Adsorptive Removal of As(V) from Aqueous Solution onto Steel Slag Recovered Iron – Chitosan Composite: Response Surface Modeling and Kinetics

Authors

  • Vijayanand Nagarajan
    Affiliation

    Department of Chemistry, Paavai Engineering College (Autonomous), Anna University, NH-44 Paavai Nagar, 637 018 Namakkal, Tamil Nadu, India

  • Raja Ganesan
    Affiliation

    Department of Chemistry, Paavai Engineering College (Autonomous), Anna University, NH-44 Paavai Nagar, 637 018 Namakkal, Tamil Nadu, India

  • Srinivasan Govindan
    Affiliation

    Department of Chemical Engineering, Paavai Engineering College (Autonomous), Anna University, NH-44 Paavai Nagar, 637 018 Namakkal, Tamil Nadu, India

  • Prabha Govindaraj
    Affiliation

    Department of Applied Science and Technology, Alagappa College of Technology, Anna University, Kotturpuram, 600025 Chennai, Tamil Nadu, India

https://doi.org/10.3311/PPch.17208

Abstract

In the present work iron particles was recovered by dry magnetic separation, from waste steel slag, doped with chitosan for adsorbent prepared, characterized and evaluated for the removal of As(V) from an aqueous solution. The adsorption of As(V) was optimized by using response surface methodology through Box-Behnken design model, which gave high correlation coefficient (R2 = 0.9175), and a predictive model of quadratic polynomial equation. Analysis of variance and Fischer's F-test were used to govern the parameters which interrupt the adsorption of As(V).The adsorbent was characterized by FTIR, XRD and SEM. Optimal conditions, including adsorbent dosage, pH, temperature, initial ion concentration and contact time for the removal of As(V), were found to be 0.8 g, pH 4, 308 K, 10 mg L−1 and 3 h, respectively. Langmuir isotherm model fitted better compared to the Freundlich model having a maximum adsorption capacity of 11.76 mg g−1, a high regression coefficient value of 0.993 and least chi-square value of 0.1959. The process was found to follow monolayer adsorption and pseudo-second-order kinetics. Thermodynamic parameters such as ∆S, ∆H and ∆G indicated the feasibility, spontaneous and endothermic nature of adsorption. Successful regeneration of the adsorbent implies its applicability to the removal of arsenic from real life wastewater.

Keywords:

arsenic, steel slag, chitosan, thermodynamic, response surface methodology

Published Online

2021-01-15

How to Cite

Nagarajan, V., Ganesan, R., Govindan, S., Govindaraj, P. “Adsorptive Removal of As(V) from Aqueous Solution onto Steel Slag Recovered Iron – Chitosan Composite: Response Surface Modeling and Kinetics”, Periodica Polytechnica Chemical Engineering, 65(2), pp. 270–280, 2021. https://doi.org/10.3311/PPch.17208

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Articles