Bi-functional Ni-doped La2O3 nanosheets: their enhanced photocatalytic performance and antibacterial properties
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Abstract
Abstract Contaminated water and antibiotic resistance are global threats that need urgent attention. In this work, we present the sunlight-induced removal of methyl violet (MV) and antibacterial properties of neat La 2 O 3 nanoribbons and Ni (1%, 3%, 5%)-doped La 2 O 3 nanosheets. The increased concentration of Ni dopant not only induces the morphological transformation to quasi-2D-surface-like nanosheets but also greatly improves the optical properties by reducing the bandgap of La 2 O 3 , which synergistically serves to enhance the photocatalytic activity for the degradation of MV. The 5% Ni-doped La 2 O 3 nanosheets exhibit the maximum photocatalytic efficiency, i.e. 99.15% compared to La 2 O 3 (29%) nanoribbons alone, which makes them an exceptional material for the decontamination of MV polluted water. In addition, at the optimized concentration of Ni, La 2 O 3 nanosheets show robust antibacterial activity against P. aeruginosa and S. aureus by inhibiting 83.14% and 84.88% growth, respectively. 5% Ni-doped La 2 O 3 can be a potential bi-functional nanocatalyst and a novel antibacterial material owing to its unique sheet-like morphology that provides high surface interaction with the bacteria and a greater number of adsorption sites for the contaminant dye.
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