Inorganic Nanosheets and Nanosheet-Based Materials by Teruyuki Nakato Jun Kawamata & Shinsuke Takagi

Author:Teruyuki Nakato, Jun Kawamata & Shinsuke Takagi
Language: eng
Format: epub
Publisher: Springer Japan, Tokyo

To investigate the effects of the nano-structure on the photoinduced intercalation behavior, layered silicates with different layer charge density (Kunipia F, Sumecton SA and TSM) have been used [155]. While intercalation and photoinduced intercalation of phenol into AZ(OH)+-TSM and AZ(OH)+-Kunipia F were observed, those phenomena were not seen for AZ(OH)+-Sumecton SA. The structure of the AZ(OH)+-clays before the intercalation is different; an interdigitated monolayer of AZ(OH)+ with the longer molecular axis inclined to the silicate layer in Kunipia and TSM, and a monolayer coverage of AZ(OH)+ with their molecular long axis parallel to the silicate layer in Sumecton SA. The dye orientation correlates the intercalation and photoinduced intercalation of phenol.

Another cationic azo dye, AZ(CH3)+, in which hydroxyl group is absent (Fig. 9.17b), was synthesized to compare the adsorptive properties of AZ(OH)+-Kunipia F [156] (Fig. 9.19). Although the gallery height of AZ(CH3)+-Kunipia F also changed by the phenol intercalation as also seen in the AZ(OH)+-Kunipia F system, the amount of the intercalated phenol into AZ(CH3)+-Kunipia F was relatively large compared with that in AZ(OH)+-Kunipia F. Due to the absence of the hydroxyl group, the hydrophobic nature enhanced to lead larger amount of the intercalated phenol before irradiation. On the contrary, the amount of the intercalated phenol after the UV irradiation for AZ(CH3)+-Kunipia F was relatively small. No intercalation at ground state, larger amount of intercalation by irradiation, complete deintercalation by subsequent irradiation and smooth response will be required to find practical application of these phenomena as advanced smart adsorbents.

Fig. 9.19The change in the gallery heights of AZ(CH3)+- and AZ(OH)+-Kunipia F; a before the intercalation of phenol, b after phenol intercalation, c after UV irradiation and d after subsequent visible light irradiation. Reprinted from Ref. [156]. Copyright 2008 Elsevier

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