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1887. Photocatalytic CO2 reduction over mesoporous TiO2 photocatalystsMartin Reli, Peter Nadrah, Miroslava Filip Edelmannová, Rudolf Ricka, Andrijana Sever Škapin, Urška Lavrenčič Štangar, Kamila Kočí, 2024, original scientific article Abstract: In this study, we investigated different synthesis methods (template-free and template-based) using copolymers of poly(ethylene oxide) and poly(propylene oxide) to enhance the CO2 reduction activity of mesoporous TiO2. Our main goal was to identify key factors affecting photocatalyst efficiency and selectivity. We compared the newly synthesized TiO2 photocatalysts with the commercial photocatalyst P25. Among the materials studied, TiO2-P123 in its pure anatase form demonstrated the highest photoreduction efficiency and CO2 selectivity. In contrast, TiO2-EG, TiO2-F127, and P25, which contained both rutile and anatase phases, exhibited decreased photoactivity due to the formation of a type II heterojunction between the phases and higher oxygen adsorption on rutile's surface. Additionally, we observed that the choice of chemicals for photocatalyst preparation significantly influenced the specific surface area. TiO2-P123, the most active photocatalyst, had the highest specific surface area, providing more reactive sites for improved light absorption efficiency and prolonged electron-hole pair lifetimes, resulting in enhanced photocatalytic activity. We also calculated apparent quantum yields to support our findings.
Keywords: CO2 reduction, TiO2, photocatalysis, mesoporous material, Sol-gel method
Published in DiRROS: 14.11.2023; Views: 506; Downloads: 56
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1890. Analiza stanja, težave z obnovo in usmeritve za gospodarjenje z borovimi sestoji v južnem delu GGO TolminAmbrož Blažko, 2023, professional article Abstract: V članku so predstavljeni rezultati digitalizacije površin borovih sestojev v južnem delu gospodarskega območja (GGO) Tolmin iz leta 1963 in primerjava stanja omenjenih gozdnih sestojev leta 1963 in dandanes. Podatki o stanju sestojev so razdeljeni v tri kategorije. Borovi sestoji, starejši od 60 let (nastali pred letom 1963), nekdanji borovi sestoji, kjer je že bila narejena premena, in mlajši borovi sestoji (do 60 let). Na splošno se je površina borovih sestojev v tem obdobju od leta 1963 do zdaj zmanjšala. Starost sestojev kaže, da je večina že dosegla sečno zrelost. Bori so marsikje opravili svoje poslanstvo predkulture. V mladju se pojavljajo toploljubni listavci. Zato so mnogi sestoji že primerni za posek (premeno), saj se njihova vitalnost in kakovost zmanjšujeta. Prav tako so požarno ogroženi.
Keywords: borovi sestoji, premena, toploljubni listavci, pomlajevanje, starostna struktura
Published in DiRROS: 14.11.2023; Views: 423; Downloads: 157
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