Immobilization of Cu(II), Pb(II) and Cd(II) by the addition of rice straw derived biochar to a simulated polluted Ultisol
Immobilization of Cu(II), Pb(II) and Cd(II) by the addition of rice straw derived biochar to a simulated polluted Ultisol
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DOI：
10.1016/j.jhazmat.2012.05.086
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发表时间：
2012-08-30
影响因子：
13.6
通讯作者：
Li, Zhuo
中科院分区：
文献类型：
--
作者：
Jiang, Jun;Xu, Ren-kou;Li, Zhuo
为开发酸性土壤重金属污染修复新方法，比较了添加和不添加稻草生物炭的红壤中Cu（II）、Pb（II）和Cd（II）的化学形态，并研究了添加生物炭对重金属迁移性和生物有效性的影响。生物质炭的掺入降低了土壤表面zeta电位，增加了CEC，使土壤表面负电荷更负。此外，添加生物炭后，土壤pH值显着增加。这些土壤性质的变化有利于重金属在土壤中的固定。随着生物炭添加量的增加，酸溶性Cu（II）和Pb（II）分别降低了19.7-100.0%和18.8- 77.0%。酸溶态Cd（II）的下降幅度为5.6- 14.1%，远低于Cu（II）和Pb（II）。当添加5.0 mmol/kg重金属时，添加3%和5%生物炭处理的可还原态Pb（II）分别是未添加生物炭处理的2.0和3.0倍，而可还原态Cu（II）分别增加了61.6%和132.6%。当添加3%和5%的生物炭时，Pb（II）的可氧化部分分别增加了1.18和1.94倍，而Cu（II）的可氧化部分分别增加了8.13和7.16倍，主要是由于生物炭的官能团对Cu（II）的高吸附亲和力。土壤中残留的重金属含量较低，且随生物炭的加入变化不大。(C)2012爱思唯尔有限公司版权所有。
To develop new remediation methods for acidic soils polluted by heavy metals, the chemical fractions of Cu(II), Pb(II) and Cd(II) in an Ultisol with and without rice straw biochar were compared and the effect of biochar incorporation on the mobility and bioavailability of these metals was investigated. In light of the decreasing zeta potential and increasing CEC, the incorporation of biochar made the negative soil surface charge more negative. Additionally, the soil pH increased markedly after the addition of biochar. These changes in soil properties were advantageous for heavy metal immobilization in the bulk soil. The acid soluble Cu(II) and Pb(II) decreased by 19.7-100.0% and 18.8-77.0%, respectively, as the amount of biochar added increased. The descending range of acid soluble Cd(II) was 5.6-14.1%, which was much lower than that of Cu(II) and Pb(II). When 5.0 mmol/kg of these heavy metals was added, the reducible Pb(II) for treatments containing 3% and 5% biochar was 2.0 and 3.0 times higher than that of samples without biochar, while the reducible Cu(II) increased by 61.6% and 132.6% for the corresponding treatments, respectively. When 3% and 5% biochar was added, the oxidizable portion of Pb(II) increased by 1.18 and 1.94 times, respectively, while the oxidizable portion of Cu(II) increased by 8.13 and 7.16 times, respectively, primarily due to the high adsorption affinity of functional groups of biochar to Cu(II). The residual heavy metal contents were low and changed little with the incorporation of biochar. (C) 2012 Elsevier B.V. All rights reserved.