Heterogeneous photocatalysis of real textile wastewater: Evaluation of reaction kinetics and characterization

Sahoo, Chittaranjan; Gupta, Ashok Kumar; Pillai, Indu M. Sasidharan

doi:10.1080/10934529.2012.695996

Cited by 36 publications

(10 citation statements)

References 31 publications

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“…Various instruments used in the study were reported elsewhere. [28] Catalyst characterization Commercially available microsized TiO 2 obtained from Merck India and the silver ion doped micro TiO 2 prepared in the laboratory by liquid impregnation method were characterized by field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), Xray diffraction (XRD), Fourier transform infrared analysis (FTIR), diffused reflectance spectra (DRS) and micropore analysis. The details of the analyses were reported elsewhere.…”

Section: Materials and Reagentsmentioning

confidence: 99%

Photocatalytic degradation of methyl blue by silver ion-doped titania: Identification of degradation products by GC-MS and IC analysis

Sahoo

Gupta

2015

Journal of Environmental Science and Health, Part A

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An anionic triphenyl methane dye, methyl blue ((disodium;4-[4-[[4-(4-sulfonatoanilino)phenyl]-[4-(4-sulfonatophenyl)azaniumylidenecyclohexa-2,5-dien-1-ylidene]methyl]anilino]benzene sulfonate) was degraded photocatalytically with undoped micro-TiO2- and Ag(+)-doped micro TiO2 in a slurry-type batch reactor under UV irradiation and the efficiency was compared with that obtained using nano-TiO2- and Ag(+)-doped nano-TiO2. The influence of different parameters, i.e., photocatalyst loading, dye concentration, initial pH, temperature, depth of solution, interfering ions and electron acceptors on the dye degradation was investigated. The decolorization and mineralization efficiency was better for Ag(+)-doped micro-TiO2 than undoped micro-TiO2. Nano-TiO2 was more efficient than micro-TiO2, while Ag(+)-doped nano-TiO2 was the most efficient of all. Cost analysis showed degradation using micro-TiO2- and Ag(+)-doped micro-TiO2 are much cheaper than that using nano-TiO2 and Ag(+)-doped nano-TiO2. Therefore Ag(+)-doped micro-TiO2 was used for the detailed study. The degradation products formed were identified using GC-MS analysis after photocatalytic degradation for 180 min with Ag(+) -doped micro TiO2. Ion chromatography analysis was carried out for anions to identify the end products of degradation.

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Section: Materials and Reagentsmentioning

confidence: 99%

Photocatalytic degradation of methyl blue by silver ion-doped titania: Identification of degradation products by GC-MS and IC analysis

Sahoo

Gupta

2015

Journal of Environmental Science and Health, Part A

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“…This model assumes that adsorption is a rapid equilibrium process and that the rate-determining step of the reaction involves the species present in a monolayer at the solid-liquid interface. Furthermore if the adsorption of MET onto the surface of the photocatalysts is very low, ads ⋅ can be neglected in the denominator simplifying the equation to a pseudo-first-order equation as given by [46] = − = ads ⋅ H-L ⋅ = ⋅ .…”

Section: Kinetics Of Met Degradationmentioning

confidence: 99%

Adsorption and Photocatalytic Decomposition of theβ-Blocker Metoprolol in Aqueous Titanium Dioxide Suspensions: Kinetics, Intermediates, and Degradation Pathways

Romero

Marco

Giménez

et al. 2013

International Journal of Photoenergy

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This study reports the photocatalytic degradation of theβ-blocker metoprolol (MET) using TiO2suspended as catalyst. A series of photoexperiments were carried out by a UV lamp, emitting in the 250–400 nm range, providing information about the absorption of radiation in the photoreactor wall. The influence of the radiation wavelength on the MET photooxidation rate was investigated using a filter cutting out wavelengths shorter than 280 nm. Effects of photolysis and adsorption at different initial pH were studied to evaluate noncatalytic degradation for this pharmaceutical. MET adsorption onto titania was fitted to two-parameter Langmuir isotherm. From adsorption results it appears that the photocatalytic degradation can occur mainly on the surface of TiO2. MET removed by photocatalysis was 100% conditions within 300 min, while only 26% was achieved by photolysis at the same time. TiO2photocatalysis degradation of MET in the first stage of the reaction followed approximately a pseudo-first-order model. The major reaction intermediates were identified by LC/MS analysis such as 3-(propan-2-ylamino)propane-1,2-diol or 3-aminoprop-1-en-2-ol. Based on the identified intermediates, a photocatalytic degradation pathway was proposed, including the cleavage of side chain and the hydroxylation addition to the parent compounds.

