Recovery of Cerium Dioxide from Spent Glass-Polishing Slurry and Its Utilization as a Reactive Sorbent for Fast Degradation of Toxic Organophosphates

• DOI: 10.1155/2015/241421
• Publication Date: 2015-09-16T17:02:13Z
• Authors: Pavel Janoš; Pavel Kuráň; Jakub Ederer; Martin Šťastný; Luboš Vrtoch; Martin Pšenička; Jiří Henych; Karel Mazanec; Miroslav Skoumal
• Keywords: Cerium oxide; Ammonium carbonate

The recovery of cerium (and possibly other rare earth elements) from the spent glass-polishing slurries is rather difficult because a high resistance polishing-grade oxide toward common digestion agents. It was shown that may be extracted polishing by leaching with strong mineral acids in presence reducing agents; solution used directly for preparation ceria-based reactive sorbent. A mixture concentrated nitric acid and hydrogen peroxide effective partially dewatered slurry. After removal undissolved particles, cerous carbonate precipitated gaseous NH 3 CO 2 . Cerium prepared thermal decomposition precursor an open crucible tested as sorbent degradation highly toxic organophosphate compounds. samples annealed at optimal temperature approximately 400°C exhibited good efficiency pesticide fenchlorphos nerve agents soman VX. extraction/precipitation procedure recovers 70% minor amounts lanthanum does not disturb efficiency.