Abstract The magnetically separable MnFe2O4 nanoparticles (15–50 nm) are synthesized onto SnS2 microflowers (diameter 1–1.5 μm, thickness 50 nm), fabricating a direct Z-scheme MnFe2O4@SnS2 heterojunction nanocomposite via two-step hydrothermal. The MnFe2O4@SnS2 composites with an appropriate SnS2 content exhibit enhanced photo-Fenton degradation performances to make efficient separation of photoexcited electron/hole pairs. In the photo-Fenton degradation tests, MnFe2O4@SnS2-2 shows excellent performance that 92.08 % of methylene blue (MB) could be photocatalyzed within120 min with pH = 9 and 1.5 mL H2O2, which is about 2.43 times than that of bare MnFe2O4 nanoparticles. In general, the Mn2+ and Fe2+ in-situ regenerated through accepting electrons from the cathode as the result of the Z-scheme electron transfer. Moreover, over 88 % of MB is still removed in the 5th run is attributed that SnS2 driven also extend the longevity of the MnFe2O4 catalyst. Different capture agents IPA, BQ and TEOA investigation displays that ·OH is the main active specie.

中文翻译：

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PH 控制的 MnFe2O4@SnS2 纳米复合材料用于可见光光芬顿降解

摘要 将磁性可分离的 MnFe2O4 纳米粒子（15-50 nm）合成到 SnS2 微花（直径 1-1.5 μm，厚度 50 nm）上，通过两步水热法制备直接 Z 型 MnFe2O4@SnS2 异质结纳米复合材料。具有适当 SnS2 含量的 MnFe2O4@SnS2 复合材料表现出增强的光芬顿降解性能，可以有效分离光激发电子/空穴对。在光芬顿降解测试中，MnFe2O4@SnS2-2 表现出优异的性能，在 pH = 9 和 1.5 mL H2O2 条件下，120 分钟内可光催化 92.08% 的亚甲蓝 (MB)，是裸 MnFe2O4 纳米粒子的 2.43 倍. 通常，Mn2+ 和 Fe2+ 通过接受来自阴极的电子原位再生，这是 Z 型电子转移的结果。而且，在第 5 次运行中仍有超过 88% 的 MB 被去除，这归因于 SnS2 驱动也延长了 MnFe2O4 催化剂的寿命。不同捕获剂IPA、BQ和TEOA的研究表明·OH是主要的活性物质。