Open AccessCharacterization and Pb(II) removal potential of corn straw- and municipal sludge-derived biochars
Author(s) -
Shujuan Wang,
Wei Guo,
Fan Gao,
Rui Yang
Publication year - 2017
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.170402
Subject(s) - straw , biochar , environmental science , characterization (materials science) , agronomy , sewage sludge , pulp and paper industry , waste management , chemistry , pyrolysis , environmental chemistry , environmental engineering , sewage treatment , biology , materials science , engineering , nanotechnology
Corn straw- and municipal sludge-derived biochars (CS-BC and MS-BC, respectively) were used to remove Pb(II) from aqueous solutions. Despite being pyrolysed at the same temperature (723 K), MS-BC showed higher porosity and hydrophobicity than CS-BC. The optimum biochar loading and pH values allowing efficient Pb(II) removal (greater than 80%) were 0.2 g l −1 and 7.0, respectively. The presence of PO 4 3− (greater than 0.01 mol l −1 ) significantly affected the adsorptive performance of Pb(II) on the biochar samples. The adsorption data fitted well to a pseudo-second-order kinetic model and a Langmuir model, and the maximum Pb(II) adsorption capacities were 352 and 387 mg g −1 for CS-BC and MS-BC, respectively. The main mechanisms involved in the adsorption of Pb(II) on biochar were electrostatic attraction and surface complexation. When comparing both biochars, CS-BC showed better cost-effectiveness for the removal of Pb(II) from aqueous solutions.
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