application of response surface methodology for the obtaining optimization removal of crystal violet from aqua sulotion

before discharging wastewaters to aquatic ecosystems, it is necessary to reduce dye concentration in the wastewater. Ultraviolet-Visible (UV-Vis) spectrophotometric techniques have received increasing attention in the area of simultaneous determination of dyes, especially during the last decade [1]. Silicate was prepared by extraction from straw. Also, synthesis of SBA-15 mesoporous silica nanoparticles was performed and characterized by means of X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and N2 adsorption–desorption [2]. The BET surface area and average pore diameter of synthesized SBA-15 were obtained to be 602 m2 g-1 and 4.5 nm, respectively. SBA-15 mesoporous silica nanoparticles used as adsorbent for the removal of crystal violet (CV) cationic dye from aqueous solution. Four factors including the pH, adsorbent dosage, initial dye concentration and ageing time have been optimized by response surface modeling (RSM) using design expert software (version 8.0.7.1) for removal of crystal violet by SBA-15 nanoparticles. Results indicated that longer contact times (14 min), higher initial concentrations (28 mg L-1), lower adsorbent dosages (0.1 g L-1) and basic pH (9) results in the best adsorption capacity of SBA-15 with response surface methodology. The combined effect of factors on the adsorption uptake of SBA-15 nanoparticles is shown as contour plot and response surface plots. Finally, the maximum adsorption capacities of 166 mg g-1 at optimum experimental conditions was obtained for crystal violet. The SBA-15 nanoparticles have the potential to be applied in real industrial wastewaters for the removal of cationic dyes such as crystal violet.