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Caption : figure s1. final ph and residual fe (ii) after 3.5 hour of reaction. 

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Caption : figure s2. effect of sodium silicate on the formation of iron particle suspension (a) colour and (b) turbidity in nahco3 buffered synthetic water at 21±1°c. 

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Caption : figure s3. scanning electron microscopy-energy dispersive x-ray spectroscopies (sem-eds) of (a) control system (fe); (b) system in the presence of sodium silicate (60 mg/l) (fe-si); (c) system in the presence of dom (3 mg toc/l) and chlorine (2.5 mg/l) (fe-dom-cl2); and (d) system in the presence of dom (3 mg toc/l), chlorine (2.5 mg/l) and sodium silicate (60 mg/l) (fe-dom-cl2-si).

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Caption : figure s4. x-ray powder diffraction (xrd) of (a) control system (fe); (b) system in the presence of sodium silicate (60 mg/l) (fe-si) and (c) xrd standard curves.

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Caption : figure s5. molecular weight distribution of residual dom at sodium silicate dosages of 0-90 mg/l with (a) goethite and (b) magnetite using high performance size exclusion chromatogphy (sec-hplc).   

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Caption : figure s6. weight-average molecular weight of matter in the presence of 0.3 g/l of goethite or magnetite. data summarized from high performance size exclusion chromatogram results.

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Caption : figure s7. effect of sodium silicate (20 mg/l) on the zeta (ζ-) potential of (a) goethite (0.3 mg/l) and (b) magnetite (0.3 mg/l) at ph 6.5 and 21±1°c in a 0.01m nacl solution.