γ-Alumina powders were produced from the calcination of pseudo-boehmite for scavenging anionic blue (RS 150), and red (RB 133) dyes. The effects of calcination temperature, soaking time, pH, and nanoparticle dosage on dye adsorption were investigated to fabricate a reusable adsorbent. The mentioned dyes can be efficiently adsorbed over the γ-alumina nanoparticles if the calcination conditions, and pH are identified correctly. The powder calcined at 700 oC within 30 min inherently exhibited a high affinity towards blue dye at pH 5.0, while the proper adsorption towards red dye was achieved at pH 2.0. The maximal blue, and red dye adsorption capacities were determined to be 303, and 417mg L-1, respectively. Although the calcination of boehmite at 1,000 oC led to the higher chemical resistance, the specific surface area significantly decreased from 202 to 126m2 g-1, causing a significant drop in the adsorption of blue dye due to an increase in pore diameter, 6 nm. Importantly, the adsorptive performance of produced powder was stable with ten times thermal regeneration. Based on results obtained for the treatment of industrial textile wastewater, the fabricated γ-alumina powder is promising material to adsorb the anionic dyes.