Functionalized mesoporous silicas SBA-15 for heterogeneous photocatalysis towards CECs removal from secondary urban wastewater
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10347/26982
Files in this item
Metadata
Title: | Functionalized mesoporous silicas SBA-15 for heterogeneous photocatalysis towards CECs removal from secondary urban wastewater |
Author: | Castanheira, Bruna Otubo, Larissa Oliveira, Cristiano Luis Pinto Montes Goyanes, Rosa María Quintana Álvarez, José Benito Rodil Rodríguez, María del Rosario Brochsztain, Sergio Vilar, Vítor J. P. Silva Costa Teixeira, Antonio Carlos |
Affiliation: | Universidade de Santiago de Compostela. Departamento de Química Analítica, Nutrición e Bromatoloxía Universidade de Santiago de Compostela. Instituto de Investigación e Análises Alimentarias |
Subject: | Advanced oxidation processes | Photocatalysis | Mesoporous silicas | FluHelik photoreactor | Sulfadiazine | |
Date of Issue: | 2021 |
Publisher: | Elsevier |
Citation: | B. Castanheira et al. Chemosphere, 2022, 287, 132023 |
Abstract: | The photocatalytic activity of TiO2 nanoparticles (NPs) supported on mesoporous silica SBA-15 (TiO2/SBA-15) was evaluated for the photodegradation of sulfadiazine (SDZ), as target contaminant of emerging concern (CEC), using either pure water solutions (PW) or a real secondary urban wastewater (UWW) spiked with SDZ. For this purpose, TiO2/SBA-15 samples with 10, 20 and 30% TiO2 (w/w) were prepared by the sol-gel post synthetic method on pre-formed SBA-15, using titanium (IV) isopropoxide as a precursor. The TiO2/SBA-15 materials were characterized by HRTEM, SAXS and XRD, nitrogen adsorption isotherms and UV–vis diffuse reflectance spectroscopy. TiO2 NPs were shown to be attached onto the external surface, decorating the SBA-15 particles. The TiO2/SBA-15 catalysts were active in SDZ photodegradation using the annular FluHelik photoreactor, when irradiated with UVA light. The 30% TiO2/SBA-15 sample presented the best performance in optimization tests performed using PW, and it was further used for the tests with UWW. The photocatalytic activity of 30% TiO2/SBA-15 was higher (56% SDZ degradation) than that of standard TiO2–P25 (32% SDZ degradation) in the removal of SDZ spiked in the UWW ([SDZ] = 2 mg L−1). The photodegradation of SDZ with 30% TiO2/SBA-15 eached 90% for UWW spiked with a lower SDZ concentration ([SDZ] = 40 μg L−1). Aside of SDZ, a suit of 65 other CECs were also identified in the UWW sample using LC-MS spectrometry. A fast-screening test showed the heterogeneous photocatalytic system was able to remove most of the detected CECs from UWW, by either adsorption and/or photocatalysis. |
Publisher version: | https://doi.org/10.1016/j.chemosphere.2021.132023 |
Embargo: | 2023-08-24 |
URI: | http://hdl.handle.net/10347/26982 |
DOI: | 10.1016/j.chemosphere.2021.132023 |
ISSN: | 0045-6535 |
Rights: | © 2021, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
Collections
-
- ChromChem-Artigos [54]
- IIAQBUS-Artigos [66]
- QANB-Artigos [242]