Instituto de Tecnología de Materiales, Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.
Center for Surface Science and Nanotechnology, University Politehnica of Bucharest, 316 Splaiul Independentei, 060042 Bucharest, Romania.
Int J Mol Sci. 2023 Feb 15;24(4):3865. doi: 10.3390/ijms24043865.
Innovative dendrimer-modified graphene oxide (GO) aerogels are reported by employing generation 3.0 poly(amidoamine) (PAMAM) dendrimer and a combined synthesis approach based on the hydrothermal method and freeze-casting followed by lyophilization. The properties of modified aerogels were investigated with the dendrimer concentration and the addition of carbon nanotubes (CNTs) in varying ratios. Aerogel properties were evaluated via scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The obtained results indicated a strong correlation of the N content with the PAMAM/CNT ratio, where optimum values were revealed. The CO adsorption performance on the modified aerogels increased with the concentration of the dendrimer at an appropriate PAMAM/CNT ratio, reaching the value of 2.23 mmol g at PAMAM/CNT ratio of 0.6/0.12 (mg mL). The reported results confirm that CNTs could be exploited to improve the functionalization/reduction degree in PAMAM-modified GO aerogels for CO capture.
采用第三代聚（酰胺-胺）（PAMAM）树状大分子和水热法与冷冻铸造相结合的方法，制备了创新性的树枝状大分子修饰氧化石墨烯（GO）气凝胶。通过改变树枝状大分子浓度和添加不同比例的碳纳米管（CNTs）来研究修饰气凝胶的性能。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、拉曼光谱和 X 射线光电子能谱（XPS）对气凝胶的性能进行了评估。结果表明，N 含量与 PAMAM/CNT 比之间存在很强的相关性，其中显示出了最佳值。在适当的 PAMAM/CNT 比下，改性气凝胶对 CO 的吸附性能随树枝状大分子浓度的增加而增加，在 PAMAM/CNT 比为 0.6/0.12（mg mL）时达到 2.23 mmol g 的值。报道的结果证实，CNTs 可用于改善 PAMAM 修饰 GO 气凝胶的功能化/还原程度，以用于 CO 捕获。
