This study presents the fabrication of novel lignin/chitin films from a solvent system composed of the ionic liquid 1-butyl-3-methylimidazolium acetate and γ-valerolactone as a biosourced cosolvent. Scanning electron microscopy and attentuated total reflectance Fourier transform infrared spectroscopy confirmed the successful preparation of the lignin/chitin films. The application of lignin/chitin film as an adsorbent for Fe(III) and Cu(II) cation uptake from aqueous solutions is discussed. It was observed that the maximum adsorption capacity for Fe(III) was 84 wt % and for Cu(II) was 22 wt % within 48 h. The lignin/chitin films could be regenerated by desorption of the Fe(III) and Cu(II) ions. Up to 12 and 46 wt %, respectively, could be released within 48 h by directly soaking the metal ion loaded film within water at room temperature. The lignin/chitin film can be considered as a stable and recyclable bioadsorbent material with a high adsorption metal ion capacity for water purification.

中文翻译：

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木质素/几丁质薄膜及其对重金属离子的吸附特性

这项研究提出了一种新型的木质素/几丁质薄膜的制备方法，该溶剂体系由离子液体乙酸1-丁基-3-甲基咪唑鎓和γ-戊内酯作为生物源助溶剂组成。扫描电子显微镜和衰减全反射傅里叶变换红外光谱证实了木质素/几丁质薄膜的成功制备。讨论了木质素/几丁质薄膜作为从水溶液中吸收Fe（III）和Cu（II）阳离子的吸附剂的应用。观察到，在48小时内，Fe（III）的最大吸附容量为84wt％，Cu（II）的最大吸附容量为22wt％。木质素/几丁质薄膜可以通过解吸Fe（III）和Cu（II）离子来再生​​。通过在室温下直接将负载金属离子的薄膜浸泡在水中，最多可在48 h内释放多达12 wt％和46 wt％的碳。