Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 642, Issue -, Pages 1050-1059Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.06.115
Keywords
Black carbon; Modification; Phenanthrene; Nanoporosity; Nanopore-filling
Categories
Funding
- Natural Science Foundation of Guangdong Province [U1701244]
- National Natural Science Foundation of China [U1701244, 41473103]
- Earmarked Foundation of the State Key Laboratory [SKLOG2015A01]
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Black carbon was produced by slow pyrolysis under an oxygen-limited condition at 500 degrees C, and was modified by some chemical methods (oxidation, hydrolysis, activation, and surface recombination). The modified samples were characterized by using elemental analysis, Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) surface analysis, Boehm titration, cation exchange capacity(CEC)analysis, CO2 adsorption analysis, and then used to investigate the sorption behavior of phenanthrene. The results showed that the activation of ZnCl2 gave a maximum nanopore volume of 96.5 mu L/g and a specific surface area of 241 m(2)/g, while the oxidation of NaClO gave a minimum nanopore volume of 63.3 mu L/g and a specific surface area of 158 m(2)/g. The FTIR, XPS, and Boehm titration analysis showed that the new oxygen-containing functional groups were introduced during the oxidation treatments of H2O2 and NaClO. The sorption of phenanthrene on all samples was typically nonlinear, and the nonlinear factor (n) was negatively correlated with V-o, especially with V-o at 0-1.1 nm. The sorption parameter (log K-OC) was positively correlated with nanopore volume (V-o) and specific surface area (SSA). Moreover, the model analysis showed that the nanopore filling was the main sorption mechanism, and molecular sieve effect was observed in the sorption of phenanthrene. (C) 2018 Elsevier B.V. All rights reserved.
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