PED47 Project
English (Engleză)
Project title: Photoactive carbon based nanocomposite materials for efficient wastewater treatment by organic pollutant removal
Periode: January 2017 - July 2018
Contact Person:
Project Director: Dr. E. György
Coordinator:
National Institute for Laser, Plasma and Radiation Physics - I.N.F.L.P.R.
Atomiștilor 409, Măgurele, Romania
Objectives:
The objective of the project is the development of new and environmentally friendly photoactive materials by laser techniques for photocatalytic applications. In the frame of previously financed projects, nanocomposite surface layers consisting of titanium dioxide nanoparticles, nano-carbon materials, and noble metal nanoparticles were synthesised by laser methods. The photocatalytic activity of the nanocomposite layers was investigated by monitoring the decomposition process of aqueous dye solutions under UV and UV-visible light irradiation. The scope of the present proposal is the validation of the existing technology concept developed in the frame of previous projects using an equipment which simulates the solar radiation and real atmospheric conditions. To this aim we use a professional photoreactor which allows the irradiation of the samples with the aid of a solar simulator. The system is equipped with built-in optical power and energy meters, as well as temperature controllers, reproducing real ambient conditions.
Phases and activities:
I) Project implementation period 03.01.2017-31.12.2017
1. Undoped and nitrogen doped graphene oxide (GO), zinc oxide (ZnO), and composite ZnO-GO thin layers were obtained by ultraviolet matrix assisted pulsed laser evaporation (UV-MAPLE) technique. A Nd: YAG (λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (BrillianQuantel, France) was used for irradiations. GO platelets and ZnO nanoparticles were uesd as starting materials.
2. The photocatalytic activity of the layers was investigated both under UV and visible light irradiation. The photocatalytic efficiency of the hybrid ZnO-GO layers was found to be higher as compared to pure ZnO or GO layers deposited under identical experimental conditions. The enhanced photocatalytic efficiency of the hybrid materials as compared to pure ZnO and GO layers was attributed to the synergistic effects between the constituent materials. The degradation efficiency of the hybrid layer was higher than the sum of the pure ZnO and GO layers’ efficiencies.
3. Under UV light irradiation, electron-hole pairs are generated on the surface of ZnO nanoparticles. The reduced GO platelets contribute to the reduction of the charge recombination rate through the effective separation and transport of the charge carriers, promoting the formation of hydroxyl and superoxide radicals, responsible for the oxidation and degradation of organic dye molecules.
4. Under visible light irradiation, with photon energies below the band gap of ZnO nanoparticles, the dye molecules act as first sensitizers in the degradation reactions.
5. The recyclability of the synthesized layers was also tested and correlated with the chemical structure of their surface. After consecutive degradation cycles, the hybrid photocatalyst layers were still stable and retained high degradation efficiency, ensuring reusability. It has been demonstrated that the loss of efficiency observed after the following degradation runs, besides possible mass loss, is related to the gradual transformation of ZnO to Zn(OH)2.
II) Project implementation period 01.01.2018-03.07.2018
6. Novel nanocomposite thin films consisting of titanium oxide (TiO2) - organic nitrogen containing molecules, TiO2-GO, and TiO2-GO-organic molecules were synthesized by UV-MAPLE technique with the aid of a Nd: YAG ( λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (Brilliant B, Quantel, France) laser source. GO platelets, TiO2 nanoparticles and organic powder materials were used as starting materials.
7. Thin layers of TiO2 nanoparticles and GO platelets were obtained spin-coating technique. The technique can be easily implemented in industrial processes for the large/scale production of hybrid layers.
8. The photocatalytic activity of the layers was investigated under simultaneous UV-visible light irradiation simulating the solar radiation. The photodegradation efficiency of the materials was tested through the degradation of organic dye solutions and real wastewater.
9. The photocatalytic efficiency of the ternary compounds was higher than the binary layers both in case of organic dye degradation as well as wastewater.
10. The degradation efficiency of TiO2 layers deposited by spin coating was improved through the inclusion of GO platelets.
11. The higher photodegradation efficiency was attributed to the charge separation and transport properties of reduced GO platelets and organic molecules.
12. Absorption of visible light radiation by the organic dye molecules contributes to the photodegradation process.
1. Undoped and nitrogen doped graphene oxide (GO), zinc oxide (ZnO), and composite ZnO-GO thin layers were obtained by ultraviolet matrix assisted pulsed laser evaporation (UV-MAPLE) technique. A Nd: YAG (λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (BrillianQuantel, France) was used for irradiations. GO platelets and ZnO nanoparticles were uesd as starting materials.
