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. 2017 Apr 19;9(18):15566–15576. doi: 10.1021/acsami.7b04181

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Copyright © 2017 American Chemical Society

This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

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Reusability of OSNP for dye adsorption. (A) The OSNP can be reused for phenol red adsorption (t = 5 min, pH = 2 treatment, RT, 0.25 mg/mL or 0.66 mM phenol red, 2 mg of OSNP). Error bars represent the standard deviation for 3 measurements. (B) The OSNP changed from white to pink after addition to phenol red solutions and centrifugation due to adsorption (Ads.), but they became white again after base treatment due to dye desorption (Des.). (C) Change of zeta potential after dye adsorption and recovery of zeta potential after dye desorption. NPs represent the original OSNP; A1, A2, and A3 represent NPs after adsorption in cycles 1, 2, and 3; D1, D2, and D3 represent NPs after desorption in cycle 1, 2, and 3. (D) The accumulative loss of loss in the first 10 cycles. (E) The color of supernatant after desorption was more intense than after adsorption indicating a high adsorption and desorption efficiency.