Surface functionalization of graphene oxide using amino silane magnetic nanocomposite for Chromium (VI) removal and bacterial treatment

Abstract

Amino silane magnetic nanocomposite decorated on graphene oxide (GO-Fe3O4-APTES) was successfully prepared by organic transformation reaction followed by co-precipitation method. The nanocomposite was characterised by using FT-IR, XRD, FE-SEM, TEM, EDS mapping, VSM, Raman spectroscopy, BET surface area analyzer, Zeta potential and UV-visible spectrophotometer. From TEM results we observed that 8 nm sized particles successfully modified on GO surface. The surface area of GO-Fe3O4-APTES was 57.9 m2 g−1. The magnetic Saturation value of GO-Fe3O4-APTES was 30.6 emu g−1 and the S-like magnetization of all the samples shows super paramagnetic in nature. Due to magnetic nature adsorbent, it could be easily separated from aqueous solution. GO-Fe3O4-APTES material was highly selective for Chromium (VI) removal from aqueous solution. About 91% of Chromium (VI) was removed at pH 3, 160 rpm of shaking speed, 0.3 g l−1 of adsorbent dose and 10 h of contact time. The adsorption process of Chromium (VI) on GO-Fe3O4-APTES follows Pseudo-second-order kinetic and Langmuir isotherm model because of high coefficient of determination value (R2 = 0.99). The maximum adsorption capacity (q m ) of GO-Fe3O4- APTES was observed at 60.53 mg g−1. The synthesized material was desorbed with 0.5 M NaOH and recycled up to five cycles. After five cycles, the removal efficiency of Chromium (VI) possesses high efficacy towards GO-Fe3O4-APTES. Mechanistically, adsorption of Chromium (VI) follows strong electrostatic attraction between adsorbate and adsorbent. GO-Fe3O4-APTES has potential adsorbent for the adsorption of Chromium (VI) in waste water treatment. Furthermore, the GO-Fe3O4-APTES were tested for antibacterial properties against gram negative (Escherichia coli) and gram positive (Bacillus subtilis) bacterial strain. The synthesized material responds positively towards antibacterial activity.

Derivatization of graphene oxide nanosheets with tunable nitric oxide release for antibacterial biomaterials

“…Concurrently, aminosilylated GO‐(NH 2 ) x materials all showed higher surface charge at acidic pHs, likely due to the increased N/C atomic ratio (Table S5) and formation of cationic amine residues via interactions of the silanes (Figure S1). Notably, increased surface aminosilylation (corresponding to increased APTES ratio) decreased the range observed throughout the varying pH environments and is consistent with prior literature 39 . Further surface thiolation via aminolysis reaction with NAPTH, significantly lowered surface charge with the GO‐(NH 2 ) x ‐SH analogs (Figure 3).…”

(3-Aminopropyl) Triethoxysilane (APTES) Functionalized Magnetic Nanosilica Graphene Oxide (MGO) Nanocomposite for the Comparative Adsorption of the Heavy Metal [Pb(II), Cd(II) and Ni(II)] Ions from Aqueous Solution

“…This therefore indicates that the adsorption of Pb(II), Cd(II) and Ni(II) from aqueous solution will be greatly enhanced following the increased pore volume and large surface area of Fe3O4@SiO2-NH2/GO. The reduction in pore diameter with increase in surface area and pore volume is characteristic with literature studies [38,39]. Fig.…”

Fabrication of Multiresponsive Magnetic Nanocomposite Double‐Network Hydrogels for Controlled Release Applications

“…[ 96 ] Furthermore, the absorption band at 2916 cm −1 was attributed to CH stretching due to the hydrocarbon chains of the grafted APTES, [ 97 ] and the broad peak at 3413 cm −1 was attributed to NH 2 stretching vibration (Figure S2b, Supporting Information). [ 96,98 ] The NH 2 stretching vibration signal was overlapped with the OH stretching vibration signal, while the modification of the amine group can still be confirmed by the absorption peaks of CH and SiO. The amine groups on the surface of IOPs_NH 2 can be quantified using ninhydrin test, [ 99 ] showing that the amount of amine groups was ≈0.003 mmol mg −1 (Figure S2c, Supporting Information).…”