2. The photocatalytic activity of the layers was investigated both under UV and visible light irradiation. The photocatalytic efficiency of the hybrid ZnO-GO layers was found to be higher as compared to pure ZnO or GO layers deposited under identical experimental conditions. The enhanced photocatalytic efficiency of the hybrid materials as compared to pure ZnO and GO layers was attributed to the synergistic effects between the constituent materials. The degradation efficiency of the hybrid layer was higher than the sum of the pure ZnO and GO layers’ efficiencies.
3. Under UV light irradiation, electron-hole pairs are generated on the surface of ZnO nanoparticles. The reduced GO platelets contribute to the reduction of the charge recombination rate through the effective separation and transport of the charge carriers, promoting the formation of hydroxyl and superoxide radicals, responsible for the oxidation and degradation of organic dye molecules.
4. Under visible light irradiation, with photon energies below the band gap of ZnO nanoparticles, the dye molecules act as first sensitizers in the degradation reactions.
5. The recyclability of the synthesized layers was also tested and correlated with the chemical structure of their surface. After consecutive degradation cycles, the hybrid photocatalyst layers were still stable and retained high degradation efficiency, ensuring reusability. It has been demonstrated that the loss of efficiency observed after the following degradation runs, besides possible mass loss, is related to the gradual transformation of ZnO to Zn(OH)2.
II) Project implementation period 01.01.2018-03.07.2018
6. Novel nanocomposite thin films consisting of titanium oxide (TiO2) - organic nitrogen containing molecules, TiO2-GO, and TiO2-GO-organic molecules were synthesized by UV-MAPLE technique with the aid of a Nd: YAG ( λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (Brilliant B, Quantel, France) laser source. GO platelets, TiO2 nanoparticles and organic powder materials were used as starting materials.
7. Thin layers of TiO2 nanoparticles and GO platelets were obtained spin-coating technique. The technique can be easily implemented in industrial processes for the large/scale production of hybrid layers.
8. The photocatalytic activity of the layers was investigated under simultaneous UV-visible light irradiation simulating the solar radiation. The photodegradation efficiency of the materials was tested through the degradation of organic dye solutions and real wastewater.
9. The photocatalytic efficiency of the ternary compounds was higher than the binary layers both in case of organic dye degradation as well as wastewater.
10. The degradation efficiency of TiO2 layers deposited by spin coating was improved through the inclusion of GO platelets.
11. The higher photodegradation efficiency was attributed to the charge separation and transport properties of reduced GO platelets and organic molecules.
12. Absorption of visible light radiation by the organic dye molecules contributes to the photodegradation process.
Research Team:
• Dr. E. György
• Dr. A. Datcu
• PhD. student R. Ivan
• Dr. A. Datcu
• PhD. student R. Ivan
Română (Romanian)
Titlul proiectului: Photoactive carbon based nanocomposite materials for efficient wastewater treatment by organic pollutant removal
Perioada: Ianuarie 2017 - Iulie 2018
Persoana de contact:
Director Proiect: Dr. E. György
Coordonator:
Institutul Național pentru Fizica Laserilor, Plasmei și Radiației - I.N.F.L.P.R.
Atomiștilor 409, Măgurele, ROMÂNIA
Obiective:
The objective of the project is the development of new and environmentally friendly photoactive materials by laser techniques for photocatalytic applications. In the frame of previously financed projects, nanocomposite surface layers consisting of titanium dioxide nanoparticles, nano-carbon materials, and noble metal nanoparticles were synthesised by laser methods. The photocatalytic activity of the nanocomposite layers was investigated by monitoring the decomposition process of aqueous dye solutions under UV and UV-visible light irradiation. The scope of the present proposal is the validation of the existing technology concept developed in the frame of previous projects using an equipment which simulates the solar radiation and real atmospheric conditions. To this aim we use a professional photoreactor which allows the irradiation of the samples with the aid of a solar simulator. The system is equipped with built-in optical power and energy meters, as well as temperature controllers, reproducing real ambient conditions.
Etape și activități prevăzute:
I) Project implementation period 03.01.2017-31.12.2017
1. Undoped and nitrogen doped graphene oxide (GO), zinc oxide (ZnO), and composite ZnO-GO thin layers were obtained by ultraviolet matrix assisted pulsed laser evaporation (UV-MAPLE) technique. A Nd: YAG ( λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (BrillianQuantel, France) was used for irradiations. GO platelets and ZnO nanoparticles were uesd as starting materials.
2. The photocatalytic activity of the layers was investigated both under UV and visible light irradiation. The photocatalytic efficiency of the hybrid ZnO-GO layers was found to be higher as compared to pure ZnO or GO layers deposited under identical experimental conditions. The enhanced photocatalytic efficiency of the hybrid materials as compared to pure ZnO and GO layers was attributed to the synergistic effects between the constituent materials. The degradation efficiency of the hybrid layer was higher than the sum of the pure ZnO and GO layers’ efficiencies.
