Highly Active TiO2 Photocatalysts for Hydrogen Production through a Combination of Commercial TiO2 Material Selection and Platinum Co-Catalyst Deposition Using a Colloidal Approach with Green Reductants

Catalysts

卷:11

Minoo Tasbihi¹  Charly Klingbeil¹  Edith Mawunya Kutorglo¹  Riny Yolandha Parapat¹  Michael Schwarze¹  Ha Uyen Do¹ 

[1] Department of Chemistry, Technische Universität Berlin, Straße des 17, Juni 124, 10623 Berlin, Germany;

关键词: commercial titania;    green reductant;    Pt nanoparticles;    hydrogen production;    co-catalyst;   

DOI  :  10.3390/catal11091027

来源: DOAJ

【 摘 要 】

In this contribution, four different commercial TiO₂ catalysts (P25, P90, PC105, and PC500) were screened for the photocatalytic production of hydrogen using ethanol as the sacrificial agent. The physico-chemical properties of the TiO₂ powders were characterized by using different methods. The photocatalysts mainly vary in the ratio of anatase and rutile phases, and in the surface area. It was found that the photocatalytic activity is governed by the surface area of the photocatalyst. Pure TiO_2,PC500 showed the best performance, and in comparison to P25, the activity was more than twenty times higher due to its high surface area of about 270 m² g⁻¹. For further improvement of the photocatalytic activity, platinum nanoparticles (PtNPs) were immobilized onto TiO_2,PC500 using two methods: a colloidal approach and a photodeposition method. For the reduction of the platinum salt precursor in the colloidal approach, different green reducing agents were used in comparison to ascorbic acid. The obtained platinum nanoparticles using natural reductants showed a higher photocatalytic activity due to the formation of smaller nanoparticles, as proven by transmission electron microscopy (TEM). The highest activity was obtained when mangosteen was used as the green reducing agent. Compared to ascorbic acid as a classical reducing agent, the photocatalytic activity of the Pt@TiO_2,PC500 prepared with mangosteen was about 2–3 times higher in comparison to other as-prepared photocatalysts. The Pt@TiO_2,PC500 catalyst was further studied under different operating conditions, such as catalyst and sacrificial agent concentration.

【 授权许可】

Unknown