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基于NH-MIL-125(Ti)的金属有机框架在可见光下对罗丹明B的增强降解作用

Enhanced Degradation of Rhodamine B by Metallic Organic Frameworks Based on NH-MIL-125(Ti) under Visible Light.

作者信息

Nguyen Thi Hong-Tham, Tran Thi Kim-Ngan, Hoang Ngoc Bich, Tran Bich Thuy, Do Trung Sy, Phung Chi Sy, Nguyen Thi Kim-Oanh

机构信息

Institute of Environmental Sciences, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam.

Vo Giu High School, Hoai An District, Binh Dinh Province 55000, Vietnam.

出版信息

Materials (Basel). 2021 Dec 15;14(24):7741. doi: 10.3390/ma14247741.

DOI:10.3390/ma14247741
PMID:34947348
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8704260/
Abstract

Samples of the bimetallic-based NH-MIL-125(Ti) at a ratio of M/Ti is 0.15 (M: Ni, Co and Fe) 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), N 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 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 NH-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).

摘要

首先采用溶剂热法合成了M/Ti比例为0.15（M：Ni、Co和Fe）的双金属基NH-MIL-125（Ti）样品。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吸附-脱附测量和紫外-可见漫反射光谱（UV-Vis DRS）对其基本性质进行了分析。将所获得的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。结果表明，15%Fe/Ti-MOFs在120分钟内可降解82.4%的RhB（3×10 M）。此外，为了降解罗丹明B（RhB），发现15%Fe/Ti-MOFs的速率常数是NH-MIL-125（Ti）的2.6倍。而且，15%Fe/Ti-MOFs光催化剂在连续三个循环后仍保持稳定。捕获试验表明，RhB降解过程中的主要活性物种是羟基自由基（HO）和空穴（h）。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/38b9/8704260/ca5dd758d083/materials-14-07741-g010.jpg
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