Fate, eco-toxicological characteristics, and treatment processes applied to water polluted with glyphosate: A critical review

Villamar-Ayala, Cristina Alejandra; Carrera-Cevallos, Jeanette Verónica; Vásquez-Medrano, Rubén; Espinoza-Montero, Patricio J.

doi:10.1080/10643389.2019.1579627

Cited by 59 publications

(25 citation statements)

References 142 publications

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“…However, processes such as filtration using sand, ultrafiltration, reverse osmosis, adsorption by activated charcoal and biological degradation are expensive and require large infrastructure investments and some are specific to particular contaminants [7,8]. If the operating conditions are not controlled, biological processes can generate by-products, such as metabolites, characterized by potentially higher toxicity [9] Advanced oxidation processes (AOPs) are considered among the most promising processes for wastewater treatments containing pesticides. The advantages of these processes are related to the high percentage of degradation of organic pollutants [10][11][12][13] but also to the ability to produce hydrogen, promote CO 2 reduction, NO x reduction or ammonia synthesis, and to be environmentally friendly processes characterized by low energy consumption [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

W-Doped ZnO Photocatalyst for the Degradation of Glyphosate in Aqueous Solution

2021

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In this paper, the photocatalytic degradation of glyphosate by zinc oxide (ZnO) photocatalysts doped with tungsten (W) was investigated under solar simulated light. The photocatalysts were successfully synthesized through a simple precipitation method and subsequently characterized by different techniques: Raman spectroscopy, UV–Vis, N2 adsorption at −196 °C, X-ray diffraction, and SEM analysis. In particular, all the prepared catalysts were characterized by a crystallite size of about 28 nm and a hexagonal wurtzite structure. After the W doping, the bandgap energy decreased from 3.22 of pure ZnO to 3.19 for doped ZnO. This allowed us to obtain good results in terms of glyphosate degradation and simultaneous mineralization under solar simulated lamps, making the process environmentally friendly and with almost zero energy costs. In particular, the best photocatalytic performance was obtained with 100 W-ZnO (prepared with 1.5 mol % of W). With this catalyst, after 180 min of exposure to solar simulated light, the glyphosate degradation and mineralization was equal to 74% and 30%, respectively. Furthermore, it has been shown that the best catalyst dosage was equal to 1.5 g/L. The study on the influence of pH evidenced that the best photocatalytic performances are obtained at spontaneous (neutral) pH conditions. Finally, to determine the main reactive species in the glyphosate oxidation, the effects of different radical scavengers were tested. The results evidenced that the glyphosate oxidation mechanism seems to be related mainly to the O2•− generated under simulated solar light irradiation, but also in minor part to h+.

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Section: Introductionmentioning

confidence: 99%

W-Doped ZnO Photocatalyst for the Degradation of Glyphosate in Aqueous Solution

2021

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“…Its solubility in water is 1.01 g/100 mL (20 °C), with molar mass of 169.1 g mol −1 . At different pH, possible acid dissociate constants are as pK a1 = 2.32 (carboxylate), pK a2 = 5.86 (phosphonate), and pK a3 = 10.86 (amino), (Villamar-Ayala et al 2019;Mayakaduwa et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate adsorption by Eucalyptus camaldulensis bark-mediated char and optimization through response surface modeling

2019

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In this study, orthophosphoric acid-modified activated char was prepared from Eucalyptus camaldulensis bark (EBAC), and used for removing traces of [N-(phosphonomethyl)glycine] (glyphosate) herbicide from aqueous solution. The adsorption capacity was characterized by zero-point-charge pH, surface analysis, and Fourier transform infrared spectroscopy. Batch mode experiments were conducted to observe the effects of selected variables, namely dose, contact time, pH, temperature, and initial concentration, on adsorption capacity. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models were generated to describe the mechanisms involved in the multilayer adsorption process. The results show that high temperature enhanced the adsorption capacity of EBAC, with a temperature of 373 K yielding adsorption capacity (q max) and Freundlich parameter (K F) of 66.76 mg g −1 and 9.64 (mg g −1) (L mg −1) −n , respectively. The thermodynamics study revealed entropy and enthalpy of −5281.3 J mol −1 and −20.416 J mol −1 , respectively. Finally, glyphosate adsorption was optimized by the Box-Behnken model, and optimal conditions were recorded as initial concentration of 20.28 mg L −1 , pH 10.18, adsorbent dose of 199.92 mg/50 mL, temperature of 303.23 K, and contact time of 78.42 min, with removal efficiency of 98%. Therefore, it can be suggested that EBAC could be used as an efficient, low-cost adsorbent for removal of glyphosate from aqueous solutions.

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“…It is reported that under natural conditions and in waste treatment facilities, the main biodegradation pathway is AMPA's one. Sarcosine pathway is the main route observed under isolated conditions (Villamar-Ayala et al, 2019). In the AMPA and sarcosine pathways, C-P lyases have an important role (Sviridov et al, 2012;Tang et al, 2019).…”

Section: Biological Treatmentmentioning

confidence: 99%

“…Furthermore, after spreading, glyphosate-containing herbicides may contaminate the environment. Through spraying, glyphosate can directly enter the atmosphere environment, with concentrations in rain waters up to 0.48 g.L −1 (Villamar- Ayala et al, 2019). Then, glyphosate reaches the target organisms by foliar contact.…”

Section: Introductionmentioning

confidence: 99%

“…Several review papers have been published on the treatment technologies of glyphosate. Jönsson et al (2013) and Villamar-Ayala et al (2019) both reviewed the treatment of glyphosate through using physical treatment processes, biological treatment, and advanced oxidation processes (AOPs) and briefly compared their advantages and disadvantages. However, these review papers not summarised glyphosate degradation pathways.…”

Section: Introductionmentioning

confidence: 99%

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