[期刊论文][article]

出版年：2016

Abstract A sol-gel method was used to synthesis La₂Ti₂O₇ photocatalysts using PEG4000 as the template. La₂Ti₂O₇ particle size sharply decreases with the addition of PEG4000. An impurity phase of La_0.66TiO_2.993 is introduced in the perovskite La₂Ti₂O₇ after addition of more than 1.0 g PEG4000. Specific surface areas of the samples are gradually enlarged with increasing amount of PEG4000, accompanied with shrinking average pore size. Both of photocatalytic degradation and adsorption efficiencies of RBR-X3B increase along with the addition of PEG4000. The La₂Ti₂O₇ sample using 1.5 g PEG4000 has the maximum photocatalytic activity, on which nearly 95.3% of the initial RBR-X3B is decolorized after 120 min of irradiation. Only 43.2% of the RBR-X3B is decolorized on the initial La₂Ti₂O₇ after the same time. This is in accordance to the formation of hydroxyl radicals as a factor of the addition of PEG4000.

photocatalytic;La2Ti2O7;sol-gel;PEG4000