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Vis spectra of GO. After AgNP modification of GO, the UV-Vis spectra of GO-8, GO-20 and GO-33 all have a characteristic peak of AgNP at 398 nm, 406 nm, and 410 nm. The characteristic peak range all have a characteristic peak of AgNP at 398 nm, 406 nm, and 410 nm. The characteristic peak range of AgNP is between 398 nm and 420 nm, and shifts to larger wavelength with increasing size of AgNP, of AgNP is between 398 nm and 420 nm, and shifts to larger wavelength with increasing size of AgNP, which is consistent with TEM image (Figure 2b–d) and size distribution (Figure 2f–h).The XRD which is consistent with TEM image (Figure 2b–d) and size distribution (Figure 2f–h).The XRD patterns of GO and three types of GO/AgNP composites are shown in Figure 3b. The characteristic patterns of GO and three types of GO/AgNP composites are shown in Figure 3b. The characteristic peak of GO can be observed at 2θ = 11.02°. The peaks at 2θ = 38.16°, 44.28°, 64.28°, and 77.42° are Nanomaterials 2020, 10, 454 5 of 13 peak of GO can be observed at 2θ = 11.02°. The peaks at 2θ = 38.16°, 44.28°, 64.28°, and 77.42° are assigned to the (111), (200), (220), and (311) reflection of Ag. assigned to the (111), (200), (220), and (311) reflection of Ag. Figure 1. (a) FTIR (b) Raman spectra of GO and GO/AgNP composites. Figure 1. (a) FTIR (b) Raman spectra of GO and GO/AgNP composites. Figure 1. (a) FTIR (b) Raman spectra of GO and GO/AgNP composites. Figure 2. TEM images of (a) GO, and (b–d), three types of GO/AgNPs composites; (e) An HRTEM Figure 2. TEM images of (a) GO, and (b–d), three types of GO/AgNPs composites; (e) An HRTEM Fimigaugreo2f.ATgENMPismloaagdeesdoofn(aG)OG;O(f,–ahn)dsh(bo–wd)s,iztherdeiestryibpuestionfsGoOf/tAhrgeNePtyspceosmopfGosOit/eAs;g(Ne)PAconmHpRoTsiEteMs. image of AgNPs loaded on GO; (f–h) show size distributions of three types of GO/AgNP composites. image of AgNPs loaded on GO; (f–h) show size distributions of three types of GO/AgNP composites. Nanomaterials 2020, 10, x FOR PEER REVIEW 6 of 14 Figure 3. UV-Vis absorption spectra (a) and XRD patterns (b) of GO, GO-8, GO-20 and GO-33 composite. Figure 3. UV-Vis absorption spectra (a) and XRD patterns (b) of GO, GO-8, GO-20 and GO-33 composite. The morphology and structure of GO and GO/AgNP composite membranes was characterized by SEM. As shown in Figure 4a, there are wrinkles on the surfaces of GO sheets due to oxygen-containing The morphology and structure of GO and GO/AgNP composite membranes was characterized groups. Figure 4c–d shows the top view image of three types of GO/AgNP composite membranes; by SEM. As shown in Figure 4a, there are wrinkles on the surfaces of GO sheets due to oxygen- the different sized of AgNPs can be easily observed in these micrographs. The cross-sectional SEM containing groups. Figure 4c–d shows the top view image of three types of GO/AgNP composite membranes; the different sized of AgNPs can be easily observed in these micrographs. The cross- sectional SEM image of the GO membrane (Figure 4e) shows its layered structure. The cross-sectional SEM image of the three types of GO/AgNP composite membranes are shown in Figure 4f–h. The GO layers are tightly locked between AgNPs, and there are more wrinkles observed in the cross section of all three types of GO/AgNP composite membranes compared to the GO membrane. ThesePDF Image | Graphene Oxide Nanofiltration Membranes Silver Nanoparticles
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