3. Under UV light irradiation, electron-hole pairs are generated on the surface of ZnO nanoparticles. The reduced GO platelets contribute to the reduction of the charge recombination rate through the effective separation and transport of the charge carriers, promoting the formation of hydroxyl and superoxide radicals, responsible for the oxidation and degradation of organic dye molecules.
4. Under visible light irradiation, with photon energies below the band gap of ZnO nanoparticles, the dye molecules act as first sensitizers in the degradation reactions.
5. The recyclability of the synthesized layers was also tested and correlated with the chemical structure of their surface. After consecutive degradation cycles, the hybrid photocatalyst layers were still stable and retained high degradation efficiency, ensuring reusability. It has been demonstrated that the loss of efficiency observed after the following degradation runs, besides possible mass loss, is related to the gradual transformation of ZnO to Zn(OH)2.
II) Project implementation period 01.01.2018-03.07.2018
6. Novel nanocomposite thin films consisting of titanium oxide (TiO2) - organic nitrogen containing molecules, TiO2-GO, and TiO2-GO-organic molecules were synthesized by UV-MAPLE technique with the aid of a Nd: YAG ( λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (Brilliant B, Quantel, France) laser source. GO platelets, TiO2 nanoparticles and organic powder materials were used as starting materials.
7. Thin layers of TiO2 nanoparticles and GO platelets were obtained spin-coating technique. The technique can be easily implemented in industrial processes for the large/scale production of hybrid layers.
8. The photocatalytic activity of the layers was investigated under simultaneous UV-visible light irradiation simulating the solar radiation. The photodegradation efficiency of the materials was tested through the degradation of organic dye solutions and real wastewater.
9. The photocatalytic efficiency of the ternary compounds was higher than the binary layers both in case of organic dye degradation as well as wastewater.
10. The degradation efficiency of TiO2 layers deposited by spin coating was improved through the inclusion of GO platelets.
11. The higher photodegradation efficiency was attributed to the charge separation and transport properties of reduced GO platelets and organic molecules.
12. Absorption of visible light radiation by the organic dye molecules contributes to the photodegradation process.
1. Undoped and nitrogen doped graphene oxide (GO), zinc oxide (ZnO), and composite ZnO-GO thin layers were obtained by ultraviolet matrix assisted pulsed laser evaporation (UV-MAPLE) technique. A Nd: YAG ( λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (BrillianQuantel, France) was used for irradiations. GO platelets and ZnO nanoparticles were uesd as starting materials.
2. The photocatalytic activity of the layers was investigated both under UV and visible light irradiation. The photocatalytic efficiency of the hybrid ZnO-GO layers was found to be higher as compared to pure ZnO or GO layers deposited under identical experimental conditions. The enhanced photocatalytic efficiency of the hybrid materials as compared to pure ZnO and GO layers was attributed to the synergistic effects between the constituent materials. The degradation efficiency of the hybrid layer was higher than the sum of the pure ZnO and GO layers’ efficiencies.
3. Under UV light irradiation, electron-hole pairs are generated on the surface of ZnO nanoparticles. The reduced GO platelets contribute to the reduction of the charge recombination rate through the effective separation and transport of the charge carriers, promoting the formation of hydroxyl and superoxide radicals, responsible for the oxidation and degradation of organic dye molecules.
4. Under visible light irradiation, with photon energies below the band gap of ZnO nanoparticles, the dye molecules act as first sensitizers in the degradation reactions.
5. The recyclability of the synthesized layers was also tested and correlated with the chemical structure of their surface. After consecutive degradation cycles, the hybrid photocatalyst layers were still stable and retained high degradation efficiency, ensuring reusability. It has been demonstrated that the loss of efficiency observed after the following degradation runs, besides possible mass loss, is related to the gradual transformation of ZnO to Zn(OH)2.
II) Project implementation period 01.01.2018-03.07.2018
6. Novel nanocomposite thin films consisting of titanium oxide (TiO2) - organic nitrogen containing molecules, TiO2-GO, and TiO2-GO-organic molecules were synthesized by UV-MAPLE technique with the aid of a Nd: YAG ( λ = 266 nm, τFWHM = 3 ns, υ = 10 Hz) (Brilliant B, Quantel, France) laser source. GO platelets, TiO2 nanoparticles and organic powder materials were used as starting materials.
7. Thin layers of TiO2 nanoparticles and GO platelets were obtained spin-coating technique. The technique can be easily implemented in industrial processes for the large/scale production of hybrid layers.
