College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, PR China.
Int J Biol Macromol. 2023 Mar 15;231:123337. doi: 10.1016/j.ijbiomac.2023.123337. Epub 2023 Jan 20.
Magnetic nanohybrid combining chitosan and graphene have demonstrated promising application in environmental remediation. Herein, ternary composite MCG based on FeO, chitosan (CS) and graphene oxide (GO) was facilely prepared via solvothermal method. The as prepared composite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman, Brunauer/Emmett/Teller-Barret/Joyner/Halenda (BET-BJH) and thermo gravimetric-differential thermal analysis (TG-DTA). The combination mechanism of MCG was unveiled via employing the hard-soft acid-base (HSAB) theory and spectroscopic investigations including X-ray photoelectron spectroscopy (XPS), Ultraviolet-visible (UV-Vis) and fluorescent emission spectra. Particularly, combination mechanism of MCG was elucidated by the probable site to site interaction of the couplet components in MCG, as follows. (1) CS-FeO. The primary interaction is N(NH)-Fe(III), electron donates from N to Fe, transforming one half of the amino groups of chitosan into positive N. (2) GO-CS. Amidation reaction is the primary interaction form, converting the other half of the amino groups of chitosan into -C(O)NH-. (3) GO-FeO. Dominant interactions are those of epoxy, hydroxyl and aromatic ring with Fe(III). Moreover, MCG exhibits fair adsorption performance on divalent heavy metals in six consecutive cycles. These explorations may shed light on the design of efficient adsorbent based on FeO-chitosan-graphene architecture.
磁性纳米杂化材料结合壳聚糖和石墨烯在环境修复中表现出了很有前景的应用。本文通过溶剂热法简便地制备了基于 FeO、壳聚糖（CS）和氧化石墨烯（GO）的三元复合材料 MCG。通过 X 射线衍射（XRD）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、拉曼、BET-BJH 和热重-差热分析（TG-DTA）对所制备的复合材料进行了表征。通过采用硬软酸碱（HSAB）理论和光谱研究，包括 X 射线光电子能谱（XPS）、紫外可见（UV-Vis）和荧光发射光谱，揭示了 MCG 的结合机制。特别是，通过 MCG 中偶联成分的可能位点到位点相互作用，阐明了 MCG 的结合机制，如下所示。（1）CS-FeO。主要相互作用是 N(NH)-Fe(III)，氮从 N 向 Fe 供电子，将壳聚糖氨基的一半转化为正 N。（2）GO-CS。酰胺化反应是主要的相互作用形式，将壳聚糖氨基的另一半转化为 -C(O)NH-。（3）GO-FeO。主要相互作用是环氧、羟基和芳环与 Fe(III)。此外，MCG 在六个连续循环中对二价重金属表现出良好的吸附性能。这些探索可能为基于 FeO-壳聚糖-石墨烯结构的高效吸附剂的设计提供启示。
