Aspirantes
Estudiantes
Docentes
Administrativos
Portal de Empleo
Correo Institucional

Removal of natural organic matter for drinking water production by Al/Fe-PILC-catalyzed wet peroxide oxidation: Effect of the catalyst preparation from concentrated precursors

Galeano, Luis-Alejandro Y Bravo, P. Fernando Y Gil, Antonio Y Luna, D. Cristian Y Vicente, M. Angel (2012) Removal of natural organic matter for drinking water production by Al/Fe-PILC-catalyzed wet peroxide oxidation: Effect of the catalyst preparation from concentrated precursors. Applied Catalysis B: Environmental, 111 (112). pp. 527-535.

Full text not available from this repository.

Resumen

Catalytic wet peroxide oxidation (CWPO) has been assessed at semi-batch lab scale for the removal of natural organic matter (NOM) from raw surface water currently employed as feedstock in a drinking water treatment's plant. The peroxide solution has been stepwise added and its catalytic activation carried out by Al/Fe-pillared clays prepared from concentrated or diluted both, metal precursor solutions and clay suspensions (aqueous or ethanolic). An improved hydrolysis ratio (OH/(Al + Fe)) of 1.6 was found by Ferron analyses for the preparation of the concentrated metal precursor ([Al + Fe] = 0.628 mol/dm3), without significant metal loss by precipitation. Increased concentration of the pillaring precursor solution led to: (i) slightly decreased and (ii) more broadly distributed XRD-basal spacings, but also (iii) higher cationic compensation on the starting clay. Ethanol as suspension medium enabled the oligomer intercalation to be less susceptible against the clay concentration. It was achieved up to 96% of chemical oxygen demand (COD) removal in 4 h and total color removal in less than 45 min of reaction for a selected catalyst, under very mild conditions of room temperature and atmospheric pressure. The clay catalysts displayed high chemical stability against iron leaching. In addition, the solid prepared from the concentrated metal precursor in a 25% (w/v) ethanolic suspension successfully performed in a high demanding catalytic test, which involved very high humic substrate-to-catalyst ratio, prolonged time of reaction (24 h) and close to neutral pH of reaction (7.5), identical to that featured by the raw surface water.

Tipo de Elemento: Artículo
Palabras Clave: CWPONatural organic matterPillared clayDrinking waterHumic substances
Asunto: Q Ciencias > QD Chemistry
Division: Facultad de Ciencias Exactas y Naturales > Programa de Química > Productividad
Depósito de Usuario: PhD Luis Alejandro Galeano
Fecha Deposito: 07 May 2018 17:40
Ultima Modificación: 07 May 2018 17:40
URI: http://sired.udenar.edu.co/id/eprint/4499

Ver Elemento Ver Elemento