• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Heavy metals removal by EDTA-functionalized chitosan graphene oxide nanocomposites
【24h】

Heavy metals removal by EDTA-functionalized chitosan graphene oxide nanocomposites

机译：EDTA功能化的壳聚糖氧化石墨烯纳米复合材料去除重金属

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Graphene-based two-dimensional materials have been explored in a variety of applications, including the treatment of heavy-metal-rich water/wastewater. Ethylenediaminetetraacetic acid (EDTA)-functionalized magnetic chitosan (CS) graphene oxide (GO) nanocomposites (EDTA-MCS/GO) were synthesized using a reduction precipitation method and applied to the removal of heavy metals, such as Pb2+, Cu2+, and As3+, from aqueous solutions. The synthesized nanocomposite was characterized by FT-IR, XRD, SEM, MPMS, zeta-potential and BET analyses. The influence of various operating parameters, such as pH, temperature, metal ion concentration, and contact time on the removal of the metal ions, was investigated. Owing to the large specific surface area, hydrophilic behavior, and functional moieties, the magnetic nanocomposite demonstrated excellent removal ability with a maximum adsorption capacity of 206.52, 207.26, and 42.75 mg g?1 for Pb2+, Cu2+, and As3+, respectively. The equilibrium data was evaluated by Langmuir and Freundlich isotherms, while the heavy metal adsorption reaction kinetics was analyzed by Lagergren pseudo-first-order and pseudo-second-order kinetic models. The nanocomposite was reused in four successive adsorption–desorption cycles, revealing a good regeneration capacity of the adsorbent.
机译：已经研究了基于石墨烯的二维材料在各种应用中的应用，包括处理富含重金属的水/废水。使用还原沉淀法合成乙二胺四乙酸（EDTA）功能化的磁性壳聚糖（CS）氧化石墨烯（GO）纳米复合材料（EDTA-MCS / GO），并将其用于去除重金属，例如Pb 来自水溶液中的2 + ，Cu 2 + 和As 3 + 解决方案。通过FT-IR，XRD，SEM，MPMS，ζ电势和BET分析对合成的纳米复合材料进行了表征。研究了各种操作参数（例如pH，温度，金属离子浓度和接触时间）对金属离子去除的影响。由于具有较大的比表面积，亲水性和功能部分，磁性纳米复合材料具有优异的去除能力，最大吸附量为206.52、207.26和42.75 mg g ？1 用于Pb 2 + ，Cu 2 + 和As 3+ < / sup> 。平衡数据通过Langmuir和Freundlich等温线评估，而重金属吸附反应动力学通过Lagergren拟一级和拟二级动力学模型进行分析。纳米复合材料可在四个连续的吸附-解吸循环中重复使用，显示出良好的吸附剂再生能力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号