OICC Press Iranian Journal of Catalysis 2345-4865 7 4 2024 02 03 P-type semiconducting NiO nanoparticles synthesis and its photocatalytic activity EN Alireza Heidarineko Department of Chemistry, Center Tehran Branch, Islamic Azad University, Tehran, Iran. Azar Bagheri Ghomi Department of Chemistry, Center Tehran Branch, Islamic Azad University, Tehran, Iran. Journal Article 2024 02 03 Nickel oxide (NiO) nano-size powder is synthesized using nickel (II) acetate tetrahydrate, sodium lauryl sulfate (SLS) and ammonia as precursors. Applied surfactant is anionic surfactant. The sample was characterized by FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM). The results obtained confirm the presence of nickel oxide nano-powders produced during chemical precipitation. Evaluation of the catalytic activity of developed nano-NiO particles were carried out using ultraviolet visible spectra. The uv-vis spectra obtained after ultraviolet irradiation in the presence of nickel oxide can indicate the degradation of tetracycline (TC) and dye Acid red -18 (ponceau 4R). The prepared NiO exhibits that 75% of Acid red -18 has been eliminated after 10 min.The results indicate that optimum concentration of NiO catalyst and the best pH for the degradation of AR were 0.5 g L-1 and pH 7, respectively. The best TC degradation results were obtained with 2 g L−1of the photocatalyst at pH 11.