Sodium thiosulfate is usally used to quench with this. However, it has an effect on the TOC of its sedimentation.
Most inorganic scavengers has found to be inadequate for removal of hydrogen peroxide within a reasonable time frame. In addition to that, complete H2O2 quenching is almost impossible to achieve.
One of the best agents currently available for fast H2O2 quenching is are enzymes, i.e catalase
Most researcher use tert-butanol or tert-butyl alcohol ot quench Fenton's reaction
Many options are available.
1. KI,
2. NaOH can be used.
3.We can use MnO2 but it may interfere with TOC analysis.
4. We can safely use inorganic scavengers- Catalase is the best as it will not interfere with the analysis.
5. Tert-butanol or tert-butyl alcohol can be used but may interfere in analysis.
6.Even Chelating agents like EDTA can also be used for the purpose.
7. One of my students had used Sodium Thiosulfate Na2S2O3 without pH adjustment successfully.
Answers given by Niels and Soliu are very right and recommended by me
To quench Fenton procrss you dont need eliminate H2O2 itself. Moreover, destruction of hydrogen peroxide will distort TOC measurement/
Our expirience demonstrates that best quencher is mixture of dipyridil (or phenantrolin) + EDTA 1:1.
Тоtаl concentration of quencher must be higher than suspected amount of Fe+Cu ions. I.e. from 1 to 30 micromoles/l
Some of the methods mentioned above do work (ie ethanol/ MnO2) However a thing to note is that when measuring downstream water parameters these agents might result in false readings. Ie excess ethanol contributing to COD.
Some of the methods i have tried that has a minimal impact on Wastewater parameter is sodium sulfite. if not sodium thiosulfate. Refer to the experiment results below. What you can do is adjust pH to 10 to precipitate iron species followed by additional of quenching agents.(sodium sulfite/sodium thiosulfate/catalyse)
As per Dr K N Sheth mentioned, those method have the least impact to wastewater parameters measured. However i would suggest sodium sulfite, as it is cheaper, and more effective. Refer to my experiment below.
Experiment Findings Residual Peroxide from Fenton process and a study to evaluat...
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