Surface-bound sulfate radical-dominated degradation of 1,4-dioxane by alumina-supported palladium (Pd/Al2O3) catalyzed peroxymonosulfate

Yong Feng, Po Heng Lee, Deli Wu, Kaimin Shih

Research output: Journal article publicationJournal articleAcademic researchpeer-review

80 Citations (Scopus)

Abstract

Unfortunately, the efficient activation of peroxymonosulfate (PMS), one of the most commonly used oxidants for the generation of sulfate radicals, still relies heavily on cobalt-bearing materials that are potential carcinogens. Although copper-iron bimetallic materials are promising activators, stoichiometric amounts of metals are required to achieve satisfactory performance. In this study, we propose a real catalytic process that is capable of degrading extremely recalcitrant 1,4-dioxane using a combination of alumina-supported metallic palladium (Pd/Al2O3) with PMS. The metal loading–normalized pseudo–first-order constant for 1,4-dioxane degradation with Pd/Al2O3was more than 16,800 times that with copper-iron bimetallic materials. Complementary to Fenton reagents, Pd/Al2O3-PMS had a wide effective pH range from 4.0 to 8.5. In the absence of a substrate, PMS underwent more rapid decomposition under all conditions investigated, which suggests that its activation did not likely proceed via the previously proposed non-radical mechanism. On the basis of the strong inhibitory effects of common scavengers, we instead propose that surface-bound sulfate radicals were probably the dominant active species. A near-100% conversion rate of PMS to radicals was achieved with the Pd/Al2O3catalyst.
Original languageEnglish
Pages (from-to)12-21
Number of pages10
JournalWater Research
Volume120
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • 1,4-dioxane
  • Advanced oxidation process
  • Pd/Al O 2 3
  • Peroxymonosulfate
  • Sulfate radical
  • Surface-bound radical

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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