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Dr. Pamela Lazo
Universidad de Valparaíso

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Journal article
Published: 17 November 2020 in Minerals
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In Chile, 85% of tailings impoundments are inactive or abandoned and many of them do not have a program of treatment or afforestation. The phytoremediation of tailings with Oxalis gigantea, Cistanthe grandiflora, Puya berteroniana and Solidago chilensis have been tested in order to find plants with ornamental value and low water requirements, which enable reductions in molybdenum (Mo), copper (Cu) or lead (Pb) concentrations creating an environmentally friendly surrounding. Ex-situ phytoremediation experiments were carried out for seven months and Mo, Cu and Pb were measured at the beginning and at the end of the growth period. The capacity of these species to phyto-remedy was evaluated using the bioconcentration and translocation factors, along with assessing removal efficiency. Solidago chilensis showed the ability to phytoextract Mo while Puya berteroniana showed potential for Cu and Mo stabilization. The highest removal efficiencies were obtained for Mo, followed by Cu and Pb. The maximum values of removal efficiency for Mo, Cu and Pb were 28.7% with Solidago chilensis, 15.6% with Puya berteroniana and 8.8% with Cistanthe grandiflora, respectively. Therefore, the most noticeable results were obtained with Solidago chilensis for phytoextraction of Mo.

ACS Style

Pamela Lazo; Andrea Lazo. Assessment of Native and Endemic Chilean Plants for Removal of Cu, Mo and Pb from Mine Tailings. Minerals 2020, 10, 1020 .

AMA Style

Pamela Lazo, Andrea Lazo. Assessment of Native and Endemic Chilean Plants for Removal of Cu, Mo and Pb from Mine Tailings. Minerals. 2020; 10 (11):1020.

Chicago/Turabian Style

Pamela Lazo; Andrea Lazo. 2020. "Assessment of Native and Endemic Chilean Plants for Removal of Cu, Mo and Pb from Mine Tailings." Minerals 10, no. 11: 1020.

Article
Published: 23 June 2020 in ChemElectroChem
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In this work we report a simple and cost‐effective CsPbBr 3 ‐based solar cell without ordinary selective contacts. To do so we follow an electrochemical approach consisting of three successive steps: (1) electrodeposition of PbO 2 directly on top of FTO substrates, (2) heterogeneous phase reaction with gaseous HBr and (3) spin‐coating of methanolic CsBr solutions followed by annealing. This method is more adequate for large‐scale environmentally‐friendly production as it reduces chemical waste, particularly toxic lead. The resulting films were structurally and optically characterized showing good coverage of the FTO substrates, absence of defects such as pinholes and orthorhombic structure. Photovoltaic and impedance characterization was carried out by pressing a carbon coated metal spring onto the CsPbBr 3 film until obtaining maximized open‐circuit potential ( Voc ) and short‐circuit photocurrent density ( jsc ) under simulated sunlight. The stabilized current at fixed voltage (SCFV) technique gave a maximum PCE value of 2.70% close to devices with similar configuration. Impedance measurements demonstrated analogous behaviour to that of state‐of‐art CsPbBr 3 based solar cells, comprising a recombination arc at mid‐high frequencies, geometrical capacitance and ideality factors closed to 2, typical of SRH recombination in the perovskite bulk.

ACS Style

Daniel Ramírez; Gonzalo Riveros; Patricia Díaz; Javier Verdugo; Gerard Núñez; Susy Lizama; Pamela Lazo; Enrique A. Dalchiele; Daniel L. Gau; Ricardo E. Marotti; Juan A. Anta; Lidia Contreras‐Bernal; Antonio Riquelme; Jesús Idigoras. Electrochemically Assisted Growth of CsPbBr 3 ‐Based Solar Cells Without Selective Contacts. ChemElectroChem 2020, 7, 1 .

AMA Style

Daniel Ramírez, Gonzalo Riveros, Patricia Díaz, Javier Verdugo, Gerard Núñez, Susy Lizama, Pamela Lazo, Enrique A. Dalchiele, Daniel L. Gau, Ricardo E. Marotti, Juan A. Anta, Lidia Contreras‐Bernal, Antonio Riquelme, Jesús Idigoras. Electrochemically Assisted Growth of CsPbBr 3 ‐Based Solar Cells Without Selective Contacts. ChemElectroChem. 2020; 7 (19):1.

Chicago/Turabian Style

Daniel Ramírez; Gonzalo Riveros; Patricia Díaz; Javier Verdugo; Gerard Núñez; Susy Lizama; Pamela Lazo; Enrique A. Dalchiele; Daniel L. Gau; Ricardo E. Marotti; Juan A. Anta; Lidia Contreras‐Bernal; Antonio Riquelme; Jesús Idigoras. 2020. "Electrochemically Assisted Growth of CsPbBr 3 ‐Based Solar Cells Without Selective Contacts." ChemElectroChem 7, no. 19: 1.

Journal article
Published: 17 October 2019 in International Journal of Environmental Research and Public Health
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The analysis of Cu distribution in pre-treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction. The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. The tailing was treated with a leaching solution for 24 h. Three different solutions were tested: H2SO4 + HNO3 with pH = 1.9; H2SO4 + HNO3 with pH = 4.2; and NH4Cl 0.8 mol/L with pH = 5.5. After that, electrodialytic remediation experiments were carried out using an electric field of 2.7 V/cm for 15 days. The best performance for the complete cell was obtained with H2SO4 + HNO3 solutions, with a copper removal efficiency in the range of 62% to 67% and a current efficiency between 6% and 9%. The results of the remaining copper concentration between anode and cathode, from both procedures of sequential extraction, showed similar trends. The differences were mainly attributed to the use of different extractant solutions and extraction times. Soluble and exchangeable fractions were easily removed, with efficiencies higher than 80%. The lowest copper removal efficiency was obtained with NH4Cl 0.8 mol/L.

