Adsorption of Acid Blue 92 Dye on Modified Diatomite by Nickel Oxide Nanoparticles in Aqueous Solutions

Application of diatomite for the treatment of dye-bearing effluents has high significance in environmental research. in this research, adsorption of acid blue 92 (ab 92) from aqueous solutions on raw and nickel oxide nanoparticles-modified diatomite (nonmd) was studied. the effect of different operation parameters on adsorption process was evaluated. the surface morphology of adsorbents was characterized by sem, bet, ftir, xrd, edx and elemental analysis. the maximum removal percentage of ab 92 using 0.1 g of modified diatomite at ph 2, 25±1°c, agitation speed of 200 rpm, initial dye concentration of 50 mg/l after 90 min was 95.21% (47.61 mg/g). furthermore, under same conditions, the maximum adsorption of dye on raw diatomite was 56.95% (28.48 mg/g). the experimental data showed that the adsorption of dye on raw diatomite follows the langmuir model, but its adsorption on modified diatomite follows the bet model. the kinetics effect of the adsorbent was pseudo-second-order. prog. color colorants coat. 5(2012), 101-116. © institute for color science and technology.