Photocatalytic Activities of Layered Niobate Perovskite (A'An^|^minus;1NbnO3n+1, A: Ca, La) with Substitution of Ti and W for Nb

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Abstract
A novel series of Dion-Jacobson type layered perovskite RbLaNb2−2xTixWxO7 (x=0, 0.1, and 0.2) and KCa2Nb3−2xTixWxO10 (x=0, 0.15, and 0.3) have been synthesized. The XRD patterns confirm that the optimum conditions for synthesis of RbLaNb2−2xTixWxO7 and KCa2Nb3−2xTixWxO10 are 1000 and 1100 degree for 6 h, respectively. The estimated optical band gap energies of RbLaNb2O7, RbLaNb1.8Ti0.1W0.1O7 and RbLaNb1.6Ti0.2 W0.2O7 are 3.21, 3.18 and 3.11, respectively. The influence of the partial substitution of Ti and W on the photo-catalytic activity of pure RbLaNb2O7 was evaluated by using the degradation of phenol for 4 hours. At the end of experiment, the normalized concentration of phenol is 0.9, 0.8, 0.5 by RbLaNb2O7, RbLaNb1.8Ti0.1W0.1O7 and RbLaNb1.6Ti0.2W0.2O7 respectively, which indicates that the substitution of Ti and W for Nb in RbLaNb2O7 layered perovskites could increase the photocatalytic efficiency. The photocatalytic activities of KCa2Nb3−2xTixWxO10 were also tested and the result has been shown that the phenol degradation by RbLaNb2−2xTixWxO7 is better than KCa2 Nb3−2xTixWxO10.

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