TY - JOUR
T1 - Adsorption of methylene blue and rhodamine b on graphene oxide-Fe3O4 nanocomposite
T2 - Molecular dynamics and monte carlo simulations
AU - Narayanaswamy, Venkatesha
AU - Kumar, Hemant
AU - Srivastava, Chandan
AU - Alaabed, Sulaiman
AU - Aslam, Mohammed
AU - Mallya, Ambresh
AU - Obaidat, Ihab M.
N1 - Funding Information:
Acknowledgment: This work was financially supported by the UAEU Program for Advanced Research (UPAR) under the Grant no. 31S364.
Publisher Copyright:
© 2020 by American Scientific Publishers All rights reserved.
PY - 2020/3
Y1 - 2020/3
N2 - Graphene oxide based magnetic nanocomposite (GO-Fe3O4) was synthesized using the coprecipitation method. Intercalation of nanoparticles has resulted in the modified interlayer spacing of GO sheets, it is increased from 0.82 to 1.11 nm. Nanocomposite was characterized using TEM, AFM, XRD, UV-Visible and Raman spectroscopy. Magnetic nanocomposite is tested for removal of industrial dyes MB and RB through the adsorption process. The adsorbent dosage, dye concentration, and adsorption time are optimized in an optimal condition in the dye removal experiments (0.1 g/L adsorbent (GO), 10 mg/L of MB and RB with 25 minutes adsorption time). Adsorption capacity of 100 and 80 mg/g was achieved for MB and RB respectively. Preferential behavior of nanocomposite towards MB over RB can be attributed to the differential electrostatic and geometrical interactions. Differential behavior towards adsorption of dyes is further studied by Monte Carlo adsorption locator and molecular dynamics simulations. Adsorption energies corre ponding to MB/GO, RB/GO, MB/Fe3O4, and RB/Fe3O4 systems show that certain configurations favor adsorption on GO and Fe3O4 surfaces. Radial distribution function calculation shows the geometric separation of 2.23 and 5.13 Å for MB and RB respectively, which has profound effect on electrostatic and π–π interaction.
AB - Graphene oxide based magnetic nanocomposite (GO-Fe3O4) was synthesized using the coprecipitation method. Intercalation of nanoparticles has resulted in the modified interlayer spacing of GO sheets, it is increased from 0.82 to 1.11 nm. Nanocomposite was characterized using TEM, AFM, XRD, UV-Visible and Raman spectroscopy. Magnetic nanocomposite is tested for removal of industrial dyes MB and RB through the adsorption process. The adsorbent dosage, dye concentration, and adsorption time are optimized in an optimal condition in the dye removal experiments (0.1 g/L adsorbent (GO), 10 mg/L of MB and RB with 25 minutes adsorption time). Adsorption capacity of 100 and 80 mg/g was achieved for MB and RB respectively. Preferential behavior of nanocomposite towards MB over RB can be attributed to the differential electrostatic and geometrical interactions. Differential behavior towards adsorption of dyes is further studied by Monte Carlo adsorption locator and molecular dynamics simulations. Adsorption energies corre ponding to MB/GO, RB/GO, MB/Fe3O4, and RB/Fe3O4 systems show that certain configurations favor adsorption on GO and Fe3O4 surfaces. Radial distribution function calculation shows the geometric separation of 2.23 and 5.13 Å for MB and RB respectively, which has profound effect on electrostatic and π–π interaction.
KW - Adsorption Locator
KW - Molecular Dynamics
KW - Monte Carlo
KW - π–π Interaction
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U2 - 10.1166/mex.2020.1647
DO - 10.1166/mex.2020.1647
M3 - Article
AN - SCOPUS:85081215338
SN - 2158-5849
VL - 10
SP - 314
EP - 324
JO - Materials Express
JF - Materials Express
IS - 3
ER -