Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 2, Pages 1257-1269Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am507428r
Keywords
bismuth tungstate(Bi2WO6); semiconductor photocatalyst; heterogeneous catalysis; alcohol oxidation; sunlight
Funding
- King Abdulaziz City for Science and Technology (KACST) through Science and Technology Unit at King Fahd University of Petroleum and Minerals (KFUPM) [10-NAN1387-04]
- Center of Excellence in Nanotechnology
- Department of Chemistry, KFUPM
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Selective conversion of aromatic alcohols into corresponding aldehydes is important from energy and environmental stance. Here, we describe highly selective (>99%) and efficient conversion (>99%) of aromatic alcohols (e.g., 4-methoxybenzyl alcohol and 4-nitrobenzyl alcohol) into their corresponding aldehydes in the presence of Pt-modified nanoporous hierarchical Bi2WO6 spheres in water under simulated sunlight at ambient conditions. Overoxidation of p-anisaldehyde, formed during photooxidation process, was not observed until comprehensive alcohol oxidation was attained. Furthermore, the catalyst showed substantial oxidation under dark and course of conversion was different than that of under light. Dependency of alcohol oxidation on substrate concentration, photocatalyst amount, and Pt loading was studied. The effect of various radical scavengers was investigated, and the rate-determining step was elucidated. It has been envisaged that the reduction site of semiconductor photocatalysts plays more decisive role in determining the selectivity as alcohol preferably get oxidized over that of water. Furthermore, the chemical stability and recyclability of the photocatalyst were investigated.
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