Frontiers of Environmental Science & Engineering
>> 2018,
Volume 12,
Issue 1
doi:
10.1007/s11783-018-1022-2
RESEARCH ARTICLE
Significant enhancement in catalytic ozonationefficacy: From granular to super-fine powdered activated carbon
. State Key Joint Laboratory of EnvironmentSimulation and Pollution Control, School of Environment, TsinghuaUniversity, Beijing 100084, China.. Department of Urban Construction,Wuhan University of Science and Technology, Wuhan 400065, China
Available online: 2018-01-05
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Abstract
In this study, super-fine powdered activated carbon (SPAC) hasbeen proposed and investigated as a novel catalyst for the catalyticozonation of oxalate for the first time. SPAC was prepared from commercialgranular activated carbon (GAC) by ball milling. SPAC exhibited highexternal surface area with a far greater member of meso- and macropores(563% increase in volume). The catalytic performances of activatedcarbons (ACs) of 8 sizes were compared and the rate constant for pseudofirst-order total organic carbon removal increased from 0.012 min to 0.568 min (47-fold increase) withthe decrease in size of AC from 20 to 40 mesh (863 mm) to SPAC (~1.0 mm). Furthermore, the diffusion resistance of SPAC decreased17-fold compared with GAC. The ratio of oxalate degradation by surfacereaction increased by 57%. The rate of transformationof ozone to radicals by SPAC was 330 times that of GAC. The resultssuggest that a series of changes stimulated by ball milling, includinga larger ratio of external surface area, less diffusion resistance,significant surface reaction and potential oxidized surface all contributedto enhancing catalytic ozonation performance. This study demonstratedthat SPAC is a simple and effective catalyst for enhancing catalyticozonation efficacy.
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