Microwave hydrothermal synthesized ZnIn-layered double hydroxides derived ZnIn-layered double oxides for enhanced methylene blue photodegradation

摘要

The ZnIn-layered double hydroxides (ZnIn-LDHs) were synthesized by microwave hydrothermal method and used as the precursors to prepare the ZnIn-layered double oxides (ZnIn-LDOs) by the controllable calcination. The ZnIn-LDOs were aggregated by porous sheet materials, and the particle size was about 50 nm. The photocatalytic studies showed that the optimum molar ratio of Zn2+/In3+ was 3:1 and the optimum calcination temperature was 600 degrees C. The photocatalytic degradation of MB by the as-prepared ZnIn-LDOs photocatalysts reached an efficiency of 98 % after irradiation under the simulated sunlight for 120 min. Radial trapping experimental results indicated that the main reactive specie for MB removal in the degradation processes was h(+).