Issue 9, 2018

Temperature dependence of the absorbance of 185 nm photons by water and commonly occurring solutes and its influence on the VUV advanced oxidation process

Abstract

The 185 nm photon absorption properties of water and solutes, typically found in surface water, such as chloride, nitrate, sulphate and dissolved organic carbon (DOC) were studied at temperatures between 3.5 °C and 25.0 °C. Moreover, their impact on the degradation efficiency of a model micropollutant through vacuum UV (VUV) advanced oxidation process (AOP) was assessed at temperatures of 3.6 °C and 17.5 °C. For water, an absorption coefficient of 0.79 ± 0.11 cm−1 was obtained at 3.6 °C and it was observed to increase to 1.23 ± 0.09 cm−1 and 1.53 ± 0.08 cm−1 at 17.5 °C and 25.0 °C, respectively. Degradation experiments of atrazine (i.e., model micropollutant) in distilled water showed that there was a slight decrease in the degradation efficiency of the AOP as temperature increased from 3.6 °C to 17.5 °C. Of the solutes tested, nitrate showed the largest molar absorption coefficient, followed by chloride, DOC and sulphate. In addition, the molar absorption coefficient of chloride and sulphate showed substantial sensitivity to temperature while little to no temperature dependency was observed for that of DOC and nitrate, respectively. When surface water was used, a slightly larger removal of atrazine was observed at 17.5 °C in comparison that at 3.6 °C. This was attributed to the increase in 185 nm photons absorbed by water in relation to the other major species in the solution, thus improving the generation of OH radicals.

Graphical abstract: Temperature dependence of the absorbance of 185 nm photons by water and commonly occurring solutes and its influence on the VUV advanced oxidation process

Supplementary files

Article information

Article type
Paper
Submitted
12 5 2018
Accepted
05 6 2018
First published
15 6 2018

Environ. Sci.: Water Res. Technol., 2018,4, 1303-1309

Temperature dependence of the absorbance of 185 nm photons by water and commonly occurring solutes and its influence on the VUV advanced oxidation process

A. Serrano Mora and M. Mohseni, Environ. Sci.: Water Res. Technol., 2018, 4, 1303 DOI: 10.1039/C8EW00302E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements