Federal Institute of Education, Science and Technology of Piauí, Teresina-Central Campus, IFPI, Teresina 64000-040, PI, Brazil.
Federal Institute of Education, Science and Technology of Rio Grande do Norte, Nova Cruz Campus, IFRN, Nova Cruz 59215-000, RN, Brazil.
Molecules. 2017 Nov 22;22(11):2039. doi: 10.3390/molecules22112039.
Cellulose derivatives have been widely used as adsorbents for the removal of micropollutants such as drugs, dyes, and metals, due to their abundance, low cost and non-contaminating nature. In this context, several studies have been performed searching for new adsorbents (cellulose derivatives) efficient at contaminant removal from aqueous solutions. Thus, a new adsorbent was synthesized by chemical modification of cellulose with ethylenediamine in the absence of solvent and applied to the adsorption of amitriptyline (AMI) in aqueous solution. The modification reaction was confirmed by X-ray Diffraction (XRD), elemental analysis, Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetry/Differential Scanning Calorimeter (TG/DSC), solid state Nuclear Magnetic Resonance of ¹H and C (¹H-NMR and C-NMR). Moreover, the effectiveness of reaction was confirmed by computational calculations using Density Functional Theory (DFT) at level B3LYP/6-31G(d). This adsorption process was influenced by pH, time, concentration, temperature and did not show significant changes due to the ionic strength variation. Through these experiments, it was observed that the maximum adsorption capacity of AMI by CN polymer at 298 K, 300 min, and pH 7 was 87.66 ± 0.60 mg·g.
纤维素衍生物由于其丰富的资源、低廉的成本和非污染性，已被广泛用作去除药物、染料和金属等微量污染物的吸附剂。在这种情况下，已经进行了许多研究，以寻找新的吸附剂（纤维素衍生物），从水溶液中有效去除污染物。因此，通过在无溶剂存在的情况下用乙二胺对纤维素进行化学修饰，合成了一种新的吸附剂，并将其应用于水溶液中阿米替林（AMI）的吸附。通过 X 射线衍射（XRD）、元素分析、傅里叶变换红外光谱（FTIR）、热重/差示扫描量热法（TG/DSC）、¹H 和 C 的固态核磁共振（¹H-NMR 和 C-NMR）证实了修饰反应。此外，通过使用密度泛函理论（DFT）在 B3LYP/6-31G(d)水平上进行计算计算，证实了反应的有效性。该吸附过程受 pH 值、时间、浓度、温度的影响，由于离子强度的变化，没有发生明显变化。通过这些实验，观察到在 298 K、300 min 和 pH 7 下，CN 聚合物对 AMI 的最大吸附容量为 87.66 ± 0.60 mg·g。
