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The fabrication of small anatase titanium dioxide (TiO2) nanoparticles (NPs) attached to larger anisotropic gold (Au) morphologies by a very fast and simple two-step microwave-assisted synthesis is presented. The TiO2/Au NPs are synthesized using polyvinylpyrrolidone (PVP) as reducing, capping and stabilizing agent through a polyol approach. To optimize the contact between the titania and the gold and facilitate electron transfer, the PVP is removed by calcination at mild temperatures. The nanocatalysts activity is then evaluated in the photocatalytic production of hydrogen from water/ethanol mixtures in gas-phase at ambient temperature. A maximum value of 5.3 mmol·gcat-1·h−1 (7.4 mmol·gTiO2-1·h−1) of hydrogen is recorded for the system with larger gold particles at an optimum calcination temperature of 450°C. Herein we demonstrate that TiO2-based photocatalysts with high Au loading and large Au particle size (≈50 nm) NPs have photocatalytic activity.

本研究报道了一种快速简便的两步微波辅助合成策略，用于制备负载于大尺寸各向异性金（Au）形貌结构上的锐钛矿型二氧化钛（TiO₂）纳米颗粒（NPs）。该TiO₂/Au纳米复合材料采用多元醇法合成，以聚乙烯吡咯烷酮（PVP）作为还原剂、封端剂与稳定剂。为优化二氧化钛与金之间的界面接触并促进电子转移，通过温和温度下的煅烧工艺去除聚乙烯吡咯烷酮（PVP）。随后在常温气相条件下，以水/乙醇混合体系为原料，通过光催化产氢反应对该纳米催化剂的催化活性进行评估。当煅烧温度为最优的450℃时，采用大尺寸金颗粒的体系的产氢量可达最高值5.3 mmol·gcat⁻¹·h⁻¹（7.4 mmol·gTiO₂⁻¹·h⁻¹）。本研究证实，具备高金负载量与大尺寸金纳米颗粒（≈50 nm）的TiO₂基光催化剂具备优异的光催化活性。