Multifunctional CeO2/Co3O4@polyacrylonitrile nanofibers for high-efficiency air-pollutant removal

2021 ◽  
pp. 004051752110457
Author(s):  
Qi Wang ◽  
Tingting Hu ◽  
Wenqi Zhang ◽  
Zhenlin Jiang ◽  
Pinhua Rao
Keyword(s):  
Air Pollutants ◽  
High Efficiency ◽  
Air Pollutant ◽  
Pollutant Removal ◽  
Total Volatile ◽  
Pressure Drops ◽  
Volatile Organic ◽  
Nanofiber Membranes ◽  
Total Volatile Organic Compounds ◽  
Pan Nanofiber

As many countries in the world are paying increasing attention to air quality, reducing the concentration of pollutants in the air, protecting human health and improving the ecological environment have become problems that need to be solved urgently. This paper describes how ceria and cobalt tetroxide@polyacrylonitrile (CeO2/Co3O4@PAN) nanofiber membranes are produced using electrospinning technology, which have broad applications for the removal of air pollutants. Results show that CeO2/Co3O4@PAN has high electrostatic attraction to particulate matter (PM). CeO2/Co3O4@PAN membranes show better mechanical properties, thermal stability and air-purification performance than pure PAN membranes. Nanofiber membranes with 5 wt% of CeO2/Co3O4 have excellent removal efficiency: 93.4% and 94.5% for PM2.5 and PM10, respectively, and 96.2% and 98% for formaldehyde and total volatile organic compounds, respectively. They also show low pressure drops, high stability and good recyclability. This work shows that they are promising candidates as highly stable, recyclable and efficient agents for the removal of air pollutants.

scholarly journals A Novel Approach of Ultraviolet Germicidal Irradiation to Reduce Air Pollution in Indoor Environments

2017 ◽  
Author(s):  
Chao-Yun Liu ◽  
Chao-Heng Tseng ◽  
Huang-Chin Wang ◽  
Chuan-Fa Dai ◽  
Yi-Hsuan Shih
Keyword(s):  
Air Pollutants ◽  
Field Studies ◽  
Indoor Environments ◽  
Total Volatile ◽  
Ultraviolet Germicidal Irradiation ◽  
Novel Approach ◽  
Volatile Organic ◽  
Bacteria And Fungi ◽  
Total Volatile Organic Compounds

This study examined the use of high dosages of ultraviolet germicidal irradiation (UVGI) (253.7 nm) to deal with various concentrations of air pollutants, such as formaldehyde (HCHO), total volatile organic compounds (TVOC), under various conditions of humidity. We also estimated the emission of ozone as a secondary pollutant of UVGI as treatment. A number of irradiation methods were applied for various durations in field studies to examine the efficiency of removing HCHO, TVOC, bacteria, and fungi. The removal efficiency of air pollutants (HCHO and bacteria) through long-term exposure to UVGI appears to increase with time. The effects on TVOC and fungi concentration were insignificant in the first week; however, improvements were observed in the second week. No differences were observed among the various irradiation methods in this study regarding the removal of HCHO and TVOC; however significant differences were observed in the removal of bacteria and fungi.

scholarly journals Measurements of Indoor Air Pollutant Levels in a University Office Building

2007 ◽  
Vol 2 (4) ◽  
pp. 123-129 ◽  
Author(s):  
João F.P Gomes ◽  
J. C. M Bordado ◽  
Georgina Sarmento ◽  
José Dias
Keyword(s):  
Indoor Air ◽  
Chemical Species ◽  
Air Pollutant ◽  
Total Volatile ◽  
Organic Species ◽  
Pollutant Concentrations ◽  
Volatile Organic ◽  
Specific Individual ◽  
Total Volatile Organic Compounds ◽  
Indoor And Outdoor

This work consisted of a series of determinations performed in typical rooms of a building belonging to the Technical University of Lisbon, which is located in a central urban area of Lisbon. The main objective was to evaluate the Indoor Air Quality (IAQ) of the rooms so that further corrective measures could be taken if unsatisfactory IAQ levels were to be found. Correlations were derived, between indoor and outdoor pollutant concentrations, in order to assess the existence of contaminations coming from outside. Also, correlations were derived between total volatile organic compounds (VOC) concentrations and specific individual organic species measured in the same room. The methodology recorded in this paper is effective to assess compliance analysis of total VOCs, however, it seems somewhat limited to determine specific individual chemical species responsible for obtaining high total VOC concentrations.

scholarly journals Investigations of Museum Indoor Microclimate and Air Quality. Case Study from Romania

Atmosphere ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 286
Author(s):  
Dorina Camelia Ilieș ◽  
Florin Marcu ◽  
Tudor Caciora ◽  
Liliana Indrie ◽  
Alexandru Ilieș ◽  
...  
Keyword(s):  
Air Quality ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Construction Materials ◽  
International Standards ◽  
Total Volatile ◽  
Negative Effects ◽  
Museum Exhibits ◽  
Volatile Organic ◽  
Total Volatile Organic Compounds

Poor air quality inside museums is one of the main causes influencing the state of conservation of exhibits. Even if they are mostly placed in a controlled environment because of their construction materials, the exhibits can be very vulnerable to the influence of the internal microclimate. As a consequence, museum exhibits must be protected from potential negative effects. In order to prevent and stop the process of damage of the exhibits, monitoring the main parameters of the microclimate (especially temperature, humidity, and brightness) and keeping them in strict values is extremely important. The present study refers to the investigations and analysis of air quality inside a museum, located in a heritage building, from Romania. The paper focuses on monitoring and analysing temperature of air and walls, relative humidity (RH), CO2, brightness and particulate matters (PM), formaldehyde (HCHO), and total volatile organic compounds (TVOC). The monitoring was carried out in the Summer–Autumn 2020 Campaign, in two different exhibition areas (first floor and basement) and the main warehouse where the exhibits are kept and restored. The analyses aimed both at highlighting the hazard induced by the poor air quality inside the museum that the exhibits face. The results show that this environment is potentially harmful to both exposed items and people. Therefore, the number of days in which the ideal conditions in terms of temperature and RH are met are quite few, the concentration of suspended particles, formaldehyde, and total volatile organic compounds often exceed the limit allowed by the international standards in force. The results represent the basis for the development and implementation of strategies for long-term conservation of exhibits and to ensure a clean environment for employees, restorers, and visitors.

scholarly journals Passive Sampling Method for Total Volatile Organic Compounds in Indoor Air

2018 ◽  
Vol 21 (1) ◽  
pp. 41-49
Author(s):  
Takahiro ISHIZAKA ◽  
Ayato KAWASHIMA ◽  
Naoki HISHIDA ◽  
Noriaki HAMADA
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Passive Sampling ◽  
Sampling Method ◽  
Total Volatile ◽  
Volatile Organic ◽  
Total Volatile Organic Compounds
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