Preparation and Property Characterization of In2YSbO7/BiSnSbO6 Heterojunction Photocatalyst toward Photocatalytic Degradation of Indigo Carmine within Dye Wastewater under Visible-Light Irradiation

Jingfei Luan; Bowen Niu; Bingbing Ma; Guangmin Yang; Wenlu Liu

doi:10.3390/ma15196648

Preparation and Property Characterization of In₂YSbO₇/BiSnSbO₆ Heterojunction Photocatalyst toward Photocatalytic Degradation of Indigo Carmine within Dye Wastewater under Visible-Light Irradiation

Materials (Basel). 2022 Sep 25;15(19):6648. doi: 10.3390/ma15196648.

Authors

Jingfei Luan^{1

2}, Bowen Niu¹, Bingbing Ma¹, Guangmin Yang¹, Wenlu Liu¹

Affiliations

¹ School of Physics, Changchun Normal University, Changchun 130032, China.
² State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.

Abstract

In₂YSbO₇ and In₂YSbO₇/BiSnSbO₆ heterojunction photocatalyst were prepared by a solvothermal method for the first time. The structural characteristics of In₂YSbO₇ had been represented. The outcomes showed that In₂YSbO₇ crystallized well and possessed pyrochlore constitution, a stable cubic crystal system and space group Fd3m. The lattice parameter of In₂YSbO₇ was discovered to be a = 11.102698 Å and the band gap energy of In₂YSbO₇ was discovered to be 2.68 eV, separately. After visible-light irradiation of 120 minutes (VLGI-120M), the removal rate (ROR) of indigo carmine (IC) reached 99.42% with In₂YSbO₇/BiSnSbO₆ heterojunction (IBH) as a photocatalyst. The ROR of total organic carbon (TOC) reached 93.10% with IBH as a photocatalyst after VLGI-120M. Additionally, the dynamics constant k which was taken from the dynamic curve toward (DCT) IC density and VLGI time with IBH as a catalyst reached 0.02950 min^-1. The dynamics constant k which came from the DCT TOC density and VLGI time with IBH as a photocatalyst reached 0.01783 min^-1. The photocatalytic degradation of IC in dye wastewater (DW) with IBH as a photocatalyst under VLGI was in accordance with the first-order kinetic curves. IBH was used to degrade IC in DW for three cycles of experiments under VLGI, and the ROR of IC reached 98.74%, 96.89% and 94.88%, respectively, after VLGI-120M, indicating that IBH had high stability. Compared with superoxide anions or holes, hydroxyl radicals possessed the largest oxidative ability for removing IC in DW, as demonstrated by experiments with the addition of trapping agents. Lastly, the probable degradation mechanism and degradation pathway of IC were revealed in detail. The results showed that a visible-light-responsive heterojunction photocatalyst which possessed high catalytic activity and a photocatalytic reaction system which could effectively remove IC in DW were obtained. This work provided a fresh scientific research idea for improving the performance of a single catalyst.

Keywords: In2YSbO7; In2YSbO7/BiSnSbO6 heterojunction photocatalyst; N-doped TiO2; indigo carmine; photocatalytic degradation; visible-light irradiation.

Abstract

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