Jiang Canlan, Cai Hao, Chen Lulu, Chen Liwei, Cai Tianming
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
Environ Sci Pollut Res Int. 2017 Feb;24(4):3861-3871. doi: 10.1007/s11356-016-8060-8. Epub 2016 Nov 30.
Biochars derived from Pinus massoniana and Cunninghamia lanceolata trunks (abbreviated as PB and CB, respectively) were used to investigate their potential capabilities to improve lead (Pb(II)) and antibiotic florfenicol (FLO) immobilization in soil. Results shows that, after incubation for 60 days, the maximum adsorption capacities (Q ) of biochar-treated soils (soil-PB and soil-CB) for Pb(II) was increased by 27 and 14 %, respectively, compared with pristine soil sample. In the case of FLO, however, the Q of biochar-treated soils were enhanced by 266 and 206 % for soil-PB and soil-CB, respectively. The increased Pb(II) adsorption was mainly due to the enhanced interactions between Pb(II) and oxygen-containing functional groups and aromatic structures in biochars. Whereas, the improvement of FLO adsorption was achieved through electrostatic interaction, hydrogen bonding, and van der Waals forces interactions between FLO molecule and biochars. Regardless of the similarities in chemical compositions between two biochars, significantly higher surface area and total pore volume of PB than CB biochar may be the key factors accounting for the differences in adsorption efficiencies for Pb(II) and FLO between Soil-PB and Soil-CB.
以马尾松和杉木树干为原料制备的生物炭（分别简称为PB和CB）用于研究其提高土壤中铅（Pb(II)）和抗生素氟苯尼考（FLO）固定化的潜在能力。结果表明，培养60天后，与原始土壤样品相比，生物炭处理土壤（土壤-PB和土壤-CB）对Pb(II)的最大吸附容量（Q ）分别提高了27%和14%。然而，对于FLO，土壤-PB和土壤-CB中生物炭处理土壤的Q 分别提高了266%和206%。Pb(II)吸附量增加主要是由于Pb(II)与生物炭中含氧官能团和芳香结构之间的相互作用增强。而FLO吸附的改善是通过FLO分子与生物炭之间的静电相互作用、氢键和范德华力相互作用实现的。尽管两种生物炭的化学成分相似，但PB生物炭的表面积和总孔体积显著高于CB生物炭，这可能是导致土壤-PB和土壤-CB对Pb(II)和FLO吸附效率存在差异的关键因素。
