Reuse performance of granular-activated carbon and activated carbon fiber in catalyzed peroxymonosulfate oxidation

Recently, activated carbon was investigated as an efficient heterogeneous metal-free catalyst to directly activate peroxymonosulfate (PMS) for degradation of organic compounds. In this paper, the reuse performance and the possible deactivation reasons of granular-activated carbon (GAC) and activated...

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Bibliographic Details
Published in:Environmental technology 2017-03, Vol.38 (5), p.598-605
Main Authors: Yang, Shiying, Li, Lei, Xiao, Tuo, Zhang, Jun, Shao, Xueting
Format: Article
Language:English
Subjects:
Activated carbon
activated carbon fiber
Adsorption
Azo Compounds - chemistry
Benzenesulfonates - chemistry
Carbon
Carbon - chemistry
Carbon fibers
Catalysis
Catalysts
catalyzed peroxymonosulfate oxidation
Coloring Agents - chemistry
Deactivation
Degradation
granular-activated carbon
Naphthalenesulfonates - chemistry
organic pollutant treatment
Oxidation
Oxidation-Reduction
Peroxides - chemistry
Recycling
Reuse
Reuse performance
Waste Disposal, Fluid - methods
Water Pollutants, Chemical - chemistry
Water Purification - methods
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Summary:Recently, activated carbon was investigated as an efficient heterogeneous metal-free catalyst to directly activate peroxymonosulfate (PMS) for degradation of organic compounds. In this paper, the reuse performance and the possible deactivation reasons of granular-activated carbon (GAC) and activated carbon fiber (ACF) in PMS activation were investigated. As results indicated, the reusability of GAC, especially in the presence of high PMS dosage, was relatively superior to ACF in catalyzed PMS oxidation of Acid Orange 7 (AO7), which is much more easily adsorbed by ACF than by GAC. Pre-oxidation experiments were studied and it was demonstrated that PMS oxidation on ACF would retard ACF's deactivation to a big extent. After pre-adsorption with AO7, the catalytic ability of both GAC and ACF evidently diminished. However, when methanol was employed to extract the AO7-spent ACF, the catalytic ability could recover quite a bit. GAC and ACF could also effectively catalyze PMS to degrade Reactive Black 5 (RB5), which is very difficult to be adsorbed even by ACF, but both GAC and ACF have poor reuse performance for RB5 degradation. The original organic compounds or intermediate products adsorbed by GAC or ACF would be possibly responsible for the deactivation.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2016.1205147