Study of photocatalytic inactivation of airborne microorganisms on various functionalized filter media: comparative analysis

IF 2.9 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Marina Flores, Claudio Passalía, Marisol Daniela Labas, Rodolfo Juan Brandi
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引用次数: 0

Abstract

Airborne microorganisms can cause various adverse effects, including infectious, allergic, and immunotoxic diseases. Bioaerosols are also one of the main causes of morbidity and mortality, as well as a heavy burden on health costs. The present study models and compares the inactivation performance of three commercial air filters, industrial and domestic use (vacuum cleaner) with and without catalyst (TiO2) deposition for a model microorganism under UVA radiation. The filters were studied regarding catalysis load, adherence, optical properties, morphology, and cost. The microorganism used was E. coli, it was distributed emulating Flügge droplets on coated and uncoated filters and then exposed to UVA radiation at different humidity conditions. Different methods of bacterial spreading and counting on filters were tested. A simple kinetic model was proposed and validated to compare the inactivation performances of photocatalysis and photolysis; the modeling results enabled the prediction of inactivation efficiency and analysis of several parameters. To compare the photocatalytic activity of the functionalized filters we calculated D90, the dose to reduce one bacterial log, and a pseudo-constant of the inactivation rate per unit mass of catalyst deposited. Our experimental findings of TiO2-coated fiberglass filters presented in this study suggest that scaling up and its subsequent development in ventilation systems would be successful.

Abstract Image

各种功能化过滤介质光催化灭活空气中微生物的研究:比较分析
摘要 空气中的微生物会造成各种不良影响,包括感染性、过敏性和免疫毒性疾病。生物气溶胶也是导致发病和死亡的主要原因之一,并对医疗成本造成沉重负担。本研究模拟并比较了三种商用空气过滤器(工业用和家用(真空吸尘器))在 UVA 辐射下有催化剂(TiO2)沉积和无催化剂沉积时对模型微生物的灭活性能。对过滤器的催化负载、附着力、光学特性、形态和成本进行了研究。使用的微生物是大肠杆菌,将其仿照弗吕格液滴分布在有涂层和无涂层的滤光片上,然后在不同的湿度条件下暴露在 UVA 辐射下。测试了细菌在过滤器上扩散和计数的不同方法。为比较光催化和光解的灭活性能,提出并验证了一个简单的动力学模型;建模结果有助于预测灭活效率和分析多个参数。为了比较功能化过滤器的光催化活性,我们计算了 D90(减少一个细菌对数的剂量)和单位质量沉积催化剂的灭活率伪常数。我们在本研究中介绍的涂有二氧化钛的玻璃纤维过滤器的实验结果表明,在通风系统中进行放大和后续开发将是成功的。
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来源期刊
Air Quality Atmosphere and Health
Air Quality Atmosphere and Health ENVIRONMENTAL SCIENCES-
CiteScore
8.80
自引率
2.00%
发文量
146
审稿时长
>12 weeks
期刊介绍: Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health. It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes. International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals. Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements. This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
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