合成施威特曼石吸附Cu^2＋和Pb^2＋的实验研究

An Experimental Study on Adsorption of Cu^(2+) and Pb^(2+) by Synthesized Schwertmannite

施威特曼石普遍存在于含大量SO42-的酸矿水中,其表面吸附的SO42-使得该矿物具有强吸附重金属离子的能力,可用于处理重金属离子污染。实验通过在不同浓度Cu2+溶液中合成施威特曼石时发现,Cu2+与施威特曼石的共沉淀量较低,FTIR分析表明Cu2+与施威特曼石的羟基发生反应。开展施威特曼石吸附Pb2+的实验,结果表明施威特曼石对Pb2+的吸附符合Langmuir模型,施威特曼石吸附Cu2+和Pb2+后出现1545.4 cm-1和1435.0 cm-1(Cu2+)两个吸收峰,可能是施威特曼石孔道表面形成了三元配合物。在241×10-6的初始浓度(与尾矿孔隙水的Pb2+含量相近)下有61.4%的Pb2+去除率,显示了较好的环境修复价值。

Schwertmannite is a pervasive mineral in SO42-rich acid mine drainage（AMD）.Abundant surface-absorbed SO42-anions enhance the adsorption of heavy metal ions,thus schwertmannite can be used in remediation of heavy metals contamination.In this study,by synthesizing schwertmannite under a range of concentration of Cu2＋,it is disclosed in FTIR analysis that Cu2＋ co-precipitates with schwertmannite,and there is a interaction between Cu2＋ and-OH of schwertmannite.The process of Pb2＋ adsorption by schwertmannite is well consistent with the Langmuir model.Two FTIR peaks of 1545.4 cm-1 and 1435.0 cm-1 are assigned to the formation of ternary complex on the internal surface of schwertmannite.Under Pb2＋ concentration of 241×10-6（similar to the concentration of AMD）,61.4% of Pb2＋ can be removed by adsorption,suggesting potential applications in remediation.