Preparation of a Porous Clay Heterostructure and Study of its Adsorption Capacity of Phenol and Chlorinated Phenols from Aqueous Solutions

Arellano-Cárdenas, Sofía; Gallardo-Velázquez, Tzayhrí; Osorio-Revilla, Guillermo; López-Cortéz, Ma. del Socorro

doi:10.2175/106143007x220653

Cited by 21 publications

(8 citation statements)

References 32 publications

(35 reference statements)

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“…9, the adsorption value of magnetic sorbents for phenol was about 18 mg/g. The maximum adsorptions capacities obtained in this work were higher than those reported by Arellano-Cardenas et al [32]. However, the experimental adsorption isotherm for phenol presented a long plateau at higher equilibrium concentrations (80-500 mg/L), implying the presence of a monolayer, thus, the Freundlich model could not be used to fit the experimental data.…”

Section: Kinetic Adsorption Curve Of Magnetic Hap For Phenolcontrasting

confidence: 90%

Preparation of Magnetic Hydroxyapatite and Their Use as Recyclable Adsorbent for Phenol in Wastewater

Wang

2010

CLEAN Soil Air Water

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Magnetic hydroxyapatite (HAP), which combined superparamagnetic Fe 3 O 4 nanoparticles and HAP, composite materials were prepared by ultrasound method in this paper. It has also been found that these materials have the ability to adsorb phenol in wastewater. The magnetic materials were investigated by scanning electron microscope, X-ray diffraction (XRD), Fourier transform infrared spectroscopy, thermal gravimetric analysis, vibrating sample magnetometer, and N 2 adsorption in order to elucidate the morphology, structure, and other properties. When the prepared magnetic materials were calcined at 2008C, the prepared Fe 3 O 4 was oxidized to Fe 2 O 3 , possessing loose-shaped holes with a high specific area of 325.2 m 2 /g, a magnetization intensity of 12.5 emu/g, and the N 2 adsorption isotherm belongs to porous adsorption type I. Moreover, the magnetic HAP can adsorb 90% phenol in wastewater. This means that it is an excellent recyclable phenol sorbent for sewage treatment. Experiments confirmed that the Freundlich adsorption isotherms model applies to lower phenol concentrations (0-50 mg/L), while for high phenol concentrations (50-500 mg/L) the Langmuir adsorption isotherms model fits. The magnetic sorbents have the capacity to regenerate after reaching adsorption saturation using ethanol as eluant and external magnetic field as separation unit. The efficiency of adsorption was reduced only by 10% over a six time use period.

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Section: Kinetic Adsorption Curve Of Magnetic Hap For Phenolcontrasting

confidence: 90%

Preparation of Magnetic Hydroxyapatite and Their Use as Recyclable Adsorbent for Phenol in Wastewater

Wang

2010

CLEAN Soil Air Water

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“…have reported the presence of hydrophilic and hydrophobic sites due to the coexistence of silanol and siloxane groups in the PCHs . These authors have reported that PCHs adsorb phenol and chlorophenols by the presence of silanol groups that interact with the −OH groups of phenol by hydrogen bond (Figure ). The obtained results follow the trend phenol>3,4‐dichlorophenol>2,5‐dichlorophenol …”

Section: Uses and Applications Of Pchsmentioning

confidence: 99%

Synthesis, Characterization, Uses and Applications of Porous Clays Heterostructures: A Review

Cecilia

García‐Sancho

Vilarrasa-García

et al. 2018

The Chemical Record

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Porous clay heterostructures (PCH) are obtained by the insertion of an organic bulky cation in the interlayer spacing of a smectite, causing a swelling of the clay mineral. Right after, oxides species, mainly silicon oxide, are incorporated as pillars galleries between adjacent layers to form a porous structure after the removal of the template. The ordering of the clay mineral as well the organic cation incorporated in the synthetic step favors the modulation of the textural properties of the PCH. In addition, the incorporation of heteroatoms in the pillars galleries can also modulate the acidity of the PCH. The modulation of the pore size and the acid properties provides to these materials a wide range of applications in the fields of adsorption and catalysis. This paper carries out a detailed review of the synthesis of PCH, characterization as well as uses and application reported in the literature.

