title: Modular Polyoxometalate-Layered Double Hydroxide Composites as Efficient Oxidative Catalysts.
abstract: The exploitation of intercalation techniques in the field of two-dimensional layered materials offers unique opportunities for controlling chemical reactions in confined spaces and developing nanocomposites with desired functionality. In this study, the exploitation of the novel and facile "one-pot" anion-exchange method for the functionalization of layered double hydroxides (LDHs) is demonstrated. As a proof-of-concept, we demonstrate the intercalation of a series of polyoxometalate (POM) clusters, Na3[PW12O40]⋅15 H2O (Na3PW12), K6[P2W18O62]⋅14 H2O (K6P2W18), and Na9LaW10O36⋅32 H2O (Na9LaW10) into tris(hydroxymethyl)aminomethane (Tris)-modified layered double hydroxides (LDHs) under ambient conditions without the necessity of degassing CO2. Investigation of the resultant intercalated materials of Tris-LDHs-PW12 (1), Tris-LDH-P2W18 (2), and Tris-LDH-LaW10 (3) for the degradation of methylene blue (MB), rhodamine B (RB) and crystal violet (CV) has been carried out, where Tris-LDH-PW12 reveals the best performance in the presence of H2O2. Additionally, degradation of a mixture of RB, MB and CV by Tris-LDH-PW12 follows the order of CV>MB>RB, which is directly related to the designed accessible area of the interlayer space. Also, the composite can be readily recycled and reused at least ten cycles without measurable decrease of activity.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 (P. R. China).
authors.forename: Yang
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 (P. R. China).
authors.forename: Zhixiao
authors.initials: Z
authors.lastname: Yao
authors.affiliation: WestCHEM, School of Chemistry, University of Glasgow, Glasgow, G12 8QQ (UK). charalampos.moiras@glasgow.ac.uk.
authors.forename: Haralampos N
authors.initials: HN
authors.lastname: Miras
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 (P. R. China). songyufei@hotmail.com, songyf@mail.buct.edu.cn.
authors.forename: Yu-Fei
authors.initials: YF
authors.lastname: Song
keywords: catalysis; degradation; dyes/pigments; layered double hydroxides; polyoxometalate