Journal
CHEMOSPHERE
Volume 93, Issue 9, Pages 2011-2015Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.07.023
Keywords
Spectrophotometric ROS detection; TiO2 nanoparticles suspension; Nanoparticle interference; Selective seperation
Categories
Funding
- WCU (World Class University) program through the Korea Science and Engineering Foundation
- Ministry of Education, Science and Technology [R31-10013]
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This present study reports that reactive oxygen species (ROS), which mainly consist of hydroxyl (OH) and superoxide (O-2(-)) radicals generated by the photocatalysis of TiO2 nanoparticles (TiO2 NPs) in suspension, can be quantitatively measured by the calorimetric probe-assisted spectrometric method without any interference by the TiO2 NPs. The interference effect of the TiO2 NPs with UV-vis spectroscopy was excluded by the selective separation of p-nitrosodimethylaniline (RNO) and tetrazolium salt (XTT) (probe compounds forOH and O-2(-), respectively) from the TiO2 NPs in the suspension by centrifugation at a specified ionic strength adjusted with phosphate buffer (KH2PO4/NaOH, PB) solution. This colorimetric probeassisted spectrometric method was also successfully applied to measure the steady-state production of photogenerated ROS in a TiO2 NPs suspension. (C) 2013 Elsevier Ltd. All rights reserved.
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