An investigation of the role of pH in the rapid photocatalytic degradation of MCPA and its primary intermediate by low-power UV LED irradiation

Kelly, Jamie; Morrison, Gary; Skillen, Nathan; Robertson, Peter K. J.

doi:10.1016/j.cej.2018.11.142

Cited by 24 publications

(10 citation statements)

References 27 publications

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“…These compounds and their metabolites are found to endanger human health as well as destroy aquatic animals [ 2 ]. Evidence from previous studies have shown that agrochemicals such as 4-chloro-2-methylphenoxyacetic acid (MCPA) have immensely contributed to water pollution through agricultural runoff, direct spray and leaching [ 3 , 4 ]. MCPA is among the most extensively used herbicides that have been applied to selectively control weeds in farmlands, roads and gardens [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Removal of 4-chloro-2-methylphenoxyacetic acid from water by MIL-101(Cr) metal-organic framework: kinetics, isotherms and statistical models

et al. 2021

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Effective removal of 4-chloro-2-methylphenoxyacetic acid (MCPA), an emerging agrochemical contaminant in water with carcinogenic and mutagenic health effects has been reported using hydrothermally synthesized MIL-101(Cr) metal-organic framework (MOF). The properties of the MOF were ascertained using powdered X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and surface area and porosimetry (SAP). The BET surface area and pore volume of the MOF were 1439 m 2 g −1 and 0.77 cm 3 g −1 , respectively. Artificial neural network (ANN) model was significantly employed for the accurate prediction of the experimental adsorption capacity ( q e ) values with minimal error. A rapid removal of the pollutant (99%) was recorded within short time (approx. 25 min), and the reusability of the MOF (20 mg) was achieved up to six cycles with over 90% removal efficiency. The kinetics, isotherm and thermodynamics of the process were described by the pseudo-second-order, Freundlich and endothermic adsorption, respectively. The adsorption process is spontaneous based on the negative Gibbs free energy values. The significant correlation between the experimental findings and simulation results suggests the great potential of MIL-101(Cr) for the remediation of MCPA from water matrices.

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Section: Introductionmentioning

confidence: 99%

Removal of 4-chloro-2-methylphenoxyacetic acid from water by MIL-101(Cr) metal-organic framework: kinetics, isotherms and statistical models

et al. 2021

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“…The efficiency of phenoxy acid phototransformation can be enhanced through exposure to UV radiation in combination with H 2 O 2 (Shu et al 2013;Martinez et al 2016;Semitsoglou-Tsiapou et al 2016;Adak et al 2019). Hydrogen peroxide is photolysed under exposure to UV light in an acidic environment, which leads to the generation of hydroxyl radicals ( · OH) with high oxidation potential (Klamerth et al 2012). Xenon-doped mercury lamps are usually used in the UV/H 2 O 2 process.…”

Section: Fe(oh) 3 and Other Insoluble Iron Species Can Bementioning

confidence: 99%

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Muszyński

Brodowska

Paszko

2019

Environ Sci Pollut Res

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The article presents the behavior of phenoxy acids in water, the levels in aquatic ecosystems, and their transformations in the water environment. Phenoxy acids are highly soluble in water and weakly absorbed in soil. These highly mobile compounds are readily transported to surface and groundwater. Monitoring studies conducted in Europe and in other parts of the world indicate that the predominant phenoxy acids in the aquatic environment are mecoprop, 4-chloro-2-methylphenoxyacetic acid (MCPA), dichlorprop, 2,4-dichlorophenoxyacetic acid (2,4-D), and their metabolites which are chlorophenol derivatives. In water, the concentrations of phenoxy acids are effectively lowered by hydrolysis, biodegradation, and photodegradation, and a key role is played by microbial decomposition. This process is determined by the qualitative and quantitative composition of microorganisms, oxygen levels in water, and the properties and concentrations of phenoxy acids. In shallow and highly insolated waters, phenoxy acids can be decomposed mainly by photodegradation whose efficiency is determined by the form of the degraded compound. Numerous studies are underway on the use of advanced oxidation processes (AOPs) to remove phenoxy acids. The efficiency of phenoxy acid degradation using AOPs varies depending on the choice of oxidizing system and the conditions optimizing the oxidation process. Most often, methods combining UV radiation with other reagents are used to oxidize phenoxy acids. It has been found that this solution is more effective compared with the oxidation process carried out using only UV.

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“…This has put a significant strain on waste-water and drinking water treatment plants that need to achieve rapid and efficient removal of pollutants such as MCPA, which can often not be achieved with traditional methods such as commercial activated carbon filters (Derylo-Marczewska et al, 2010;Gimeno et al, 2003;Macaulay, n.d.;Taylor & WATER), 2016). Advanced Oxidation Processes (AOPs) such as photocatalysis present an environmentally benign and low energy alternative to deal with the issue (Bethi et al, 2016;Boczkaj & Fernandes, 2017;Byrne et al, 2017;Kelly et al, 2019). Upon absorption of photons, photocatalysts can generate powerful radicals (OH• and O 2…”

Section: Introductionmentioning

confidence: 99%

“…Previously, we reported on the impact of adjusting the pH on photocatalytic MCPA degradation with a view towards revealing the mechanism at the catalyst surface (Kelly et al, 2019). It was shown that in aqueous suspensions of TiO 2 (pH=6.2), the negatively charged pollutant (pKa=3.73) is electrostatically attracted to positively charged catalyst surfaces.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation of 2-methyl-4-chlorophenoxyacetic acid (MCPA) by the addition of H2O2

et al. 2021

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An investigation of the role of pH in the rapid photocatalytic degradation of MCPA and its primary intermediate by low-power UV LED irradiation

Abstract: An investigation of the role of pH in the rapid photocatalytic degradation of MCPA and its primary intermediate by low-power UV LED irradiation.

Cited by 24 publications

References 27 publications

Removal of 4-chloro-2-methylphenoxyacetic acid from water by MIL-101(Cr) metal-organic framework: kinetics, isotherms and statistical models

Removal of 4-chloro-2-methylphenoxyacetic acid from water by MIL-101(Cr) metal-organic framework: kinetics, isotherms and statistical models

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Enhanced photocatalytic degradation of 2-methyl-4-chlorophenoxyacetic acid (MCPA) by the addition of H2O2

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