•OH are nonselective and oxidize many organic compounds. Advanced oxidation processes (AOPs) for water treatment normally combine either ozone or UV irradiation with H2O2 to produce •OH. Both processes are energy-intensive, require on-site chemical storage or production, and produce •OH within reactors having only 10 s to 20 min residence times. While •OH concentrations are on the order of 0.01 nM in drinking or wastewaters during ozonation, there are no reports of •OH measurements during nanobubbles applications. Thus, a method to quantify •OH produced during NB treatments is needed to compare NBs to current AOPs used in water treatment, and this is one of my research objects recently. However, after reading lots of publications still have no idea about what approach is most proper to achieve this target.
Please look at the following below links which may help you in your analysis:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6173480/pdf/ao8b00784.pdf
http://aura-tec.com/pdf/langmuir_Identification_of_ros_2016.pdf
https://pubs.acs.org/doi/full/10.1021/acs.accounts.8b00606?ref=vi_water-for-two-worlds
https://www.researchgate.net/publication/23445029_Concentration_determination_of_oxygen_nanobubbles_in_electrolyzed_water
Thanks
Hello Zhixiang Chen , I have used pCBA, which is a reference compound, to determine produced OH•. You can have a look at my paper. Article Imidacloprid elimination by O3 and O3/UV: kinetics study, ma...
Here is a related part of my paper:
pCBA which is a well-known reference compound is widely applied to measure OH• indirectly. Also, the measurement of the probe compound, pCBA, is rather easy since it can be easily detected by HPLC.
As the OH• concentration increases, more pCBA would react with OH•. So, I think you can compare nanobubble method with conventional AOPs. Also, you can find the details of pCBA detection method via HPLC in my paper.
Best,
Busra S. Baghirzade
You can use para-chlorobenzoic acid (pCBA) as probe compound for determining hydroxyl radical concentration. The second order rate constant for pCBA with hydroxyl radical is 5.8 × 109 M−1 s−1. Refer eqn 8 of the following paper.
Mondal, B., Adak, A., & Datta, P. (2017). Effect of Operating Conditions and Interfering Substances on Photochemical Degradation of a Cationic Surfactant. Environmental Technology, (August), 1–10. https://doi.org/10.1080/09593330.2017.1365943
Asok Adak and Busra Sonmez Baghirzade thank you for your feedback on the use of pCBA as a probe compound. Would like to know if this is applicable to probe the generation of hydroxyl radical in real wastewater. Not sure if the probe compound has any interference with potential compounds within the water matrix. Do you guys have any experience with this? Please let me know thank you.
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