TY  - JOUR
AU  - Paulista, Larissa O.
AU  - Ferreira, Alexandre F. P.
AU  - Castanheira, Bruna
AU  - Đolić, Maja B.
AU  - Martins, Ramiro J. E.
AU  - Boaventura, Rui A. R.
AU  - Vilar, Vítor J. P.
AU  - Silva, Tânia F. C. V.
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6622
AB  - A new hybrid catalyst composed of mesostructured silica SBA-15 functionalized with TiO2 and further loaded with RuO2 was developed to efficiently promote thermo-photocatalytic CO2 hydrogenation into methane at low temperatures. The catalytic activity was assessed with respect to TiO2:RuO2 loading, catalyst dosage, illumination source (polychromatic sunlight and monochromatic LEDs) and power, [H2]:[CO2] molar ratio, temperature, and catalyst reusability. The best methanation yields were attained for the RuO2(6.4%):TiO2(16.9%)/SBA-15 nanocomposite at 150 ºC, under simulated sunlight (0.21 W) and stoichiometric [H2]:[CO2] molar ratio, reaching: a specific CH4 production rate of 13.6 mmol gcat-1 h-1; 99.8 % selectivity; 96.8 % CO2 conversion (110-min; 40 mL); and apparent photonic efficiency/quantum yield of 39.5 %/42.1 %. Considering only the active RuO2:TiO2 photocatalyst mass (23.3 %), the CH4 production rate increased to 58.6 mmol gactive_cat-1 h-1. Besides, this highly-active photocatalyst featured excellent UV-Vis-IR light absorbance, high surface area, and stability for reuse when moist gas was removed between cycles.
PB  - Elsevier B.V.
T2  - Applied Catalysis B: Environmental
T1  - Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/SBA-15 nanocomposite at low temperature
SP  - 123232
VL  - 340
DO  - 10.1016/j.apcatb.2023.123232
ER  - 

@article{
author = "Paulista, Larissa O. and Ferreira, Alexandre F. P. and Castanheira, Bruna and Đolić, Maja B. and Martins, Ramiro J. E. and Boaventura, Rui A. R. and Vilar, Vítor J. P. and Silva, Tânia F. C. V.",
year = "2024",
abstract = "A new hybrid catalyst composed of mesostructured silica SBA-15 functionalized with TiO2 and further loaded with RuO2 was developed to efficiently promote thermo-photocatalytic CO2 hydrogenation into methane at low temperatures. The catalytic activity was assessed with respect to TiO2:RuO2 loading, catalyst dosage, illumination source (polychromatic sunlight and monochromatic LEDs) and power, [H2]:[CO2] molar ratio, temperature, and catalyst reusability. The best methanation yields were attained for the RuO2(6.4%):TiO2(16.9%)/SBA-15 nanocomposite at 150 ºC, under simulated sunlight (0.21 W) and stoichiometric [H2]:[CO2] molar ratio, reaching: a specific CH4 production rate of 13.6 mmol gcat-1 h-1; 99.8 % selectivity; 96.8 % CO2 conversion (110-min; 40 mL); and apparent photonic efficiency/quantum yield of 39.5 %/42.1 %. Considering only the active RuO2:TiO2 photocatalyst mass (23.3 %), the CH4 production rate increased to 58.6 mmol gactive_cat-1 h-1. Besides, this highly-active photocatalyst featured excellent UV-Vis-IR light absorbance, high surface area, and stability for reuse when moist gas was removed between cycles.",
publisher = "Elsevier B.V.",
journal = "Applied Catalysis B: Environmental",
title = "Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/SBA-15 nanocomposite at low temperature",
pages = "123232",
volume = "340",
doi = "10.1016/j.apcatb.2023.123232"
}

Paulista, L. O., Ferreira, A. F. P., Castanheira, B., Đolić, M. B., Martins, R. J. E., Boaventura, R. A. R., Vilar, V. J. P.,& Silva, T. F. C. V.. (2024). Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/SBA-15 nanocomposite at low temperature. in Applied Catalysis B: Environmental
Elsevier B.V.., 340, 123232.
https://doi.org/10.1016/j.apcatb.2023.123232

Paulista LO, Ferreira AFP, Castanheira B, Đolić MB, Martins RJE, Boaventura RAR, Vilar VJP, Silva TFCV. Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/SBA-15 nanocomposite at low temperature. in Applied Catalysis B: Environmental. 2024;340:123232.
doi:10.1016/j.apcatb.2023.123232 .

Paulista, Larissa O., Ferreira, Alexandre F. P., Castanheira, Bruna, Đolić, Maja B., Martins, Ramiro J. E., Boaventura, Rui A. R., Vilar, Vítor J. P., Silva, Tânia F. C. V., "Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/SBA-15 nanocomposite at low temperature" in Applied Catalysis B: Environmental, 340 (2024):123232,
https://doi.org/10.1016/j.apcatb.2023.123232 . .

