amine functionalized kit-6 mesoporous magnetite nanocomposite as an efficient adsorbent for removal of ponceau 4r dye from aqueous solutions

in this study, amine functionalized kit-6 silica mesoporous magnetite nanocomposite (nh2-mmnc) was synthesized by chemical methods and used as an efficient and recoverable adsorbent for removal of ponceau 4r, as a toxic dye, from aqueous solutions. the synthesized nanocomposites were characterized by xrd, ft-ir, bet and sem instruments. the effect of various experimental parameters on the dye removal efficiency was studied using taguchi orthogonal array design (l9 array) method and under optimum conditions (ph = 2, adsorbent amount = 80 mg, stirring time = 30 min and without addition of salt) removal efficiency higher than 98% was obtained.the kinetic studies showed rapid sorption dynamics by a second-order kinetic model with r2=0.9993 and qeq= 58.8 mg g-1, suggesting chemisorption mechanism. dye adsorption equilibrium data were fitted well to the langmuir isotherm and the synthesized sorbent showed complete removal efficiency. the maximum monolayer capacity of the sorbent (qmax , mg g-1), and the langmuir binding constant which is related to the energy of adsorption (kl, l mg-1), were obtained as 87.7 and 0.407, respectively. the results of real samples show that the synthesized nanocomposite can be used as a recyclable and efficient adsorbent for removal of ponceau 4r anionic dye from aqueous solutions.