Thermal reactivation of ammonia-tailored granular activated carbon exhausted with perchlorate

Weifang Chen, Fred S. Cannon

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Thermal reactivation with CO2 or NH3 at temperatures higher than 700°C effectively restored the perchlorate adsorption capacity of ammonia-tailored carbon. In contrast, steam regeneration restored only a portion of the perchlorate adsorption capacity, and these distinctions were attributed to the change in surface chemistry that was induced by regeneration. After perchlorate loading, regenerating the ammonia-tailored GAC via CO 2 or NH3 preserved the nitrogen content and positive surface charge density of the initial ammonia-tailored activated carbon. In contrast, steam regeneration caused a decrease in nitrogen content and positive surface charge. Perchlorate breakthrough was monitored in rapid small-scale column test (RSSCT) operations with either CO2 or NH3 regeneration. 4000-4500 bed volumes of perchlorate adsorption life could be achieved through at least three cycles of RSSCT operation and regeneration. This compared favorably to the 4500 bed volumes that had been achieved when using the initial ammonia-tailored carbon.

Original languageEnglish (US)
Pages (from-to)2742-2749
Number of pages8
JournalCarbon
Volume43
Issue number13
DOIs
StatePublished - Nov 2005

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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