02408naa a2200265 a 450000100080000000500110000800800410001902200140006002400590007410000190013324501020015226000090025430000110026352016300027465300160190465300180192065300190193865300290195770000160198670000200200270000240202270000170204670000190206377300600208221469572024-12-10       2022    bl uuuu     u00u1 u    #d  a0254-05847 ahttps://doi.org/10.1016/j.matchemphys.2022.1265912DOI1 aGALVANI, G. M.  aTwo-dimensional NiO nanosheets for efficient Congo red adsorption removal.h[electronic resource]  c2022  a1 - 11  aStrategies for developing new adsorbents are necessary for more efficient processes to remove contaminants fromwastewater. Thus, it is essential to adjust the synthesis parameters of the adsorbent nanomaterial to control thesurface area and morphology and, therefore, enhance the adsorption performance. Herein, α-Ni(OH)2 nanosheets were synthe sized via a simple and fast microwave-assisted solvothermal method and converted to NiO nanostructures by calcination in air. The effect of different calcination temperatures (range of 300–600 ◦C) on themorphology, crystal structure, and adsorption performance of Congo red (CR) was evaluated. The calcination ofα-Ni(OH)2 at 300 ◦C resulted in 2D NiO nanosheets, which showed the best performance to remove CR dye due tothe increased surface area and porosity provided by the 2D morphology. The nanosheet-like structure is lost withincreasing the calcination temperature and the nanoparticles become bigger, consequently, the CR adsorptioncapacities are significantly reduced. The 2D NiO nanosheets can adsorb a significant amount of CR quickly,reaching equilibrium after only 120 min, indicating a high affinity between the adsorbate species and the surfaceof the adsorbent. Additionally, the adsorption isotherm was compatible with the Langmuir model, which provides a maximum calculated adsorption capacity of 259.74 mg g− 1. Thus, our findings showed how to adequatethe synthesis parameters to obtain NiO nanosheets and improve the adsorption parameters to CR, which can beextended to the fabrication of new materials to promote advances in sustainable technologies.  aAnionic dye  aColor removal  aNanoadsorbents  aTwo-dimensional material1 aZITO, C. A.1 aPERFECTO, T. M.1 aMALAFATTI, J. O. D.1 aPARIS, E. C.1 aVOLANTI, D. P.  tMaterials Chemistry and Physicsgv. 290, e126591, 2022.