Enhanced photocatalytic degradation of azo dyes using nano Fe3O4

Solomon, R. V.; Lydia, I. Sharmila; Merlin, J. Princy; Venuvanalingam, Ponnambalam

doi:10.1007/s13738-011-0033-8

Cited by 75 publications

(29 citation statements)

References 34 publications

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“…Teniendo en cuenta las propiedades magnéticas que tiene la magnetita, ésta se ha obtenido por medio de la síntesis de expansión reductiva (RES), la cual se basa en la reacción que se da entre la urea que debe estar en exceso y compuestos de nitrato en una atmósfera inerte y en calentamiento a alta temperatura con el fin de obtener partículas de metales con valencia 0 como primer producto, con el transcurrir del tiempo y otro calentamiento rápido se pueden obtener las NPs de interés. El análisis consistió en observar el comportamiento de la reacción bajo una atmósfera oxidante, determinándose por difracción de rayos x que la reacción descrita anteriormente bajo esta condición sí sintetiza las partículas esperadas; sin embargo, el diámetro de las mismas superó los 100 nm indicando que son submicrométricas [16].…”

Section: Análisis Teóricounclassified

Síntesis de nanopartículas de magnetita a partir del extracto de cáscara de papaya para la degradación de colorantes azoicos en soluciones acuosas

Ardila

Pardo

Pataquiva-Mateus

2019

Ingeniare. Rev. chil. ing.

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Síntesis de nanopartículas de magnetita a partir del extracto de cáscara de papaya para la degradación de colorantes azoicos en soluciones acuosasSynthesis of magnetite nanoparticles using papaya peel extract for the azo dyes degradation in aqueous solutions RESUMEN El presente documento describe el proceso realizado para sintetizar nanopartículas de magnetita Fe 3 O 4 a partir de extracto de cáscara de papaya mediante una reacción simple y ecológica. Para la realización de la síntesis se verifica la cantidad de glucosa presente en las cáscaras puesto que este carbohidrato es indispensable como agente reductor en la reacción, el procedimiento se realiza para tres muestras diferentes las cuales son evaluadas por medio de microscopia infrarroja FTIR y comparadas con una muestra comercial, por otro lado, se evidencia por medio de una prueba SEM si el tamaño de los productos obtenidos corresponden a material nanométrico y si la morfología efectivamente corresponde a magnetita; posterior a esto se realiza la degradación de colorantes azoicos dando resultados positivos para el colorante azul brillante E-133 mostrando transparencia en el medio lo que se verifica de manera cuantitativa por medio de espectroscopia UV-Vis. ABSTRACTThis document describes the Fe 3 O 4 magnetite nanoparticles process synthesis via papaya peel extract by a simple and ecological reaction. For the synthesis, is verified the amount of glucose present in the shells since this carbohydrate is indispensable as a reducing agent in the reaction, the method is make for three different samples that are evaluated by infrared microscopy FTIR and compared with a commercial sample, in the other hand by SEM was possible see if the size and morphology corresponding to the expected results; subsequent the azo dyes degradation give positive results for the bright blue E-133 dye showing the transparency in the medium and is checked quantitatively through of UV-Vis spectroscopy.

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Section: Análisis Teóricounclassified

Síntesis de nanopartículas de magnetita a partir del extracto de cáscara de papaya para la degradación de colorantes azoicos en soluciones acuosas

Ardila

Pardo

Pataquiva-Mateus

2019

Ingeniare. Rev. chil. ing.

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“…Although, these techniques are efficient for the removal of dye stuffs from the textile wastewater but cause problems related with regeneration of adsorbent materials and post-treatment of solid wastes. Recently, semiconductor photocatalysis has been given great advantages over other techniques because of its potential to destroy a wide range of toxic organic and inorganic substances in aqueous medium at ambient temperatures and pressure with no harmful by-products [7]. The effective degradation of organic and inorganic pollutants depend upon the particle size, surface area, surface charge properties of semiconductors, nature of dye molecules and pH of dye solutions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and photocatalytic activity of silver nanoparticles/amidoxime-modified polyacrylonitrile nanofibers

et al. 2015

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Polyacrylonitrile (PAN) nanofibers were prepared by an electrospinning technique, which were chemically modified with amidoxime groups. The silver nanoparticles were then synthesized on amidoxime modified PAN (OM-PAN), which was used for the photodegradation of methyl orange in aqueous solution. The SEM images showed that the average diameter of PAN nanofibers was below 200 nm. The SEM micrograph also showed that the silver nanoparticles were well dispersed on the surface of OM-PAN nanofiber mat. The micrograph also presented that the average size of silver nanoparticles was below 100 nm. The photodegradation study showed that the degradation of methyl orange in aqueous medium was increased as increased the irradaition time. The results illustrated that silver nanoparticles (Ag)/OM-PAN nanofiber mat degraded about 80 % of methyl orange within 6 h. The degradation efficiency was found to be pH dependent and maximum degradation was found at lower pH (about 90 % of dye is degraded at pH 2). The Ag/OM-PAN nanofiber dosage presented that the degradation of dye was increased as increased the catalyst dosage.

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“…Recently, the applications of magnetic nanoparticles as catalyst supports have become a hot topic due to their unique properties such as high surface area, good dispersion, and magnetic behavior, as well as their low toxicity. Furthermore, improved activity is usually achieved in the nanometer‐sized supported catalyst due to its high surface area and good dispersion properties . Design‐Expert 7.0.0 software (Stat Ease, Minneapolis, MN, USA) and formal batch adsorption were used for this study.…”

Section: Introductionmentioning

confidence: 99%

Developments of modified magnetic nanoparticle‐supported heteropolyacid photocatalytic performances in methylene blue scavenger

Kazemi

Teimouri

Salavati

2018

J Chinese Chemical Soc

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In this project, the Keggin‐type polyoxometalate, H5PMoV2O40 (denoted as PMoV), was immobilized on modified NiFe2O4 nanoparticles to produce a magnetically separable catalyst. This catalyst was characterized using X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FT‐IR), field emission scanning electron microscopy (FESEM), cyclic voltammetry (CV), energy‐dispersive X‐ray (EDX), and UV–vis diffuse reflectance spectroscopy (UV‐DRS). The synthesized catalyst demonstrated a high photocatalytic activity in the degradation of methylene blue (denoted as MB) as a pollutant under UV light irradiation. The catalyst could be readily separated from the photocatalytic system using the magnetic field, and the loss of activity was negligible when the catalyst was recovered in five consecutive runs. In addition, optimization was performed using multiresponse optimization and the desirability function approach of the central composite design (CCD). The effects of various factors, such as the catalyst amount, contact time, and pH, on the degradation of MB were investigated. Optimization results for the 20 mg/L MB showed that the maximum degradation efficiency of 95.8% at optimum conditions was: catalyst amount: 22.35 mg, pH = 7.81, and time: 67 min, at ambient pressure and temperature.

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Enhanced photocatalytic degradation of azo dyes using nano Fe3O4

Cited by 75 publications

References 34 publications

Síntesis de nanopartículas de magnetita a partir del extracto de cáscara de papaya para la degradación de colorantes azoicos en soluciones acuosas

Síntesis de nanopartículas de magnetita a partir del extracto de cáscara de papaya para la degradación de colorantes azoicos en soluciones acuosas

Synthesis, characterization and photocatalytic activity of silver nanoparticles/amidoxime-modified polyacrylonitrile nanofibers

Developments of modified magnetic nanoparticle‐supported heteropolyacid photocatalytic performances in methylene blue scavenger

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