Facile and Highly Efficient Fabrication of Graphene Oxide based Polymer Nanocomposites through Mussel Inspired Chemistry and Their Environmental Pollutant Removal Application
Qing Wana,#, Meiying Liua,#, Yili Xiea, Jianwen Tiana, Qiang Huanga, Fengjie Denga,*, Liucheng Maoa, Qingsong Zhangb, Xiaoyong Zhanga,*, Yen Weib,*
a Department of Chemistry and Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.b Department of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing, 100084, P. R. China.
Results
As shown in Fig S1, the clear signal peaks of respective elements in the Go-based nanocomposites are analyzed. The signal peak of S2p in the GO sample located at 169 eV, which is ascribed to the introduction of S=O via chemical oxidation by strong acid. When PDA film coated onto GO surface, the signal peak of S element is weaken, it could be explained that incident photon of XPS is impeded into the interior of GO-PDA samples due to the formation of PDA film on the GO surface, leading to the incapable detection of S signal peak. It can thus confirm that successful surface modification of GO via mussel inspired chemistry. Interestingly, the signal peak of S is appeared again (166 eV) in the GO-PDA-PSPSH samples, it is ascribed to the prosperous implantation of NH2-PSPSH onto the GO surface. The XPS spectra of C1s in the GO-based nanomaterials are also analyzed in Fig S1B, four kinds of signal peaks can be observed in the GO sample, which are divided into 284.7 eV (C-H and C-C), 286.6 eV (C-O) and 288.6 eV (C=O). the only obvious signal peak at 284.7 eV in GO-PDA sample can be observed, which is ascribed to the C-H and C-C of PDA film, also evidenced that PDA could attached on the GO surface. For the spectrum of GO-PDA-PSPSH, the three signal peaks are re-emerged, and the C signal peak is stronger than GO sample, demonstrating successful fabrication of GO-based polymer composites in this work. as shown in Fig S1C, the intensity of N1s (339.5 eV) peak is stronger comparing with GO sample, also confirm that GO surface is functionalized by the PDA film. The signal peak of O1s (531.9 eV) for the GO-PDA-PSPSH sample is the strongest in three samples, which is shown in Fig S1D, the increased intensity of signal peak is caused by the introduction of functional polymer, which is constituted by the C and O elements. Therefore, we can conclude that prosperous surface modification of GO by the PDA and NH2-PSPSH via mussel inspired chemistry and Michael addition reaction.
Fig S1 The detailed XPS Spectra of GO, GO-PDA and GO-PDA-PSPSH. (A) S2p, (B) C1s, (C) N1s and (D) O1s region.
Fig. S2 Comparison the adsorption capability of unmodified GO and GO-PDA-PSPSH.