8. The photocatalytic activity of the layers was investigated under simultaneous UV-visible light irradiation simulating the solar radiation. The photodegradation efficiency of the materials was tested through the degradation of organic dye solutions and real wastewater.
9. The photocatalytic efficiency of the ternary compounds was higher than the binary layers both in case of organic dye degradation as well as wastewater.
10. The degradation efficiency of TiO2 layers deposited by spin coating was improved through the inclusion of GO platelets.
11. The higher photodegradation efficiency was attributed to the charge separation and transport properties of reduced GO platelets and organic molecules.
12. Absorption of visible light radiation by the organic dye molecules contributes to the photodegradation process.
Echipa de cercetare:
• Dr. E. György
• Dr. A. Datcu
• Doctorand R. Ivan
• Dr. A. Datcu
• Doctorand R. Ivan
RESULTS:
Publications:
[1] I. Camps, R. Serna, M. Borlaf, M. T. Colomer, R. Moreno, C. Logofatu, L. Duta, C. Nita, A. Perez del Pino, E. György, Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols, RSC Advances, 7 (2017) 37643–37653;
[2] A. Queralto, A. Perez del Pino, C. Logofatu, A. Datcu, R. Amade, I. Alshaikh, E. Bertran, I. Urzica, E. György, MAPLE synthesis of reduced graphene oxide/silver nanocomposite electrodes: Influence of target composition and gas ambience, Journal of Alloys Compounds, 726 (2017) 1003-1013;
[3] E. György, C. Logofatu, Á. Pérez del Pino, A. Datcu, O. Pascu, R. Ivan, Enhanced UV- and visible-light driven photocatalytic performances and recycling properties of graphene oxide/ZnO hybrid layers, Ceramics International, 44 (2018) 1826–1835;
[4] A. Datcu, M.L. Mendoza, A. Pérez del Pino, C. Logofatu, C. Luculescu, E. György, UV–vis light induced photocatalytic activity of TiO2/graphene oxide nanocomposite coatings, Catalysis Today, in proofs, https://doi.org/10.1016/j.cattod.2018.02.026 ;
[5] R. Ivan, A. Pérez del Pino, C. Logofatu, E. György, Reduced graphene oxide/titanium oxide/ urea composite layers for photocatalytic degradation of organic dyes and antibiotics in aqueous medium, RSC Advances, submitted for publication.
Publications:
[1] I. Camps, R. Serna, M. Borlaf, M. T. Colomer, R. Moreno, C. Logofatu, L. Duta, C. Nita, A. Perez del Pino, E. György, Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols, RSC Advances, 7 (2017) 37643–37653;
[2] A. Queralto, A. Perez del Pino, C. Logofatu, A. Datcu, R. Amade, I. Alshaikh, E. Bertran, I. Urzica, E. György, MAPLE synthesis of reduced graphene oxide/silver nanocomposite electrodes: Influence of target composition and gas ambience, Journal of Alloys Compounds, 726 (2017) 1003-1013;
[3] E. György, C. Logofatu, Á. Pérez del Pino, A. Datcu, O. Pascu, R. Ivan, Enhanced UV- and visible-light driven photocatalytic performances and recycling properties of graphene oxide/ZnO hybrid layers, Ceramics International, 44 (2018) 1826–1835;
[4] A. Datcu, M.L. Mendoza, A. Pérez del Pino, C. Logofatu, C. Luculescu, E. György, UV–vis light induced photocatalytic activity of TiO2/graphene oxide nanocomposite coatings, Catalysis Today, in proofs, https://doi.org/10.1016/j.cattod.2018.02.026 ;
[5] R. Ivan, A. Pérez del Pino, C. Logofatu, E. György, Reduced graphene oxide/titanium oxide/ urea composite layers for photocatalytic degradation of organic dyes and antibiotics in aqueous medium, RSC Advances, submitted for publication.
Conference presentations:
[1] A. Datcu, Photocatalytic semiconductors based nanocomposite materials synthesized by laser techniques, Oral presentation, The 6th International Conference Ecological & Environmental Chemistry 2017, Chisinau, Moldova;
[2] A. Datcu, O. Pascu, R. M. Ivan, C. Logofatu, A. Pérez del Pino, E. György, MAPLE transfer and immobilization of ZnO/graphene oxide nanocomposites for photocatalytic applications, Poster presentation, E-MRS Spring Meeting 2017, Strasbourg, France;
[3] A. Datcu, A. Queraltó, C. Logofatu, A. Pérez del Pino, E. György, Photocatalytic iron oxide / graphene oxide nanocomposite material synthesized by laser techniques, Poster presentation, E-MRS Spring Meeting 2017, Strasbourg, France.