Photocatalytic degradation of organic micropollutants: Inhibition mechanisms by different fractions of natural organic matter

Awfa, Dion; Ateia, Mohamed; Fujii, Manabu; Yoshimura, Chihiro

doi:10.1016/j.watres.2020.115643

Cited by 111 publications

(39 citation statements)

References 60 publications

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“…A study reported that the dissolved or matter in the excitation state act as a photosensitizer, enhancing phototransformat pesticides in addition; it may act as an antioxidant decreasing phototransformation through various mechanisms [52]. Inhibition mechanisms by natural organic matter also reported in another study [53].…”

Section: Resultsmentioning

confidence: 88%

“…Therefore, it is expected that the organic matter in water samples can be affected the radiation by absorbing the UV light to be excited and entering in series of reactions [48][49][50][51]. Despite the fact that this matter might be good for our experiment because most of pesticide residues is adsorbed or absorbed in the organic part in the targeted wastewater samples, an inhibitory effect of them on the photodegradation process is also possible [52,53]. A study reported that the dissolved organic matter in the excitation state act as a photosensitizer, enhancing phototransformation of pesticides in addition; it may act as an antioxidant decreasing phototransformation rates through various mechanisms [52].…”

Section: Resultsmentioning

confidence: 99%

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Impact of Photolysis and TiO2 on Pesticides Degradation in Wastewater

EL-Saeid

Alotaibi

Alshabanat

et al. 2021

Water

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Pesticide residues are harmful to the environment and human and animal health even at low levels because of long-term bioaccumulation. In this study, photolysis was applied to treat three representative water samples: aqueous atrazine and dimethoate solutions as target pesticides, as well as wastewater and agriculture wastewater containing pesticide residue. It was performed using ultraviolet (UV) irradiation at two wavelengths (254 and 306 nm) with exposure times ranging from 2 to 12 h in the presence and absence of a photocatalyst to identify the optimal degradation conditions. Extraction and analyzation process were performed by the Quick Easy Cheap Effective Rugged Safe (QuEChERS) methods and gas chromatography–tandem mass spectrometry with triple quadrupole detector (GC–MSMS/TQD), respectively. Photodegradation increased with an increase in exposure time and the TiO2 catalyst was beneficial for degradation. Both selected irradiation wavelengths were effective, although the wavelength of λ = 306 nm was the most efficient.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Impact of Photolysis and TiO2 on Pesticides Degradation in Wastewater

EL-Saeid

Alotaibi

Alshabanat

et al. 2021

Water

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“…Regarding effective sizes of sy tem variables, LF is expected to be adsorbed on E. coli cells through electrostatic intera tions, whereas NOM analogues would have a tendency to be adsorbed onto LF, whic was already adsorbed on bacterial cells. Consequently, the reduction in the surface cove age of LF particles could be attributed to occupying available sites of LF by E. coli cell therefore reducing the interactions between active sites of the LF catalyst and NOM com pounds [26,27]. Insignificant absorbance values for λ > 400 nm indicated the absence of chromophoric groups (color-forming moieties) related to the presence of systems including conjugated double bonds, aromatic rings, and phenolic functional groups containing atoms with lone pairs of electrons.…”

Section: Ternary Interactions Prevailing Between E Coli Nom Analogue Compounds and Lfmentioning

confidence: 99%

Photocatalytic Bactericidal Performance of LaFeO3 under Solar Light in the Presence of Natural Organic Matter: Spectroscopic and Mechanistic Evaluation

Lale

Pelosato

Türkten

et al. 2021

Water

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Solar photocatalytic inactivation (SPCI) of E. coli as the indicator microorganism using LaFeO3 (LF) has already been investigated under various experimental conditions, excluding any role of natural organic matter (NOM). However, comprehensive information about the behavior of E. coli and its inactivation mechanism in the presence of NOM, as well as the behavior of NOM components via solar photocatalysis using LF as a photocatalyst, has prime importance in understanding real natural water environments. Therefore, in this study, further assessment was devoted to explore the influence of various NOM representatives on the SPCI of E. coli by using LF as a novel non-TiO2 photocatalyst. The influence of NOM as well as its sub-components, such as humic acids (HA) and fulvic acids (FA), was also investigated to understand different NOM-related constituents of real natural water conditions. In addition to spectroscopic and mechanistic investigations of cell-derived organics, excitation emission matrix (EEM) fluorescence spectra with parallel factor multiway analysis (PARAFAC) modeling revealed further information about the occurrence and/or disappearance of NOM-related and bacteria-related fluorophores upon LF SPCI. Both the kinetics as well as the mechanism of the LF SPCI of E. coli in the presence of NOM compounds displayed substrate-specific variations under all conditions.

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“…Awfa et al examined the degradation of carbamazepine by a composite of carbon nanotubes (CNTs) and TiO2 in two-stages treated domestic wastewater, river water, and three commercial synthetic natural organic matter (NOM) solutions, viz., Suwannee River humic acid (SRHA), Suwannee River reverse-osmosis isolates (SRNOM), and Suwannee River fulvic acid (SRFA) [29]. The degradation of carbamazepine was reduced from 93% in ultra-pure water to 87% and 40% in river water and treated wastewater, respectively.…”

Section: Presence Of Interfering Species and Real Water Matricesmentioning

confidence: 99%

“…NOM can inhibit the photocatalytic degradation of micropollutants by different concurrent mechanisms according to the nature and concentration of existing organic substances. Firstly, the photocatalytic activity could be reduced by the inner filter effect, i.e., a lower effective irradiation of the photocatalyst, due to light absorption by organic compounds [29]. This effect is greatly dependent on the molecular structure of NOM, as complex organic structures absorb light on a broader range than simple organics and secondary by-products [67].…”

Section: Presence Of Interfering Species and Real Water Matricesmentioning

confidence: 99%

Towards Scaling-up Photocatalytic Process for Multiphase Environmental Applications: A Review

Mg¹,

Djellabi²,

Meroni³

et al. 2021

Preprint

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Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research-practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.

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Photocatalytic degradation of organic micropollutants: Inhibition mechanisms by different fractions of natural organic matter

Cited by 111 publications

References 60 publications

Impact of Photolysis and TiO2 on Pesticides Degradation in Wastewater

Impact of Photolysis and TiO2 on Pesticides Degradation in Wastewater

Photocatalytic Bactericidal Performance of LaFeO3 under Solar Light in the Presence of Natural Organic Matter: Spectroscopic and Mechanistic Evaluation

Towards Scaling-up Photocatalytic Process for Multiphase Environmental Applications: A Review

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