Adsorptive removal of nickel(II) ions from aqueous environment: A review

• Assembled the scattered available adsorbents prepared and used for Ni(II) ions removal.
• Systematic arrangement of adsorbents in specific class or group.
• Compared each adsorbent's maximum adsorption capacity for Ni(II) ions.
• Analyzed different optimal parameters specified for different adsorbents towards Ni(II) ions.
• Isotherm, kinetic and thermodynamic results were also mentioned.

Among various methods adsorption can be efficiently employed for the treatment of heavy metal ions contaminated wastewater. In this context the authors reviewed variety of adsorbents used by various researchers for the removal of nickel(II) ions from aqueous environment. One of the objectives of this review article is to assemble the scattered available enlightenment on a wide range of potentially effective adsorbents for nickel(II) ions removal. This work critically assessed existing knowledge and research on the uptake of nickel by various adsorbents such as activated carbon, non-conventional low-cost materials, nanomaterials, composites and nanocomposites. The system's performance is evaluated with respect to the overall metal removal and the adsorption capacity. In addition, the equilibrium adsorption isotherms, kinetics and thermodynamics data as well as various optimal experimental conditions (solution pH, equilibrium contact time and dosage of adsorbent) of different adsorbents towards Ni(II) ions were also analyzed. It is evident from a literature survey of more than 190 published articles that agricultural solid waste materials, natural materials and biosorbents have demonstrated outstanding adsorption capabilities for Ni(II) ions.

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