Degradation of ciprofloxacin by photocatalytic ozonation process under irradiation with UVA: Comparative study, performance and mechanism

Asgari, Esrafil; Sheikhmohammadi, Amir; Nourmoradi, Heshmatollah; Nazari, Shahram; Aghanaghad, Mohammad

doi:10.1016/j.psep.2020.09.041

Cited by 72 publications

(24 citation statements)

References 54 publications

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“…Valério's team [31b] and Asgari's team [35] obtained a similar conclusion from the study of tetracycline and ciprofloxacin (CIP) degradation with TiO 2 photocatalysis and ozonation, respectively.…”

Section: Mechanism Of Ozonationmentioning

confidence: 77%

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

Luo

Xie

et al. 2020

ChemistrySelect

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Ozone is a strong gas oxidant and is often considered as an important source of atomic oxygen. It can not only sterilize but also decompose most organic components in water. In organic reactions, it can be used for carbon‐carbon double bond oxidation. Because ozone is unstable and easy to decompose, the oxidations usually need to be carried out in the presence of low temperature or catalysts to improve the ozone utilization. The adsorption mechanisms of ozone on the surface of solid catalysts are different due to the characteristics of the ozone molecule and the different reaction conditions. In this paper, the adsorption and reaction mechanisms of ozone on solid catalyst surface are reviewed: Firstly, the ozone has weak alkalinity similar to that of CO, but the distribution of electrons in the ozone molecule exists the difference. The difference in electron distribution makes ozone to be a dipole. The central oxygen atom can accept electrons as the Lewis acid, while the terminal oxygens are electron donors to be the Lewis base. Secondly, the functional groups, which have Lewis acid and base sites, such as hydroxyl groups, can be adsorbed with the central or terminal oxygen of ozone to form a surface complex. Last, the solvents also have a critical effect on the adsorption of ozone and subsequent oxidation. According to the above mechanisms, the design and preparation of ozonation catalysts are also proposed to improve the ozonation selectivity.

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Section: Mechanism Of Ozonationmentioning

confidence: 77%

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

Luo

Xie

et al. 2020

ChemistrySelect

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“…It can be observed that most active systems are (Ti) and (Ti-Ce-Sn) since their removal rate constant of paracetamol are 1.5 and 1.53 times, respectively, higher than that of the noncatalytic process. [24,[84][85][86][87][88][89][90]. In this study, from the reactions at small ozone concentration (6O 3 ), it can be observed that direct oxidation with ozone (Figure 14A) has low importance (Equations ( 6) and ( 7)), while at a higher ozone concentration (12O 3 ) and in the presence of UV radiation (Figure 14B), the radical production increases significantly (Equations ( 8)-( 10)).…”

Section: Ozone Consumptionmentioning

confidence: 59%

Removal of Paracetamol from Aqueous Solutions by Photocatalytic Ozonation over TiO2-MexOy Thin Films

Avramescu

Fierăscu

et al. 2022

Nanomaterials

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Analgesics and nonsteroidal anti-inflammatory drugs (NSAIDs) such as paracetamol, diclofenac, and ibuprofen are frequently encountered in surface and ground water, thereby posing a significant risk to aquatic ecosystems. Our study reports the catalytic performances of nanosystems TiO2 -MexOy (Me = Ce, Sn) prepared by the sol-gel method and deposited onto glass slides by a dip-coating approach in the removal of paracetamol from aqueous solutions by catalytic ozonation. The effect of catalyst type and operation parameters on oxidation efficiency was assessed. In addition to improving this process, the present work simplifies it by avoiding the difficult step of catalyst separation. It was found that the thin films were capable of removing all pollutants from target com-pounds to the oxidation products.

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“…3 d, the pseudo-first-order rate constant achieved the highest at pH 12 ( k = 0.3127 h −1 ) instead of pH 10 ( k = 0.2986 h −1 ). It is believed that at alkaline pH conditions, the indirect reaction between organic molecules and ·OH radicals improves the treatment efficiency (Asgari et al 2021 ). The lowest COD removal and decolourization efficiency of AnVE at low pH (pH 3) might be ascribed to the reaction between ZnO and the acids to form Zn 2+ (Eq.…”

Section: Resultsmentioning

confidence: 99%

“…4 b. The increment of catalyst dosage can promote the production of active radicals from a larger surface area (Asgari et al 2021 ). Thus, the larger surface area of the zinc oxide was excited by the abundant and active radicals when the catalyst dosage was increased, which ultimately improve the treatment efficiency (Chen et al 2011 ).…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the operational conditions of ZnO + UV and ZnO + UV + aeration showed excellent COD reduction efficiency (35.7% and 38.7%) and decolourization (91.4% and 92.9%), respectively in 5 h of UV irradiation. The photocatalytic process with the existence of UV and photocatalyst led to redox reactions, thus the electron–hole pairs were created and produced hydroxyl radicals (Asgari et al 2021 ). These findings indicated that the production of hydroxyl radicals can only be successful with the presence of UV radiation and photocatalyst (Moussavi et al 2014 ).…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic Degradation of Sugarcane Vinasse Using ZnO Photocatalyst: Operating Parameters, Kinetic Studies, Phytotoxicity Assessments, and Reusability

et al. 2021

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Photocatalytic degradation performance is highly related to optimized operating parameters such as initial concentration, pH value, and catalyst dosage. In this study, the impact of various parameters on the photocatalytic degradation of anaerobically digested vinasse (AnVE) has been determined through decolourization and chemical oxygen demand (COD) reduction efficiency using zinc oxide (ZnO) photocatalyst. In this context, the application of photocatalytic degradation in treating sugarcane vinasse using ZnO is yet to be explored. The COD reduction efficiency and decolourization achieved 83.40% and 99.29%, respectively, under the conditions of 250 mg/L initial COD concentration, pH 10, and 2.0 g/L catalyst dosage. The phytotoxicity assessment was also conducted to determine the toxicity of AnVE before and after treatment using mung bean ( Vigna radiata ). The reduction of root length and the weight of mung bean indicated that the sugarcane vinasse contains enormous amounts of organic substances that affect the plant's growth. The toxicity reduction in the AnVE solution can be proved by UV–Vis absorption spectra. Furthermore, the catalyst recovery achieved 93% in the reusability test. However, the COD reduction efficiency and decolourization were reduced every cycle. It was due to the depletion of the active sites in the catalyst with the adsorption of organic molecules. Thus, it can be concluded that the photocatalytic degradation in the treatment of AnVE was effective in organic degradation, decolorization, toxicity reduction and can be reused after the recovery process. Graphical abstract

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Degradation of ciprofloxacin by photocatalytic ozonation process under irradiation with UVA: Comparative study, performance and mechanism

Cited by 72 publications

References 54 publications

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

Removal of Paracetamol from Aqueous Solutions by Photocatalytic Ozonation over TiO2-MexOy Thin Films

Photocatalytic Degradation of Sugarcane Vinasse Using ZnO Photocatalyst: Operating Parameters, Kinetic Studies, Phytotoxicity Assessments, and Reusability

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