Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 101, Issue 1-2, Pages 74-80Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2010.09.009
Keywords
Carbon nanotube; Heat treatment; Catalytic ozonation; Oxalic acid
Funding
- 863 Hi-tech Research and Development Program of China [2009AA06Z310]
- Natural Science Foundation of China under the scheme of National Creative Research Groups [50821002]
- Natural Science Foundation of China [51008139]
- Ministry of Science and Technology of China [2006BAJ08B02]
- National Key Special Founding for Water Pollution Control and Management [2009ZX07424-005]
- China Postdoctoral Science Foundation [200902399]
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The influences of treatment conditions, gas atmosphere (N-2 and H-2) and temperature (450 degrees C and 950 degrees C), on the surface properties and catalytic performance of carbon nanotube (CNT) were investigated for the degradation of oxalic acid in aqueous solution by the process of catalytic ozonation. No obvious change on the textural properties of CNT is found after heat treatment, while the results of Boehm titration clearly indicate the reduction of acidic groups and the increase of basic groups on CNT surface after heat treatment under different conditions, and then a significant improvement on oxalic acid removal by CNT catalytic ozonation is obtained. The heat treatment of CNT under H-2 atmosphere is more effective in eliminating acidic groups and increasing basic groups than the case of N-2 atmosphere at the same temperature, which results in higher catalytic activity and lower total organic carbon (TOC) release in ozonation correspondingly. A linear relationship is observed between the pH at the point of zero charge (pH(PZC)) of CNT and the rate constant for ozonation of oxalic acid in the presence of CNT with different treatments. It is suggested that heat treatment can increase the basic property of CNT, which can enhance the contribution of surface reactions to the whole reactions for ozonation of oxalic acid. (C) 2010 Elsevier B.V. All rights reserved.
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