TY  - JOUR
AU  - Andrade, Deborah C.
AU  - Đolić, Maja B.
AU  - Martínez-Huitle, Carlos A.
AU  - dos Santos, Elisama V.
AU  - Silva, Tânia F.C.V.
AU  - Vilar, Vítor J.P.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5316
AB  - This work proposes an eco-efficient treatment technology for the remediation of a kaolinite-based clay soil artificially contaminated with hexavalent chromium (50 mg Cr(VI) kg–1 soil), combining electrokinetics (EK) with permeable reactive barriers (PRB) composed of cork granules, the major by-product of cork stoppers production. This 100% natural and sustainable material can act as (i) an electron donor in the Cr(VI) reduction into trivalent chromium [Cr(III)], the less toxic state, and as (ii) a binder for the reduced Cr(III) on its pre-oxidized surface. The EK and Cr(VI) reduction efficiencies were assessed over 15 days as a function of the: (i) supporting electrolyte solution (demineralized water – DW, tap water, citric acid – CA, and sodium chloride – NaCl); and (ii) cork-PRB inclusion and position (near the anodic compartment, using direct current, or in the soil middle section, applying reversal polarity). Results showed that DW was the best supporting electrolyte solution, removing about 33% of total chromium (CrT) from the soil towards the anode, mainly under the Cr(VI) form, even though CA and NaCl presented higher electrical conductivity. Besides, nearly 67% Cr(VI) was reduced into less mobile Cr(III) only by soil-borne electron donor constituents, especially iron (> 6 g kg–1), which impaired the overall Cr migration due to the Cr(III) precipitation/adsorption over/onto the soil. Such reaction was boosted by CA and NaCl electrolytes, which increased H+ ions availability, reaching reduction efficiencies higher than 98%. When the cork-PRB was incorporated into the DW-driven EK process near the anode, the best position owing to the low pH, the Cr(VI) reduction and CrT removal efficiencies improved to about 97% and 42%, respectively. Furthermore, virtually no Cr(VI) migrated to the anolyte/catholyte, and less than 2% Cr(III) was found in the anodic chamber, being c.a. 40% of CrT retained in the cork-PRB as Cr(III) and c.a. 3%/55% of Cr(VI)/Cr(III) into the soil. Notwithstanding, the EK-PRB process can render polluted soil somewhat less dangerous and prevent the spreading of contamination to natural aquifers.
PB  - Elsevier Ltd.
T2  - Electrochimica Acta
T1  - Coupling electrokinetic with a cork-based permeable reactive barrier to prevent groundwater pollution: A case study on hexavalent chromium-contaminated soil
SP  - 140936
VL  - 429
DO  - 10.1016/j.electacta.2022.140936
ER  - 

@article{
author = "Andrade, Deborah C. and Đolić, Maja B. and Martínez-Huitle, Carlos A. and dos Santos, Elisama V. and Silva, Tânia F.C.V. and Vilar, Vítor J.P.",
year = "2022",
abstract = "This work proposes an eco-efficient treatment technology for the remediation of a kaolinite-based clay soil artificially contaminated with hexavalent chromium (50 mg Cr(VI) kg–1 soil), combining electrokinetics (EK) with permeable reactive barriers (PRB) composed of cork granules, the major by-product of cork stoppers production. This 100% natural and sustainable material can act as (i) an electron donor in the Cr(VI) reduction into trivalent chromium [Cr(III)], the less toxic state, and as (ii) a binder for the reduced Cr(III) on its pre-oxidized surface. The EK and Cr(VI) reduction efficiencies were assessed over 15 days as a function of the: (i) supporting electrolyte solution (demineralized water – DW, tap water, citric acid – CA, and sodium chloride – NaCl); and (ii) cork-PRB inclusion and position (near the anodic compartment, using direct current, or in the soil middle section, applying reversal polarity). Results showed that DW was the best supporting electrolyte solution, removing about 33% of total chromium (CrT) from the soil towards the anode, mainly under the Cr(VI) form, even though CA and NaCl presented higher electrical conductivity. Besides, nearly 67% Cr(VI) was reduced into less mobile Cr(III) only by soil-borne electron donor constituents, especially iron (> 6 g kg–1), which impaired the overall Cr migration due to the Cr(III) precipitation/adsorption over/onto the soil. Such reaction was boosted by CA and NaCl electrolytes, which increased H+ ions availability, reaching reduction efficiencies higher than 98%. When the cork-PRB was incorporated into the DW-driven EK process near the anode, the best position owing to the low pH, the Cr(VI) reduction and CrT removal efficiencies improved to about 97% and 42%, respectively. Furthermore, virtually no Cr(VI) migrated to the anolyte/catholyte, and less than 2% Cr(III) was found in the anodic chamber, being c.a. 40% of CrT retained in the cork-PRB as Cr(III) and c.a. 3%/55% of Cr(VI)/Cr(III) into the soil. Notwithstanding, the EK-PRB process can render polluted soil somewhat less dangerous and prevent the spreading of contamination to natural aquifers.",
publisher = "Elsevier Ltd.",
journal = "Electrochimica Acta",
title = "Coupling electrokinetic with a cork-based permeable reactive barrier to prevent groundwater pollution: A case study on hexavalent chromium-contaminated soil",
pages = "140936",
volume = "429",
doi = "10.1016/j.electacta.2022.140936"
}

Andrade, D. C., Đolić, M. B., Martínez-Huitle, C. A., dos Santos, E. V., Silva, T. F.C.V.,& Vilar, V. J.P.. (2022). Coupling electrokinetic with a cork-based permeable reactive barrier to prevent groundwater pollution: A case study on hexavalent chromium-contaminated soil. in Electrochimica Acta
Elsevier Ltd.., 429, 140936.
https://doi.org/10.1016/j.electacta.2022.140936

Andrade DC, Đolić MB, Martínez-Huitle CA, dos Santos EV, Silva TF, Vilar VJ. Coupling electrokinetic with a cork-based permeable reactive barrier to prevent groundwater pollution: A case study on hexavalent chromium-contaminated soil. in Electrochimica Acta. 2022;429:140936.
doi:10.1016/j.electacta.2022.140936 .

Andrade, Deborah C., Đolić, Maja B., Martínez-Huitle, Carlos A., dos Santos, Elisama V., Silva, Tânia F.C.V., Vilar, Vítor J.P., "Coupling electrokinetic with a cork-based permeable reactive barrier to prevent groundwater pollution: A case study on hexavalent chromium-contaminated soil" in Electrochimica Acta, 429 (2022):140936,
https://doi.org/10.1016/j.electacta.2022.140936 . .