Departamento de Química, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.
Chemosphere. 2019 Mar;218:391-401. doi: 10.1016/j.chemosphere.2018.11.080. Epub 2018 Nov 13.
An adsorbent in the form of a CLCh/MWCNT/Fe film was prepared using multiple walled carbon nanotubes (MWCNT) doped with magnetic iron oxide and deposited in crosslinked chitosan (CLCh). The CLCh/MWCNT/Fe was characterized by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), nitrogen (N) adsorption/desorption, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS), Infrared Spectroscopy (IR) and Raman Spectroscopy. The CLCh/MWCNT/Fe film presented a maximum adsorption capacity for Cr(III) of 66.25 mg/g (150 min) and for Cr(VI) of 449.30 mg/g (60 min) at 25 °C. The CLCh/MWCNT/Fe can be easily removed from the aqueous solution by a mechanical separation or by magnetization due to its magnetic properties. In ten consecutive reutilization adsorption cycles the CLCh/MWCNT/Fe film presented efficiency losses of only 12% and 6% for the removal of Cr(III) and Cr(VI), respectively.
采用多壁碳纳米管（MWCNT）掺杂磁性氧化铁，并沉积在交联壳聚糖（CLCh）中，制备了一种 CLCh/MWCNT/Fe 形式的吸附剂。CLCh/MWCNT/Fe 采用电感耦合等离子体质谱法（ICP-MS）、氮气（N）吸附/解吸、X 射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDS）、红外光谱（IR）和拉曼光谱进行了表征。CLCh/MWCNT/Fe 薄膜在 25°C 下对 Cr(III)的最大吸附容量为 66.25 mg/g（150 min），对 Cr(VI)的最大吸附容量为 449.30 mg/g（60 min）。CLCh/MWCNT/Fe 由于其磁性，可通过机械分离或磁化从水溶液中轻松去除。在十个连续的再利用吸附循环中，CLCh/MWCNT/Fe 薄膜对 Cr(III)和 Cr(VI)的去除效率损失分别仅为 12%和 6%。
