Removal of Mn ions from synthetic wastewater by a nanocollector of graphene oxide in ion flotation

Document Type : Research Article

Authors

Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran

Abstract

Removing heavy metals from wastewater has been one of the main challenges in recent decades, and the ion flotation process has been one of the most effective methods for heavy metals removing. The advantages of ion flotation are its simplicity, requiring less energy, having high recovery and selectivity, and by a low concentration of residual metal in the solution. One drawback of ion flotation is the collector's high consumption. The purpose of this study is to enhance the recovery of manganese ions while minimizing the consumption of collectors. In this study, graphene oxide prepared as a nanocollector was identified by XRD, DLS, FTIR, and SEM analyses. The effective parameters included pH, graphene oxide concentration, air flow rate, impeller speed, and SDS concentration as an auxiliary collector. The results indicated that a pH of approximately 10 is the most effective for removing Mn ions from synthetic wastewater using ion flotation. Other optimal parameters of nanocollector concentration, air flow rate, impeller speed, and SDS concentration are equal to 25 ppm, 800 rpm, 2 L/min, and 43 ppm, respectively. Under these conditions, the recovery of Mn ions from synthetic wastewater and water recovery were 82.6% and 45%, respectively. The results of this study demonstrated that utilizing graphene oxide as a nanocollector in the ion flotation method for wastewater treatment has significant advantages such as high removal recovery, reduction of collector consumption, reusability of graphene oxide.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 28 November 2024

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