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    PozycjaOpen Access
    A new magnetic-hybrid photoreactor for photocatalytic water disinfection
    (Polska Akademia Nauk, 2023-07-14) Paszkiewicz, Oliwia; Wang, Kunlei; Kordas, Marian; Rakoczy, Rafał; Kowalska, Ewa; Markowska-Szczupak, Agata; West Pomeranian University of Technology in Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical and Process Engineering, Piastow 42, 71-065 Szczecin, Poland; Hokkaido University, Institute for Catalysis (ICAT), N21, W9, 001-0021 Sapporo, Japan; West Pomeranian University of Technology in Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical and Process Engineering, Piastow 42, 71-065 Szczecin, Poland; West Pomeranian University of Technology in Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical and Process Engineering, Piastow 42, 71-065 Szczecin, Poland; Hokkaido University, Institute for Catalysis (ICAT), N21, W9, 001-0021 Sapporo, Japan; Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Krakow, Poland; West Pomeranian University of Technology in Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical and Process Engineering, Piastow 42, 71-065 Szczecin, Poland
    In this research, the removal of model gram-negative bacteria Escherichia coli and gram-positive Staphylococcus epidermidis bacteria from aqueous solutions using copper-modified titania 0.5Cu@HomoP25, 2.0Cu @HomoP25, 5.0Cu@HomoP25 in new hybrid photoreactor assisted with rotating magnetic field (RMF) was evaluated. Therefore, the analysis of variance (ANOVA) test was employed to design the experiments and to determine the optimal conditions. The effects of various parameters such as copper concentration [% w/w], time [h] and frequency of RMF [Hz] were studied. Results: Analysis of variance (ANOVA), revealed a good agreement between experimental data and the proposed quadratic polynomial model (R2=0.86 for E. coli and R2=0.69 for S. epidermidis). Experimental results showed that with increasing copper concentration, time, and decreasing frequency of RMF removal efficiency was increased. Accordingly, the water disinfection efficiency of 100% in the regression method of the independent variables: for E. coli bacteria: c = 5 %; t = 3 h; f = 50 Hz, and for S. epidermidis c = 2.5 %; t = 1.3 h; f = 26.6 Hz were optimized. This study showed that the nonlinear regression method is a useful tool for optimizing the operating parameters for the photocatalytic disinfection process.