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A new mesoporous Zn 1-x M x Al 2 O 4 photocatalyst was prepared using the metal-chitosan complexation method with different degrees of Zn 2+ cation substitution with cobalt and nickel ions (M = Co 2+ and Ni 2+ ). Characterization using X-ray diffraction (XRD), Infrared absorption spectrometry (FTIR), energy dispersion spectroscopy (EDS), diffuse reflectance spectrometry (DRS), scanning electron miscoscopy (SEM), transmission electron miscroscopy (TEM), N 2 adsorption- desorption isotherms using the Barrett-Joyner-Halenda (BJH) method, thermogravimetric analysis (TG) and differential thermal analysis (DTA) confirmed the formation of the spinel phase and high purity for all samples. N 2 adsorption/desorption and size pore distribution confirmed the high surface area. The photocatalytic activity of Zn 1-x M x Al 2 O 4 and the effect of replacing Zn 2+ ions with Ni 2+ and Co 2+ on the degradation of rhodamine B under ultraviolet light were studied in detail. The sample containing 0.1 mol of cobalt had the highest removal rate reaching 83%, favored by surface area and material bandgap (109 m 2 g -  1 and 2.19 eV, respectively).

Synthesis of Mesoporous Zn1−xMxAl2O4 Substituted by Co2+ and Ni2+ Ions and Application in the Photodegradation of Rhodamine B