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<p>This study presents a sustainable hydrometallurgical route for transforming spent nickel-molybdenum catalysts (SNMC) into high-performance nickel oxide (NiO) materials for environmental and energy applications. The leaching kinetics of SNMC were investigated. The leaching experiments confirmed that lactic acid provides superior selectivity, producing phase-pure NiO with hierarchical spherical morphology and large surface area through controlled precipitation and calcination. The lactic acid-derived NiO (NiO-LA) exhibited pure cubic phase (lattice parameter 4.175&#xa0;Å) and optimal band gap (3.35&#xa0;eV), while the hydrochloric acid-derived material contained molybdenum-induced impurity phases such as Ni<sub>2</sub>O<sub>3</sub> and MoO<sub>3</sub> that compromised performance. Response Surface Methodology optimization of photocatalytic activity achieved 95% methylene blue degradation at pH 9.0 within 71.2&#xa0;min. Electrochemical evaluation demonstrated exceptional supercapacitor performance, with a specific capacitance of 470 F/g, and outstanding lithium-ion battery anode capacity of 622 mAh/g. This waste valorization approach exemplifies circular economy principles by converting industrial waste into multifunctional materials that simultaneously address resource recovery, water treatment, and clean energy storage challenges, all of which are essential for sustainable development.</p> Graphical Abstract <p></p>

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The Development of NiO Derived from Spent Ni–Mo Catalyst: Leaching and Performance Evaluation as Photocatalyst and Active Material in Energy Storage

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Cornelius Satria Yudha,
  • Firman Asto Putro,
  • Haryadi,
  • Tifa Paramitha,
  • Khoirunnisa Hamidah,
  • Kristina Dewi Maharini,
  • Meidiana Arinawati,
  • Rizky Nur Hidayat

摘要

This study presents a sustainable hydrometallurgical route for transforming spent nickel-molybdenum catalysts (SNMC) into high-performance nickel oxide (NiO) materials for environmental and energy applications. The leaching kinetics of SNMC were investigated. The leaching experiments confirmed that lactic acid provides superior selectivity, producing phase-pure NiO with hierarchical spherical morphology and large surface area through controlled precipitation and calcination. The lactic acid-derived NiO (NiO-LA) exhibited pure cubic phase (lattice parameter 4.175 Å) and optimal band gap (3.35 eV), while the hydrochloric acid-derived material contained molybdenum-induced impurity phases such as Ni2O3 and MoO3 that compromised performance. Response Surface Methodology optimization of photocatalytic activity achieved 95% methylene blue degradation at pH 9.0 within 71.2 min. Electrochemical evaluation demonstrated exceptional supercapacitor performance, with a specific capacitance of 470 F/g, and outstanding lithium-ion battery anode capacity of 622 mAh/g. This waste valorization approach exemplifies circular economy principles by converting industrial waste into multifunctional materials that simultaneously address resource recovery, water treatment, and clean energy storage challenges, all of which are essential for sustainable development.

Graphical Abstract