In this research, the sanitary ware waste is modified by the addition of sodium hydroxide via the hydrothermal
method. The obtained product was characterized utilizing different techniques such as X-ray diffraction (XRD),
Fourier-transform infrared spectroscopy (FTIR), and Diffuse reflectance spectroscopy (DRS). XRD showed the
synthesized samples before and after calcination containing the two phases Faujasite-NaY and Sodalite. The average
crystallite sizes of S17R and S17C samples were recorded from the x-ray diffraction peaks to be 24.6 and 15.4 nm,
respectively. Also, the optical properties were studied using diffuse reflectance spectroscopy. The band gap and color
analysis of the synthesized products were studied. The values of light and solar reflectance were determined using
JISA5759 2008, and JISK5602 2008 methods. In addition, the prepared products have an efficient adsorption
performance to anionic dyes (sunset yellow, naphthol green B, and amaranth dyes). The maximum adsorption capacities
of S17R and S17C samples toward sunset yellow, naphthol green B, and amaranth dyes are 65.38/39.1/51.66 mg/g and
82.7/46.97/58.33 mg/g, respectively.