Abstract
Tungstophosphate (PW<sub>12</sub>O<sub>40</sub><sup>3-</sup>) intercalated ZnAl-Layered double hydroxide (ZnAl-PW<sub>12</sub>) was successfully synthesized through the rehydration of calcined LDH. Chemical analyses and characterizations by powder XRD, FT-IR, and Diffuse reflectance UV-Vis spectra confirmed the intercalation of PW<sub>12</sub>O<sub>40</sub><sup>3-</sup> ions equivalent to ~80% of the residual positive charge in the brucite layer. The efficiency of ZnAl-PW<sub>12</sub> for decolourisation of four structurally different cationic/anionic dyes through simultaneous adsorption and photocatalysis under visible light irradiation was assessed. Under identical conditions, the photocatalytic efficiency of the ZnAl-PW<sub>12</sub> catalyst was found to be much higher than that of calcined ZnAl-LDH, indicating the promoting effect of PW<sub>12</sub>O<sub>40</sub><sup>3-</sup> ion. Moreover, the loss of costly polyoxometallate (POM) could be avoided by intercalating the POM ion in the interlayer of LDH, which can facilitate the use of synthesized catalysts for repeated cycles.
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