Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Abstract

Experiments were conducted to investigate the use of graphene-oxide supported metallic nanocomposites for improving the degradation of trichloroethane (TCA) by sodium percarbonate (SPC). Two methods of production, chemical reduction (CR) and solvo-thermal (ST), were tested for preparation of single (Fe) and binary (Fe-Cu) nanocomposites supported by reduced graphene oxide (rGO). A variety of analytical techniques including N2 adsorption Brunauer-Emmett-Teller (BET), x-ray diffraction (XRD), fourier-transfrom infrared spectroscopy (FTIR), and transmisison electron microscopy (TEM) were applied to characterize the physicochemical and microstructural properties of the synthesized nanocomposites. The characterization indicated that the CR method produced nanocomposites that comprised only mesoporous structure. Conversely, both micro and mesoporous structures were present for samples produced with the ST method. The synthesized single and bimetallic composites produced from the ST method showed higher surface areas, i.e. 93.6 m2/g and 119.2 m2/g as compared to the ones synthesized via the CR method, i.e. 13.8 m2/g and 38.0 m2/g respectively. The results of FTIR and XRD analyses confirmed that the ST method produced highly crystalline nanocomposites. SEM and TEM analysis validated that metallic particles with definite morphology well distributed on the surface of rGO. X-ray photoelectron spectroscopy (XPS) analysis confirmed the homogeneity nanocomposites and occurrence of variation in copper oxidation states during degradation process. EDS mapping validate the homogeneous distribution of Cu and Fe at reduced graphene oxide surface. The Fe-Cu/rGO (ST) activated SPC system effectively degraded TCA (92%) in 2.5 h at low nanocomposite dose compared to the Fe-Cu/rGO (CR) and only Fe, for which the maximum degradation efficiencies achieved were 81% and 34%. In conclusion, excellent catalytic characteristics were observed for the ST-synthesized single and bimetallic (Fe/rGO, Fe-Cu/rGO) catalysts. These catalysts were successful in improving the degradation of TCA via activated SPC.

Unraveling the Beneficial Electrochemistry of IrO2/MoO3 Hybrid as a Highly Stable and Efficient Oxygen Evolution Reaction Catalyst

“…A 5 times increase in surface area of IM-30 as compared to state-of-the-art IrO 2 catalyst and a 16 times increase in surface area as compared to non-noble metal oxide MoO 3 prepared under the same conditions ensured the improvement in electrochemical properties of IM-30 composite as discussed later. After 30% molar concentration of iridium oxide, the surface area started decreasing due to the increasing number of large size particles of molybdenum oxide crystals, coinciding with previously reported works. ,, …”

“…After 30% molar concentration of iridium oxide, the surface area started decreasing due to the increasing number of large size particles of molybdenum oxide crystals, coinciding with previously reported works. 12,29,30 In order to clearly distinguish the iridium and molybdenum oxide particles, HAADF-STEM and EDX elemental mapping are shown in Figure 3 and Figure S5. Figure 3a,b represents the HAADF-STEM image of IM-30 at different positions and different magnifications.…”

Unraveling the facile reproducible modeled approach for bifunctional catalytic decorated polydopamine coated sponge composite for hydrogen generation

“…Figure 6A is showing the adsorption‐desorption isotherm for pristine wood pulp sponge. It follows the physisorption isotherm type II recommended by international union of pure and applied chemistry (IUPAC) which signifies the typical characteristics of micro‐mesoporous type materials 66,67 . Moreover, particle size distribution curve for pristine wood pulp sponge is shown in Figure 6B.…”

“…It follows the physisorption isotherm type II recommended by international union of pure and applied chemistry (IUPAC) which signifies the typical characteristics of micro-mesoporous type materials. 66,67 Moreover, particle size distribution curve for pristine wood pulp sponge is shown in Figure 6B. Indeed, micropores domain is considered to be comprised of pores with diameters of less than 2 nm, whereas the mesopores comprise diameters between 2 and 50 nm.…”

Binary Dye Removal from Simulated Wastewater Using Reduced Graphene Oxide Loaded with Fe-Cu Bimetallic Nanocomposites Combined with an Artificial Neural Network

“…Hou et al [11] investigated the decolorization of toxic bright green dye in the aqueous phase by reduced graphene oxide loaded with mesoporous Pd-Fe bimetallic magnetic nanoparticles, and their results indicated that the material was an effective mesoporous material for the purification of wastewater containing a high concentration of dyes. Farooq et al [12] selected tricarboxylic acids as model chlorinated organic compounds to examine the catalytic activity of mono-and bimetallic (Fe and Fe-Cu) heterogeneous nanocomposites supported by reduced graphene oxide. The influence of the synthesis methodology on the properties and activity of the heterogeneous composites was also investigated, and its excessive effect in improving Fenton-based AOPs was determined.…”