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Carbon aerogels: Preparation and adsorption properties to polar pesticides |
SONG Dong-bao, XUE Bing, HUANG Peng, ZHANG Peng, SUN Hong-wen |
Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China |
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Abstract The wood pulp fibers were pretreated with the mechanical ball-milling combined with TEMPO oxidation technology, and then were applied to prepare the carbon aerogels under the high-temperature pyrolysis. The morphology, element composition, special surface area, pore structure and surface functional groups of carbon aerogels were all analyzed, and their adsorption properties were evaluated by cationic imidacloprid (IMI) and anionic 2,4-D. The results showed that modification with mechanical ball-milling combined with TEMPO oxidation could significantly increase the contents of pores, surface C=O functional groups, and polarity of carbon aerogels, and reduce their layer thickness and aromaticity. Their highest specific surface area was over 2631m2/g. The adsorption isotherms of IMI and 2,4-D on carbon aerogels could be well described by the Freundlich model. The main adsorption mechanism of IMI on carbon aerogels was cation/p/π-π electron donor-acceptor interactions, hydrogen bonding, pore filling, electrostatic attraction, while the adsorption of anionic 2,4-D on prepared carbon aerogels was mainly restrained by the electrostatic repulsion. The maximal adsorption capacity of IMI and 2,4-D of the prepared carbon aerogels were 437mg/g and 286mg/g, respectively. Therefore, carbon aerogels modified with the mechanical ball-milling combined with TEMPO oxidation technology had the great potential in the field of adsorption removal of organic pollutants in water.
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Received: 22 September 2020
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