPB degradation mechanism [18,20,21]. Some proposed that • OH can attack both the alkyl chain and benzene ring of MPB based on experimental determination of intermediates [17,19]. However, the specific reaction sites in MPB and pathways involved are still unclear.…”

Section: Introductionmentioning

confidence: 99%

“…However, the specific reaction sites in MPB and pathways involved are still unclear. For example, a tentative reaction pathway reported that MPB is mainly attacked by • OH at -CH 3 and -H in the aromatic ring [17], hydroxylation at the aromatic ring and hydrogen abstraction were the degradation mechanism of MPB in ozonation [19]. Nevertheless, these studies on quantitative distribution and potential toxicities of products during MPB degradation using AOPs have not yet been concerned, even though this information is very important for environmental protection.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Computational consideration on advanced oxidation degradation of phenolic preservative, methylparaben, in water: mechanisms, kinetics, and toxicity assessments

Gao

Fang

et al. 2014

Journal of Hazardous Materials

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Section: Subsequent Reactions Of Oh-addition and H-abstraction Intermsupporting

confidence: 83%

“…In the aqueous-phase AOPs, MPB degradation was mainly initiated by • OH [17]. Thus, all the possible routes for MPB + • OH reaction were thoroughly considered and summarized in Fig.…”

Section: Initial Reaction Of Mpb With • Ohmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Computational consideration on advanced oxidation degradation of phenolic preservative, methylparaben, in water: mechanisms, kinetics, and toxicity assessments

Gao

Fang

et al. 2014

Journal of Hazardous Materials

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Application of response surface methodology for optimization of trace amount of diazinon preconcentration in natural waters and biological samples by carbon mesoporous CMK‐3

Beirami

Barzoki

Bahramifar

2017

Biomedical Chromatography

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Preconcentration of trace amounts of diazinon by carbon mesoporous CMK-3 in water and biological samples and measurement by high-performance liquid chromatography were investigated. CMK-3 was prepared using hexagonal SBA-15 as the template. The synthesized materials were characterized by X-Ray diffraction (XRD), Fourier transform infrared spectroscopy, Brunaur-Emmet-Teller, transmission electron microscopy and Boehm titration method. The preconcentration procedure was optimized using a multivariate optimization approach following a two-stage process. The effect of analytical parameters including the amount of the CMK-3 as an adsorbent, pH, type and volume of eluent and flow rate of eluent and sample were studied by a screening project, then the effective parameters were optimized by response surface methodology based on central composite design. The average extraction efficiency of diazinon under optimal conditions (CMK-3 dosage = 25 mg, sample flow rate = 2.5 mL min , eluent flow rate = 1.25 mL min , volume of methanol as an eluent =3.5 mL and initial pH = 6) was 97.11%, which agrees well with the predicted response value (97.93%). The linearity of the method was in the range of 0.5-100 μg L with a correlation coefficient of 0.997. Enrichment factor, limit of detection and limit of quantification were 285.7, 0.09 and 0.23 μg L , respectively. The relative standard deviation (RSD) under optimum conditions was 2.21% (n = 5). The proposed method was applied to determine diazinon in real water and biological samples. Recovery of diazinon from real samples was between 95.80 and 104.94% with an RSD of 0.19-4.65%. Thus, this method is suitable for the preconcentration and determination of diazinon in real water and biological samples.

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Pharmaceuticals, Personal Care Products and Endocrine Disrupting Agents in the Environment – A Review

Caliman

Gavrilescu²

2009

CLEAN Soil Air Water

364

163

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In the last few years, concerns about the environmental fate and behavior of synthetic organic chemicals for hygienic use detected in waters have increased. Several of these compounds are used intensively, in large volumes, are persistent, bioactive and exhibit bioaccumulation and endocrine disrupting activity. Some pharmaceuticals, including analgesics, antibiotics, antiepilieptics, β‐blockers, blood‐lipid regulators and contraceptives also have the potential to determine various physiologic responses in aquatic organisms. Other compounds (natural hormones and several industrial and household chemicals) able to affect organisms in receiving waters are also endocrine disrupting agents. A lack of information still exists regarding the potential impact associated with the occurrence, fate and ecotoxicological effects of endocrine disruptors, including pharmaceuticals and personal care compounds in the environment since few compounds were inventoried or regulated worldwide. In some cases, there are no legal requirements to assess the impact of long‐term exposure to low concentration of these chemicals. This may be because important classes of these compounds have not been studied in detail up to now due to the non‐availability of suitable instrumental techniques or analytical standards for low concentration levels. Recently, the appearance of sophisticated tests for monitoring environmental contamination has revealed the presence of these types of contaminants at lower levels, down to nanograms per liter. This constitutes an important tool in the development of guidelines to monitor and/or update environmental compliance reports. The current survey aims to combine information from the literature on the environmental occurrence, fate and effects of personal care products and endocrine disrupting agents on the environment; as well as on the treatment options for their removal from wastewaters.

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Photocatalytic degradation of methylparaben by TiO2: Multivariable experimental design and mechanism

Cited by 142 publications

References 46 publications

Computational consideration on advanced oxidation degradation of phenolic preservative, methylparaben, in water: mechanisms, kinetics, and toxicity assessments

Computational consideration on advanced oxidation degradation of phenolic preservative, methylparaben, in water: mechanisms, kinetics, and toxicity assessments

Application of response surface methodology for optimization of trace amount of diazinon preconcentration in natural waters and biological samples by carbon mesoporous CMK‐3

Pharmaceuticals, Personal Care Products and Endocrine Disrupting Agents in the Environment – A Review

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