Thomas rate constant, kt 0.0013 0.00071 0.0011 0.00015 Maximum sorption capacity (mg g-1) 13.1 20.8 12.9 18.1 R2 0.963 0.799 0.931 0.716 Table S4. Kinetic data of the adsorption of As(III) and As(V) onto CMDSPU As(III) As(V) First order Second order order Second order Adsorbent pH References (min-1) (g (min-1) (g 4.6 0.002 1.9×10-2 0.582 0.582 Ferrihydrite [] 9.2 0.000 1.8×10-2 0.888 0.415 Magnetic 7 - 5.8×10-2 - 1.6×10-2 [] oxide Goethite 6.5 4×10-4 1.8×10-4 Hematite 7.3 - 1.1×10-3 - 1×10-3 [] Magnetite 7.5 7.4×10-4 4.2×10-4 Treated 7.4 0.06 0.29 0.03 0.08 [] laterite CMDS 6.9 - - 4.84×10-3 5.35×10-4 [] 3 3.0×10-2 8.83×10-2 5 4.2×10-2 8.47×10-2 PUCMDS 7 - 4.0×10-2 - 0.41×10-2 This study 9 7.6×10-2 1.1×10-2 11 3.7×10-2 0.63×10-2 Table S5. Arsenic and heavy metal recovered from the column studies after regeneration and backwashing (Q: 29.17 mL min-1, 1% NaOH solution) Column Total Heavy Heavy Heavy Adsorbent species regeneration heavy metal metal metal cycles metal removed recovered recovery
Thomas rate constant, kt 0.0013 0.00071 0.0011 0.00015 Maximum sorption capacity (mg g-1) 13.1 20.8 12.9 18.1 R2 0.963 0.799 0.931 0.716 Table S4. Kinetic data of the adsorption of As(III) and As(V) onto CMDSPU Adsorbent pH As(III) As(V) References First order (min-1) Second order (g order (min-1) Second order (g Ferrihydrite 4.6 9.2 0.002 0.000 1.9×10-2 1.8×10-2 0.582 0.888 0.582 0.415 [] Magnetic oxide 7 - 5.8×10-2 - 1.6×10-2 [] Goethite Hematite Magnetite 6.5 7.3 7.5 - 4×10-4 1.1×10-3 7.4×10-4 - 1.8×10-4 1×10-3 4.2×10-4 [] Treated laterite 7.4 0.06 0.29 0.03 0.08 [] CMDS 6.9 - - 4.84×10-3 5.35×10-4 [] PUCMDS 3 5 7 9 11 - 3.0×10-2 4.2×10-2 4.0×10-2 7.6×10-2 3.7×10-2 - 8.83×10-2 8.47×10-2 0.41×10-2 1.1×10-2 0.63×10-2 This study Table S5. Arsenic and heavy metal recovered from the column studies after regeneration and backwashing (Q: 29.17 mL min-1, 1% NaOH solution) Adsorbent species Column regeneration cycles Total heavy metal Heavy metal removed Heavy metal recovered Heavy metal recovery
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