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Synthesis and Property Detection of the Ho2BiNbO7/ZnBiTmO4 Composite Catalyst for Photocatalytic Degradation of Brilliant Green
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DOI：10.3390/nano16150951.png)
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Abstract
En 中文
A high-performance Z-scheme Ho2BiNbO7/ZnBiTmO4 heterojunction (HZ) photocatalyst was prepared for the first time using a wet impregnation method. The HZ photocatalyst significantly improved the separation efficiency of the photoinduced electrons and the photoinduced holes; meanwhile, the HZ photocatalyst could effectively broaden the visible light spectrum via a specific mechanism of the Z-scheme heterojunction structure. The experimental results displayed that the HZ photocatalyst had strong catalytic activity when the brilliant green (BLG) was degraded. In particular, the degradation rate of BLG when using the HZ photocatalyst was found to be 99.47%, and the mineralization efficiency of the total organic carbon (TOC) concentration was found to be 98.26% when using the HZ photocatalyst under visible light irradiation (VILIIR). The HZ photocatalyst possessed higher photocatalytic activity compared with Ho2BiNbO7, ZnBiTmO4, or N-doped TiO2 (N-T). The degradation rate of BLG when using the HZ photocatalyst was 1.27 times higher than that when using Ho2BiNbO7, 1.15 times higher than that when employing ZnBiTmO4, or 2.91 times higher than that when using N-T under VILIIR. The mineralization efficiency of the TOC concentration after catalytic degradation of BLG when employing the HZ photocatalyst was 1.31 times higher than that when employing Ho2BiNbO7, 1.19 times higher than that when employing ZnBiTmO4, or 3.14 times higher than that when using N-T under VILIIR. The experimental generating radicals confirmed that the HZ photocatalyst might produce diverse reactive radicals, which contained superoxide anions (•O2−), hydroxyl radicals (•OH) and photogenerated holes (h+) after catalytic degradation of BLG. The descending order of oxidizing capacity for above three radicals was as follows: •OH > •O2− > h+. The descending order of the photocatalytic activity for the four photocatalysts was as follows: HZ > ZnBiTmO4 > Ho2BiNbO7 > N-T. The intermediate degradation products of BLG were detected by employing the HZ photocatalyst during the photocatalytic degradation process of BLG; the reliability, reusability, and stability of the HZ photocatalyst were proven by quintic cyclical degradation experiments of BLG. This study developed the degradation pathways and degradation mechanism of BLG when using the HZ photocatalyst under VILIIR. This work supplies novel thought for the design and manufacture of Z-scheme heterojunction catalysts, and it provides a basis for developing an efficient environmental remediation technique for BLG pollution.
Keywords:
Z-scheme Ho<sub>2</sub>BiNbO<sub>7</sub>/ZnBiTmO<sub>4</sub> heterojunction photocatalyst
degradation mechanism
brilliant green
visible light irradiation
catalytic degradation velocity
degradation pathway
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4.3
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2.2W
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