| Summary: | A new photocatalyst In<sub>2</sub>CdO<sub>4</sub> was prepared by a solid phase sintering synthesis method at high temperature for the first time in this paper. The In<sub>2</sub>CdO<sub>4</sub>/Y<sub>2</sub>SmSbO<sub>7</sub> heterojunction (IYH) catalyst was prepared by the solvent thermal method for the first time. The Y<sub>2</sub>SmSbO<sub>7</sub> compound crystallized in the pyrochlore-type architecture and cubelike crystal system, and the space group of Y<sub>2</sub>SmSbO<sub>7</sub> was <i>Fd3m</i> and the crystal cell parameters of Y<sub>2</sub>SmSbO<sub>7</sub> was 9.51349 Å. The band gap width of Y<sub>2</sub>SmSbO<sub>7</sub> was 2.63 eV. In<sub>2</sub>CdO<sub>4</sub> crystallized with a body centered tetragonal lattice structure which was a tetragonal crystal system with a space group of <i>I41/amd</i>. The band gap width of In<sub>2</sub>CdO<sub>4</sub> was 2.70 eV. After 110 minutes of visible light irradiation (VLGI-110min) with IYH as the photocatalyst, the removal rate (RR) of rhodamine B (RhB) concentration was 100% and the total organic carbon (TOC) concentration RR was 99.71%. The power mechanics invariable k toward RhB consistency and visible light irradiation (VLGI) time with IYH as the photocatalyzer reached 0.03073 min<sup>−1</sup>. The power mechanics invariable k which was involved with TOC reached 0.03621 min<sup>−1</sup>. After VLGI-110min, the RR of RhB with IYH as the photocatalyzer was 1.094, 1.174 or 1.740 times higher than that with In<sub>2</sub>CdO<sub>4</sub>, Y<sub>2</sub>SmSbO<sub>7</sub> or N-doping TiO<sub>2</sub> (N-TO) as the photocatalyzer, respectively. The results showed that the photocatalytic activity of IYH was the highest compared with In<sub>2</sub>CdO<sub>4</sub>, Y<sub>2</sub>SmSbO<sub>7</sub>, or N-TO. With appending a trapping agent, the oxidative capability for degrading RhB, which ranged from strong to weak among three oxidative radical groups, was as follows: hydroxyl radicals > superoxide anion > holes. This work provided a scientific basis for the research which resulted in prosperous development of efficient heterojunction compound catalysts.
|
|---|