研究报告

  • 金晓英,杨露,林强,李恒,陈祖亮.绿色合成纳米铁镍去除水中Cr(VI)的动力学及机理[J].环境科学学报,2022,42(10):284-292

  • 绿色合成纳米铁镍去除水中Cr(VI)的动力学及机理
  • Investigation of kinetic process and removal mechanism of Cr(VI) in water by green synthesized Fe/Ni nanoparticles
  • 基金项目:国家自然科学基金(No.52174158);福建省水利科技项目(No.MSK202208)
  • 作者
  • 单位
  • 金晓英
  • 福建师范大学环境科学与工程学院,福州 350007;福建省污染控制与资源循环利用重点实验室,福州 350007
  • 杨露
  • 福建师范大学环境科学与工程学院,福州 350007;福建省污染控制与资源循环利用重点实验室,福州 350007
  • 林强
  • 福建省水土保持试验站,福州 350001
  • 李恒
  • 福建师范大学环境科学与工程学院,福州 350007;福建省污染控制与资源循环利用重点实验室,福州 350007
  • 陈祖亮
  • 福建师范大学环境科学与工程学院,福州 350007;福建省污染控制与资源循环利用重点实验室,福州 350007
  • 摘要:利用桉树叶提取液制备铁镍纳米颗粒(Fe/Ni NPs),并将其用于去除水中六价铬(Cr(VI)).扫描电子显微镜-能量色散X射线光谱(SEM-EDS)分析表明Fe/Ni NPs与Cr(VI)之间发生了相互作用,但反应前后Ni的含量几乎没有变化. X射线光电子能谱(XPS)则表明反应后材料表面存在三价铬(Cr(Ⅲ)).循环伏安曲线证明Fe NPs与Cr(VI)反应有还原峰出现,Ni的掺杂加速了吸附剂与吸附质间的电子转移.吸附动力学模型拟合结果表明,Fe/Ni NPs吸附Cr(VI)的过程符合准二级动力学模型,说明吸附过程主要是化学控制的.Weber-Morris粒子内扩散模型 拟合结果表明,反应速度由液膜扩散和内扩散共同控制.还原动力学很好地符合准一级动力学过程.反应活化能Ea为41.137 kJ·mol-1,表明 Fe/Ni NPs对Cr(VI)的吸附和催化还原过程主要由化学反应控制.
  • Abstract:Fe/Ni nanoparticles (Fe/Ni NPs) were prepared by eucalyptus leaf extract and used to remove Cr(VI) from aqueous solution. Scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) showed that Fe/Ni NPs interacted with Cr(VI) and the content of Ni was basically unchanged. X-ray photoelectron spectroscopy (XPS) indicated that Cr(VI) was adsorbed onto Fe/Ni NPs and reduced to Cr(III). Cyclic voltammetry curve (C-V curve) proved that both Fe NPs and Cr(VI) had reduction peaks, and Ni doping accelerated electron transfer. The kinetic data was well fitted by the pseudo-second-order model, suggesting that chemisorption dominated the Cr(VI) removal process. Moreover, Weber-Morris model revealed that adsorption process was controlled by both the liquid film diffusion and intraparticle diffusion. The reduction kinetics data fitted well to a pseudo-first-order model. The activation energy (Ea) of 41.137 kJ·mol-1 confirmed that the adsorption and catalytic reduction of Cr(VI) by Fe/Ni NPs were mainly controlled by chemical reactions.

  • 摘要点击次数: 138 全文下载次数: 198