Intercalation of conjugated polyelectrolytes in layered titanate nanosheets for enhancement in photocatalytic activity

• Published in: Journal of solid state chemistry 2019-01, Vol.269, p.291-296
• Main Authors: Hong, Seong Won, Kim, Aran, Choi, Joon Hyun, Jung, Hyun, Park, Jin Kuen
• Format: Article
• Language: English
• Subjects: Conjugated polyelectrolytes; Face-on structure; Layered titanate; Photocatalysis; Tetrabutylammonium
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2018.09.038

Cationic π-conjugated polyelectrolytes (CPEs) were successfully intercalated into layered titanate (TiO2), while exfoliated layered titanates were reassembled into lamellar structures. The resulting composites showed significantly enhanced visible light absorbance and enhanced photocatalytic activity with respect to layered titanate, which was proven by the photodegradation of methylene blue in aqueous media under irradiation by visible light. Notably, some amount of tetrabutylammonium (TBA) used for the delamination of a layered titanate could be co-intercalated with CPEs, and the residual TBA could be removed via continuously repeating the intercalation process, maintaining the spatial arrangement and content of CPEs in the confined area of layered titanates. However, with the presence of TBA, the hybrid demonstrated greater performance in the photodegradation of methylene blue at any given period of time and almost complete degradation of such dye within 8 min. The significant difference in photocatalytic efficiency with or without TBA suggested that the TBA effectively reduced the surface energy at the interface between the organic components and aqueous medium, which was evidenced by the dispersity assessment of hybrids with or without TBA. Cationic π-conjugated polyelectrolytes (CPEs) were successfully intercalated into layered titanate (TiO2). The resulting composites showed significantly enhanced photocatalytic activity which was proven by the photodegradation of methylene blue in aqueous media under irradiation by visible light. Notably, with the presence of TBA, the hybrid demonstrated greater performance in the photodegradation of methylene blue at any given period of time and almost complete degradation of such dye within 8 min. [Display omitted]