Citation: Buck Caitlin, Skillen Nathan, Robertson Jeanette, Robertson Peter K. J.. Photocatalytic OH radical formation and quantification over TiO₂ P25: Producing a robust and optimised screening method[J]. Chinese Chemical Letters, ;2018, 29(6): 773-777. doi: 10.1016/j.cclet.2018.04.022 shu

Photocatalytic OH radical formation and quantification over TiO₂ P25: Producing a robust and optimised screening method

a.
School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast BT9 5AG, United Kingdom
b.
School of Biological Sciences, Queen's University Belfast, Medical Biology Centre, Belfast BT9 7BL, United Kingdom

Corresponding author: Skillen Nathan, N.Skillen@qub.ac.uk
Received Date: 30 November 2017
Revised Date: 17 March 2018
Accepted Date: 17 March 2018
Available Online: 18 June 2018

Figures(5)

The development of photocatalytic technology has grown significantly since its initial report and as such, a number of screening methods have been developed to assess activity. In the field of environmental remediation, a crucial factor is the formation of highly oxidising species such as OH radicals. These radicals are often the primary driving force for the removal and breakdown of organic and inorganic contaminants. The quantification of such compounds is challenging due to the nature of the radical, however indirect methods which deploy a chemical probe to essentially capture the radical have been shown to be effective. As discussed in the work presented here, optimisation of such a method is fundamental to the efficiency of the method. A starting concentration range of coumarin from 50 μmol/L to 1000 μmol/L was used along with a catalyst loading of 0.01 g/L to 1 g/L TiO₂ to identify that 250 μmol/L and 0.5 g/L TiO₂ were the optimum conditions for production. Under these parameters a maximum production rate of 35.91 μmol/L (R_max=0.4 μmol/L OH^· min^-1) was achieved which yielded at photonic efficiency of 4.88 OH^· moles photon^-1 under UV irradiation. The data set presented also highlighted the limitations which are associated with the method which included; rapid exhaustion of the probe molecule and process inhibition through UV light saturation. Identifying both the optimum conditions and the potential limitations of the process were concluded to be key for the efficient deployment of the photocatalytic screening method.
- Photocatalytic screening,
- OH radical quantification,
- Coumarin,
- Environmental remediation,
- Method optimisation
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沈阳化工大学材料科学与工程学院沈阳 110142

Photocatalytic OH radical formation and quantification over TiO2 P25: Producing a robust and optimised screening method

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通讯作者: 陈斌, bchen63@163.com

Photocatalytic OH radical formation and quantification over TiO₂ P25: Producing a robust and optimised screening method