Kim Taehee, Parale Vinayak G, Jung Hae-Noo-Ree, Kim Younghun, Driss Zied, Driss Dorra, Bouabidi Abdallah, Euchy Souhir, Park Hyung-Ho
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
Laboratory of Electromechanical Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax, PO Box 1173, Route Soukra km 3.5, 3038 Sfax, Tunisia.
Nanomaterials (Basel). 2019 Mar 4;9(3):358. doi: 10.3390/nano9030358.
SnO₂ aerogel/reduced graphene oxide (rGO) nanocomposites were synthesized using the sol⁻gel method. A homogeneous dispersion of graphene oxide (GO) flakes in a tin precursor solution was captured in a three-dimensional network SnO₂ aerogel matrix and successively underwent supercritical alcohol drying followed by the in situ thermal reduction of GO, resulting in SnO₂ aerogel/rGO nanocomposites. The chemical interaction between aerogel matrix and GO functional groups was confirmed by a peak shift in the Fourier transform infrared spectra and a change in the optical bandgap of the diffuse reflectance spectra. The role of rGO in 3D aerogel structure was studied in terms of photocatalytic activity with detailed mechanism of the enhancement such as electron transfer between the GO and SnO₂. In addition, the photocatalytic activity of these nanocomposites in the methyl orange degradation varied depending on the amount of rGO loading in the SnO₂ aerogel matrix; an appropriate amount of rGO was required for the highest enhancement in the photocatalytic activity of the SnO₂ aerogel. The proposed nanocomposites could be a useful solution against water pollutants.
采用溶胶 - 凝胶法合成了二氧化锡气凝胶/还原氧化石墨烯（rGO）纳米复合材料。氧化石墨烯（GO）薄片在锡前驱体溶液中的均匀分散体被捕获在三维网络二氧化锡气凝胶基质中，随后依次进行超临界醇干燥，接着对GO进行原位热还原，从而得到二氧化锡气凝胶/rGO纳米复合材料。通过傅里叶变换红外光谱中的峰位移动和漫反射光谱的光学带隙变化，证实了气凝胶基质与GO官能团之间的化学相互作用。从光催化活性方面研究了rGO在三维气凝胶结构中的作用，并详细探讨了其增强机制，如GO与二氧化锡之间的电子转移。此外，这些纳米复合材料在甲基橙降解中的光催化活性随二氧化锡气凝胶基质中rGO负载量的不同而变化；为使二氧化锡气凝胶的光催化活性得到最大增强，需要适量的rGO。所提出的纳米复合材料可能是解决水污染物问题的有效方案。
