Gamma-irradiated copper-based metal organic framework nanocomposites for photocatalytic degradation of water pollutants and disinfection of some pathogenic bacteria and fungi.

IF 4 2区 生物学 Q2 MICROBIOLOGY
Gharieb S El-Sayyad, Ahmed M El-Khawaga, Huda R M Rashdan
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引用次数: 0

Abstract

Background: Although there are many uses for metal-organic framework (MOF) based nanocomposites, research shows that these materials have received a lot of interest in the field of water treatment, namely in the photodegradation of water contaminants, and disinfection of some pathogenic bacteria and fungi. This is brought on by excessive water pollution, a lack of available water, low-quality drinking water, and the emergence of persistent micro-pollutants in water bodies. Photocatalytic methods may be used to remove most water contaminants, and pathogenic microbes, and MOF is an excellent modifying and supporting material for photocatalytic degradation.

Methods: This work involved the fabrication of a unique Cu-MOF based nanocomposite that was exposed to gamma radiation. The nanocomposite was subsequently employed for photocatalytic degradation and as an antimicrobial agent against certain harmful bacteria and fungi. The produced Cu-MOf nanocomposite was identified by XRD, SEM, and EDX. Growth curve analysis, UV lighting impact, and antibiofilm potential have been carried out to check antimicrobial potential. Additionally, the membrane leakage test was used to determine the mechanism of the antimicrobial action. In an experimental investigation of photocatalytic activity, a 50 mL aqueous solution including 10.0 ppm of Rhodamine B (RB) was used to solubilize 10 mg of Cu-MOF. It has been investigated how pH and starting concentration affect RB elimination by Cu-MOF. Ultimately, RB elimination mechanism and kinetic investigations have been carried out.

Results: SEM images from the characterization techniques demonstrated the fact that the Cu-MOF was synthesized effectively and exhibited the Cu-MOF layers' flake-like form. Uneven clusters of rods make up each stratum. The primary peaks in the Cu-MOF's diffraction pattern were found at 2θ values of 8.75, 14.83, 17.75, 21.04, 22.17, 23.31, 25.41, and 26.38, according to the XRD data. After 135 min of UV irradiation, only 8% of RB had undergone photolytic destruction. On the other hand, the elimination resulting from adsorption during a 30-min period without light was around 16%. Conversely, after 135 min, Cu-MOF's photocatalytic breakdown of RB with UV light reached 81.3%. At pH 9.0, the greatest removal of RB at equilibrium was found, and when the amount of photocatalyst rose from 5 to 20 mg, the removal efficiency improved as well. The most sensitive organism to the synthesized Cu-MOF, according to antimicrobial data, was Candida albicans, with a documented MIC value of 62.5 µg mL-1 and antibacterial ZOI as 32.5 mm after 1000 ppm treatment. Cu-MOF also showed the same MIC (62.5 µg mL-1) values against Staphylococcus aureus and Escherichia coli, and 35.0 and 32.0 mm ZOI after 1000 ppm treatment, respectively. Ultimately, it was found that Cu-MOF (1000 µg/mL) after having undergone gamma irradiation (100.0 kGy) was more effective against S. aureus (42.5 mm ZOI) and E. coli (38.0 mm ZOI).

Conclusion: From the obtained results, the synthesized MOF nanocomposites had promising catalytic degradation of RB dye and high antimicrobial potential which encouraging their use in wastewater treatment against some pathogenic microbes and polluted dyes. Due to the exceptional physicochemical characteristics of MOF nanocomposites, it is possible to create and modify photocatalytic nanocomposites in a way that improves their recovery, efficiency, and recyclability.

伽马射线辐照铜基金属有机框架纳米复合材料用于光催化降解水污染物和消毒某些致病细菌和真菌。
背景:尽管基于金属有机框架(MOF)的纳米复合材料有很多用途,但研究表明,这些材料在水处理领域,即在水污染物的光降解以及一些致病细菌和真菌的消毒方面受到了广泛关注。水污染过度、可用水源不足、饮用水质量低劣以及水体中出现持久性微污染物等因素都会导致水污染问题。光催化方法可用于去除大多数水污染物和病原微生物,而 MOF 是光催化降解的极佳修饰和辅助材料:这项工作包括制造一种独特的铜-MOF 纳米复合材料,并将其暴露在伽马射线下。该纳米复合材料随后被用于光催化降解,并用作抗菌剂来对抗某些有害细菌和真菌。通过 XRD、SEM 和 EDX 对制备的 Cu-MOf 纳米复合材料进行了鉴定。还进行了生长曲线分析、紫外线光照影响和抗生物膜潜力测试,以检验其抗菌潜力。此外,还利用膜渗漏试验来确定抗菌作用的机理。在光催化活性的实验研究中,用 50 mL 含有 10.0 ppm 罗丹明 B (RB) 的水溶液来溶解 10 mg 的 Cu-MOF。研究了 pH 值和起始浓度对 Cu-MOF 消除罗丹明 B 的影响。最后,还进行了 RB 消除机制和动力学研究:表征技术的扫描电子显微镜图像表明,Cu-MOF 的合成非常有效,并呈现出片状的 Cu-MOF 层。每个层中都有不均匀的棒簇。根据 XRD 数据,Cu-MOF 衍射图谱中的主峰分别位于 2θ 值为 8.75◦、14.83◦、17.75◦、21.04◦、22.17◦、23.31◦、25.41◦ 和 26.38◦处。紫外线照射 135 分钟后,只有 8% 的 RB 发生光解破坏。另一方面,在没有光照的 30 分钟内,因吸附而产生的消除量约为 16%。相反,135 分钟后,Cu-MOF 在紫外线照射下对 RB 的光催化分解达到了 81.3%。当光催化剂的用量从 5 毫克增加到 20 毫克时,去除效率也有所提高。根据抗菌数据,对合成的 Cu-MOF 最敏感的生物是白色念珠菌,在处理 1000 ppm 后,MIC 值为 62.5 µg mL-1,抗菌 ZOI 为 32.5 mm。Cu-MOF 对金黄色葡萄球菌和大肠杆菌也显示出相同的 MIC 值(62.5 µg mL-1),经 1000 ppm 处理后,ZOI 分别为 35.0 mm 和 32.0 mm。最终发现,经过伽马射线照射(100.0 kGy)后的 Cu-MOF(1000 µg/mL)对金黄色葡萄球菌(42.5 mm ZOI)和大肠杆菌(38.0 mm ZOI)更有效:从所获得的结果来看,合成的 MOF 纳米复合材料对 RB 染料具有良好的催化降解效果和较高的抗菌潜力,这有助于它们在废水处理中用来对付一些病原微生物和受污染的染料。由于 MOF 纳米复合材料具有优异的物理化学特性,因此有可能通过制造和改性光催化纳米复合材料来提高其回收率、效率和可循环性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BMC Microbiology
BMC Microbiology 生物-微生物学
CiteScore
7.20
自引率
0.00%
发文量
280
审稿时长
3 months
期刊介绍: BMC Microbiology is an open access, peer-reviewed journal that considers articles on analytical and functional studies of prokaryotic and eukaryotic microorganisms, viruses and small parasites, as well as host and therapeutic responses to them and their interaction with the environment.
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