Photodegradation of chlorbromuron, atrazine, and alachlor in aqueous systems under solar irradiation

Bahena, Cristina Lizama; Martı́nez, Susana Silva

doi:10.1155/ijp/2006/81808

Cited by 18 publications

(7 citation statements)

References 20 publications

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“…The efficiency of TiO 2 photocatalytic processes can be improved by the addition of chemical oxidants, such as hydrogen peroxide and peroxodisulfate [ 50 , 56 ]. Peroxodisulfate seems to be a more efficient oxidant that H 2 O 2 .…”

Section: Overcoming the Detrimental Effects Of The Simultaneous Prmentioning

confidence: 99%

Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants

Tsydenova

Batoev

Батоева

2015

IJERPH

118

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The review explores the feasibility of simultaneous removal of pathogens and chemical pollutants by solar-enhanced advanced oxidation processes (AOPs). The AOPs are based on in-situ generation of reactive oxygen species (ROS), most notably hydroxyl radicals •OH, that are capable of destroying both pollutant molecules and pathogen cells. The review presents evidence of simultaneous removal of pathogens and chemical pollutants by photocatalytic processes, namely TiO2 photocatalysis and photo-Fenton. Complex water matrices with high loads of pathogens and chemical pollutants negatively affect the efficiency of disinfection and pollutant removal. This is due to competition between chemical substances and pathogens for generated ROS. Other possible negative effects include light screening, competitive photon absorption, adsorption on the catalyst surface (thereby inhibiting its photocatalytic activity), etc. Besides, some matrix components may serve as nutrients for pathogens, thus hindering the disinfection process. Each type of water/wastewater would require a tailor-made approach and the variables that were shown to influence the processes—catalyst/oxidant concentrations, incident radiation flux, and pH—need to be adjusted in order to achieve the required degree of pollutant and pathogen removal. Overall, the solar-enhanced AOPs hold promise as an environmentally-friendly way to substitute or supplement conventional water/wastewater treatment, particularly in areas without access to centralized drinking water or sewage/wastewater treatment facilities.

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Section: Overcoming the Detrimental Effects Of The Simultaneous Prmentioning

confidence: 99%

Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants

Tsydenova

Batoev

Батоева

2015

IJERPH

118

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“…Among several available treatment methods the advanced oxidation processes (AOPs) are the most promising alternative to treat herbicide wastes because they involve the generation of hydroxyl radicals (·OH) that are species nonselective and highly reactive oxidants. Ozonation [9,10], photolysis and photocatalysis [11,12], photo-Fenton degradation [13] of alachlor in water have been reported. Sonochemical degradation of alachlor [14] and the effect of ultrasonic frequency on the sonolysis of alachlor [15] were also investigated.…”

Section: Introductionmentioning

confidence: 99%

Degradation of alachlor in aqueous solution by using hydrodynamic cavitation

Wang¹,

Zhang²

2009

Journal of Hazardous Materials

175

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“…It could explain the measure of alachlor under limit of quantification in the aqueous phase within our bioreactors. Other mechanisms could be involved in the disappearance of alachlor including photodegradation (Bahena and Martínez 2006), adsorption (on the biofilm or reactor matter), and volatilization mechanisms (Chesters et al 1989). The observation of concentration-dependent effects (1 and 10 μg L−1), despite of the absence of alachlor measured at the bioreactor effluent, could suggest an adsorption on the colonization strips (made of polycarbonate) of biofilms.…”

Section: Discussionmentioning

confidence: 99%

Comparative responses of river biofilms at the community level to common organic solvent and herbicide exposure

Paule

Roubeix

Swerhone

et al. 2015

Environ Sci Pollut Res

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Residual pesticides applied to crops migrate from agricultural lands to surface and ground waters. River biofilms are the first aquatic non-target organisms which interact with pesticides. Therefore, ecotoxicological experiments were performed at laboratory scale under controlled conditions to investigate the community-level responses of river biofilms to a chloroacetanilide herbicide (alachlor) and organic solvent (methanol) exposure through the development referenced to control. Triplicate rotating annular bioreactors, inoculated with river water, were used to cultivate river biofilms under the influence of 1 and 10 μg L(-1) of alachlor and 25 mg L(-1) of methanol. For this purpose, functional (thymidine incorporation and carbon utilization spectra) and structural responses of microbial communities were assessed after 5 weeks of development. Structural aspects included biomass (chlorophyll a, confocal laser scanning microscopy) and composition (fluor-conjugated lectin binding, molecular fingerprinting, and diatom species composition). The addition of alachlor resulted in a significant reduction of bacterial biomass at 1 μg L(-1), whereas at 10 μg L(-1), it induced a significant reduction of exopolymer lectin binding, algal, bacterial, and cyanobacterial biomass. However, there were no changes in biofilm thickness or thymidine incorporation. No significant difference between the bacterial community structures of control and alachlor-treated biofilms was revealed by terminal restriction fragment length polymorphism (T-RFLP) analyses. However, the methanol-treated bacterial communities appeared different from control and alachlor-treated communities. Moreover, methanol treatment resulted in an increase of bacterial biomass and thymidine incorporation as well. Changes in dominant lectin binding suggested changes in the exopolymeric substances and community composition. Chlorophyll a and cyanobacterial biomass were also altered by methanol. This study suggested that the concentration-dependent effect of alachlor mainly remains limited to biomass and growth inhibition without apparent changes of structural and functional characteristics measured. Our work also establishes the potential toxic effects of organic solvents on river biofilm in ecotoxicological experiments. For the ecotoxicological experiments, the alternative of dissolution in organic solvent followed by its evaporation, depositing the chemical on a glass surface prior to dissolution in river water used here, appears to allow exposure while minimizing the effect of organic solvent.

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Photodegradation of chlorbromuron, atrazine, and alachlor in aqueous systems under solar irradiation

Cited by 18 publications

References 20 publications

Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants

Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants

Degradation of alachlor in aqueous solution by using hydrodynamic cavitation

Comparative responses of river biofilms at the community level to common organic solvent and herbicide exposure

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