ACS Style

Andrea Lazo; Pamela Lazo; Alejandra Urtubia; María Gabriela Lobos; Claudia Gutiérrez; Henrik K. Hansen. Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings. International Journal of Environmental Research and Public Health 2019, 16, 3957 .

AMA Style

Andrea Lazo, Pamela Lazo, Alejandra Urtubia, María Gabriela Lobos, Claudia Gutiérrez, Henrik K. Hansen. Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings. International Journal of Environmental Research and Public Health. 2019; 16 (20):3957.

Chicago/Turabian Style

Andrea Lazo; Pamela Lazo; Alejandra Urtubia; María Gabriela Lobos; Claudia Gutiérrez; Henrik K. Hansen. 2019. "Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings." International Journal of Environmental Research and Public Health 16, no. 20: 3957.

Journal article
Published: 18 February 2019 in International Journal of Environmental Research and Public Health
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Mine tailings have been analyzed by a sequential extraction procedure after their pre-treatment with a leaching solution for 24 h and electrodialytic remediation during 15 days with a constant electric field of 2.7 V cm−1. Four leaching solutions were tested: H2SO4 + HNO3 (2:1 vol.) pH = 1.9; H2SO4 + HNO3 (2:1 vol) pH = 4.2; NH4Cl 0.8M, pH = 5.5 and 30% H2O2 adjusted to pH 2 with HNO3 1M + HCl 1M. After the treatment, the tailings were divided in six slices from anode to cathode. The highest removal efficiency of copper was obtained with H2SO4 + HNO3 pH = 1.9, which allows one to remove 67% of the copper in the total cell and 85% of the copper in the slice closest to anode. The same solution with pH = 4.2 allows one to remove 62% of the total copper. The analysis realized by the sequential extraction method indicates the easy removal of water-soluble and exchangeable fractions in all experiments, moreover, residual and sulfide are the less mobile fractions. The general trend was the movement of copper associated to different fractions from anode to cathode and its accumulation closest to the cathode in the case of exchangeable, Fe-Mn oxides and acid soluble fractions, possibly due to some precipitation of copper compounds associated with less acidic conditions.

ACS Style

Andrea Lazo; Henrik K. Hansen; Pamela Lazo; Claudia Gutiérrez. Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation. International Journal of Environmental Research and Public Health 2019, 16, 584 .

AMA Style

Andrea Lazo, Henrik K. Hansen, Pamela Lazo, Claudia Gutiérrez. Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation. International Journal of Environmental Research and Public Health. 2019; 16 (4):584.

Chicago/Turabian Style

Andrea Lazo; Henrik K. Hansen; Pamela Lazo; Claudia Gutiérrez. 2019. "Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation." International Journal of Environmental Research and Public Health 16, no. 4: 584.

Journal article
Published: 06 October 2018 in Journal of Hazardous Materials
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In the present work, an electrocoagulation technique was tested as a possible technological alternative for the treatment of selenium in wastewater from a petroleum refinery. For this purpose, a batch airlift reactor with air stirring was used. The sacrificial electrodes were made of iron to generate the necessary ferrous ions for the process. The results indicated a selenium removal of 90% from the wastewater after 6 hour of treatment, achieving a decrease in concentration from 0.30 mg L-1 to 0.03 mg L-1. The current density was found to be an important variable for the process. In conclusion, the electrocoagulation process seems to be a feasible selenium removal technique applied to petroleum refinery wastewater.

ACS Style

Henrik K. Hansen; Sebastián Franco Peña; Claudia Gutiérrez; Andrea Lazo; Pamela Lazo; Lisbeth M. Ottosen. Selenium removal from petroleum refinery wastewater using an electrocoagulation technique. Journal of Hazardous Materials 2018, 364, 78 -81.

AMA Style

Henrik K. Hansen, Sebastián Franco Peña, Claudia Gutiérrez, Andrea Lazo, Pamela Lazo, Lisbeth M. Ottosen. Selenium removal from petroleum refinery wastewater using an electrocoagulation technique. Journal of Hazardous Materials. 2018; 364 ():78-81.

Chicago/Turabian Style

Henrik K. Hansen; Sebastián Franco Peña; Claudia Gutiérrez; Andrea Lazo; Pamela Lazo; Lisbeth M. Ottosen. 2018. "Selenium removal from petroleum refinery wastewater using an electrocoagulation technique." Journal of Hazardous Materials 364, no. : 78-81.

Journal article
Published: 01 January 2017 in Minerals Engineering
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ACS Style

Henrik Hansen; Andrea Lazo; Claudia Gutierrez; Manuel Durán; Pamela Lazo; Adrián Rojo. Continuous multistage electrodialytic treatment of copper smelter wastewater. Minerals Engineering 2017, 100, 187 -190.

AMA Style

Henrik Hansen, Andrea Lazo, Claudia Gutierrez, Manuel Durán, Pamela Lazo, Adrián Rojo. Continuous multistage electrodialytic treatment of copper smelter wastewater. Minerals Engineering. 2017; 100 ():187-190.

Chicago/Turabian Style

Henrik Hansen; Andrea Lazo; Claudia Gutierrez; Manuel Durán; Pamela Lazo; Adrián Rojo. 2017. "Continuous multistage electrodialytic treatment of copper smelter wastewater." Minerals Engineering 100, no. : 187-190.