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

Christelle Wong; Chin Lai; Kian Lee; Sharifah Hamid

doi:10.3390/ma8105363

journal article Open Access Oct 19, 2015

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

Christelle Wong Chin Lai Kian Lee Sharifah Hamid

Materials Vol. 8 No. 10 pp. 7118-7128 · MDPI AG

View at Publisher Save 10.3390/ma8105363

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.

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Details

Published: Oct 19, 2015
Vol/Issue: 8(10)
Pages: 7118-7128
License: View

Authors

C

Christelle Wong

Nanotechnology & Catalysis Research Centre (NANOCAT), Level 3, Block A, IPS Building, University of Malaya (UM), Kuala Lumpur 50603, Malaysia

C

Chin Lai

Nanotechnology & Catalysis Research Centre (NANOCAT), Level 3, Block A, IPS Building, University of Malaya (UM), Kuala Lumpur 50603, Malaysia

K

Kian Lee

Nanotechnology & Catalysis Research Centre (NANOCAT), Level 3, Block A, IPS Building, University of Malaya (UM), Kuala Lumpur 50603, Malaysia

S

Sharifah Hamid

Nanotechnology & Catalysis Research Centre (NANOCAT), Level 3, Block A, IPS Building, University of Malaya (UM), Kuala Lumpur 50603, Malaysia

Funding

High Impact Research Chancellery Grant, University of Malaya Award: UM.C/625/1/HIR/228 (J55001-73873)

Cite This Article

Christelle Wong, Chin Lai, Kian Lee, et al. (2015). Advanced Chemical Reduction of Reduced Graphene Oxide and Its Photocatalytic Activity in Degrading Reactive Black 5. Materials, 8(10), 7118-7128. https://doi.org/10.3390/ma8105363

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

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