Application of Nano-Gamma Alumina Adsorbent for Nickel and Cobalt Removal from Mining Industry Wastewater

Subject Areas : Environment Pullotion (water and wastewater)

Fariba  Soleimani ¹ (M.Sc., Student of Environmental Pollution, Science and Research Branch, Islamic Azad University, Tehran, Iran)
Mohammad Hadi  Givianrad ² (Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.(Corresponding author))
Amir Hossein  Haghighaty ³ (Department of Chemistry, Islamic Azad University, Tehran North Branch, Tehran, Iran)

Received: 2017-09-02 Accepted : 2018-03-07 Published : 2020-02-20

Keywords: Nickel and Cobalt, Removal, industry wastewater, nano-Gamma Alumina,

Abstract :

Background and Objective: The development of urbanization and industries has led to an increase in sewage and wastewater production. The defective and non-standard disposal of these wastewaters has resulted in influx of large amounts of heavy metals into the environment which their removal, as bio-irresolvable contaminants, from water and wastewater are considerably important for protecting environment and public health. Method: In this study, gamma Nano-alumina was synthesized and its structural analysis was characterized, which was applied as a high performance adsorbent for heavy metals Nickel and Cobalt. Moreover, by using DX7 software for experiment design, the effects of different conditions such as heavy metals initial concentration, Nano-adsorbent amount and pH were modified.  Findings: The results of XRD, FTIR, SEM and EDX analysis, confirmed the existence of gamma      Nano-alumina structure, and Nickel and Cobalt contents were determined by UV-Vis spectrophotometry method. Nano gamma alumina, as a powerful adsorbent, could be adsorbed the high levels of Nickel and Cobalt in alkaline pH-rich environments, then in experimental samples, 98.66% of Nickel and 95.1% of Cobalt and in real samples, 100% was eliminated.  Discussion and Conclusion: It was found that synthesized gamma Nano-alumina could be considered as a cost-effective and high-performance Nano-absorbent for heavy metals elimination. Consequently, it was verified by Freundlich and Langmuir adsorption isotherms, which the adsorption process of these elements with the Nano-alumina absorbent followed by Freundlich and Langmuir adsorption equation.

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