While activated carbon (AC) is widely employed for treating water resources contaminated with
hazardous organic compounds, regeneration of AC after saturation has been a concerning issue.
Supercritical water oxidation (SCWO) in a batch reactor was used to regenerate two commercial
activated carbons (CAL and COCO) saturated with pyridine or phenol. BET surface area, pore volume and
pore size distribution of CAL and COCO were characterized before and after their regeneration.
Decomposition of pyridine and phenol was examined at 400, 450, 525 8C with the presence or absence of
hydrogen peroxide. The SCWO regeneration efficiency was determined from the amount of pyridine or
phenol adsorbed and desorbed in successive adsorption-regeneration cycles. Effects of SCWO on
adsorption capacity of CAL and COCO were experimentally investigated. With SCWO enhanced by H2O2,
adsorbed organic compounds could be converted to carbon dioxide, hydrogen and nitrogen.
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