Abstract
In this paper, we report graphene oxide (GO) supported Platinum(Pt)-Cobalt(Co) nanomaterials produced by a simple hydrothermal method after a series of water-ethanol treatments. To understand the change in chemical states, surface and crystal structure of the obtained Pt-Co@GO nanomaterials, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses were used. Pt-Co@GO nanomaterials exhibit a high adsorption effect in the methylene blue (MB) removal from the aqueous medium. The parameters including ultrasonic irradiation method contact time (1–90 min), initial dye concentration, temperature (293–323 K) and pH (4–10) were investigated for removal MB using Pt-Co@GO nano-adsorbent. The kinetic studies show that the MB adsorption processes can be described by pseudo-first-order, the pseudo-second-order model, and intraparticle diffusion. Thermodynamic activation functions including enthalpy change (ΔH0), Gibbs free energy change (ΔG0), and entropy change (ΔS0) were determined. The maximum adsorption capacity of the synthesized Pt-Co@GO nano-adsorbent reaches 273.6 mg/g under the condition that the pH 10, 318 K and the initial dye concentration is 3.0 × 10−5 M. It is understood from the obtained data, Pt-Co@GO nano-adsorbent has demonstrated to be an effective nano-adsorbent for removing MB under several parameters in aqueous solution by ultrasonic process systems.
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