Enhanced abatement of organic contaminants by zero-valent copper and sulfite
- 159 Downloads
Sulfate radicals (SO4·−) are highly efficient for the degradation organic pollutants. SO4·− can be produced by activation of sulfites, yet actual heterogeneous activators exhibit a lower reactivity for activation of sulfite to SO4·− at pH 7.0–8.0. Here we hypothesized that zero-valent copper can activate sulfite under mild conditions. We tested the reaction with iohexol, diatrizoate, atrazine, benzoic acid, and p-chlorobenzoic acid contaminants. Reactive radicals were identified by electron paramagnetic resonance, fluorescence spectrometry, and radical scavenging experiments. Results show up to 90% abatement of contaminants by combining sulfite with zero-valent copper at pH 8.0. Moreover, zero-valent copper maintains a crystalline stability and satisfactory reusability with iohexol abatement efficiency up to 80% after five runs.
KeywordsSulfite Organic contaminants Iohexol Sulfate radical Zero-valent copper Advanced oxidation processes
This work was funded by the National Natural Science Foundation of China (Grant No. 51808233).
- Hollanda LR, Graça CAL, Andrade LM, Mendes MA, Chiavone-Filho O, Teixeira ACSC (2019) Non-traditional atrazine degradation induced by zero-valent-copper: process optimization by the Doehlert experimental design, intermediates detection and toxicity assessment. J Chem Technol Biotechnol 94:1156–1164. https://doi.org/10.1002/jctb.5862 CrossRefGoogle Scholar
- Xie P, Guo Y, Chen Y, Chen Y, Wang Z, Shang R, Wang S, Ding J, Wan Y, Jiang W, Ma J (2017) Application of a novel advanced oxidation process using sulfite and zero-valent iron in treatment of organic pollutants. Chem Eng J 314:240–248. https://doi.org/10.1016/j.cej.2016.12.094 CrossRefGoogle Scholar
- Zhou P, Zhang J, Zhang Y, Zhang G, Li W, Wei C, Liang J, Liu Y, Shu S (2018b) Degradation of 2,4-dichlorophenol by activating persulfate and peroxomonosulfate using micron or nanoscale zero-valent copper. J Hazard Mater 344:1209–1219. https://doi.org/10.1016/j.jhazmat.2017.11.023 CrossRefGoogle Scholar