Upcycling hazardous waste into high-performance Ni/η-Al₂O₃ catalysts for CO₂ methanation.

ABSTRACT: Transforming hazardous and difficult-to-process waste materials, like spent Ni-MH batteries and aluminium foil, into nanocatalysts (NCts) provides a sustainable solution for resource management and reducing environmental impact. This study demonstrates a novel approach by extracting nickel sulfate (NiSO₄·xH₂O) from battery waste and subsequently converting it into Ni(OH)₂ hydrogel precursors using l-glutamic acid. Waste aluminium foil was processed into alumina (Al₂O₃), and combined with Ni(OH)₂ to synthesize Ni/η-Al₂O₃ NCts with 4% and 8% Ni loading. Characterization through XRD/SAED, STEM/EFTEM, and EELS revealed a disordered cubic structure of η-Al₂O₃, with well-dispersed

SUBMITTER: Maqbool Q 

PROVIDER: S-EPMC11826383 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature