A new hydrazono-imidazoline modified cellulose (HI-MC) was synthesized for selective recovery of Pt(IV), Pd(II) and Au(III) from geological samples. Cellulose was oxidized by periodate and was further functionalized with hydrazono-imidazoline moieties to afford N-donor chelating fibers. Scanning electron microscopy (SEM), Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N₂ physisorption, elemental analysis, and energy-dispersive X-ray spectroscopy (EDX) were used for characterization. Introducing the hydrazono-imidazoline groups at the surface of cellulose fibers did not alert their ordered structure and crystallinity, as indicated by XRD and SEM results. Factors affecting the adsorption were systematically investigated. Under the optimized conditions, the HI-MC sorbent exhibited high adsorption capacities of 105, 88 and 75 mg g^-1 for Pt(IV), Pd(II) and Au(III), respectively. Besides, the metal ion adsorption process fitted by pseudo-second-order kinetic model and Langmuir adsorption isotherm. These results highlight the applicability of this carbohydrate-based sorbent for the selective recovery of precious metals from various matrices.

合成了一种新型的肼基-咪唑啉改性纤维素（HI-MC），用于从地质样品中选择性回收Pt（IV），Pd（II）和Au（III）。纤维素被高碘酸盐氧化，并用-咪唑啉部分进一步官能化，得到N-供体螯合纤维。扫描电子显微镜（SEM），傅立叶变换红外光谱（FT-IR），X射线衍射（XRD），N ₂物理吸附，元素分析和能量色散X射线光谱（EDX）用于表征。如XRD和SEM结果所示，在纤维素纤维的表面引入肼基-咪唑啉基团并不能提示其有序的结构和结晶度。系统地研究了影响吸附的因素。在最佳条件下，HI-MC吸附剂对Pt（IV），Pd（II）和Au（III）的吸附容量分别为105、88和75 mg g ^-1。此外，利用拟二阶动力学模型和朗缪尔吸附等温线拟合了金属离子的吸附过程。这些结果突出了这种基于碳水化合物的吸附剂在从各种基质中选择性回收贵金属的适用性。