Graphene oxide coated quartz sand as a high performance adsorption material in the application of water treatment

Abstract

In order to increase the water treatment performance, the quartz sand filter medium was improved by surface modification using a 3-aminopropyltriethoxy silane coupling agent (KH550), then GO was grafted to the surface of the sand though the chemical reaction between the functional groups. The interfacial interactions between the quartz sand surface and GO was studied. Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses showed that the GO binds strongly to the quartz sand surface.Scanning electronic microscopy (SEM) observation showed that a thin GO layer was formed on the surface of the modified quartz sand. The modified sand was used as a sorbent for the removal of turbidity, organic matter, Cd(II) and Pb(II) ions from large volumes of aqueous solutions. The results indicate that the GO plays an important role in improving the water treatment performance of a quartz sand filter.

Graphene quantum dots coated on quartz sand as efficient and low‐cost adsorbent for removal of Hg2+ and Pb2+ from aqueous solutions

“…In addition, the absorbance at 2927 and 1110 cm −1 are due to the CH and COH stretching vibration, respectively. The absorption peak at 1723 cm −1 may be due to the carbonyl CO groups in GQDs . In the case of GQDs|QS (curve B), the absorption bands at 720 and 1025 cm −1 are attributed to the symmetric SiOSi stretching and asymmetric SiO stretching, respectively.…”

“…To remove the previous residual Hg 21 and Pb 21 from the electrode surface, before the next analysis, a 0.6 V (for 120 s) as conditioning potential was applied to the electrode surface. Figure 5 shows the absorbance (A-D) and photoluminescence spectra (A 0 -D 0 ) of the synthesized GQDs in different carbonization times (15,30,45, and 60 min, respectively). By increasing the pyrolysis and carbonization time, diameter of GQDs grow up and UV-vis and PL spectra shift to the higher wavelengths [21] proving the growth of GQDs during the synthesis.…”

“…To facilitate the collection of adsorbents from the aqueous solutions, grapheneous materials could be coated on solids such as silica, polymers, magnetic materials, and quartz sand (QS) [10][11][12][13][14][15]. Due to availability and low cost, QS, and modified QS are suitable candidates for industrial removal of heavy metals.…”

Adsorptional photocatalytic mineralization of oxytetracycline and ampicillin antibiotics using Bi2O3/BiOCl supported on graphene sand composite and chitosan

“…In many cases, graphene and graphene oxide anchored onto river sand resulted in higher adsorption of organic phase pollutants [26].The photocatalysts were characterized using FESEM, TEM, HRTEM, XRD, EDX, RAMAN, BET and UV-visible diffuse reflectance analysis. The obtained BO/BOC nanoplates were well dispersed over graphene sand composite (GSC) and chitosan (CT) for improved photocatalytic activity for antibiotic degradation.…”

“…The diffraction peak at 26.63 was attributed to plane (002) of graphene like structure[32]. The major characteristic diffraction peaks of BiOCl at 12.02˚,26.00˚, 33.33˚, 34.00, 41.00˚ and 49.85˚ corresponded to {001}, {011}, {110}, {012}, {003} and {020} planes Fig.1 (a) and (b). The major characteristic diffraction peaks of BiOCl at 12.02˚,26.00˚, 33.33˚, 34.00, 41.00˚ and 49.85˚ corresponded to {001}, {011}, {110}, {012}, {003} and {020} planes Fig.1 (a) and (b).…”