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“…Otros estudios también demuestran que la degradación de plaguicidas como la cipermetrina mediante fotocatálisis heterogénea usando TiO 2 , se ve favorecida a un pH ácido (Yao et al, 2007; Affam y Chaudhuri, 2013), bajo ciertas condiciones de pH las sustancias orgánicas pueden disociarse y adquirir una carga neta negativa, favoreciendo su adsorción hacia la superficie del catalizador cargada positivamente bajo estas condiciones (Valencia et al, 2011;Gao et al, 2011;Vineetha et al, 2013). (Son et al, 2009;Khan et al, 2010;Sahoo et al, 2012;Montazerozohori et al, 2012;Zhao et al, 2014;da Silva et al, 2015 Las constantes de velocidad aparente k app fueron 0,0066 min -1 para radiación UV alta, y 0,0034 min -1 para radiación UV baja, indicando una mayor tasa de degradación durante los días soleados que durante días nublados. Lo anterior se explica debido a que durante los ensayos realizados con radicación UV acumulada baja aproximadamente un 50 % de los fotones UV disponibles en la radiación solar se encuentran en el componente difuso (Giménez et al, 1999)…”

Section: Resultados Y Discusiónunclassified

Fotocatálisis heterogénea para el tratamiento de aguas residuales generadas en el baño del ganado

Martínez¹,

Ruiz²,

Cardenas³

et al. 2019

rev.investig.agrar.ambient.

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Las actividades ganaderas además de utilizar grandes volúmenes de agua, generan una alta carga de contaminantes, especialmente de tipo orgánico, los cuales llegan directamente a las fuentes de agua natural alterando la calidad de las mismas. Debido a lo anterior el objetivo del siguiente trabajo fue encontrar las condiciones óptimas de operación de un sistema de fotocatálisis heterogénea con TiO2 mediada con luz solar para el tratamiento de aguas residuales provenientes del baño de ganado; para ello se especificaron dos niveles de pH (5.0 y 7.0) y dos niveles de concentración de TiO2 (0.4 y 0.6 g/L). En cada tratamiento, se recircularon 40 L del agua residual en un colector parabólico compuesto solar durante 240 minutos. La eficiencia del sistema y la cinética de degradación se determinaron en términos de la demanda química de oxígeno (DQO). Las remociones de DQO en los tratamientos fueron mayores al 50%, mientras que el diseño experimental Taguchi y la mejor relación señal/ruido (RS/R) mostraron que las condiciones óptimas de operación se obtienen para un pH igual a 5.0 y una concentración de TiO2 de 0.6 g/L alcanzando remociones del 83.2%. La cinética de degradación fue de primer orden con mayores velocidades de reacción para las mayores cantidades de UV acumulada (>142.9 W·h/m2). Por lo tanto, la fotocatálisis heterogénea con TiO2 mediada por luz solar resulta ser un tratamiento viable para la remoción de contaminantes de tipo orgánico en efluentes afectados por el desarrollo de actividades ganaderas.

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Heterogeneous photocatalysis of real textile wastewater: Evaluation of reaction kinetics and characterization

Cited by 36 publications

References 31 publications

Photocatalytic degradation of methyl blue by silver ion-doped titania: Identification of degradation products by GC-MS and IC analysis

Photocatalytic degradation of methyl blue by silver ion-doped titania: Identification of degradation products by GC-MS and IC analysis

Adsorption and Photocatalytic Decomposition of theβ-Blocker Metoprolol in Aqueous Titanium Dioxide Suspensions: Kinetics, Intermediates, and Degradation Pathways

Fotocatálisis heterogénea para el tratamiento de aguas residuales generadas en el baño del ganado

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