铅在锆化碳基磁性纳米复合材料上的吸附  

Adsorption of Pb^(2+) onto zirconia functionalized carbon-based magnetic nanocomposites

作　　者：龙婷婷[1] 王文娟[1] 韩玉香[1] 万玉秋[1] 郑寿荣[1] 

机构地区：[1]污染控制与资源化研究国家重点实验室,南京大学环境学院,南京210046

出　　处：《环境化学》2015年第5期949-955,共7页Environmental Chemistry

基　　金：国家重点基础研究发展计划(2014CB441103);国家自然科学基金(21407074)资助

摘　　要：采用溶剂热法和沉淀沉积法成功制备锆化碳基磁性纳米复合材料,利用TEM、XRD、VSM和XRF手段对其结构特性进行表征,并研究其对水体中重金属Pb2+的吸附行为.表征结果表明,锆修饰的碳基磁性纳米材料是核壳球形结构,具有良好的超顺磁性,在外加磁场的作用下可实现快速分离.吸附实验结果表明,材料对Pb2+的吸附量随着锆负载量的提高而增多.Pb2+在材料上的吸附等温线符合Freundlich等温吸附模式,属于优惠型吸附;降低离子强度和增加p H均可提高材料对Pb2+的吸附作用.材料脱附再生6次之后仍具有良好的吸附效果.Zirconia functionalized carbon-based magnetic nanocomposite （ denoted as Fe3 O4@C-Zr） was successfully synthesized by the hydrothermal and precipitation deposition method. The adsorbents were characterized by TEM, XRD, VSM and XRF, and their adsorption behavior for Pb^2＋ in water was investigated. Characterization results showed that Fe3 O4@ C-Zr had a core-shell spherical structure and could be rapidly separated under an external magnetic field because of its superparamagnetism. Adsorption experimental results showed that Pb^2＋ adsorption increased with ZrO2 deposition. And the adsorption isotherm could be well described by the Freundlich adsorption model, indicative of a preferential adsorption. Additionally, low ionic strength and high pH favored the adsorption of Pb^2＋. After six adsorption-desorption cycles, the adsorbent still displayed good adsorption capacity.

关 键 词：碳基磁性材料 铅 吸附 锆化 

分 类 号：X52[环境科学与工程—环境工程]