SDS functionalized magnetic nanoparticle mediated Malachite Green (dye) adsorption 

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... another experiment in this study, SDS modifi ed iron nanoparticle was employed for adsorption of MG as described by Afkhami et al. ( 2010 ). The as- synthesized amorphous nanoparticle which was developed in our laboratory by a novel method was found to be very useful when coated with SDS for removal of this dye. SDS being anionic surfactant will adsorb onto the surface of iron nanoparticle through the negative moiety of sulfate ( Li et al. 2008 ) and makes the surface of the nanoparticle hydrophobic. The dye could be trapped into the aggregates of SDS on iron nanoparticle ( Hiraide et al. 1994 ). The effect of dif- ferent amount of SDS modifi ed nanoparticle on the adsorption of MG was stud- ied to determine the optimum amount for removal of MG in fl ask containing 1-2 μg/mL MG solution mixed with 200 μg/mL SDS coated nanoparticle at pH 3. As Fig. 5 shows, the absorption of MG increased by increasing concentra- tion of MG at constant adsorbent concentration. This result is consistent with report of Afkhami et al. ( 2010 ). The pK a value for MG is 6.9 and in aqueous solution it has two cationic and colourless carbinol forms ( Culp and Beland 1996). The balance between these two forms depends on the pH of the solution; the decrease in the positive charge of adsorbent surface sites can cause a decrease in the adsorption of ...

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... The dye could be trapped into the aggregates of SDS on iron nanoparticle ( Hiraide et al. 1994 ). The effect of dif- ferent amount of SDS modifi ed nanoparticle on the adsorption of MG was stud- ied to determine the optimum amount for removal of MG in fl ask containing 1-2 μg/mL MG solution mixed with 200 μg/mL SDS coated nanoparticle at pH 3. As Fig. 5 shows, the absorption of MG increased by increasing concentra- tion of MG at constant adsorbent concentration. This result is consistent with report of Afkhami et al. ( 2010 ). The pK a value for MG is 6.9 and in aqueous solution it has two cationic and colourless carbinol forms ( Culp and Beland 1996). The balance between these two ...