Photo-degradation of dexamethasone phosphate using UV/Iodide process: Kinetics, intermediates, and transformation pathways

Rasolevandi, Tayebeh; Naseri, Simin; Azarpira, Hossein; Mahvi, Amir Hossein

doi:10.1016/j.molliq.2019.111703

Cited by 49 publications

(14 citation statements)

References 35 publications

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“…According to the authors, the DXM photodegradation is initiated by the attack of methylene groups by OH • radicals generated by the photocatalyst, leading to the formation of ketone group due to the mineralization of carbon atoms. Radicals attacks also attacked the ring double bonds, causing the release of water molecules and CO 2 (Rasolevandi et al 2019).…”

Section: Pharmaceutical Compoundsmentioning

confidence: 99%

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Chakhtouna

Benzeid

Zari

et al. 2021

Environ Sci Pollut Res

249

111

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For many decades, titanium dioxide (TiO 2 ) semiconductor has been extensively applied in several environmental applications due to its higher photocatalytic performances toward different organic pollutants, pharmaceutical compounds, and bacteria. However, its shortfall response to visible light, and the expeditious recombination rate of the photogenerated electron-hole pairs, hampers its utilization. Doping TiO 2 semiconductor with silver nanoparticles is a sound strategy to (1) extend its photocatalytic activity to visible light, (2) prevent the electron/holes pairs recombination due to the formation of the Schottky barrier at the interfaces with TiO 2 that act as an electron-trapping center, and (3) enhance its bactericide performances. This review focuses on the recent progress on silver-doped titanium dioxide (Ag/TiO 2 )-based photocatalysts. It addresses a wide range of Ag/TiO 2 synthesis techniques, their physicochemical properties and discusses thoroughly the important role of silver (Ag) nanoparticles in enhancing the removal capacity and antibacterial performances of the Ag/TiO 2 photocatalysts.

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Section: Pharmaceutical Compoundsmentioning

confidence: 99%

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Chakhtouna

Benzeid

Zari

et al. 2021

Environ Sci Pollut Res

249

111

View full text Add to dashboard Cite

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“…Sometimes others minerals also released during mineralization of compounds such as sulphate, ammonia, sulphite, fluoride, sulphide, chloride, phosphate, nitrite, etc. [76]. Generally, the rate of mineralization is less as compared to degradation, probably due to generation of stable intermediate during process.…”

Section: Photocatalytic Degradation and Mineralization Pathwaymentioning

confidence: 99%

Role of Nanomaterials in the Treatment of Wastewater: A Review

Yaqoob

Parveen

Umar

et al. 2020

Water

523

160

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Water is an essential part of life and its availability is important for all living creatures. On the other side, the world is suffering from a major problem of drinking water. There are several gases, microorganisms and other toxins (chemicals and heavy metals) added into water during rain, flowing water, etc. which is responsible for water pollution. This review article describes various applications of nanomaterial in removing different types of impurities from polluted water. There are various kinds of nanomaterials, which carried huge potential to treat polluted water (containing metal toxin substance, different organic and inorganic impurities) very effectively due to their unique properties like greater surface area, able to work at low concentration, etc. The nanostructured catalytic membranes, nanosorbents and nanophotocatalyst based approaches to remove pollutants from wastewater are eco-friendly and efficient, but they require more energy, more investment in order to purify the wastewater. There are many challenges and issues of wastewater treatment. Some precautions are also required to keep away from ecological and health issues. New modern equipment for wastewater treatment should be flexible, low cost and efficient for the commercialization purpose.

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“…The continuous increase of consumption of pharmaceuticals and their subsequent release into the aqueous environment leads to severe environmental problems. Dexamethasone (DEX), an anti‐inflammatory drug, is one of the most commonly used glucocorticoids for the treatment of many conditions, including rheumatic problems, a number of skin diseases, severe allergies, asthma and nausea 1,2 . Dexamethasone is a derivative of cortisol, a steroid hormone included in the glucocorticoid class of hormones 3 .…”

Section: Introductionmentioning

confidence: 99%

Degradation of dexamethasone in water using BDD anodic oxidation and persulfate: reaction kinetics and pathways

Grilla

Taheri

Miserli

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND The presence of micro‐pollutants in conventional wastewater treatment plants raises environmental concerns due to their insufficient removal. Non‐biological methods are needed to treat such compounds and this work demonstrates the use of electrochemical oxidation for the degradation of the drug dexamethasone (DEX). RESULTS A cell consisting of a boron‐doped diamond anode and a stainless steel or carbon cloth cathode was employed, with Na2SO4 being the electrolyte. DEX degradation rate, at the low level of mg L−1 (0.25–2 mg L−1), increases with increasing current (0.02–0.2 A m−2), as well as in the presence of sodium persulfate (50–250 mg L−1); the latter is electrochemically activated to produce additional oxidants and enhances degradation in a synergistic way. A rate constant of 0.194 min−1 was recorded for 0.5 mg L−1 DEX degradation at 0.2 A m−2 with 150 mg L−1 persulfate. The water matrix had little effect on performance compared to experiments in pure water; the only exception was the presence of chloride (50–250 mg L−1), which substantially improved rates due to the formation of active chlorine species (up to about five times). Carbon cloth accelerated DEX removal by up to three times compared to stainless steel and this was partly due to its adsorptive capacity; similarly, reactions involving DEX transformation products (TPs) also occurred faster. Seven TPs were identified and profiles were followed; reaction pathways involve hydroxylation, oxidation, decarboxylation and ring‐opening reactions, followed by fluorine release in the liquid phase. CONCLUSION A hybrid technology based on electrochemical oxidation and persulfate activation is proposed for the treatment of residual pharmaceuticals in environmental matrices. © 2021 Society of Chemical Industry (SCI).

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Photo-degradation of dexamethasone phosphate using UV/Iodide process: Kinetics, intermediates, and transformation pathways

Cited by 49 publications

References 35 publications

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Role of Nanomaterials in the Treatment of Wastewater: A Review

Degradation of dexamethasone in water using BDD anodic oxidation and persulfate: reaction kinetics and pathways

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