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| Effects of biochar on adsorption ofnofloxacin in tropical soils |
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| Abstract: |
| A series of biochar were prepared by pyrolyzing sugarcane bagasses，a typical tropical
agricultural wastes，at three different pyrolysis temperatures（350，450，550℃），which were referred as
BC350，BC450 and BC550. The effects of biochar on adsorption of nofloxacin on Latosols and the dominant
mechanism of nofloxacin environmental behavior in biochar soils were studied. Results showed that adsorption on
Latosols and biochar-amended soils（W/W，1.0%）included two steps，the fast reaction and the slow reaction.
The adsorption kinetics of nofloxacin on Latosols and biochar-amended soils（W/W，1.0%）accorded with the
pseudo-second-order kinetics equation（r ≥ 0.963，P ＜ 0.01）. When biochar amendment rates were set as
0.1%，0.2%，0.5%，0.8% and 1.0%（W/W）of soils， it could significantly increase the adsorption of nofloxacin
on Latosols，and the adsorption quantity increased with the increasing quantity of biochar. The single-point
adsorption values of nofloxacin on biochar-amended soils were 1.04-2.34 times higher than the on Latosols. The
adsorption and desorption data over the entire range of antibiotics concentrations were well described by the
Freundlich equation，Langmuir equation and Tekmin
equation with r ≥ 0.910 and P ＜ 0.05. Mechanism
of adsorption of nofloxacin on biochar-amended soils
included surface adsorption，partition and other weak
forces. Application of biochar in soil could increase
the adsorption of organic pollutant in soil to decrease
the ecology risk. |
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