纳米纤维
壳聚糖
吸附
吸附
静电纺丝
水溶液中的金属离子
材料科学
化学工程
解吸
纳米颗粒
核化学
金属
无机化学
化学
纳米技术
复合材料
有机化学
聚合物
冶金
工程类
作者
Adib Razzaz,Shima Ghorban,Layla Hosayni,Mohammad Irani,Majid Aliabadi
标识
DOI:10.1016/j.jtice.2015.06.003
摘要
The chitosan/TiO2 composite nanofibrous adsorbents were developed by two techniques including TiO2 nanoparticles coated chitosan nanofibers (coating method) and electrospinning of chitosan/TiO2 solutions (entrapped method). The potential of prepared nanofibers was investigated for the removal of Pb (II) and Cu (II) ions in a batch system. The nanofibers were characterized by SEM, FTIR and BET analysis. Kinetic and equilibrium studies showed that the experimental data of Pb (II) and Cu (II) ions were best described by pseudo-first-order and Redlich–Peterson isotherm models using the both chitosan/TiO2 nanofibers. The maximum adsorption capacities of Cu (II) and Pb (II) ions using entrapped and coating methods were found to be 710.3, 579.1 and 526.5, 475.5 mg/g at equilibrium time of 30 min and 45 °C, respectively. The reusability studies indicated that the chitosan/TiO2 nanofibers prepared by entrapped method could be reused frequently without significant loss in adsorption performance after five adsorption/desorption cycles. Whereas, lower than 60% of total adsorption in first cycle took place for metal ions sorption using nanofibers prepared by coating method. The sorption studies of metal ions in a binary system revealed that the selectivity of metal sorption using chitosan/TiO2 nanofibrous adsorbent was in order of Cu (II) > Pb (II).
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