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Download fileCobalt Porphyrazine Supported on SnO2 with Oxygen Vacancies for Boosting Photocatalytic Aerobic Oxidation of Glucose to Organic Acids in an Aqueous Medium
journal contribution
posted on 23.01.2021, 17:43 authored by Quanquan Zhang, Changjun Yang, Bingguang Zhang, Kejian DengThere
is increasing interest in the production of value-added chemicals
by oxidizing glucose with the aid of photocatalysis in an aqueous
medium. Herein, a new SnO2-OVs/CoPz composite was prepared
through cobalt tetra(2,3-bis(butylthio)maleonitrile)porphyrazine (CoPz)
supported on SnO2 with oxygen vacancies (SnO2-OVs), and the as-prepared SnO2-OVs/CoPz composite exhibited
strong visible-light absorption and excellent charge separation efficiency.
The SnO2-OVs/CoPz composite possessed a stronger adsorption
ability toward glucose, while the composite possessed a moderate adsorption
ability toward organic acid. Therefore, the SnO2-OVs/CoPz
composite showed excellent photocatalytic activity for oxidizing glucose
to organic acid in an aqueous medium, using atmospheric dioxygen as
an oxidant under simulated sunlight irradiation. Various kinds of
organic acids including glucaric acid, gluconic acid, and formic acid
were acquired through this composite photocatalytic system. The synergy
of SnO2-OVs and CoPz accelerated the glucose oxidation.
The total selectivity toward the above three organic acids can reach
up to 81.5% at 43.6% glucose conversion after reacting for 3 h under
optimal conditions, especially 28.5% selectivity toward glucaric acid
was acquired in an aqueous medium. The effects of various active species
on glucose oxidation were further revealed by scavenger experiments
and ESR detections. This work provides a strategy to fabricate new
photocatalysts for efficient organic transformation.