Samples of the bimetallic-based NH₂-MIL-125(Ti) at a ratio of Mⁿ⁺/Ti⁴⁺ is 0.15 (Mⁿ⁺: Ni²⁺, Co²⁺ and Fe³⁺) were first synthesized using the solvothermal method. Their fundamental properties were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectra, scanning electron microscopy (SEM), N₂ adsorption–desorption measurements, and UV–Vis diffuse reflectance spectroscopy (UV-Vis DRS). The as-acquired materials were used as high-efficiency heterogeneous photocatalysts to remove Rhodamine B (RhB) dye under visible light. The results verified that 82.4% of the RhB (3 × 10⁻⁵ M) was degraded within 120 min by 15% Fe/Ti−MOFs. Furthermore, in the purpose of degrading Rhodamine B (RhB), the rate constant for the 15% Fe/Ti-MOFs was found to be 2.6 times as fast as that of NH₂-MIL-125(Ti). Moreover, the 15% Fe/Ti-MOFs photocatalysts remained stable after three consecutive cycles. The trapping test demonstrated that the major active species in the degradation of the RhB process were hydroxyl radicals (HO^∙) and holes (h⁺).

中文翻译：

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可见光下基于NH2-MIL-125(Ti)的金属有机骨架增强降解罗丹明B

首先采用溶剂热法合成了Mn ⁺ /Ti ⁴⁺比为0.15的双金属基NH ₂ -MIL-125(Ti)样品(Mn ⁺ :Ni ²⁺ ,Co ²⁺和Fe ³⁺ )。 。_{通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、拉曼光谱、扫描电子显微镜（SEM）、N 2}吸附-解吸测量和紫外-可见漫反射光谱（UV-Vis）分析了它们的基本性质。DRS）。所得材料用作高效多相光催化剂，在可见光下去除罗丹明 B (RhB) 染料。结果证实82.4%的RhB (3 × 10 ^-5 M)在120分钟内被15% Fe/Ti−MOFs降解。此外，在降解罗丹明B（RhB）时，发现15% Fe/Ti-MOFs的速率常数是NH ₂ -MIL-125（Ti）的速率常数的2.6倍。此外，15% Fe/Ti-MOFs 光催化剂在连续三个循环后仍保持稳定。捕获测试表明，RhB 降解过程中的主要活性物种是羟基自由基 (HO ^∙ ) 和空穴 (h ⁺ )。