Jedsukontorn Trin, Saito Nagahiro, Hunsom Mali
Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Graduate School of Engineering & Green Mobility Collaborative Research Center, Nagoya University, Nagoya 464-8603, Japan.
Nanomaterials (Basel). 2018 Apr 23;8(4):269. doi: 10.3390/nano8040269.
In this study, sol-immobilization was used to prepare gold nanoparticle (Au NP)-decorated titanium dioxide (TiO₂) photocatalysts at different Au weight % (wt. %) loading (Au/TiO₂, where is the Au wt. %) and Au⁻M NP-decorated TiO₂ photocatalysts (Au₃M₃/TiO₂), where M is bismuth (Bi), platinum (Pt) or palladium (Pd) at 3 wt. %. The Au/TiO₂ photocatalysts exhibited a stronger visible light absorption than the parent TiO₂ due to the localized surface plasmon resonance effect. Increasing the Au content from 1 wt. % to 7 wt. % led to increased visible light absorption due to the increasing presence of defective structures that were capable of enhancing the photocatalytic activity of the as-prepared catalyst. The addition of Pt and Pd coupled with the Au₃/TiO₂ to form Au₃M₃/TiO₂ improved the photocatalytic activity of the Au₃/TiO₂ photocatalyst by maximizing their light-absorption property. The Au₃/TiO₂, Au₃Pt₃/TiO₂ and Au₃Pd₃/TiO₂ photocatalysts promoted the formation of glyceraldehyde from glycerol as the principle product, while Au₃Bi₃/TiO₂ facilitated glycolaldehyde formation as the major product. Among all the prepared photocatalysts, Au₃Pd₃/TiO₂ exhibited the highest photocatalytic activity with a 98.75% glycerol conversion at 24 h of reaction time.
在本研究中，采用溶胶固定法制备了不同金重量百分比（wt.%）负载量的金纳米颗粒（Au NP）修饰的二氧化钛（TiO₂）光催化剂（Au/TiO₂，其中 为金的重量百分比）以及Au⁻M NP修饰的TiO₂光催化剂（Au₃M₃/TiO₂），其中M为铋（Bi）、铂（Pt）或钯（Pd），负载量均为3 wt.%。由于局部表面等离子体共振效应，Au/TiO₂光催化剂比母体TiO₂表现出更强的可见光吸收能力。将金含量从1 wt.%增加到7 wt.%会导致可见光吸收增加，这是由于能够增强所制备催化剂光催化活性的缺陷结构的存在增加。添加Pt和Pd并与Au₃/TiO₂形成Au₃M₃/TiO₂，通过最大化其光吸收性能提高了Au₃/TiO₂光催化剂的光催化活性。Au₃/TiO₂、Au₃Pt₃/TiO₂和Au₃Pd₃/TiO₂光催化剂促进甘油生成甘油醛作为主要产物，而Au₃Bi₃/TiO₂则促进乙醇醛生成作为主要产物。在所有制备的光催化剂中，Au₃Pd₃/TiO₂在反应24小时时表现出最高的光催化活性，甘油转化率为98.75%。
