Development of an activated carbon filter to remove NO2 and HONO in indoor air.
To obtain the optimum removal efficiency of NO2 and HONO by coated activated carbon (ACs), the influencing factors, including the loading rate, metal and non-metal precursors, and mixture ratios, were investigated. The NOx removal efficiency (RE) for K, with the same loading (1.0 wt.%), was generally higher than for those loaded with Cu or Mn. The RE of NO2 was also higher when KOH was used as the K precursor, compared to other K precursors (KI, KNO3, and KMnO4). In addition, the REs by the ACs loaded with K were approximately 38-55% higher than those by uncoated ACs. Overall, the REs (above 95%) of HONO and NOx with 3% KOH were the highest of the coated AC filters that were tested. Additionally, the REs of NOx and HONO using a mixing ratio of 6 (2.5% PABA (p-aminobenzoic acid)+6% H3PO4):4 (3% KOH) were the highest of all the coatings tested (both metal and non-metal). The results of this study show that AC loaded with various coatings has the potential to effectively reduce NO2 and HONO levels in indoor air.
Air Development Group, Coway R&D Center, Seoul National University Research Park, 56-39, Nakseongdaero 15-gil, Gwanak-gu, Seoul 151-919, South Korea.
Jun Young
JY
Yoo
Development Division, Coway R&D Center, Seoul National University Research Park, 56-39, Nakseongdaero 15-gil, Gwanak-gu, Seoul 151-919, South Korea.
Chan Jung
CJ
Park
R&D Center, 3AC Co., Ltd., 1521-3, Sicheong-ro, Bongdam-eup, Hwaseong-si, Gyeonggi-do 445-902, South Korea.
Ki Yeong
KY
Kim
Research Division for Industry & Environment, Korea Atomic Energy Research Institute, Jeongeup-si, Jeollabuk-do 580-185, South Korea. Electronic address: sonys@kaeri.re.kr.
Youn-Suk
YS
Son
Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, 401 Park Drive, Landmark Center West Room 417, Boston, Massachusetts 02115, United States.
Choong-Min
CM
Kang
Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, 401 Park Drive, Landmark Center West Room 417, Boston, Massachusetts 02115, United States.
Jack M
JM
Wolfson
Research Division for Industry & Environment, Korea Atomic Energy Research Institute, Jeongeup-si, Jeollabuk-do 580-185, South Korea.
In-Ha
IH
Jung
Research Division for Industry & Environment, Korea Atomic Energy Research Institute, Jeongeup-si, Jeollabuk-do 580-185, South Korea.
Sung-Joo
SJ
Lee
Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, 401 Park Drive, Landmark Center West Room 417, Boston, Massachusetts 02115, United States.
Petros
P
Koutrakis
D000327:Adsorption; D000393:Air Pollutants / Q000302:isolation & purification*; D016902:Air Pollution, Indoor / Q000517:prevention & control*; D002244:Carbon / Q000737:chemistry*; D005374:Filtration; D008670:Metals / Q000032:analysis; D009585:Nitrogen Dioxide / Q000302:isolation & purification*; D009609:Nitrous Oxide / Q000302:isolation & purification*; D009812:Odorants; D011188:Potassium / Q000737:chemistry
D000393:Air Pollutants; D008670:Metals; D002244:Carbon; D009609:Nitrous Oxide; D011188:Potassium; D009585:Nitrogen Dioxide
Activated carbon filter; Air cleaner; HONO; IAQ; Indoor air; NO(2)