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<p>Metallic cobalt is highly valued for its exceptional thermal and corrosion resistance, making it crucial for high-performance applications. Sodium lauryl sulfate (SLS) plays a vital role in cobalt electrowinning, improving deposit quality by acting as a surfactant on hydrogen bubbles. However, studies on its degradation in the electrowinning process are scarce. This paper on SLS degradation, using UV–Vis spectroscopy, thermogravimetry, and voltammetry, has provided valuable insights. The addition of 0.05&#xa0;g L⁻<sup>1</sup> of SLS to a cobalt sulfate solution at 200 A m⁻<sup>2</sup>, 60&#xa0;°C, and pH 4 increased current efficiency from 92.5% to 99.15% and significantly improved the cobalt deposit appearance. UV–Vis results showed a steady decline in SLS concentration over 6&#xa0;h of electrolysis, due to its partial adsorption on cobalt deposit and oxidation at the anode. Thermogravimetric and voltammetric analyses confirmed the presence of the additive in the cobalt deposit, highlighting the need to regulate SLS concentration to maintain high current efficiency and deposit quality during prolonged electrodeposition.</p> Graphical abstract <p></p> <p>The sodium lauryl sulfate facilitates the release of hydrogen bubbles due to its surfactant properties. However, its structure may degrade due to the constant current density applied, through oxidation processes at the anode or even the adsorption of the additive onto the metallic deposit. This can affect both the physical and chemical properties of the deposits as well as the efficiency of the cobalt electrowinning process.</p>

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Degradation of sodium lauryl sulfate and its effect during cobalt electrowinning

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • Danielle Costal de Castro,
  • Iranildes Daniel dos Santos,
  • Pedro Paulo Medeiros Ribeiro,
  • Achilles Junqueira Bourdot Dutra

摘要

Metallic cobalt is highly valued for its exceptional thermal and corrosion resistance, making it crucial for high-performance applications. Sodium lauryl sulfate (SLS) plays a vital role in cobalt electrowinning, improving deposit quality by acting as a surfactant on hydrogen bubbles. However, studies on its degradation in the electrowinning process are scarce. This paper on SLS degradation, using UV–Vis spectroscopy, thermogravimetry, and voltammetry, has provided valuable insights. The addition of 0.05 g L⁻1 of SLS to a cobalt sulfate solution at 200 A m⁻2, 60 °C, and pH 4 increased current efficiency from 92.5% to 99.15% and significantly improved the cobalt deposit appearance. UV–Vis results showed a steady decline in SLS concentration over 6 h of electrolysis, due to its partial adsorption on cobalt deposit and oxidation at the anode. Thermogravimetric and voltammetric analyses confirmed the presence of the additive in the cobalt deposit, highlighting the need to regulate SLS concentration to maintain high current efficiency and deposit quality during prolonged electrodeposition.

Graphical abstract

The sodium lauryl sulfate facilitates the release of hydrogen bubbles due to its surfactant properties. However, its structure may degrade due to the constant current density applied, through oxidation processes at the anode or even the adsorption of the additive onto the metallic deposit. This can affect both the physical and chemical properties of the deposits as well as the efficiency of the cobalt electrowinning process.