Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 148, Issue -, Pages 285-292Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2017.10.039
Keywords
Adsorption; Heavy metals; Bacterium; Biochar; Carrier; Competitive adsorption
Categories
Funding
- Natural Science Foundation of Tianjin [15JCQNJC15200]
- Key Technologies R & D Program of Tianjin [16YFZCSF00410]
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Two kinds of biochars, one derived from corn straw (CBC) and one from pig manure (PBC), were used as the carriers of a bacterium (B38) to adsorb heavy metals in solution. CBC exhibited high affinity to Hg(II), while PBC showed large adsorption capacity of Pb(II). After loading with B38, the sorption capacity of the co-sorbents were enhanced for Pb(II), but weakened for Hg(II). In a binary system, the overall adsorption capacity to Hg-Pb (CBC + B38, 136.7 mg/g; PBC + B38, 181.3 mg/g) on co-sorbents was equal to the sum of the single-component values for Hg(II) and Pb(II). Electrostatic interactions and precipitation are the major mechanisms in the adsorption of Hg(II). In contrast, cation-a interactions and precipitation were involved in the sorption process of Pb (II). Moreover, the sorption sites of Hg(II) and Pb(II) partially overlapped on the biochar surface, but were different on co-sorbents. Hence, the co-sorbents have an advantage over the biochar alone in the removal of heavy metal mixtures.
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