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Adsorptive removal of Cd2+ from aqueous solution by a highly stable covalent triazine-based framework

Abstract

: Porous crystalline materials, covalent organic frameworks (COFs) have gained tremendous popularity in multidisciplinary areas of science and technology. In this paper, for the first time we report covalent triazine-based framework (CTF-1), as efficient adsorbent for the removal of Cd2+ from aqueous solutions. The CTF-1 offering excellent stability under extreme conditions, for the effective removal of cadmium cations (Cd2+) from aqueous solutions. CTF-1 was first synthesized through ionothermal method and then characterized by XRD, SEM, TEM and BET surface area measurements to confirm it’s highly crystalline and microporous nature. Batch adsorption experiments were systematically conducted under a wide range of pH, metal ions concentration, adsorbent dosage and contact time to investigate kinetics, thermodynamics and adsorption properties of CTF-1 towards Cd2+ ions. The pseudo-second order model showed good fitting to experimental data, whereas, Langmuir and D-R isotherms confirmed the chemical nature of the adsorption. Similarly, thermodynamics parameters showed the adsorption to be spontaneous and endothermic. Furthermore, our simulation results showed that the CTF-1 possess uniform distribution of negative charge along the framework, making it an ideal candidate for the adsorption of cations together with the high stability in both acidic and basic pH. The strategies adopted in this work will open new avenue to design novel nanoporous functional materials for next generation adsorbents. Key Words: COFs, adsorption, thermodynamics, kinetics, cadmium, crystalline.

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Publication details

The article was received on 12 Apr 2018, accepted on 04 May 2018 and first published on 09 May 2018


Article type: Paper
DOI: 10.1039/C8NJ01778F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Adsorptive removal of Cd2+ from aqueous solution by a highly stable covalent triazine-based framework

    Z. A. Ghazi, A. M. Khattak, I. Rashid, R. Ahmad, A. A. Khan, M. Usman, F. Nawaz, W. Ali, S. U. Jan, Z. Felegari, A. Iqbal and A. Ahmad, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01778F

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