The effect of H2 treatment on the activity of activated carbon for the oxidation of organic contaminants in water and the H2O2 decomposition

Oliveira, Luiz C.A.; Silva, Cristina N.; Yoshida, María Irene; Lago, Rochel M.

doi:10.1016/j.carbon.2004.05.003

Cited by 156 publications

(79 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Oxidation under mild conditions (e.g., 15% H 2 O 2 , 100ºC, 3 hrs [27]) leads to shortened and uncapped CNTs with carboxylic groups on their surface. Nevertheless, it is well known that HPD is one of the oldest reactions found to be catalyzed by carbon materials, especially by activated carbons [28,29]. Earlier, it was found that CNT, compared to graphene and activated carbon, is also able to catalyze HPD [30].…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Voitko

Toth

Demianenko

et al. 2015

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

The catalytic performance of multi-walled carbon nanotubes (MWCNTs) with different surface chemistry was studied in the decomposition reaction of H 2 O 2 at various values of pH and temperature. A comparative analysis of experimental and quantum chemical calculation results is given. It has been shown that both the lowest calculated activation energy (~18.9 kJ/mol) and the highest rate cons tant correspond to the N-containing CNT. The calculated chemisorption energy values correlate with the operation stability of MWCNTs. Based on the proposed quantum chemical model it was found that the catalytic activity of carbon materials in electron tran sfer reactions is controlled by their electron donor capability.

show abstract

Section: Introductionmentioning

confidence: 99%

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Voitko

Toth

Demianenko

et al. 2015

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…An alternative strategy is to completely eliminate the presence of iron through the use of heterogeneous catalysts with no metallic phase, but with the adequate ability to promote the formation of the oxidizing agent. Recent results show that activated carbons are efficient in the degradation of some dissolved organic pollutants in the presence of hydrogen peroxide [10][11][12][13], providing that the carbon surface possesses suitable chemical properties. Activated carbons are known catalysts for hydrogen peroxide decomposition through the formation of hydroxyl radicals.…”

Section: Introductionmentioning

confidence: 99%

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

et al. 2010

View full text Add to dashboard Cite

“…Los datos anteriores se evaluaron mediante el método diferencial, asumiendo inicialmente que la DCPH se puede describir mediante una ley de velocidad como la de la Ecuación 3 (3) obteniéndose que el orden de reacción con respecto a la relación masa-volumen de carbón activado es uno y que la constante aparente de velocidad, k vel , es aproximadamente 0,11 mL g -1 s -1 a 298 K (0,12…”

Section: Resultados Y Discusión Variación De La Relación Masa Volumenunclassified

“…1,2 La DCPH en la superficie de sólidos ocurre selectivamente en sitios activos básicos o reductores o en sitios donde estén involucrados iones de metales tales como, hierro, cerio, manganeso, cobre, cobalto, vanadio, etc., los cuales pueden estar en diferentes estados de oxidación y/o formando complejos. [3][4][5][6] La selectividad para la DCPH en la superficie de un sólido es de utilidad para evaluar y comparar la actividad catalítica de sólidos modificados. 3,4 Esta evaluación se realiza asumiendo que la cinética de la DCPH obedece a una ley de pseudo-primer orden, Ecuación 1, a partir de la cual se calcula y se compara la constante de velocidad observada (k obs ) (1) donde [H 2 O 2 ] 0 es para la concentración inicial de peróxido de hidrógeno.…”

Section: Introductionunclassified

Estudio cinético de la descomposición catalizada de peróxido de hidrógeno sobre carbón activado

Paternina

Arias

2009

Quím. Nova

View full text Add to dashboard Cite

Recebido em 23/5/08; aceito em 7/11/08; publicado na web em 26/2/06 KINETIC STUDY OF THE CATALYZED DECOMPOSITION OF HYDROGEN PEROXIDE ON ACTIVATED CARBON. The kinetic study of decomposition of hydrogen peroxide catalyzed by activated carbon was carried out. The effect of concentrations of reactants and temperature were experimentally studied. Kinetic data were evaluated using differential method of initial rates of reaction. When a typical kinetic law for reactions in homogeneous phase is used, first order of reaction is obtained for hydrogen peroxide and activated carbon, and activation energy of 27 kJ mol -1 for the reaction was estimated. Experimentally was observed that surface of activated carbon is chemically modified during decomposition of hydrogen peroxide, based on this result a scheme of reaction was proposed and evaluated. Experimental data fits very well to a Langmuir-Hinshelwood kinetic model and activation energy of 40 kJ mol -1 was estimated for reaction in heterogeneous phase.Keywords: decomposition of hydrogen peroxide; initial rate of reaction; kinetic law of Langmuir-Hinshelwood. introducciónLa descomposición catalizada del peróxido de hidrógeno (DCPH), tanto en fase homogénea como heterogénea, es una reacción ampliamente estudiada debido a la alta reactividad de la molécula y al poder oxidante de los productos intermediarios de reacción. 1,2 La DCPH en la superficie de sólidos ocurre selectivamente en sitios activos básicos o reductores o en sitios donde estén involucrados iones de metales tales como, hierro, cerio, manganeso, cobre, cobalto, vanadio, etc., los cuales pueden estar en diferentes estados de oxidación y/o formando complejos. 3-6 La selectividad para la DCPH en la superficie de un sólido es de utilidad para evaluar y comparar la actividad catalítica de sólidos modificados. 3,4 Esta evaluación se realiza asumiendo que la cinética de la DCPH obedece a una ley de pseudo-primer orden, Ecuación 1, a partir de la cual se calcula y se compara la constante de velocidad observada (k obs ) (1) donde [H 2 O 2 ] 0 es para la concentración inicial de peróxido de hidrógeno.Lin y Gurol en 1998 estudiaron la DCPH catalizada por oxido de hierro, 7 y Huang et al. en 2003 estudiaron la descomposición catalizada por carbones activados modificados, 8 encontrando que la tendencia de los datos experimentales se ajustan a una ley ciné-tica de tipo Langmuir-Hinshelwood, como la que se muestra en la Ecuación 2,donde k vel y k h se interpretan como la constante cinética de reacción y la de formación de reactivos a partir de intermediarios, respectivamente; CAT es la relación masa/volumen de carbón activado y [H 2 O 2 ] 0 es la concentración inicial de peróxido de hidrógeno. Sin embargo estos estudios no se realizaron de manera sistemática, esto es, se llevaron a cabo a una sola temperatura y una sola relación masa-volumen de catalizador y además se realizaron pocos experimentos en un pequeño intervalo de concentraciones iniciales de peróxido de hidrógeno (1,8x10 -3 a 4,0x10 -2 mol L -1 ).En los trabajos p...

show abstract

The effect of H2 treatment on the activity of activated carbon for the oxidation of organic contaminants in water and the H2O2 decomposition

Cited by 156 publications

References 31 publications

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

Estudio cinético de la descomposición catalizada de peróxido de hidrógeno sobre carbón activado

Contact Info

Product

Resources

About