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Adsorption of Pb(II) on variable charge soils amended with rice-straw derived biochar
Authors:Jiang Tian-Yu  Jiang Jun  Xu Ren-Kou  Li Zhuo
Institution:a State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, PR China
b College of Resource and Environment, Nanjing Agriculture University, Nanjing 210095, PR China
c College of Resource and Environment, Nanjing Forestry University, Nanjing 210037, PR China
Abstract:Two Ultisols and one Oxisol from tropical regions of southern China were incubated with rice straw biochar to investigate the effect of biochar on their surface charge and Pb(II) adsorption using batch methods. The incorporation of biochar induced a remarkable increase in soil cation exchange capacity after 30 d of incubation. The incorporation of biochar significantly increased the adsorption of Pb(II) by these variable charge soils; the enhancement of adsorption of Pb(II) by these soils increased with the addition level of biochar. Adsorption of Pb(II) involved both electrostatic and non-electrostatic mechanisms; however, biochar mainly increased Pb(II) adsorption through the non-electrostatic mechanism via the formation of surface complexes between Pb2+ and functional groups on biochar. There was greater enhancement of biochar on the non-electrostatic adsorption of Pb(II) by the variable charge soils at relatively low pH. Therefore, the incorporation of biochar decreased the activity and availability of Pb(II) to plants through increased non-electrostatic adsorption of Pb(II) by acidic variable charge soils.
Keywords:Adsorption of Pb(II)  Biochar  Oxisol  Ultisol  Surface charge  Zeta potential
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