Photodegradation of the iodinated X-ray contract medium iopromide using combined oxidants of S2082-and H202 promoted by UV irradiation

Y. R. Wang, W. Chu, H. F. Leung

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

In the present study, the degradation of the iodinated X-ray contract medium (ICM) iopromide in aqueous solution by the combined oxidants of S2O82" and H2O2 with UV irradiation has been investigated. All experiments were carried out on a laboratory scale set-up. The effects of various parameters including different wavelengths of UV irradiation, numbers of UV lamps, and initial solution pH on the degradation efficiency have been evaluated. In addition, the presence of certain organic matters such as glucose and humic acid on the influence of the process performance was also assessed. Experimental results show that the wavelength of 254 nm exhibits best decay of ICM among the three tested wavelengths (254, 300 and 350 nm). ICM photo-decay rate linearly increases with the number of UV lamps. For the effect of solution pH, optimum performance was observed to be pH=4.34. Additionally, the sequential addition of S2O82- and H2O2 was also studied and the degradation efficiency was ranked in the following order: UV/S2O82-7H2O2>UV/H2O2+S2O82-> UV/S2O82-+H2O2. Furthermore, test results indicate that ICM photodecay rate by UV/S2O82-7H2O2 process is significantly inhibited in the presence of glucose or/and humic acid, suggesting certain pre-treatment measures should be taken to abate their negative effect upon real application.

Original languageEnglish
Title of host publicationProceedings - 3rd International Postgraduate Conference on Infrastructure and Environment, IPC 2011
EditorsSamson Zhoujun Liu, Arshad Ali Javed, Faye Danfei Ni, Allan Weilin Shen
PublisherFaculty of Construction and Land Use, The Hong Kong Polytechnic University
Pages177-184
Number of pages8
ISBN (Electronic)9789881731166
Publication statusPublished - 1 Jan 2011
Event3rd International Postgraduate Conference on Infrastructure and Environment, IPC 2011 - Hong Kong, Hong Kong
Duration: 11 Jul 201112 Jul 2011

Publication series

NameProceedings - 3rd International Postgraduate Conference on Infrastructure and Environment, IPC 2011
Volume1

Conference

Conference3rd International Postgraduate Conference on Infrastructure and Environment, IPC 2011
Country/TerritoryHong Kong
CityHong Kong
Period11/07/1112/07/11

Keywords

  • Advanced oxidation process
  • Hydroxyl radical
  • Iopromide
  • Persulfate
  • Sulfate radical

ASJC Scopus subject areas

  • Building and Construction
  • Environmental Science(all)

Cite this