Adamovich Sergey N, Nalibayeva Arailym M, Abdikalykov Yerlan N, Turmukhanova Mirgul Zh, Filatova Elena G, Chugunov Alexandr D, Ushakov Igor A, Oborina Elizaveta N, Rozentsveig Igor B, Verpoort Francis
E. Favorsky Irkutsk Institute of Chemistry, SB RAS, 1 Favorsky Str., 664033 Irkutsk, Russia.
D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry, 142 D. Kunaeva Str., Almaty 050010, Kazakhstan.
Int J Mol Sci. 2025 Aug 15;26(16):7903. doi: 10.3390/ijms26167903.
Zeolites are widely used as adsorbents due to their porous structure and ion-exchange capabilities. However, their adsorption efficiency for heavy metal ions remains limited. To enhance their performance, the natural zeolite heulandite () was functionalized with guanidine derivatives: N-[3-(triethoxysilyl)propyl]guanidine (), -aminoguanidine (), and -acetyl-guanidine (). The resulting materials (-) were evaluated for their ability to adsorb Co, Cu, and Ni from aqueous solutions. The composition and structure of silanes - were confirmed by FT-IR and H and C NMR spectroscopy methods. The modified zeolites were characterized using nitrogen adsorption/desorption (BET) and SEM-EDX to confirm their functionalization and assess the structural changes. A TGA-DSC was used to determine the thermal stability. The adsorption experiments were conducted in single and multi-ionic aqueous solutions at pH 5.0 to evaluate metal uptake. Functionalization significantly improved the adsorption efficiency, with - showing a three to six times greater adsorption capacity than the unmodified zeolite. The adsorption efficiency followed the trend Cu > Co > Ni, primarily due to chelate complex formation between the metal ions and guanidine groups. The SEM-EDX confirmed the co-localization of nitrogen atoms and metal ions. The functional materials (-) exhibited strong potential as adsorbents for noble, heavy, and toxic metal ions, and could find applications in industry, agriculture, ecology, medicine, chemistry, wastewater treatment, soil remediation, chemisorption, filtration, chromatography, etc.
由于其多孔结构和离子交换能力，沸石被广泛用作吸附剂。然而，它们对重金属离子的吸附效率仍然有限。为了提高其性能，天然丝光沸石（）用胍衍生物进行了功能化处理：N-[3-(三乙氧基甲硅烷基)丙基]胍（）、氨基胍（）和乙酰胍（）。对所得材料（-）从水溶液中吸附钴、铜和镍的能力进行了评估。通过傅里叶变换红外光谱（FT-IR）以及氢和碳核磁共振（H和C NMR）光谱方法确定了硅烷-的组成和结构。使用氮吸附/脱附（BET）和扫描电子显微镜-能谱仪（SEM-EDX）对改性沸石进行了表征，以确认其功能化并评估结构变化。使用热重-差示扫描量热仪（TGA-DSC）测定热稳定性。在pH值为5.0的单离子和多离子水溶液中进行吸附实验，以评估金属的吸收情况。功能化显著提高了吸附效率，其中-的吸附容量比未改性的沸石大3至6倍。吸附效率遵循铜>钴>镍的趋势，这主要是由于金属离子与胍基团之间形成了螯合络合物。SEM-EDX证实了氮原子和金属离子的共定位。功能材料（-）作为贵金属、重金属和有毒金属离子的吸附剂具有很强的潜力，可应用于工业、农业、生态、医学、化学、废水处理、土壤修复、化学吸附、过滤、色谱等领域。
