Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 23, Issue 2, Pages 177-182Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60391-9
Keywords
mesoporous carbon; CMK-3; powdered activated carbon; bisphenol A; endocrine disrupting chemicals
Categories
Funding
- National Science Fund for Distinguished Young Scholars [50625823]
- Program of Research on Key Technology of Environmental Pollution Control and Quality Improvement [2007DFC90170]
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Bisphenol A (BPA) is of global concern due to its disruption of endocrine systems and ubiquity in the aquatic environment. It is important, therefore, that efforts are made to remove it from the aqueous phase. A novel adsorbent, mesoporous carbon CMK-3, prepared from hexagonal SBA-15 mesoporous silica was studied for BPA removal from aqueous phase, and compared with conventional powdered activated carbon (PAC). Characterization of CMK-3 by transmission electron microscopy (TEM), X-ray diffraction, and nitrogen adsorption indicated that prepared CMK-3 had an ordered mesoporous structure with a high specific surface area of 920 m(2)/g and a pore-size of about 4.9 nm. The adsorption of BPA on CMK-3 followed a pseudo second-order kinetic model. The kinetic constant was 0.00049 g/(mg.min), much higher than the adsorption of BPA on PAC. The adsorption isotherm fitted slightly better with the Freundlich model than the Langmuir model, and adsorption capacity decreased as temperature increased from 10 to 40 degrees C. No significant influence of pH on adsorption was observed at pH 3 to 9; however, adsorption capacity decreased dramatically from pH 9 to 13.
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