qt = k2qe2t/(1+k2qet) (S2) where and (mg g-1) correspond to the adsorbed amount at time (min) and at the qt qe t equilibrium time, respectively, and the constant [g (mg min)-1] is the pseudo-second order k2 rate coefficient (Gupta and Bhattacharyya, 2011;Simonin et al., 2016). Parameters of the non-linear modeling using the pseudo-first and pseudo-second Table S1 order kinetic for adsorption of As(V) on Mg-Fe LDH. pH 5.5 pH 8.5 (mg g-1) 7.79 7.18 qe(exp) (mg g-1) 7.69 6.69 qe Pseudo-first order (min-1) 0.46 0.25 k1 0.97 0.93 R2 (mg g-1) 8.07 7.22 qe Pseudo-second order [g (mg min)-1] 0.10 0.05 k2 0.99 0.99 R2 Fig. S2. pHPZC of Mg-Fe LDH determined by the immersion technique. Equilibrium adsorption experiments The non-linear form of the Langmuir equation is given by: (S3) qe =qmaxKLce/(1+KLce) where and correspond to the equilibrium concentration in the solution (mg L-1) and the ce qe adsorbed amount at equilibrium (mg g-1), respectively. The parameters and are the qmax KL maximum adsorption capacity (mg g-1) and the Langmuir constant related to the affinity to
qt = k2qe2t/(1+k2qet) (S2) where qt and qe (mg g-1) correspond to the adsorbed amount at time t (min) and at the equilibrium time, respectively, and the constant k2 [g (mg min)-1] is the pseudo-second order rate coefficient (Gupta and Bhattacharyya, 2011;Simonin et al., 2016). Table S1 Parameters of the non-linear modeling using the pseudo-first and pseudo-second order kinetic for adsorption of As(V) on Mg-Fe LDH. pH 5.5 pH 8.5 Pseudo-first order qe(exp) (mg g-1) 7.79 7.18 qe (mg g-1) 7.69 6.69 k1 (min-1) 0.46 0.25 R2 0.97 0.93 Pseudo-second order qe (mg g-1) 8.07 7.22 k2 [g (mg min)-1] 0.10 0.05 R2 0.99 0.99 Fig. S2. pHPZC of Mg-Fe LDH determined by the immersion technique. Equilibrium adsorption experiments The non-linear form of the Langmuir equation is given by: qe =qmaxKLce/(1+KLce) (S3) where ce and qe correspond to the equilibrium concentration in the solution (mg L-1) and the adsorbed amount at equilibrium (mg g-1), respectively. The parameters qmax and KL are the maximum adsorption capacity (mg g-1) and the Langmuir constant related to the affinity to
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