ฉันรักแปลIn this study the efficien

ฉันรักแปลIn this study the efficiency of different bare, doped and composite photocatalysts were compared, under UV and visible light irradiation in order to show a detailed picture of the relative performance of the best photocatalysts developed in our laboratories and the mostly investigated reference titanias. The syntheses of our photocatalysts were optimized in order to achieve maximum photocatalytic activity under UV and visible light irradiation. Non doped commercial (Aeroxide P25, Aldrich anatase) and synthesized titanias (produced by sol–gel and flame hydrolysis techniques) and nitrogen, iron, iodine doped and silver or gold deposited titanium dioxides were investigated with two model pollutants (phenol and oxalic acid) under identical experimental conditions. The material properties of these selected photocatalysts were thoroughly characterized by X-ray diffraction, diffuse reflectance spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray fluorescence spectroscopy and BET methods. The highest degradation rate of phenol was determined for the flame made titania sample with relatively low specific surface area (20 m2/g) when UV irradiation was applied. In contrast with that, our nitrogen doped photocatalyst with high specific surface area (139 m2/g) was the best for phenol degradation under visible light irradiation. Although the most efficient oxalic acid mineralization occurred with noble metal photodeposited samples under UV irradiation, this type of modification was detrimental when VIS irradiation is applied. The decomposition rate of oxalic acid was high under VIS irradiation using the iron and nitrogen doped photocatalysts. For both substrates and irradiation conditions our best photocatalysts were found to be significantly more active than Aeroxide P25 TiO2. Intermediate studies revealed that phenol degradation resulted in dihydroxy benzene intermediates, such as pyrocatechol and hydroquinone both under UV and visible light irradiation with our TiO2-N photocatalyst. The results of this comparative study could promote the determination of the optimal synthesis conditions of titanium dioxide based photocatalysts for a given organic pollutant in water.

ผลลัพธ์ (แอฟริกา) 1:

Ek is lief vertaling In hierdie studie is die doeltreffendheid van verskillende kaal, gedoteer en saamgestelde foto-katalysatoren is vergelyk, onder UV en sigbare lig bestraling om 'n volledige prentjie van die relatiewe prestasie van die beste foto-katalysatoren ontwikkel in ons laboratoriums en die meestal ondersoek verwysing titanias wys. . Die sintese van ons foto-katalysatoren is new om maksimum fotokatalitiese aktiwiteit onder UV en sigbare lig bestraling bereik. Nie gedoopte kommersiële (Aeroxide P25, Aldrich anatase) en gesintetiseer titanias (vervaardig deur Sol-gel en vlam hidrolise tegnieke) en stikstof, yster. , jodium gedoopte en silwer of goud gedeponeer titanium dioxides ondersoek met twee model besoedelingstowwe (fenol en oksaalsuur) onder identiese eksperimentele toestande. Die materiaal eienskappe van hierdie geselekteerde foto-katalysatoren is deeglik gekenmerk deur X-straaldiffraksie, diffuse reflektansie spektroskopie, transmissie-elektronmikroskopie. , X-straal-foto-elektron spektroskopie, X-straal-fluoressensie spektroskopie en BET metodes. Die hoogste agteruitgang koers van fenol bepaal vir die vlam gemaak Titania monster met 'n relatief lae spesifieke oppervlakte (20 m2 / g) wanneer UV bestraling toegepas. In kontras. met wat, ons stikstof gedoopte photocatalyst met 'n hoë spesifieke oppervlakte (139 m2 / g) was die beste vir fenol agteruitgang onder sigbare lig bestraling. Hoewel die mees doeltreffende oksaalsuur mineralisasie plaasgevind het met edele metaal photodeposited monsters onder UV bestraling, hierdie tipe van verandering. was nadelig wanneer VIS bestraling toegepas word. Die ontbinding koers van oksaalsuur is hoog onder VIS bestraling met behulp van die yster en stikstof gedoopte foto-katalysatoren. Vir beide substrate en bestraling voorwaardes ons beste foto-katalysatoren gevind aansienlik meer aktief as Aeroxide P25 TiO2 te wees. Intermediêre studies. die lig gebring dat fenol agteruitgang tot gevolg gehad dihydroxy benseen middel, soos pyrocatechol en hidrokinoon albei onder UV en sigbare lig bestraling met ons TiO2-N photocatalyst. Die resultate van hierdie vergelykende studie kon die bepaling van die optimale toestande sintese van titaandioksied gebaseer foto-katalysatoren vir bevorder. 'n gegewe organiese stowwe in water.