期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 445, 期 -, 页码 1-8出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.12.074
关键词
Ordered mesoporous carbon; Iron oxide nanoparticles; 2,4-Dichlorophenoxyacetic acid; Adsorption
资金
- Young Top-Notch Talent Support Program of China
- National Natural Science Foundation of China [51222805]
- Program for New Century Excellent Talents in University from the Ministry of Education of China [NCET-11-0129]
- Interdisciplinary Research Project of Hunan University
- Fundamental Research Funds for the Central Universities
- Hunan University
- Foundation for the Author of Excellent Doctoral Dissertation of Hunan Province
The ordered mesoporous carbon composite functionalized with carboxylate groups and iron oxide nanoparticles (Fe/OMC) was successfully prepared and used to adsorb 2,4-dichlorophenoxyacetic acid (2,4-D) from wastewater. The resultant adsorbent possessed high degree of order, large specific surface area and pore volume, and good magnetic properties. The increase in initial pollutant concentration and contact time would make the adsorption capacity increase, but the pH and temperature are inversely proportional to 2,4-D uptake. The equilibrium of adsorption was reached within 120 min, and the equilibrated adsorption capacity increased from 99.38 to 310.78 mg/g with the increase of initial concentration of 2,4-D from 100 to 500 mg/L. Notablely, the adsorption capacity reached 97% of the maximum within the first 5 min. The kinetics and isotherm study showed that the pseudo-second-order kinetic and Langmuir isotherm models could well fit the adsorption data. These results indicate that Fe/OMC has a good potential for the rapid adsorption of 2,4-D and prevention of its further diffusion. (C) 2014 Elsevier Inc. All rights reserved.
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