Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments

Heterogeneous photocatalytic processes have attracted massive attention as potentially efficient, environmentally friendly and low cost methods for water purification. However, some limitations regarding to recovery and reuse of the photocatalysts have inhibited their application in real systems. Th...

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Autor principal: Aparicio, Francisca
Otros Autores: Mártire, Daniel O.
Formato: Tesis Tesis de doctorado
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Exactas
Agua
Nanopartículas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79366
https://doi.org/10.35537/10915/79366
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79366
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Agua
Nanopartículas
spellingShingle Ciencias Exactas
Agua
Nanopartículas
Aparicio, Francisca
Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
topic_facet Ciencias Exactas
Agua
Nanopartículas
description Heterogeneous photocatalytic processes have attracted massive attention as potentially efficient, environmentally friendly and low cost methods for water purification. However, some limitations regarding to recovery and reuse of the photocatalysts have inhibited their application in real systems. This issue can be overcome providing magnetic properties to the photocatalysts allowing an efficient separation and recovery with an external magnetic field. In this work, magnetic nanocomposites were developed to be used as photocatalysts in photochemical treatments for the degradation of pollutants from wastewater. Carbon coated iron and copper oxides nanocomposites were prepared by using the precursor method under different conditions. Soluble substances isolated from urban biowaste were used as carbon sources in the synthesis procedure. The composition, texture, structure and morphology of the nanocomposites were thoroughly characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray absorption spectroscopy (XRS), elemental analysis, nitrogen (N2) sorption analysis, thermogravimetric analysis (TGA), high resolution transmission electron microscopy (HR TEM), UV-Vis diffuse reflectance spectroscopy (DRS) and vibrating sample magnetometer (VSM). The capacity of the as-prepared nanocomposites for the generation of reactive species under UVA light was evaluated by laser flash photolysis (LFP) experiments and by the electronic paramagnetic resonance (EPR) spin-trap technique. Their photocatalytic activities were tested by using carbamazepine (CBZ) as model of an emerging pollutant (EP), under UVA light by varying different parameters including composition and concentration of the photocatalysts. The as-prepared nanocomposites showed a strong dependence of their photocatalytic activity on the synthesis conditions. Particularly, nanocomposites obtained with the lower organic matter content and pyrolyzed at 600 and 800 °C yielded the highest photocatalytic activities for the CBZ degradation. In summary, this Thesis reports the methods of preparation of magnetic photocatalysts with environmental applications, revalorizing solid urban wastes as the carbon sources necessary for the synthesis of the precursor complexes. The use of products obtained from urban wastes for making photocatalysts for the treatment of wastewaters is expected to contribute to the sustainability of these procedures.
author2 Mártire, Daniel O.
author_facet Mártire, Daniel O.
Aparicio, Francisca
format Tesis
Tesis de doctorado
author Aparicio, Francisca
author_sort Aparicio, Francisca
title Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
title_short Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
title_full Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
title_fullStr Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
title_full_unstemmed Obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
title_sort obtaining magnetic nanoparticles as low-cost photocatalysts for water treatments
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/79366
https://doi.org/10.35537/10915/79366
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bdutipo_str Repositorios
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