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Bromate inhibition by reduced graphene oxide in thermal/PMS process
Xin Huang1, Xujie Zhou1, Jizhi Zhou1
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Water Research
|July 7, 2017
Summary
Reduced graphene oxide (rGO) effectively inhibits bromate (BrO3-) formation in advanced oxidation processes. This study shows rGO masks hypobromous acid, preventing bromate generation during thermally activated peroxymonosulfate treatments.
Area of Science:
- Environmental Chemistry
- Materials Science
Background:
- Bromate (BrO3-) is a disinfection byproduct formed from bromide (Br-) oxidation.
- Sulfate radical-involved processes can generate bromate.
- Controlling bromate formation is crucial for water treatment.
Purpose of the Study:
- To investigate the efficacy of reduced graphene oxide (rGO) in inhibiting bromate formation.
- To explore the mechanism of rGO's action in thermally activated peroxymonosulfate (PMS) treatment.
Main Methods:
- Utilized thermally activated peroxymonosulfate (PMS) with varying concentrations of rGO.
- Analyzed PMS decomposition and pollutant removal rates.
- Quantified bromate and hypobromous acid (HOBr) concentrations.
- Investigated rGO's effect across a range of pH and temperatures.
Main Results:
- rGO addition slightly increased PMS decomposition and pollutant removal rates.
- rGO significantly reduced bromate formation by 67%-100% under various conditions.
- rGO effectively reduced hypobromous acid (HOBr) to bromide (Br-) at room temperature.
- Bromate inhibition by rGO is likely due to masking HOBr, an intermediate in bromate formation.
Conclusions:
- Reduced graphene oxide is a promising additive for preventing bromate formation in advanced oxidation processes.
- rGO's mechanism involves inhibiting HOBr, a key intermediate, rather than directly interfering with oxidation.
- The findings suggest rGO can be used to mitigate unwanted bromine species in water treatment.
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