Development of an activated carbon filter to remove NO 2  and HONO in indoor air

Yoo, Jongman; Park, Chan Jung; Kim, Ki Yeong; Son, Youn-Suk; Kang, Choong-Min; Wolfson, Jack M.; Jung, In‐Ha; Lee, Sung‐Joo; Koutrakis, Petros

doi:10.1016/j.jhazmat.2015.02.038

Cited by 28 publications

(16 citation statements)

References 42 publications

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“…Once the flow reactor was sealed, 1.50 µL of nitric acid (70% AR Grade; UNIVAR Australia Pty. Ltd., Ingleburn, NSW, Austrilia) was injected through the septum onto the copper sheet, thus generating gaseous NO 2 by the reaction [52]:…”

Section: Biofiltration Of Elevated No 2 Concentrationsmentioning

confidence: 99%

An Assessment of the Suitability of Active Green Walls for NO2 Reduction in Green Buildings Using a Closed-Loop Flow Reactor

et al. 2019

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Nitrogen dioxide (NO 2 ) is a common urban air pollutant that is associated with several adverse human health effects from both short and long term exposure. Additionally, NO 2 is highly reactive and can influence the mixing ratios of nitrogen oxide (NO) and ozone (O 3 ). Active green walls can filter numerous air pollutants whilst using little energy, and are thus a candidate for inclusion in green buildings, however, the remediation of NO 2 by active green walls remains untested. This work assessed the capacity of replicate active green walls to filter NO 2 at both ambient and elevated concentrations within a closed-loop flow reactor, while the concentrations of NO and O 3 were simultaneously monitored. Comparisons of each pollutant's decay rate were made for green walls containing two plant species (Spathiphyllum wallisii and Syngonium podophyllum) and two lighting conditions (indoor and ultraviolet). Biofilter treatments for both plant species exhibited exponential decay for the biofiltration of all three pollutants at ambient concentrations. Furthermore, both treatments removed elevated concentrations of NO and NO 2 , (average NO 2 clean air delivery rate of 661.32 and 550.8 m 3 ·h −1 ·m −3 of biofilter substrate for the respective plant species), although plant species and lighting conditions influenced the degree of NO x removal. Elevated concentrations of NO x compromised the removal efficiency of O 3 . Whilst the current work provided evidence that effective filtration of NO x is possible with green wall technology, long-term experiments under in situ conditions are needed to establish practical removal rates and plant health effects from prolonged exposure to air pollution.

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Section: Biofiltration Of Elevated No 2 Concentrationsmentioning

confidence: 99%

An Assessment of the Suitability of Active Green Walls for NO2 Reduction in Green Buildings Using a Closed-Loop Flow Reactor

et al. 2019

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“…(61) Other than replacement of gas stoves with electric stoves, fewer methods are currently available for indoor NO 2 reduction of indoor or outdoor origin. (62, 63) In homes with smokers, recent home and school-based intervention trials in children report significant reductions in particulate matter with HEPA filter use, (64–66) but without reduction in indoor gases, without consistent reductions in markers of cigarette smoke, and with mixed success in improving child asthma symptoms. The efficacy in reducing indoor pollutants is dependent on room dimensions and building structure and conditions.…”

Section: Introductionmentioning

confidence: 99%

NIAID, NIEHS, NHLBI, and MCAN Workshop Report: The indoor environment and childhood asthma—implications for home environmental intervention in asthma prevention and management

Gold

Adamkiewicz

Arshad

et al. 2017

Journal of Allergy and Clinical Immunology

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Environmental exposures have been recognized as critical in the initiation and exacerbation of asthma, one of the most common chronic childhood diseases. The National Institute of Allergy and Infectious Diseases (NIAID), National Institute of Environmental Health Sciences (NIEHS), National Heart, Lung, and Blood Institute (NHLBI), and Merck Childhood Asthma Network (MCAN) sponsored a joint workshop to discuss the current state of the science with respect to the indoor environment and its effects on the development and morbidity of childhood asthma. The workshop included U.S. and international experts with backgrounds in allergy/allergens, immunology, asthma, environmental health, environmental exposures and pollutants, epidemiology, public health, and bioinformatics. Workshop participants provided new insights into the biologic properties of indoor exposures, indoor exposure assessment and exposure reduction techniques. This informed a primary focus of the workshop-- to critically review trials and research relevant to the prevention or control of asthma through environmental intervention. The participants identified important limitations and gaps in the scientific methodologies and knowledge, and proposed and prioritized areas for future research. The group reviewed socioeconomic and structural challenges to changing environmental exposure and offered recommendations for creative study design to overcome these challenges in trials to improve asthma management. The recommendations of this workshop can serve as guidance for future research in the study of the indoor environment and on environmental interventions as they pertain to the prevention and management of asthma and airway allergies.

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“…[7]. Therefore, the maintenance of the indoor air quality is quite needed in order to provide sustainable and healthy environment [8].…”

Section: Introductionmentioning

confidence: 99%

“…AC as an indoor air filter in order to improve indoor air quality and to reduce the cancer risk and non-cancer risk health problem. There are many researchers' studies on increasing the pore development of palm shell activated carbon [8,13,14,[19][20][21][22]. The pore development on activated carbon can be increased by undergoing physical and chemical treatment.…”

Section: Introductionmentioning

confidence: 99%

Indoor Air Contaminant Adsorption By Palm Shell Activated Carbon Filter – A Proposed Study

et al. 2016

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Abstract. Indoor air contaminant is a public issue. High Volatile Organic Compound (VOC), Carbon monoxide (CO), Carbon dioxide (CO 2 ), and particulate matter is becoming main issue that needs to solve. Therefore, this study focus on improving indoor air quality by using activated carbon (AC) for Ventilation and Air-Conditioning (VAC). It investigated because AC is widely explored but developing AC as a filter for VAC is not developed yet. The AC prepared by physical and chemical activation process and combination both of process and it was activated by H 3 PO 4 and NaOH. Characterization and analysis process are consists of water content, ash content, bulk density, adsorption capacity, iodine number and indoor air filtering analysis. Treated activated carbon potential in achieving higher surface area of the structure to the range of 950 to 1150 m 2 /g for gas phase application. The higher surface area will adsorb more air pollution. Maintained properties of activated carbon such as hardness, density, pore, extractable ash, particle size (12 by 40 mesh) and pH are becoming the main concern in achieving high quality of activated carbon.

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Development of an activated carbon filter to remove NO 2 and HONO in indoor air

Cited by 28 publications

References 42 publications

An Assessment of the Suitability of Active Green Walls for NO2 Reduction in Green Buildings Using a Closed-Loop Flow Reactor

An Assessment of the Suitability of Active Green Walls for NO2 Reduction in Green Buildings Using a Closed-Loop Flow Reactor

NIAID, NIEHS, NHLBI, and MCAN Workshop Report: The indoor environment and childhood asthma—implications for home environmental intervention in asthma prevention and management

Indoor Air Contaminant Adsorption By Palm Shell Activated Carbon Filter – A Proposed Study

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