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Comparative Adsorption of Pb 2+ on Nanostructured Iron–Zirconium Oxide with Fe-to-Zr Molar Ratio of 1:1 and 1:2: Thermodynamic and Kinetic Studies
Arabian Journal for Science and Engineering ( IF 1.711 ) Pub Date : 2020-06-29 , DOI: 10.1007/s13369-020-04715-z
Shah Raj Ali, Abul Kalam, Abdullah G. Al-Sehemi, Zenab Khan, Sadaf Ansari, Naved Haider, Rajesh Kumar

Nanostructured iron–zirconium oxides (NIZOs), with Fe-to-Zr molar ratio of 1:1 and 1:2, have been found to show high adsorption efficiency toward Pb2+ from aqueous solution. The NIZO was synthesized by the co-precipitation method and characterized in terms of XRD, TEM, SEM–EDX, BET surface area analysis, TGA, FT-IR spectroscopy and zeta potential measurement. The data of adsorption of Pb2+ on the NIZO, under optimized condition of pH, Pb2+ concentration, adsorbent amount, time and temperature, were fitted in Langmuir, Freundlich and Temkin adsorption model, and the data showed the best agreement with Langmuir model with R2 = 0.990 and 0.994 for Fe/Zr molar ratio = 1:1 and 1:2, respectively. The thermodynamic studies showed that the adsorption of Pb2+ on the NIZO proceeds spontaneously and exothermically through the involvement of weak van der Waals forces. Further, the adsorption of Pb2+ on the NIZO was found to follow pseudo-second-order kinetics.
更新日期:2020-06-29

 

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