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Fabrication of carbon nanotube functionalized MIL-101(Fe) for enhanced visible-light photocatalysis of ciprofloxacin in aqueous solution

机译:碳纳米管官能化MIL-101(Fe)的制备,以增强水溶液中环丙沙星的可见光光催化作用

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Improving the performance of metal-organic frameworks (MOFs) through modifications is an important issue to expand their potential applications. In the current study, multi-walled carbon nanotube functionalized MIL-101(Fe) (CNT@MIL-101(Fe)) was synthesized and used to construct a visible-light photocatalysis system for elimination of ciprofloxacin. CNT@MIL-101(Fe) has a lower band gap energy (2.19 eV) than MIL-101(Fe) (2.46 eV), rendering it the visible light absorption from 400 nm to 565 nm. In the CNT@MIL-101(Fe)-photocatalysis system, some optimized reaction conditions were: CNT doping ratio=5%, pH=3.0, [H2O2] vs. [CNT@MIL-101(Fe)] mass ratio = 11.3. Under 2.0 mW cm(-2) visible light irradiation, degradation of ciprofloxacin followed an apparent pseudo-first-order kinetic reaction rate at 6.85x10(-4) s(-1). Using CNT@MIL101(Fe), faster activation and electron transfer were achieved due to the high conductibility of CNT, resulting in a higher removal efficiency of ciprofloxacin (3.02 mu M, similar to 90% at 45 min) than using MIL-101(Fe) (similar to 65%). Furthermore, the iron ions leakage of CNT@MIL-101(Fe) was only half the one of MIL-101(Fe), suggesting a better stability in water. The reactive mechanism was confirmed to be % OH oxidation, in which visible photocatalysis was the dominant reaction. Generally, CNT@MIL-101(Fe) has enhanced performance and stability, which can act as potential catalyst of organic contaminants.
机译:通过修改来提高金属有机框架(MOF)的性能是扩展其潜在应用的重要问题。在当前的研究中,合成了多壁碳纳米管功能化的MIL-101(Fe)(CNT @ MIL-101(Fe)),并用于构建可见光光催化体系以消除环丙沙星。 CNT @ MIL-101(Fe)具有比MIL-101(Fe)(2.46 eV)低的带隙能量(2.19 eV),使其在400 nm至565 nm的可见光范围内吸收。在CNT @ MIL-101(Fe)-光催化系统中,一些优化的反应条件为:CNT掺杂比例= 5%,pH = 3.0,[H2O2]与[CNT @ MIL-101(Fe)]质量比= 11.3。 。在2.0 mW cm(-2)可见光照射下,环丙沙星的降解遵循6.85x10(-4)s(-1)的表观拟一级动力学反应速率。使用CNT @ MIL101(Fe),由于CNT的高电导率,因此可以实现更快的活化和电子转移,从而比使用MIL-101(300分钟时,环丙沙星的去除效率更高(3.02μM,在45分钟时接近90%))。 Fe)(大约65%)。此外,CNT @ MIL-101(Fe)的铁离子泄漏仅为MIL-101(Fe)的一半,表明在水中具有更好的稳定性。证实反应机理是%OH氧化,其中可见光催化是主要反应。通常,CNT @ MIL-101(Fe)具有增强的性能和稳定性,可以用作有机污染物的潜在催化剂。

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