Advanced Chemical Reduction of Reduced Graphene Oxide and Its Photocatalytic Activity in Degrading Reactive Black 5

Abstract

Textile industries consume large volumes of water for dye processing, leading to undesirable toxic dyes in water bodies. Dyestuffs are harmful to human health and aquatic life, and such illnesses as cholera, dysentery, hepatitis A, and hinder the photosynthetic activity of aquatic plants. To overcome this environmental problem, the advanced oxidation process is a promising technique to mineralize a wide range of dyes in water systems. In this work, reduced graphene oxide (rGO) was prepared via an advanced chemical reduction route, and its photocatalytic activity was tested by photodegrading Reactive Black 5 (RB5) dye in aqueous solution. rGO was synthesized by dispersing the graphite oxide into the water to form a graphene oxide (GO) solution followed by the addition of hydrazine. Graphite oxide was prepared using a modified Hummers’ method by using potassium permanganate and concentrated sulphuric acid. The resulted rGO nanoparticles were characterized using ultraviolet-visible spectrophotometry (UV-Vis), X-ray powder diffraction (XRD), Raman, and Scanning Electron Microscopy (SEM) to further investigate their chemical properties. A characteristic peak of rGO-48 h (275 cm−1) was observed in the UV spectrum. Further, the appearance of a broad peak (002), centred at 2θ = 24.1°, in XRD showing that graphene oxide was reduced to rGO. Based on our results, it was found that the resulted rGO-48 h nanoparticles achieved 49% photodecolorization of RB5 under UV irradiation at pH 3 in 60 min. This was attributed to the high and efficient electron transport behaviors of rGO between aromatic regions of rGO and RB5 molecules.

Structure and electron field emission properties of ion beam reduced graphene oxide sheets

“…It is observed that the pristine GO sheets show plane structure due to the presence of oxygen functional groups, whereas the ion irradiated GO sheets show layered structure. The GO sheets irradiated with 1 Â 10 14 ions/cm 2 shows less layered structure, which might be due to the insufficient fluence to remove the oxygen functional groups that attached at the edge and basal plane of GO layers [27]. However at high fluence, more number of oxygen removed from GO sheets, as evidenced from the RRBS measurement, hence the more layered structure is seen in GO sheets irradiated with 1 Â 10 16 ions/cm 2 .…”

Looking into the Future: Toward Advanced 3D Biomaterials for Stem‐Cell‐Based Regenerative Medicine

“…Nevertheless, there are still some limits to the use of these scaffolds. First, inorganic materials are much harder to degrade, especially bulk materials, which could limit their clinical application. Second, these materials are usually bulk structures that are typically opaque inside the structure so that they have poor light transmission properties, making in situ imaging difficult …”

Photoluminescence of Reduced Graphene Oxide Prepared from Old Coconut Shell with Carbonization Process at Varying Temperatures

“…Red-to-near-infrared PL emitted from chemically-reduced GO has been reported, consistent with increasing disorder length scale with reduction [7]. The rGO has been widely applied in energy storage devices, photovoltaics devices, corrosion protection, and lubricants [8]. In this study, we are investigating the optical properties of rGO prepared from old coconut shell using photoluminescence (PL) spectroscopy.…”