Tian-Yu Jiang Jun Jiang Ren-Kou Xu Zhuo Li.Adsorption of Pb(II) on variable charge soils amended with rice-straw derived biochar.Chemosphere 2012 89: 249–256. http://dx.doi.org-10.1016-j.chemosphere.2012.04.028

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.

    添加稻草生物质炭对可变电荷土壤吸附Pb(II)的影响

    蒋田雨，姜军，徐仁扣，李卓

    Chemosphere 89 (2012) 249–256

    http://dx.doi.org-10.1016-j.chemosphere.2012.04.028

   摘要：将从我国南方热带地区采集的两种红壤和一种砖红壤与稻草生物质炭混合培养30天，研究了添加生物质炭对土壤表面电荷和Pb(II)吸附的影响。结果表明，添加生物质炭明显提高了土壤阳离子交换量，土壤对Pb(II)的吸附能力显著增强，且Pb(II)的吸附量随着生物质炭加入量的增加而增加。Pb(II)在可变电荷土壤表面的吸附涉及静电吸附与非静电吸附两种机制，生物质炭主要通过其表面含氧官能团与Pb(II)形成络合物，从而提高了Pb(II)的专性吸附量。较低pH下，添加生物质炭使可变电荷土壤对Pb(II)的非静电吸附显著增强。因此，添加生物质炭可以增强可变电荷土壤对Pb(II)的专性吸附，从而明显降低Pb(II)的活性和生物有效性。