Optimizacija heterogene fotokatalize v šaržnem reaktorju z reciklom

Črv, Špela (author), Plazl, Igor (mentor)

V šaržnem reaktorju z reciklom smo izvedli teste aktivnosti imobiliziranih fotokatalizatorjev TiO2 in plazmonskih fotokatalizatorjev Au/TiO2 za oksidativno razgradnjo raztopljenega bisfenola A (BPA). Kot osnovni material za fotokatalizatorje smo uporabili komercialno dostopne nanodelce TiO2, na katere smo s pomočjo mokre impregnacije nanesli 1 ut. % Au. Oksidativno razgradnjo smo izvedli pri treh različnih hitrostih pretoka ob osvetljevanju z ultravijolično (UV) in vidno (VIS) pri dveh vrstah fotokatalizatorjev, TiO2 in Au/TiO2. Vsak tip fotokatalizatorja je bil imobiliziran na dva načina: z nanosom s potapljanjem (angl. dip coater) ali z nanosom z vrtenjem (angl. spin coater). Učinkovitost oksidativne razgradnje BPA smo spremljali s pomočjo tekočinske kromatografije visoke ločljivosti (angl. high precision liquid cromatography, HPLC) z UV diodnim detektorjem. Najboljšo razgradnjo smo dosegli s fotokatalizatorjem Au/TiO2, ki je bil nanešen z nanosom z vrtenjem ob osvetljevanju z UV svetlobo in pretokom 60 mL/min. Relativna koncentracija BPA je padla za 52,4 %. Stopnjo mineralizacije BPA smo določili s pomočjo analize celotnega organskega ogljika (angl. total carbon analysis, TOC). Ta je prav tako bila najvišja pri oksidativni razgradnji s fotokatalizatorjem Au/TiO2, ki je bil nanešen z nanosom z vrtenjem ob osvetljevanju z UV svetlobo in pretokom 60 mL/min. Odstotek celotnega odstranjenega organskega ogljika je bil 51 %.

• Language: Slovenian
• Keywords: heterogena fotokataliza, TiO2, bisfenol A, vidna svetloba, Au/TiO2
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2021
• PID: 20.500.12556/RUL-129931
• COBISS.SI-ID: 81790979
• Publication date in RUL: 09.09.2021

Secondary language

• Language: English
• Title: Optimization of heterogeneous photocatalysis in a batch reactor with recycling

Abstract

Activity tests of immobilized TiO2 photocatalysts and Au/TiO2 plasmon photocatalysts for oxidative degradation of dissolved bisphenol A (BPA) were performed in a batch reactor with recirculation. Commercially available TiO2 nanoparticles were used as the base material for the photocatalysts, to which 1 wt. % Au was added by wet impregnation. Oxidative degradation was performed at three different flow rates under ultraviolet (UV) and visible (VIS) light on two types of immobilized photocatalysts, TiO2 and Au/TiO2. Each type of photocatalyst was immobilized in two ways, either by dip coater or spin coater. The efficiency of oxidative degradation of BPA was monitored using high precision liquid cromatography (HPLC) with a UV diode detector. The best degradation was achieved with spin coater immobolized Au/TiO2 photocatalyst under UV light and a flow rate of 60 mL/min. The relative concentration of BPA fell by 52.4%. The degree of BPA mineralization was determined using total carbon analysis (TOC). The highest percentage of total organic carbon removed was 51 % and was also achieved with oxidative degradation of BPA with spin coater immobolized Au/TiO2 photocatalyst under UV light and a flow rate of 60 mL/min.

• Keywords: heterogenous photocatalysis, TiO2, bisphenol A, visible light, Au/TiO2