Bimetallic FexMny catalysts derived from metal organic frameworks for efficient photocatalytic removal of quinolones without oxidant,Environmental Science: Nano

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Bimetallic FexMny catalysts derived from metal organic frameworks for efficient photocatalytic removal of quinolones without oxidant
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-08-03 , DOI: 10.1039/d1en00237f
Xin Li _{1,

2,

3,

4,

5} , Zhiyu Yang _{1,

2,

3,

4,

5} , Di Hu _{1,

2,

3,

4,

5} , Anqi Wang _{1,

2,

3,

4,

5} , Yuwen Chen _{1,

2,

3,

4,

5} , Yizhe Huang _{1,

2,

3,

4,

5} , Man Zhang _{1,

2,

3,

4,

5} , Haoran Yuan _{5,

6,

7,

8} , Kai Yan _{1,

2,

3,

4,

5}

Affiliation

Quinolones are widely used in the pharmaceutical industry; however, the high residue of these antibiotics has caused serious water quality issues, and their effective removal is still a great challenge. In this work, bimetallic magnetic Fe_xMn_y catalysts are prepared by a facile impregnation method and are efficient for photocatalytic removal of five typical quinolone pollutants without oxidant under simulated light irradiation. The fabricated bimetallic magnetic Fe_xMn_y catalyst with the Fe³⁺/Mn²⁺ ratio of 1 : 1 exhibits a large surface area of 122.5 m² g⁻¹, highly porous structure, rich defects and a covalent metal environment. These fabricated semiconductor catalysts can degrade 98.3% of ciprofloxacin (CIP), 96.0% of ofloxacin (OFL), 91.0% of enrofloxacin (ENR), 92.2% of levofloxacin (LEV), and 93.5% of norfloxacin (NOR) in 30 min without using any oxidant. The magnetic Fe_xMn_y catalysts can be simply recycled using a magnet and maintain high stability, avoiding complex recycling procedures. Even after five cycles, the degradation rate of CIP was still over 92.0%. The degradation performance is far superior to that of most previously reported candidates. The bimetallic Fe_xMn_y catalyst improves the ability to capture sunlight, increases the interface charge transfer rate, and inhibits the recombination of photogenerated electron–hole pairs. In addition, the mechanism and the main intermediates in the photocatalytic degradation of CIP are explored by quenching experiments, electron paramagnetic resonance (EPR) and liquid chromatography-mass spectrometry (LC-MS) analysis. These noble-metal free magnetic Fe_xMn_y catalysts provide a promising opportunity for advanced photocatalytic oxidation technology to treat wastewater.

中文翻译：

源自金属有机骨架的双金属 FexMny 催化剂可在无氧化剂的情况下有效光催化去除喹诺酮类

喹诺酮类药物广泛用于制药工业；然而，这些抗生素的高残留已经造成了严重的水质问题，有效去除它们仍然是一个巨大的挑战。在这项工作中，双金属磁性 Fe _x Mn _y催化剂通过简单的浸渍方法制备，在模拟光照射下可有效地光催化去除五种典型的喹诺酮类污染物，无需氧化剂。制备的Fe ³⁺ /Mn ²⁺比为1:1的双金属磁性Fe _x Mn _y催化剂具有122.5 m ² g ^-1的大表面积、高度多孔的结构、丰富的缺陷和共价金属环境。这些制造的半导体催化剂可以降解 98.3% 的环丙沙星 (CIP)、96.0% 的氧氟沙星 (OFL)、91.0% 的恩诺沙星 (ENR)、92.2% 的左氧氟沙星 (LEV) 和 93.5% 的诺氟沙星 (NOR)使用任何氧化剂。磁性Fe _x Mn _y催化剂可以使用磁铁简单回收并保持高稳定性，避免复杂的回收程序。即使经过5个循环，CIP的降解率仍然在92.0%以上。降解性能远优于大多数先前报道的候选物。双金属 Fe _x Mn _y催化剂提高了捕获阳光的能力，增加了界面电荷转移率，并抑制了光生电子-空穴对的复合。此外，通过猝灭实验、电子顺磁共振（EPR）和液相色谱-质谱（LC-MS）分析探索了CIP光催化降解的机理和主要中间体。这些不含贵金属的磁性 Fe _x Mn _y催化剂为先进的光催化氧化技术处理废水提供了有希望的机会。

更新日期：2021-08-03

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