Adsorption behavior of Co(II) and Ni(II) from aqueous solutions onto titanate nanotubes |
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| Authors: | S. E. A. Sharaf El-Deen Nabila S. Ammar |
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| Affiliation: | 1. Department of Nuclear Chemistry, Hot Laboratories Center, Atomic Energy Authority, Inshas, Egypt;2. National Research Centre, Water Pollution Control Department, El Buhouth Street, Dokki, Cairo, Egypt |
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| Abstract: | Adsorption of Co2+ and Ni2+ from aqueous solutions onto titanate nanotubes (TNTs) synthesized by hydrothermal method in single and binary systems was investigated. The prepared TNTs were completely characterized showing very high surface area compared to previous studies (320 m2/g). The high surface area showed very good optimum removal conditions compared with previous studies (60 min contact time, 0.1 g TNTs dose at pH 5 and room temperature) with high adsorption capacity compared with previous studies as well as conventional adsorbent. Langmuir and Freundlich isothermal models were fitted during this study and Dubinin–Kaganer–Radushkevich isotherms showed physisorption with exclusion of ion exchange mechanism. Pseudo first and second-order kinetics were studied showing more fitting to pseudo second-order equation. Binary system and calculation of separation coefficient showed high ability for Co2+ adsorption by TNTs than Ni+2 in binary system. |
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| Keywords: | titanate nanotubes adsorption heavy metals binary systems isothermal models |
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