Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent

Authors

  • Mina Popović University of Belgrade, Institute of Chemistry, Technology, and Metallurgy, National Institute of Republic of Serbia
  • Zlate S. Veličković Military Academy, University of Defense
  • Jovica Bogdanov Military Academy, University of Defense
  • Aleksandar D. Marinković Faculty of Technology and Metallurgy, University of Belgrade
  • Mariano Casas Luna CEITEC Brno University of Technology
  • Isaak Trajković Innovation Center of the Faculty of Mechanical Engineering, University of Belgrade
  • Nina Obradović Institute of Technical Sciences of SASA
  • Vladimir Pavlović Institute of Technical Sciences of SASA; Faculty of Agriculture, University of Belgrade

Abstract

In this study, the structure, morphology and composition of the synthesized magnetite/3D-printed wollastonite (3D_W/M) composite were characterized, and its adsorption performance with respect to As(V) and Cr(VI) were studied. Magnetite (MG) modified 3D printed wollastonite was obtained by two step procedure: modification of 3D_W with 3-aminoproylsilane (APTES) followed by controlled magnetite (MG) deposition to obtain 3D_W/M adsorbent. The structure/properties of 3D_W/M were confirmed by applying FTIR, XRD, TGD/DTA, and SEM analysis. The adsorption properties of hybrid adsorbents were carried out for As(V) and Cr(VI) removal - one relative to the initial pH value, the adsorbent mass, the temperature, and the adsorption time. Time-dependent adsorption study was best described by pseudo-second order equation, while Weber Morris analysis showed that intraparticle diffusion controled diffusional transport. Similar activation energy, 17.44 and 14.49 kJ•mol-1 for adsorption As(V) and Cr(VI) on 3D_W/M, respectively, indicated main contribution of physical adsorption. Determination of adsorption parameters was performed by applying different adsorption isotherm models, and the best fit was obtained using Freundlich model. The adsorption capacity of 24.16 and 29.6 mg g-1 for As(V) and Cr(VI) at 2oC, Co = 5.5 and 5.3 mg L-1, respectively, were obtained. Thermodynamic study indicated favourable process at a higher temperature. Preliminary fixed-bed column study and results fitting with Bohart-Adams, Yoon-Nelson, Thomas, and Modified dose-response model showed good agreement with results from the batch study.

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Published

2022-02-16

Issue

Vol. 54 No. 1 (2022)

Section

Articles