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Modified powder activated carbon-catalyzed ozonation of humic acid: influences of chemical and textural properties
- Source :
- Water Science and Technology. 2017:58-65
- Publication Year :
- 2018
- Publisher :
- IWA Publishing, 2018.
-
Abstract
- A modification method that combines thermal and oxidation treatments was used to improve catalytic activity of activated carbon (AC) which catalyzed ozonation of the aquatic contaminant humic acid (HA). As a consequence of modifying virgin AC, modified AC (ACN2O2N2) had good catalytic performance for ozonation of HA. Apparent first-order rate constants (kapp) were ACN2O2N2 (7.88 × 10ā3 sā1) > virgin AC (3.28 × 10ā3 sā1). This change was discussed in terms of three factors: textural property, graphitization degree, and surface chemical property. From analysis results, it was deduced that the surface chemical property (the concentration of surface groups) was the main factor that influenced catalytic activity. An increase in the concentration of hydroxyl groups on AC enhanced catalytic activity of AC in ozonation of HA. Effects of phosphate (both a ligand and a strong Lewis base) further confirmed that Lewis acid sites (hydroxyl groups) were the active centers for free radical reaction in catalytic ozonation of AC.
- Subjects :
- Powdered activated carbon treatment
Environmental Engineering
Surface Properties
02 engineering and technology
010501 environmental sciences
Waste Disposal, Fluid
01 natural sciences
Catalysis
Water Purification
chemistry.chemical_compound
Ozone
Reaction rate constant
medicine
Humic acid
Lewis acids and bases
Humic Substances
0105 earth and related environmental sciences
Water Science and Technology
chemistry.chemical_classification
Free-radical reaction
021001 nanoscience & nanotechnology
Phosphate
chemistry
Charcoal
0210 nano-technology
Oxidation-Reduction
Water Pollutants, Chemical
Activated carbon
medicine.drug
Nuclear chemistry
Subjects
Details
- ISSN :
- 19969732 and 02731223
- Volume :
- 2017
- Database :
- OpenAIRE
- Journal :
- Water Science and Technology
- Accession number :
- edsair.doi.dedup.....1fed25578cabc725d95bf3b89a89eda7