Photocatalytic ozonation of 4-chloro-2-methylphenoxyacetic acid and its reaction intermediate 4-chloro-2-methyl phenol

Solís, Rafael R.; Rivas, Javier; Pérez‐Bote, José Luis; Gimeno, Olga

doi:10.1016/j.jtice.2014.09.010

Cited by 16 publications

(3 citation statements)

References 27 publications

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“…Liquid chromatography and analysis conditions were modified as described by Solís et al 31 . Briefly, an HPLC system (Shimadzu LC‐20A) equipped with a variable wavelength UV–visible detector was used for MCPA analysis.…”

Section: Methodsmentioning

confidence: 99%

Preparation of alginate–chitosan floating granules loaded with 2‐methyl‐4‐chlorophenoxy acetic acid (MCPA) and their bioactivity on water hyacinth

Hou

Yang

et al. 2021

Pest Management Science

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BACKGROUND Water hyacinth (Eichhornia crassipes) is considered the most damaging aquatic weed in many countries. Chemical methods are still the primary approach to control, although this directly exposes the natural enemy of water hyacinth (water hyacinth weevil) to herbicides. In addition, spray drift can easily damage non‐target plants. In this study, herbicides, natural polymer materials (chitosan and carboxymethyl chitosan), sodium alginate and natural oils (citronella oil) were used to prepare novel floating polysaccharide granules as a solution for controlling water hyacinth. RESULTS 2‐Methyl‐4‐chlorophenoxy acetic acid (MCPA) floating granules with a spherical structure were prepared using a MCPA–chitosan–sodium alginate–oil cross‐linking and embedding method. The granules produced showed the required properties of floatation and slow controlled herbicide release. In addition, the polysaccharide granules collected around water hyacinth plants and enabled targeted release of the active herbicide ingredients onto the stems and roots of the weed, thereby stopping the herbicide from reaching non‐target plants and preventing regrowth of water hyacinth. CONCLUSION We successfully prepared highly effective MCPA‐loaded floating granules, which compared with an MCPA solution, exerted greater control on water hyacinth. Concomitantly, these granules provide a solution to spray drift and ensure the safety of natural enemies of water hyacinth, which is of great significance in research on herbicide formulations.

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Section: Methodsmentioning

confidence: 99%

Preparation of alginate–chitosan floating granules loaded with 2‐methyl‐4‐chlorophenoxy acetic acid (MCPA) and their bioactivity on water hyacinth

Hou

Yang

et al. 2021

Pest Management Science

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“…When pH < pKa value, phenol forms as a neutral species (C 6 H 5 OH), whereas when pH > pKa, the phenoxide ion (C 6 H 5 O − ) is form [18]. During adsorption, the surface charge promotes interaction between the catalyst and pollutant [19]. In this study, the pH of 100 mL phenol solution is varied in three different ranges, which were pH4 (acidic), pH6 (weak acid) and pH8 (basic), with the initial phenol concentration and catalyst loading were fixed at 30 mg/L and 0.1 g, respectively.…”

Section: Effects Of Ph and Initial Phenol Solution Concentration On Tmentioning

confidence: 99%

Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

et al. 2018

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Focusing on the photocatalytic degradation of phenol under visible light, the synthesized lanthanum orthoferrites (LaFeO 3 ) by gel combustion method using citric acid as sacrificial agent were investigated. With the highest reaction temperature of 200 °C, the physicochemical properties of synthesized samples were characterized by X-Ray diffraction (XRD) analysis, Brunauer-Emmet-Teller (BET), and Energy Dispersive X-Ray spectroscopy (EDS). On the other hand, UV-Vis spectroscopy analysis was carried out to determine the phenol photodegradation activities and mechanism. The results suggested the well-defined LaFeO 3 nanocrystals with specific area of 28 m 2 g −1 were successfully synthesized. Besides that, variations in operating parameters such as pH, catalyst dosage and initial concentration of phenol in synthetic wastewater were also examined. In conclusion, LaFeO 3 nanocrystalline exhibited an exceptional photocatalytic activity for phenol degradation, thus providing a perfect alternative for pharmaceutical wastewater treatment.

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“…Ozone reacts with the conductive-band electron, thus preventing its return to the valence band, and forms ozonide radicals ( 3 •− ), an initial step towards the formation of more hydroxyl radicals in this system, shown by equations 8 and 9 [23,24,25]. The degradation efficiency of photocatalytic ozonation has been demonstrated in many lab-scale studies [26,27,28,29,30], but few of them have been performed on real wastewaters [31,32].…”

Section: Introductionmentioning

confidence: 99%

Performance and kinetic modelling of photolytic and photocatalytic ozonation for enhanced micropollutants removal in municipal wastewaters

Silva

Cruz-Alcalde

Sans

et al. 2019

Applied Catalysis B: Environmental

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In this work, the performances of ozonation, photolytic ozonation (UV-C/O3), and photocatalytic ozonation (UV-A/TiO2/O3) in degrading ozone recalcitrant micropollutants in four different real domestic wastewaters were evaluated in semicontinuous operation, together with the influence of water matrices in the ozone mass transfer and pollutant degradation rates. The •OH exposure per consumed ozone ratio, defined as ROH,O3, was applied for single ozonation and modified for light-assisted ozonation processes to evaluate and compare the contribution of radical pathway on micropollutants abatement for the different wastewaters studied. ROH,O3 plots presented good fitting (R 2 > 0.95) in two stages, corresponding to different ozone mass transfer regimes, for all cases. Light-assisted ozonation attained higher pollutant degradation for all water matrices compared to single ozonation, although the performance of UVassisted processes was more sensitive to matrix factors like composition and turbidity.Moreover, the improvement brought by both light-based processes on ROHO3 values mainly took place during the second stage. Thus, photocatalytic ozonation reached ROHO3 values higher than double for all wastewaters, compared with single ozonation (between 105% and 127% increase). These values represent a saving of almost half of the overall ozone needs (42%) for the same ozone recalcitrant micropollutant depletion, although it would require the adoption of higher ozone doses than the currently employed for ozonation in wastewater treatment plants.

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Photocatalytic ozonation of 4-chloro-2-methylphenoxyacetic acid and its reaction intermediate 4-chloro-2-methyl phenol

Cited by 16 publications

References 27 publications

Preparation of alginate–chitosan floating granules loaded with 2‐methyl‐4‐chlorophenoxy acetic acid (MCPA) and their bioactivity on water hyacinth

Preparation of alginate–chitosan floating granules loaded with 2‐methyl‐4‐chlorophenoxy acetic acid (MCPA) and their bioactivity on water hyacinth

Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

Performance and kinetic modelling of photolytic and photocatalytic ozonation for enhanced micropollutants removal in municipal wastewaters

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