<p> Supporting Information</p><p>Sorption Kinetics In order to investigate the adsorption process of KOH-AC for iodine uptake, the frequently used pseudo first order and pseudo second order models were used. The corresponding equations were given in Equation (1)-(2). Pseudo first order kinetic model:</p><p> ln(qe- q t ) = ln qe - k 1 t (1) Pseudo-second-order model: t1 t = + q k q2 q (2) t 2 e e</p><p>-1 Where qe and qt are the amount of iodine adsorbed at time t and equilibrium (mg g ), -1 k1 is the pseudo-first-order rate constant of adsorption process (h ). k2 is the pseudo- first-order rate constant of adsorption process (g mg-1 h-1).</p><p>6 0.5 (a) (b) 4 0.4</p><p>)</p><p>2 1 - 0.3 ) t g q - m e</p><p> g</p><p> q 0 </p><p>( h</p><p>0.2 ( n</p><p> l t q</p><p>-2 / -1 2 t 300 mg L R =0.8489 0.1 300 mg L-1 R2=0.9961 -4 500 mg L-1 R2=0.7538 500 mg L-1 R2=0.9962 0.0 0 20 40 60 80 100 0 20 40 60 80 100 t ( h ) t ( h ) Fig. S1 The pseudo-first-order (a) and the pseudo-second-order absorption kinetics model (b) KOH-AC for iodine uptake in cyclohexane solution.</p><p>Adsorption isotherm models To describe the experimental data of adsorption isotherms, Langmuir and Freundlich models were employed. The corresponding equations were given in Equation (3)-(6). Langmuir isotherm model:</p><p>Qm k L c e qe = (3) 1+ kL c e</p><p> c c 1 e= e + (4) qe Q m k L Q m Freundlich isotherm model: 1 qe= k c n (5) F e</p><p>1 ln c lnq=e + ln k (6) en F -1 Where ce is the concentration at equilibrium (mg L ), qe is the amount of adsorbed -1 -1 -1 iodine at equilibrium (mg g ). kL (mg ) and Qm (mg g ) are the Langmuir isotherm -1 constants; kF (mg ) and n are the Feundlich isotherm constants. </p><p>12 (a) 6.2 (b) 10 6.1 6.0 8 )</p><p>1 5.9 - L 5.8 g 6 e (</p><p>Q</p><p> n 5.7 e l Q / 4 Freundlich e Langumir 5.6</p><p>C 2 2 5.5 R =0.7845 2 R =0.9968 5.4 0 5.3 0 1000 2000 3000 4000 5000 5.5 6.0 6.5 7.0 7.5 8.0 8.5 Ce (mg L-1) ln Ce Fig. S2 Adsorption isotherm of iodine onto KOH-AC. (a) Langmuir isotherm model, (b) Freundlich isotherm model.</p><p>2</p>