A UVC based advanced photooxidation reactor design for remote households and communities not connected to a municipal drinking water system

Jiao, Yongmei; Shang, Helen; Scott, John A.

doi:10.1016/j.jece.2021.105162

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…Furthermore, it is necessary to consider that these reactions are influenced by the operation conditions and are not the only ones occurring. For example, the dissociation action exerted by UV-C radiation on water molecules and PMS, which will provide radicals to the media and reaction intermediates, enhancing or reducing the activity of Fe 2+ to destroy pollutant molecules [13,51]. Other examples of reactions that occur in the media are those related to the oxidation of ferric compounds by the action of water that will provide hydroxyl radicals to the media [49].…”

Section: Methylene Blue Discoloration By the Pms/fe 2+ /Uv Systemmentioning

confidence: 99%

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

González-Quiles

Andrés

Rodríguez-Chueca

2021

Water

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The increase in world population and human activities are leading to an increase in water stress in many regions of the planet, coupled with a decrease in the quality of water bodies. Advanced oxidation processes have demonstrated great potential for the reduction of almost any organic pollutant; however, it is necessary to intensify this type of treatment in order to reduce contact times and to reach a greater number of pollutants. The generation of sulfate radicals by activation of peroxymonosulfate (PMS) by divalent iron (Fe2+) and/or titanium dioxide (TiO2) were statistically studied to understand the role of these compounds as activators, using methylene blue as target pollutant because of its ease of handling and analysis. A factorial experimental design was used to study the influence of different variables (PMS, Fe2+, and TiO2) in the presence of UV-A or UV-C. There were relevant differences in the discoloration of methylene blue when analyzing the size of the effects and significance of the experiments, when UV-A or UV-C was used, being faster with UV-C. For instance, total discoloration of methylene blue was reached after 60 min with the system PMS/UV-C, while after 90 min only the 59% of methylene blue disappeared in presence of PMS/UV-A. Both Fe2+ and TiO2 in combination with PMS and UV increased the discoloration effect. So, in the presence of Fe2+, total discoloration of methylene blue was observed after 30 min in presence of UV-A, while this yield was reached in 7.5 min under UV-C. In the case of PMS/TiO2, it required 60 min under UV-A radiation to totally remove methylene blue, and around 15 min with UV-C. Statistically, the three variables were observed to have the main effect in combination with UV. Furthermore, the PMS/Fe2+ system has a significant interaction with UV-A and UV-C radiation, while the interaction of PMS/TiO2 was significant under UV-A, but with a negative effect under UV-C, or in other words the high elimination rates observed are achieved by the oxidation potential of UV-C, and the effect of PMS and TiO2 by itself.

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Section: Methylene Blue Discoloration By the Pms/fe 2+ /Uv Systemmentioning

confidence: 99%