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5 results on '"Maureira-Cortés, Héctor"'

1. Nanostructured Magnetite Coated with BiOI Semiconductor: Readiness Level in Advanced Solar Photocatalytic Applications for the Remediation of Phenolic Compounds in Wastewater from the Wine and Pisco Industry.

Author

Gallegos-Alcaíno, Alejandra, Barría, Gabriela Paz, Moreno, Yanko, Fernández, Iván, Poblete, Rodrigo, Maureira-Cortés, Héctor, Figueroa Alvarado, Antonia Cristal, Hernández, Constanza Belén, and Flores, José

Subjects
FOURIER transform infrared spectroscopy, CLEAN energy, WASTEWATER treatment, REFLECTANCE spectroscopy, CAFFEIC acid
Abstract

Heterogeneous photocatalysis is an advanced, efficient oxidation process that uses solar energy to be sustainable and low-cost compared to conventional wastewater treatments. This study synthesized BiOI/Fe3O4 using the solvothermal technique, evaluating stoichiometric ratios of Bi/Fe (2:1, 3:1, 5:1, and 7:1) under simulated solar irradiation to optimize the degradation of caffeic acid, a pollutant found in wastewater from the wine and pisco industry. The nanomaterial with a 5:1 ratio (BF-5) was the most effective, achieving a degradation of 77.2% in 180 min. Characterization by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH), Fourier Transform Infrared Spectroscopy (FTIR), Diffuse Reflectance Spectroscopy (DRS), and Vibrating Sample Magnetometry (VSM) showed that BF-5 has a porous three-dimensional structure with BiOI nanosheets coating the Fe3O4 surface, while retaining the pristine BiOI properties. The magnetite provided magnetic properties that facilitated the recovery of the photocatalyst, reaching 89.4% recovery. These findings highlight the potential of BF-5 as an efficient and recoverable photocatalyst for industrial applications. The technical, economic, and environmental feasibility were also evaluated at the technological readiness level (TRL) to project solar photocatalysis in real applications. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Streamflow droughts aggravated by human activities despite management

Author

Van Loon, Anne F., Rangecroft, Sally, Coxon, Gemma, Werner, Micha, Wanders, Niko, Di Baldassarre, Giuliano, Tijdeman, Erik, Bosman, Marianne, Gleeson, Tom, Nauditt, Alexandra, Aghakouchak, Amir, Breña-Naranjo, Jose Agustin, Cenobio-Cruz, Omar, Costa, Alexandre Cunha, Fendekova, Miriam, Jewitt, Graham, Kingston, Daniel G., Loft, Jessie, Mager, Sarah M., Mallakpour, Iman, Masih, Ilyas, Maureira-Cortés, Héctor, Toth, Elena, Van Oel, Pieter, Van Ogtrop, Floris, Verbist, Koen, Vidal, Jean Philippe, Wen, Li, Yu, Meixiu, Yuan, Xing, Zhang, Miao, Van Lanen, Henny A.J., Van Loon, Anne F., Rangecroft, Sally, Coxon, Gemma, Werner, Micha, Wanders, Niko, Di Baldassarre, Giuliano, Tijdeman, Erik, Bosman, Marianne, Gleeson, Tom, Nauditt, Alexandra, Aghakouchak, Amir, Breña-Naranjo, Jose Agustin, Cenobio-Cruz, Omar, Costa, Alexandre Cunha, Fendekova, Miriam, Jewitt, Graham, Kingston, Daniel G., Loft, Jessie, Mager, Sarah M., Mallakpour, Iman, Masih, Ilyas, Maureira-Cortés, Héctor, Toth, Elena, Van Oel, Pieter, Van Ogtrop, Floris, Verbist, Koen, Vidal, Jean Philippe, Wen, Li, Yu, Meixiu, Yuan, Xing, Zhang, Miao, and Van Lanen, Henny A.J.

Abstract

Human activities both aggravate and alleviate streamflow drought. Here we show that aggravation is dominant in contrasting cases around the world analysed with a consistent methodology. Our 28 cases included different combinations of human-water interactions. We found that water abstraction aggravated all drought characteristics, with increases of 20%-305% in total time in drought found across the case studies, and increases in total deficit of up to almost 3000%. Water transfers reduced drought time and deficit by up to 97%. In cases with both abstraction and water transfers into the catchment or augmenting streamflow from groundwater, the water inputs could not compensate for the aggravation of droughts due to abstraction and only shift the effects in space or time. Reservoir releases for downstream water use alleviated droughts in the dry season, but also led to deficits in the wet season by changing flow seasonality. This led to minor changes in average drought duration (-26 to +38%) and moderate changes in average drought deficit (-86 to +369%). Land use showed a smaller impact on streamflow drought, also with both increases and decreases observed (-48 to +98%). Sewage return flows and pipe leakage possibly counteracted the effects of increased imperviousness in urban areas; however, untangling the effects of land use change on streamflow drought is challenging. This synthesis of diverse global cases highlights the complexity of the human influence on streamflow drought and the added value of empirical comparative studies. Results indicate both intended and unintended consequences of water management and infrastructure on downstream society and ecosystems.

