Marwani Hadi M, Ahmad Shahid, Rahman Mohammed M
Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Gels. 2022 Jan 28;8(2):86. doi: 10.3390/gels8020086.
In the present study, a biopolymer nanocomposite hydrogel based on gelatin and tin-doped gadolinium oxide (Sn-GdO@GH) was prepared for the efficient reduction of water pollutants. The method of Sn-GdO@GH preparation consisted of two steps. A Sn-GdO nanomaterial was synthesized by a hydrothermal method and mixed with a hot aqueous solution (T > 60 °C) of gelatin polymer, followed by cross-linking. Due to the presence of abundant functional groups on the skeleton of gelatin, such as carboxylic acid (-COOH) and hydroxyl (-OH), it was easily cross-linked with formaldehyde. The structure, morphology, and composition of Sn-GdO@GH were further characterized by the FESEM, XRD, EDX, and FTIR techniques. The FESEM images located the distribution of the Sn-GdO nanomaterial in a GH matrix of 30.06 nm. The XRD patterns confirmed the cubic crystalline structure of GdO in a nanocomposite hydrogel, while EDS elucidated the elemental composition of pure Sn-GdO powder and cross-linked the Sn-GdO@GH samples. The synthesized Sn-GdO@GH nanocomposite was used for the removal of different azo dyes and nitrophenols (NPs). It exhibited an efficient catalytic reduction of Congo red (CR) with a reaction rate of 9.15 × 10 min with a strong NaBH-reducing agent. Moreover, the Sn-GdO@GH could be easily recovered by discharging the reduced (colourless) dye, and it could be reused for a fresh cycle.
在本研究中，制备了一种基于明胶和锡掺杂氧化钆（Sn-GdO@GH）的生物聚合物纳米复合水凝胶，用于高效还原水污染物。Sn-GdO@GH的制备方法包括两个步骤。通过水热法合成Sn-GdO纳米材料，并与明胶聚合物的热水溶液（T>60°C）混合，然后进行交联。由于明胶骨架上存在丰富的官能团，如羧酸（-COOH）和羟基（-OH），它很容易与甲醛交联。通过场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）、能谱分析（EDX）和傅里叶变换红外光谱（FTIR）技术进一步表征了Sn-GdO@GH的结构、形态和组成。FESEM图像显示Sn-GdO纳米材料分布在30.06nm的GH基质中。XRD图谱证实了纳米复合水凝胶中GdO的立方晶体结构，而能谱分析阐明了纯Sn-GdO粉末的元素组成，并对Sn-GdO@GH样品进行了交联。合成的Sn-GdO@GH纳米复合材料用于去除不同的偶氮染料和硝基酚（NPs）。它在强NaBH还原剂存在下，对刚果红（CR）表现出高效的催化还原作用，反应速率为9.15×10 min。此外，通过排出还原后的（无色）染料，Sn-GdO@GH可以很容易地回收，并可用于新的循环。
