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<p>Heavy metal contamination by manganese and cadmium ions from industrial sources poses a significant environmental threat. This study introduces a highly efficient method for their simultaneous removal from wastewater employing graphene oxide (GO) as a novel nanocollector in the ion flotation process. The research optimized key operational parameters, identifying optimal conditions as pH=10, GO = 25 ppm, and Hexadecyltrimethylammonium Bromide (HTAB) = 25 ppm. Under these conditions, the process achieved superior removal efficiencies: 91.83% for Mn and 90.64% for Cd, with an acceptable water recovery of 28%. The mechanism investigation revealed that the high removal efficiency at pH=10 is driven by the deprotonation of GO’s surface functional groups, resulting in a strong electrostatic attraction and surface complexation with the dominant positive metal species ([Mn<sub>2</sub>(OH)<sub>3</sub>]<sup>+</sup>, Cd<sup>2+</sup>, and [Cd (OH)]<sup>+</sup>). Characterization via FTIR confirmed the formation of metal-oxygen (Mn-O, Cd-O) bonds, and SEM-WDX verified the successful co-adsorption of both metals’ ions onto the GO sheets. This GO-assisted ion flotation technique provides an eco-friendly and cost-effective strategy for effectively mitigating manganese and cadmium pollution, demonstrating significant potential for industrial wastewater treatment applications.</p>

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Simultaneous removal of manganese and cadmium ions by graphene oxide nanocollector: Optimization and mechanism study of ion flotation

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Sobouti Arash,
  • Cherlo Afshin Rokhsari,
  • Hoseinian Fatemeh Sadat,
  • Rezai Bahram

摘要

Heavy metal contamination by manganese and cadmium ions from industrial sources poses a significant environmental threat. This study introduces a highly efficient method for their simultaneous removal from wastewater employing graphene oxide (GO) as a novel nanocollector in the ion flotation process. The research optimized key operational parameters, identifying optimal conditions as pH=10, GO = 25 ppm, and Hexadecyltrimethylammonium Bromide (HTAB) = 25 ppm. Under these conditions, the process achieved superior removal efficiencies: 91.83% for Mn and 90.64% for Cd, with an acceptable water recovery of 28%. The mechanism investigation revealed that the high removal efficiency at pH=10 is driven by the deprotonation of GO’s surface functional groups, resulting in a strong electrostatic attraction and surface complexation with the dominant positive metal species ([Mn2(OH)3]+, Cd2+, and [Cd (OH)]+). Characterization via FTIR confirmed the formation of metal-oxygen (Mn-O, Cd-O) bonds, and SEM-WDX verified the successful co-adsorption of both metals’ ions onto the GO sheets. This GO-assisted ion flotation technique provides an eco-friendly and cost-effective strategy for effectively mitigating manganese and cadmium pollution, demonstrating significant potential for industrial wastewater treatment applications.