Published
2022

3. Streamflow droughts aggravated by human activities despite management

Author

Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Van Loon, Anne F., Rangecroft, Sally, Coxon, Gemma, Werner, Micha, Wanders, Niko, Di Baldassarre, Giuliano, Tijdeman, Erik, Bosman, Marianne, Gleeson, Tom, Nauditt, Alexandra, Aghakouchak, Amir, Breña-Naranjo, Jose Agustin, Cenobio-Cruz, Omar, Costa, Alexandre Cunha, Fendekova, Miriam, Jewitt, Graham, Kingston, Daniel G., Loft, Jessie, Mager, Sarah M., Mallakpour, Iman, Masih, Ilyas, Maureira-Cortés, Héctor, Toth, Elena, Van Oel, Pieter, Van Ogtrop, Floris, Verbist, Koen, Vidal, Jean Philippe, Wen, Li, Yu, Meixiu, Yuan, Xing, Zhang, Miao, Van Lanen, Henny A.J., Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Van Loon, Anne F., Rangecroft, Sally, Coxon, Gemma, Werner, Micha, Wanders, Niko, Di Baldassarre, Giuliano, Tijdeman, Erik, Bosman, Marianne, Gleeson, Tom, Nauditt, Alexandra, Aghakouchak, Amir, Breña-Naranjo, Jose Agustin, Cenobio-Cruz, Omar, Costa, Alexandre Cunha, Fendekova, Miriam, Jewitt, Graham, Kingston, Daniel G., Loft, Jessie, Mager, Sarah M., Mallakpour, Iman, Masih, Ilyas, Maureira-Cortés, Héctor, Toth, Elena, Van Oel, Pieter, Van Ogtrop, Floris, Verbist, Koen, Vidal, Jean Philippe, Wen, Li, Yu, Meixiu, Yuan, Xing, Zhang, Miao, and Van Lanen, Henny A.J.

Published
2022

4. Streamflow droughts aggravated by human activities despite management

Author

Van Loon, Anne F, primary, Rangecroft, Sally, additional, Coxon, Gemma, additional, Werner, Micha, additional, Wanders, Niko, additional, Di Baldassarre, Giuliano, additional, Tijdeman, Erik, additional, Bosman, Marianne, additional, Gleeson, Tom, additional, Nauditt, Alexandra, additional, Aghakouchak, Amir, additional, Breña-Naranjo, Jose Agustin, additional, Cenobio-Cruz, Omar, additional, Costa, Alexandre Cunha, additional, Fendekova, Miriam, additional, Jewitt, Graham, additional, Kingston, Daniel G, additional, Loft, Jessie, additional, Mager, Sarah M, additional, Mallakpour, Iman, additional, Masih, Ilyas, additional, Maureira-Cortés, Héctor, additional, Toth, Elena, additional, Van Oel, Pieter, additional, Van Ogtrop, Floris, additional, Verbist, Koen, additional, Vidal, Jean-Philippe, additional, Wen, Li, additional, Yu, Meixiu, additional, Yuan, Xing, additional, Zhang, Miao, additional, and Van Lanen, Henny A J, additional

Published
2022
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5. Groundwater level trends and recharge event characterization using historical observed data in semi-arid Chile.

Author

Valois, Remi, MacDonell, Shelley, Núñez Cobo, Jorge Humberto, and Maureira-Cortés, Héctor

Subjects
GROUNDWATER, STREAMFLOW, WATER levels, POWER spectra, TIME series analysis, WATER table
Abstract

Groundwater is an important resource in semi-arid Chile to meet local social, economic and environmental water demands. Historical ground water level (GWL) data (1986–2014) in the Coquimbo Region were analysed to characterize short and long-term alluvial aquifer dynamics. Long-term trends were assessed using a seasonal Mann-Kendall trend test, which indicated that more than 80% of the time series exhibit a negative trend. Short-term analysis using cross-correlation provided information on recharge origin and its spatial pattern. Runoff and GWL are highly correlated depending on elevation, signifying that stream to aquifer flow is an important recharge process at higher altitudes. Long-term recharge behaviour was characterized using time-frequency wavelet power spectra. The results show significant amplitude of the 5-year recharge period for GWL, which is driven by a 5-year El Niño index periodicity. Such results provide key information of the spatiotemporal functioning of aquifers. [ABSTRACT FROM AUTHOR]

Published
2020
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