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Article

Eggshell-supported Catalysts for the Advanced Oxidation Treatment of Humic Acid Polluted Wastewaters

Department of Chemical and Environmental Engineering, University of Oviedo, C/ Julián Clavería, s/n. 33071 Oviedo, Spain
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Received: 31 October 2019 / Revised: 4 December 2019 / Accepted: 25 December 2019 / Published: 27 December 2019
(This article belongs to the Special Issue Wastewater Engineering and Environmental Catalysis)
Metal nanoparticles have been reported as effective catalysts for the removal of refractory compounds from industrial wastewaters in advanced oxidation processes. Additionally, hundreds of thousands of tons of eggshells are discarded worldwide each year. In this work, this waste has been evaluated as support for the synthesis of nanomaterials by wet impregnation method. Four supported catalysts, with a load of iron or copper of 5% and 15%, were prepared and thoroughly characterized by means of different techniques (elemental analysis, XRF, XRD, FTIR, N2 adsorption-desorption, SEM, TEM and TGA). The catalysts performance was evaluated in wet oxidation tests to degrade humic acids, analyzing the evolution with time of COD, biodegradability index (BOD5/COD), color number and pH. The best results were achieved with 15% Cu and 5% Fe catalysts (COD reduction being 82.3% and 75.1%, respectively), whereas a COD reduction of 58% was obtained employing non-impregnated eggshell. This can be mainly attributed to the metal loading and the good metal distribution on the surface of the support. The BOD5 value of humic acids was initially null and, in all assays, the oxidation treatment enhanced the biodegradability. Therefore, eggshell has proved to be an interesting material to be employed as support in nanoparticles preparation. View Full-Text
Keywords: copper-supported catalysts; eggshell; heterogeneous catalysis; humic acid; iron-supported catalysts; nanomaterials; wastewaters; wet oxidation copper-supported catalysts; eggshell; heterogeneous catalysis; humic acid; iron-supported catalysts; nanomaterials; wastewaters; wet oxidation
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MDPI and ACS Style

Oulego, P.; Laca, A.; Calvo, S.; Díaz, M. Eggshell-supported Catalysts for the Advanced Oxidation Treatment of Humic Acid Polluted Wastewaters. Water 2020, 12, 100. https://0-doi-org.brum.beds.ac.uk/10.3390/w12010100

AMA Style

Oulego P, Laca A, Calvo S, Díaz M. Eggshell-supported Catalysts for the Advanced Oxidation Treatment of Humic Acid Polluted Wastewaters. Water. 2020; 12(1):100. https://0-doi-org.brum.beds.ac.uk/10.3390/w12010100

Chicago/Turabian Style

Oulego, Paula, Amanda Laca, Sonia Calvo, and Mario Díaz. 2020. "Eggshell-supported Catalysts for the Advanced Oxidation Treatment of Humic Acid Polluted Wastewaters" Water 12, no. 1: 100. https://0-doi-org.brum.beds.ac.uk/10.3390/w12010100

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