Photocatalyst production from wasted sediment and quality improvement with titanium dioxide to remove cephalexin in the presence of hydrogen peroxide and ultrasonic waves: A cost-effective technique

Tavasol, Fatemeh; Tabatabaie, Tayebeh; Ramavandi, Bahman; Amiri, Fazel

doi:10.1016/j.chemosphere.2021.131337

Cited by 16 publications

(4 citation statements)

References 63 publications

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“…The extent of electron (e -)/ hole (h + ) separation and its recombination play a remarkable role in terms of photodegradation efficacy and on the nano-photocatalyst, which is lacking in the literature for co-non-metal doped photocatalysts. Tavasol (2021) reported that the percentage removal of cephalexin drug from urban water and hospital wastewater in the presence of activated carbon doped TiO2 nanoparticles were 76% and 63%, respectively, and its decomposition showed the 1 st -order kinetics (k > 0.01 min -1 ) [21]. The novelty of AC-doped TiO2 is considered to increase the adsorption of pollutants on the catalyst's surface.…”

Section: Introductionmentioning

confidence: 99%

Reactive oxygen species aided photocatalytic degradation of tetracycline using non-metal activated carbon doped TiO2 nanocomposite under UV-light irradiation

Patidar,

Dugyala,

Chakma

et al. 2024

Res Chem Intermed

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The degradation of an antibiotic drug was investigated by low-cost nanocomposite material.The visible light responsive non-metal activated carbon (AC) doped TiO2 nanocomposite (AC/TiO2 NC) photocatalyst with wide band gap energy was synthesized via the coprecipitation method with an equal mass ratio of AC and TiO2. Under optimal conditions, the photocatalytic experiment was carried out in a batch reactor in the presence of irradiation of 15W UV light. A significant effect of AC caused a notable reduction in the optical band gap of doped with TiO2. The composite AC/TiO2 showed the maximum removal of 87.6% TCL drug in 45 min. The optimal catalyst dose and drug concentration were found to be 1.25 g and 100 mg/L, respectively, but the optimal reaction time, 45 min, and pH = 6.5 are very significant in presence of UV light. The kinetic experimental data showed the best fitting for both pseudofirst-order (ka = 21.83 min -1 ) and pseudo-second-order (0.23 g/g.min) models with a high accuracy based on R 2 values. Freundlich model showed a maximum adsorption capacity (qm) of 94.87 (mg/g) for TCL drug removal on the heterogeneous surface with high accuracy (R 2 = 0.999) than the Langmuir model. Adsorption followed by degradation was shown at optimized pH while intraparticle diffusion phenomena acts as the rate-limiting step. Moreover, a proposed drug degradation mechanism based on the formation of HO . radical is suggested and LC-MS analysis identified fourteen intermediate products during TLC degradation. While the antibacterial activity test showed that the generated degradation products were less toxic compared to the TCL molecule.

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Section: Introductionmentioning

confidence: 99%

Reactive oxygen species aided photocatalytic degradation of tetracycline using non-metal activated carbon doped TiO2 nanocomposite under UV-light irradiation

Patidar,

Dugyala,

Chakma

et al. 2024

Res Chem Intermed

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“…Cephalexin (CPX, C 16 H 17 N 3 O 4 S, Figure 1) is a beta-lactam cephalosporin antibiotic commonly prescribed for the treatment of skin and soft tissue infections, and uncomplicated urinary tract infections, among others (Everts et al 2021). Its wide range of bacterial activity and high solubility in water make it one of the most prescribed antibiotics worldwide (Tavasol et al 2021). However, the chemical structure and antibacterial nature of CPX limit the use of conventional treatments for its elimination from water (Yu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…However, the chemical structure and antibacterial nature of CPX limit the use of conventional treatments for its elimination from water (Yu et al 2021). In this way, CPX concentrations of up to 64 μg L À1 have been reported in wastewater (Gou et al 2021), and its presence in seawater samples and in coastal sediments has also been informed, which implies that it is necessary to implement new alternatives in the treatment of water containing this antibiotic (Tavasol et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Different methods have been used to remove CPX from aqueous solutions including adsorption, ozonation, photo-catalysis, Fenton and related reactions, and catalytic wet peroxide oxidation (Cárdenas Sierra et al 2020;Tavasol et al 2020Tavasol et al , 2021Basturk et al 2021;Gou et al 2021;Yu et al 2021). However, much information regarding the use of activated persulfate on CPX elimination is not yet reported.…”

Section: Introductionmentioning

confidence: 99%

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Cephalexin removal by persulfate activation using simulated sunlight and ferrous ions

Perdomo

Minota

Zúñiga-Benítez

et al. 2021

Water Science and Technology

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This study presents the main results related to the use of activated persulfate (PS) in the elimination of the beta-lactam antibiotic cephalexin (CPX). Experiments were done using K2S2O8 and simulated sunlight. A face-centered central composite experimental design was used to analyze the effects of the solution pH and the PS concentration on the reaction, and to determine the optimized conditions that favor the CPX elimination. The results indicated that the removal of CPX is promoted by an acidic pH and under the higher evaluated PS dose (7.5 mg L−1). CPX total removal was achieved in 30 min. The analysis of the effect of the pollutant initial concentration indicated that a pseudo-first order kinetic model can be used to describe the reaction. Likewise, the use of Fe2+ ions for PS activation (in the dark) was evaluated and allowed to establish that a higher concentration of ions favors the pollutant removal. Control tests and under the presence of scavenger agents indicated that both HO• and SO4−• radicals would be present in the solution and promote the CPX elimination. The assessment of the solution dissolved organic carbon, nitrates and sulfates was also carried out, and indicated that a portion of the organic matter was mineralized.

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High-density amine-functionalized MCM-41 derived from pumice: facile synthesis and antibiotic adsorption

Zarrabi

2023

Polym. Bull.

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Photocatalyst production from wasted sediment and quality improvement with titanium dioxide to remove cephalexin in the presence of hydrogen peroxide and ultrasonic waves: A cost-effective technique

Cited by 16 publications

References 63 publications

Reactive oxygen species aided photocatalytic degradation of tetracycline using non-metal activated carbon doped TiO2 nanocomposite under UV-light irradiation

Reactive oxygen species aided photocatalytic degradation of tetracycline using non-metal activated carbon doped TiO2 nanocomposite under UV-light irradiation

Cephalexin removal by persulfate activation using simulated sunlight and ferrous ions

High-density amine-functionalized MCM-41 derived from pumice: facile synthesis and antibiotic adsorption

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