Photoactive carbon based nanocomposite materials for efficient wastewater treatment by organic pollutant removal










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.






-Laser processing:


-Nd:YAG solid state laser source Brilliant B from Quantel, France, with 1064 nm, 532 nm, and 266 nm emission wavelengths

-Laser pulse energy control and measurement system from Gentec Electro-Optics, Canada

-CCD camera and optical elements from Melles Griot and Thorlabs

-laser beam homogenizer from Bayerisches Laserzentrum GmbH, Germany

-micrometric XYZ positioning table with control unit

-computers and software for automated processing


-Sample characterization techniques:

-UV-Vis spectrophotometer from Shimadzu, Japan

-high sensitive DC and pulsed electrical measurements: two- and four-probe micro-electrical measurements probe station from Everbeing, equipped with 4 tip micro-positioners, stereomicroscope, sample holder with vacuum chunk, and Keithley 2612A double source-meter system

-photoreactor from LuzChem, Canada, equipped with lamps emitting in the UV and visible spectral ranges, simulating the solar radiation

-Computing workstation for numerical simulations of laser-material interaction processes




Results dissemination


Publications in ISI quoted journals:


1. I. Camps, R. Serna, M. Borlaf, M. T. Colomer, R. Moreno, C. Logofatu, L. Duta, C. Nita, A. Perez del Pino, E. Gyorgy: "Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols", RSC Advances, 7 (2017) 37643-37653, IF=3.108


2. A. Queralto, A. Perez del Pino, C. Logofatu, A. Datcu, R. Amade, I. Alshaikh, E. Bertran, I. Urzica, E. Gyorgy: "MAPLE synthesis of reduced graphene oxide/silver nanocomposite electrodes: Influence of target composition and gas ambience", Journal of Alloys Compounds, 726 (2017) 1003-1013, IF=3.133


3. E. Gyorgy, C. Logofatu, A. Perez 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 in proofs,, IF=2.986




International conferences:


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. Perez del Pino, E. Gyorgy, "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. Queralto, C. Logofatu, A. Perez del Pino, E. Gyorgy, "Photocatalytic iron oxide / graphene oxide nanocomposite material synthesized by laser techniques", Poster presentation, E-MRS Spring Meeting 2017, Strasbourg, France