Kinetic investigation of para -nitrophenol reduction with photodeposited platinum nanoparticles onto tunicate cellulose

• Published in: RSC advances Vol. 12; no. 48; pp. 30860 - 30870
• Main Authors: Thiel, T. A., Zhang, X., Radhakrishnan, B., van de Krol, R., Abdi, F. F., Schroeter, M., Schomäcker, R., Schwarze, M.
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 27.10.2022; The Royal Society of Chemistry
• Subjects: Aluminum oxide; Biopolymers; Catalysts; Cellulose; Chemistry; Hydrogenation; Nanoparticles; Nitrophenol; Oxidation; Platinum
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d2ra05507d

Photodeposition is a specific method for depositing metallic co-catalysts onto photocatalysts and was applied for immobilizing platinum nanoparticles onto cellulose, a photocatalytically inactive biopolymer. The obtained Pt@cellulose catalysts show narrow and well-dispersed nanoparticles with average sizes between 2 and 5 nm, whereby loading, size and distribution depend on the preparation conditions. The catalysts were investigated for the hydrogenation of para -nitrophenol via transfer hydrogenation using sodium borohydride as the hydrogen source, and the reaction rate constant was determined using the pseudo-first-order reaction rate law. The Pt@cellulose catalysts are catalytically active with rate constant values k from 0.09 × 10 −3 to 0.43 × 10 −3 min −1 , which were higher than the rate constant of a commercial Pt@Al 2 O 3 catalyst ( k = 0.09 × 10 −3 min −1 ). Additionally, the Pt@cellulose catalyst can be used for electrochemical hydrogenation of para -nitrophenol where the hydrogen is electrocatalytically formed. The electrochemical hydrogenation is faster compared to the transfer hydrogenation ( k = 0.11 min −1 ).