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“…Durante 60 min se tomaron volúmenes de muestra de 3 mL cada 5 min, tanto en el recipiente de mezcla (tanque de almacenamiento) como al final de la placa del reactor, incluyendo el tiempo cero. El transcurso de la reacción se siguió mediante espectrofotometría UV-visible en un rango de 200 a 500 nm (Arellano-Cárdenas et al 2007) en un espectrofotómetro (Hach, modelo DR5000, EUA).…”

Section: Descripción Del Experimentounclassified

USO DE UN REACTOR DE PLACA PLANA (TiO2/VIDRIO) PARA LA DEGRADACIÓN DE 2,5-DICLOROFENOL POR FOTOCATÁLISIS SOLAR

Esquivel

Espinoza²,

Proal-Nájera

et al. 2017

Rev. Int. Contam. Ambie.

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Palabras clave: fotocatálisis heterogénea, método sol-gel, dinámica del reactor RESUMEN La degradación de compuestos orgánicos no biodegradables presentes en aguas residuales es un punto central de la fotocatálisis solar debido a su alta eficiencia y aceptables costos de operación. Se estudió la degradación de 2,5-diclorofenol (2,5-DCF) en solución acuosa con concentración inicial variable (C0 ≤ 98 mg/L), por fotólisis y fotocatálisis solar con un reactor de placa plana (1 m 2 ) y vidrio impregnado con TiO2 sintetizado por el método sol-gel. Se establecieron dos variables de respuesta, la demanda química de oxígeno y la concentración de 2,5-DCF determinada a 280 nm, por tres factores: ángulo de inclinación (20º y 26º), flujo (355 L/h y 407 L/h) y dos procesos (fotólisis y fotocatálisis). Lo anterior en condiciones de alta (ħʋprom = 847.4 W/m 2 ) y baja intensidad (ħʋprom = 453.6 W/m 2 ) de radiación solar, para lo cual se recirculó la solución acuosa sobre la placa de vidrio durante 60 min, bajo régimen laminar y con muestras cada 5 min. Se determinaron las constantes de velocidad K1 (min -1 ) y K2 (mol/L) -1 de orden primero y cero de reacción, respectivamente. Se consideraron elementos de la dinámica del reactor en la evaluación de la cinética química de reacciones fotocatalíticas. Se alcanzaron porcentajes de degradación de 2,5-DCF superiores al 98 % por fotocatálisis solar.Key words: heterogeneous photocatalysis, sol-gel method, reactor dynamics ABSTRACTThe interest in solar photocatalysis degradation of non-biodegradable organic compounds in wastewater has raised due to its high efficiency and acceptable operation costs. The degradation of an aqueous 2,5-Dichlorophenol (2,5-DCP) solution with variable initial concentration (C0 ≤ 98 mg/L) was performed by photolysis and solar photocatalysis, using a flat glass plate (1 m 2 ) impregnated with TiO2 synthetized by

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Preparation of a Porous Clay Heterostructure and Study of its Adsorption Capacity of Phenol and Chlorinated Phenols from Aqueous Solutions

Cited by 21 publications

References 32 publications

Preparation of Magnetic Hydroxyapatite and Their Use as Recyclable Adsorbent for Phenol in Wastewater

Preparation of Magnetic Hydroxyapatite and Their Use as Recyclable Adsorbent for Phenol in Wastewater

Synthesis, Characterization, Uses and Applications of Porous Clays Heterostructures: A Review

USO DE UN REACTOR DE PLACA PLANA (TiO2/VIDRIO) PARA LA DEGRADACIÓN DE 2,5-DICLOROFENOL POR FOTOCATÁLISIS SOLAR

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