# Fig xA Zeta potential variation of synthesized Py Fe O

Both the linearized forms of Langmuir and Freundlich equations are given by the following equations, respectively:equation(3)Ce/qe=1/KLqmax+1/qmaxCeequation(4)Logqe=LogKF+(1/n)LogCewhere Ce is zygote the equilibrium dye concentration into the sample solution (mg L−1), qe is the amount of dye absorbed per gram of adsorbent (mg g−1) at Ce, qmax is the maximum sorption capacity (mg g−1) which depends on the number of adsorption site.