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Information Journal Paper

Title

Statistical Optimization and Modeling of Methylene Blue Adsorption Onto Graphene Oxide in Batch and Fixed-Bed Column

Pages

  21-34

Abstract

 The batch and Fixed-bed column adsorption of Methylene blue (MB), a widely used toxic dye, onto Graphene oxide (GO) was investigated in this study. GO was synthesized using modified Hummers method and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Response surface methodology (RSM) was employed to optimize batch and Fixed-bed column adsorption of MB. Batch adsorption experiments were carried out by central composite design (CCD) with three input parameters including initial MB concentration (C0: 50-350 mg/L), GO dosage (D: 0. 05-0. 7 g/L), and pH (pH: 3-9). The adsorption capacity of GO for MB removal in the optimum level of factors (C0: 50 mg/L, D: 0. 05 g/L, and pH: 8. 5) was predicted by the model to be 700 mg/g. Adsorption kinetic data were tested using pseudo-first order, pseudo-second order, and intraparticle diffusion models. The kinetic experimental data was well fitted with pseudo-second order kinetic model (R2=1). The adsorption of MB onto GO demonstrated that Langmuir model (R2=0. 999) could better fit the adsorption data than the Freundlich model (R2=0. 914). Thermodynamic parameters including enthalpy (Δ H), Gibbs free energy (Δ G), and entropy (Δ S) were also investigated. Positive value of Δ H and negative value of Δ G indicated the endothermic and spontaneous nature of the adsorption. The positive value of Δ S also showed increased randomness at the solid/liquid interface during the adsorption of MB onto GO. The Real wastewater experiment at optimum conditions showed high performance of adsorbent in the presence of other ions. Fixed-bed column experiments were designed using a three-factor, three-level Box-Behnken design (BBD) to investigate the single and combined effects of influent concentration (Cinf: 50-200 mg/L), flow rate (Q: 0. 25-0. 8 mL/min), and bed height (BH: 3-7 cm). MB removal from GO in the optimum levels of factors (Cinf: 51 mg/L, BH: 5. 7 cm, and Q: 0. 25 mL/min) was predicted by the model to be 86% (qe=459. 3 mg/g). Fixed-bed experimental data were also fitted well to the Thomas and BDST models. The results showed that GO can be used as an efficient adsorbent for batch and fixed-bed adsorption of cationic dyes from synthetic and Real wastewater.

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    • Cite

    APA: Copy

    Koulivand, Habib, & SHAHBAZI, AFSANEH. (2018). Statistical Optimization and Modeling of Methylene Blue Adsorption Onto Graphene Oxide in Batch and Fixed-Bed Column. AVICENNA JOURNAL OF ENVIRONMENTAL HEALTH ENGINEERING, 5(1), 21-34. SID. https://sid.ir/paper/348151/en

    Vancouver: Copy

    Koulivand Habib, SHAHBAZI AFSANEH. Statistical Optimization and Modeling of Methylene Blue Adsorption Onto Graphene Oxide in Batch and Fixed-Bed Column. AVICENNA JOURNAL OF ENVIRONMENTAL HEALTH ENGINEERING[Internet]. 2018;5(1):21-34. Available from: https://sid.ir/paper/348151/en

    IEEE: Copy

    Habib Koulivand, and AFSANEH SHAHBAZI, “Statistical Optimization and Modeling of Methylene Blue Adsorption Onto Graphene Oxide in Batch and Fixed-Bed Column,” AVICENNA JOURNAL OF ENVIRONMENTAL HEALTH ENGINEERING, vol. 5, no. 1, pp. 21–34, 2018, [Online]. Available: https://sid.ir/paper/348151/en

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