Sonophotocatalytic degradation of alazine and gesaprim commercial herbicides in TiO2 slurry

Bahena, Cristina Lizama; Martı́nez, Susana Silva; Guzmán, Daniel Morales; Hernández, Ma. del Refugio Trejo

doi:10.1016/j.chemosphere.2007.11.007

Cited by 53 publications

(25 citation statements)

References 15 publications

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“…When the frequency increased to 500 kHz, the atrazine degradation rate increased to 100% [15]. When the power increased to 500 W, the atrazine degradation rate increased to >81% [13]. Generally, in the presence of the same sonication power and frequency, the chemical atrazine degradation decreases when the sonication horn is changed to the sonication bath, and aqueous solution is changed to the sediment slurry.…”

Section: Discussionmentioning

confidence: 87%

“…The chemical decomposition of atrazine by advanced oxidation methods like sonication has also been studied [12][13][14][15][16][17][18]. Mild sonication homogenizes suspensions, enhances extraction, and increases microbial productivity, while strong sonication conditions disrupt cells and cause the chemical degradation of xenobiotics [16,[19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Mild sonication homogenizes suspensions, enhances extraction, and increases microbial productivity, while strong sonication conditions disrupt cells and cause the chemical degradation of xenobiotics [16,[19][20][21][22][23]. Sonication separately and in combination with other advanced oxidation processes has induced chemical atrazine degradation in an aqueous solution [13][14][15]18].…”

Section: Introductionmentioning

confidence: 99%

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Sonication Effects on Atrazine Dissipation in Vadose Zone Sediment Slurries

Kerminen

Kontro

2017

Environments

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Herbicide atrazine easily leaches to groundwater, where it is persistent. We studied whether sonication accelerates atrazine dissipation (100 mg·L −1 ) in vadose zone sediment slurries. Sediments were from 11.3 to 14.6 m depths in an atrazine-contaminated groundwater area. The slurries and autoclave-sterilized slurries were sonicated (bath, 43 kHz, 320 W) for 0, 5, 10, 20, or 30 min once/twice a day, and atrazine concentrations were followed. Atrazine concentrations raised in the sterilized slurries sonicated twice a day for 10 min (86.0 ± 7.7 mg·L −1 ), while they remained low in the slurries (56.6 ± 10.9 mg·L −1 ) due to microbial degradation. Twice a day sonications for 20-30 min did not enhance microbial atrazine degradation. Chemical dissipation may have occurred in the sterilized slurries sonicated twice a day for 30 min. However, sonication did not decrease atrazine concentrations below those in the non-sonicated slurries (55.1 ± 7.8 mg·L −1 ) and sterilized slurries (67.1 ± 7.9 mg·L −1 ). Atrazine concentrations in the sterilized slurries were higher than in the slurries, indicating changes in sediment structure and adsorption due to autoclaving. Sonication parameters needed for releasing atrazine from interactions with particles may be close to those damaging microbial cells. This suggests difficulties in enhancing microbial atrazine degradation by sonication, though chemical degradation can be enhanced.

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Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sonication Effects on Atrazine Dissipation in Vadose Zone Sediment Slurries

Kerminen

Kontro

2017

Environments

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“…The number of active surface sites increases with TiO 2 concentration until certain loading since light penetration decreases and aggregation of TiO 2 particles increases at relative high catalyst loading [159]. It has been reported that TiO 2 photocatalysis combined with ultrasound can be benefited [72,97,159,160] due to different factors like (a) an increase in the catalyst surface area due to the aggregation action of ultrasound, which enhances the performance of the photocatalytic system [161]; (b) an improvement of mass transfer of organic compounds between the liquid phase and the TiO 2 surface [162,163]; and (c) a reduction of charge recombination and promotion production of additional OH • due to the residual H 2 O 2 generated [162,163]. Also, the continuous cleaning of the TiO 2 surface by acoustic cavitation [164] might also have some role in modifying the photocatalytic rate.…”

Section: Influence Of Catalyst Concentrationmentioning

confidence: 99%

“…Also, the initial pH of the solution influences the rate of the degradation process. It has been reported that the adsorption of the organic compounds onto the TiO 2 surface is affected by the pH of the solution [97,160]. The pollutant and thus the rates of degradation will be maximum near the point of zero charge (pzc) of the catalyst [164].…”

Section: Influence Of Initial Pollutantmentioning

confidence: 99%

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Gutierrez-Mata

Velázquez-Martínez

Álvarez-Gallegos

et al. 2017

International Journal of Photoenergy

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This literature research, although not exhaustive, gives perspective to solar-driven photocatalysis, such as solar photo-Fenton and TiO 2 solar photocatalysis, reported in the literature for the degradation of aqueous organic pollutants. Parameters that influence the degradation and mineralization of organics like catalyst preparation, type and load of catalyst, catalyst phase, pH, applied potential, and type of organic pollutant are addressed. Such parameters may also affect the photoactivity of the catalysts used in the studied solar processes. Solar irradiation is a renewable, abundant, and pollution-free energy source for low-cost commercial applications. Therefore, these solar processes represent an environmentally friendly alternative mainly because the use of electricity can be decreased/avoided.

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Degradation of pesticides using hybrid processes based on cavitation and photocatalysis: A review

Bagal,

Nandgawle,

Thosar

et al. 2023

Environmental Quality Mgmt

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The production of pesticides and its subsequent consumption in agricultural fields have increased significantly also resulting in environmental concerns. The current review discusses the different aspects of two emerging techniques as cavitation and photocatalysis that can be effectively applied for the degradation of toxic pesticides. Governing mechanisms for the degradation have been presented followed by discussion on the effect of different parameters on the extent of degradation, also presenting guidelines for optimum selection. It has been also demonstrated that the obtained degradation can be synergistically intensified by using combined techniques with complimentary mechanisms. The discussion clearly revealed that cavitation and photocatalysis have great potential to degrade pesticides efficiently. Overall, it was demonstrated that combined technique under the optimized set of operating conditions is energy‐efficient, cost‐effective and promising technique for pesticide degradation.

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Sonophotocatalytic degradation of alazine and gesaprim commercial herbicides in TiO2 slurry

Cited by 53 publications

References 15 publications

Sonication Effects on Atrazine Dissipation in Vadose Zone Sediment Slurries

Sonication Effects on Atrazine Dissipation in Vadose Zone Sediment Slurries

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Degradation of pesticides using hybrid processes based on cavitation and photocatalysis: A review

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