Abstract
The significance of toxic metals pollution treatment has become incrementally manifested as an important environmental issues in the recent years due to the urgent need to access healthy water and increase of the anthropogenic activities in water contamination. For efficient treatment of water contaminants, the selective and novel materials are always welcomed. In this study, the hydrothermally synthesized titanate nanotubes (TNT) were modified by the mercaptosilane modifier for the removal of Cu(II) and Ni(II) toxic contaminants. The modified TNT adsorbent (TNT/Sil) was characterized in terms of the physicochemical aspects and then, the experiments for capturing metal cations were performed in batch mode. The modified adsorbent presented more affinity for the removal of Cu(II) than Ni(II).Theresults demonstrated thatthe experimental data were highly fitted to the Freundlich isotherm model and the maximum uptake capacities for Cu(II) and Ni(II) were found to be 53.77 and 45.29 mg g-1, respectively. In addition, endothermic nature of the adsorption process was predicted by the thermodynamic study as well as the pseudo-second order model that was corresponded to the kinetic data. Considering these achievements and due to the surface hydroxyl and thiol functional groups, TNT/Sil adsorbent could be effective and promising material in the purification of wastewaters, contaminated with toxic metal cations.
Highlights
The significance of toxic metals pollution treatment has become incrementally manifested as an important environmentalissues intherecent years dueto theurgent need to access healthy water and increase of the anthropogenic activities in water contamination
Synthesis of titanate nanotubes TNTs were prepared using the alkaline hydrothermal method according to the procedure of Kasuga et al [20]
As thiol group’s peak was naturally weak, this peak was not observed in TNT/Sil NPs spectra but the existence of Si O-Ti and CH2 groups confirmed the successful modification of the TNT sample [25, 26]
Summary
The significance of toxic metals pollution treatment has become incrementally manifested as an important environmentalissues intherecent years dueto theurgent need to access healthy water and increase of the anthropogenic activities in water contamination. Endothermic nature of the adsorption process was predicted by the thermodynamic study as well as the pseudo-second order model that was corresponded to the kinetic data Considering these achievements and due to the surface hydroxyl and thiol functional groups, TNT/Sil adsorbent could be effective and promising material in the purification of wastewaters, contaminated with toxic metal cations. As reported by World Health Organizatio n (WHO), the allowable limit for Cu(II) and Ni(II) contaminants in the potable water is 1.5 mg/L and less than 0.1 mg/L and in the industrial effluents is 0.05-1.5 mg/L and 2 mg/L, respectively [6] In this matter, the removal and recovery of toxic metal ions from industrial effluents is essential; various conventional and modern methods, including adsorption, precipitation, coagulation-flocculation, ion exchange, membran e filtration, electrochemical, etc. There is a crucial need to search more costeffective and efficient techniques to deal with the heavy metals health hazards
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