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Graphene Oxide Nanofiltration Membranes Silver Nanoparticles

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Graphene Oxide Nanofiltration Membranes Silver Nanoparticles ( graphene-oxide-nanofiltration-membranes-silver-nanoparticles )

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Nanomaterials 2020, 10, 454 Nanomaterials 2020, 10, x FOR PEER REVIEW 9 of 13 Nanomaterials 2020, 10, x FOR PEER REVIEW 10 of 14 HHowowevevverer,r, w,whenentththessiizizeeooffAgNPss iincreased tto 3nm,,poorreevvoolulumeedececrcrereaeasasesededthtthohouougughghppoporoerrewe widiidtdhtth wwaasassllaalrargrgegererrtththaanantththaatttooffGO--2-200..These data proviideffurtthersuporrtrttffoforrtththeeddeececlcilnliineneiniinfifilftilrltatrrtaitotiinonabaibliitllyiitty o ofof GfGGO O O--3 3-3 3 3.3. . 10 of 14 Scheme 2. Schematic diagram indicating the separation mechanism of (a) GO-8 (b) GO-20 (c) GO-33 Scheme 2. Schematic diagram indicating the separation mechanism of (a) GO-8 (b) GO-20 (c) GO-33 Scheme 2. Schematic diagram indicating the separation mechanism of (a) GO-8 (b) GO-20 (c) GO-33 membranes. membranes. membranes. Figure 8. Barrett-Joyner-Halenda (BJH) adsorption pore distribution spectra of (a) GO, (b) GO-8, (c) GO-20 and (d) GO-33 membranes. Fiigurree8.. Barrettt--JJoynerr--Halleendaa(B(BJHJH))aaddsosorprptitoionnpporoeredidsitsrtibriubtuiotinonspsepcetrcatroafo(fa)(aG)OG,O(b,)(bG)OG-8O,-(8c,) (Gc)OG-O20-2a0nadn(d)(dG)OG-O33-3m3 emebmrabnraens.es. The influence of feed concentration on rejection is shown in Figure 9a. The feed concentration of RhBTshoeluintiflouneinsc2e0omf gfe/eLd, 4c0omncge/nLt,rantidon60onmrge/jLe,crtieosnpeisctsivheolwy.nTihneFriegjeucrteio9na.isTnheegfaeteivdelcyoncocerrnetlratteidontoof The influence of feed concentration on rejection is shown in Figure 9a. The feed concentration of the feed concentration of RhB solution. With the feed concentration increases, the rejection rate RhB solution is 20 mg/L, 40 mg/L, and 60 mg/L, respectively. The rejection is negatively correlated RhB solution is 20 mg/L, 40 mg/L, and 60 mg/L, respectively. The rejection is negatively correlated to declines sharply. When the feed concentration is 20 mg/L, the rejection rate of GO-8, GO-20, and GO- to the feed concentration of RhB solution. With the feed concentration increases, the rejection rate the feed concentration of RhB solution. With the feed concentration increases, the rejection rate 33 is 85.99%, 96.00%, and 91.53%, respectively. When it increases to 60 mg/L, the rejection of three declines sharply. When the feed concentration is 20 mg/L, the rejection rate of GO-8, GO-20, and GO-33 declines sharply. When the feed concentration is 20 mg/L, the rejection rate of GO-8, GO-20, and GO- types of composite membranes drop to 49.40%, 57.36%, and 50.16%, which decreases by 36.59%, is 85.99%, 96.00%, and 91.53%, respectively. When it increases to 60 mg/L, the rejection of three types 33 is 85.99%, 96.00%, and 91.53%, respectively. When it increases to 60 mg/L, the rejection of three 38.64%, and 41.37%. Higher feed concentration increases the permeation speed of RhB, resulting in of composite membranes drop to 49.40%, 57.36%, and 50.16%, which decreases by 36.59%, 38.64%, types of composite membranes drop to 49.40%, 57.36%, and 50.16%, which decreases by 36.59%, stronger solute diffusion effect, which causes lower rejection during nanofiltration progress. The flux and 41.37%. Higher feed concentration increases the permeation speed of RhB, resulting in stronger 38.64%, and 41.37%. Higher feed concentration increases the permeation speed of RhB, resulting in of common solvents through GO-20 was investigated in Figure 9b. The viscosity of methanol, ethanol solute diffusion effect, which causes lower rejection during nanofiltration progress. The flux of common stronger solute diffusion effect, which causes lower rejection during nanofiltration progress. The flux and ethylene glycol are 0.60 mPa·s, 1.17 mPa·s, and 19.9 mPa·s, respectively. The flux of methanol, solvents through GO-20 was investigated in Figure 9b. The viscosity of methanol, ethanol and ethylene of common solvents through GO-20 was investigated in Figure 9b. The viscosity of methanol, ethanol and ethylene glycol are 0.60 mPa·s, 1.17 mPa·s, and 19.9 mPa·s, respectively. The flux of methanol,

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