Modified diatomites for Fenton-like oxidation of phenol

Inchaurrondo, Natalia; Ramos, Cinthia Paula; Žerjav, Gregor; Font, Josep; Pintar, Albin; Haure, Patricia M.

doi:10.1016/j.micromeso.2016.10.026

Cited by 28 publications

(13 citation statements)

References 48 publications

(34 reference statements)

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“…US Environmental Protection Agency (USEPA) places them within the list of priority pollutants and has determined that 2,4,6-trichlorophenol is a probable carcinogen [15][16][17]. e technologies that have been implemented for the elimination of phenolic contaminants present in water are classified mainly into two large groups: those that separate the contaminant, such as adsorption, extraction, distillation, and ultrafiltration with membranes, and those that degrade the contaminant, for example, supercritical oxidation, moist air treatment, thermal treatment, biodegradation, and catalytic degradation [18][19][20][21][22][23][24][25]. In recent years, the processes of advanced oxidation using photocatalysts have generated great expectations as effective and effective methods for the elimination of emerging contaminants.…”

Section: Introductionmentioning

confidence: 99%

Activated Hydrotalcites Obtained by Coprecipitation as Photocatalysts for the Degradation of 2,4,6-Trichlorophenol

Ramos-Ramírez

Ortega

Tzompantzi

et al. 2018

Advances in Materials Science and Engineering

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A gallery of hydrotalcite-type mesoporous materials with different Mg/Al molar ratios were synthesized by the coprecipitation method. The materials were activated by heat treatment to test their activity in the photodegradation of 2,4,6-trichlorophenol under UV light irradiation. The physicochemical properties of the different synthesized and activated materials were determined using XRD, physical adsorption/desorption of N2, FTIR, SEM, DTA, and TGA. Their banned band energy was determined by UV-Vis to identify their potential to be used as a semiconductor in catalytic photodegradation processes. The results of photodegradation tests of 2,4,6-trichlorophenol showed that hydrotalcites have a high degradation capacity, up to 100% for the catalyst of Mg/Al ratio = 2, with a high mineralization capacity of 80%. The degradation capacity of most of the catalysts tested is mainly due to the presence of holes and the formation of superoxide free radicals, which are the determining species within the degradation mechanism.

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Section: Introductionmentioning

confidence: 99%

Activated Hydrotalcites Obtained by Coprecipitation as Photocatalysts for the Degradation of 2,4,6-Trichlorophenol

Ramos-Ramírez

Ortega

Tzompantzi

et al. 2018

Advances in Materials Science and Engineering

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“…However, for the concentration of 47 mg/L, the conversion tends to stabilize after 180 min. For Fenton‐like oxidation of phenol, the presence of two or three steps has been established: the first step consists of an induction period (in some systems it does not occur) that is followed by an increase of the reaction rate to finally reach a plateau (Inchaurrondo et al , 2017). As oxidation proceeds, finally the phenol conversion reaches a plateau value that depends on the operating conditions (Zazo et al , 2005; di Luca et al , 2014).…”

Section: Catalytic Activity Testsmentioning

confidence: 99%

Degradation of phenol using mill scale as a Fenton‐type catalyst

Salazar‐Arias

Giraldo-Gómez

Sanabria‐González

2019

Water & Environment J

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The oxidation of phenol using mill scale (waste material produced during the hot rolling of steel) as iron source in a type Fenton process was investigated in this work. The mill scale was characterized by XRF, FT-IR, XRD and SEM. The oxidation tests were carried at 25°C and atmospheric pressure, controlling the pH to 3.7. The phenol conversion and total organic carbon (TOC) removal as a function of catalyst loading (300-1000 mg/L) and phenol concentration (47 and 100 mg/L) were evaluated. The mill scale achieved high conversion of phenol (between 60.8 ± 2.2 and 94.5 ± 2.5%) and mineralization to CO 2 (between 38.9 ± 1.2 and 55.6 ± 2.5%) after 4-h reaction. The mill scale showed a good catalytic performance, even after three cycles of reaction. Therefore, utilizing mill scale as a catalyst of the Fenton process is an alternative to the use of waste in the steel industry.

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“…The bands in the 3440-3443 cm -1 range are characteristic to O-H stretching vibration, while the 1636 cm -1 band is characteristic to H-O-H bending of adsorbed water molecules. The 1093-1094, 795-797, and 467-468 cm -1 bands are characteristic to Si-O-Si asymmetric stretching, Si-O-Si symmetric stretching and Si-O-Si / Si-O-Al bending, respectively [20][21][22][23].…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

Treated diatomite for toluidine blue removal from wastewater. Is it worth it?

Măicăneanu¹,

Chicinaş²,

Bedelean³

2019

Studia UBB Chemia

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The adsorption of Toluidine Blue (TB) cationic dye was performed using raw and treated (thermal, chemical, thermo-chemical, ultrasonic) diatomite. Solid samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (EDX), and Fourier Transformed Infrared Spectroscopy (FTIR). Adsorption experiments were performed in batch conditions (20 ± 2°C, 100 mg TB/L, 100 mL, 0.1 g adsorbent). The best sample proved to be the one thermally treated at 250°C for 2 h with an adsorption capacity of 7.97 mg/L and 77% removal efficiency. The regeneration process of the used diatomite was also performed (calcination, HCl, water), the most efficient was the one using water. Kinetic models (pseudo-first-, pseudo-second-order, liquid film, and intra-particle diffusion) were considered to describe the experimental data. The calculated data showed that liquid film diffusion might be rate-determining step in this case.

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Modified diatomites for Fenton-like oxidation of phenol

Cited by 28 publications

References 48 publications

Activated Hydrotalcites Obtained by Coprecipitation as Photocatalysts for the Degradation of 2,4,6-Trichlorophenol

Activated Hydrotalcites Obtained by Coprecipitation as Photocatalysts for the Degradation of 2,4,6-Trichlorophenol

Degradation of phenol using mill scale as a Fenton‐type catalyst

Treated diatomite for toluidine blue removal from wastewater. Is it worth it?

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