• Title/Summary/Keyword: Air Chemistry

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Photochemical Reaction of Nalidixic Acid in Methanol

  • Park, Hyoung-Ryun;Park, Ok-Hyun;Lee, Hong-Yune;Seo Jung-Ja;Bark, Ki-Min
    • Bulletin of the Korean Chemical Society
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    • v.24 no.11
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    • pp.1618-1622
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    • 2003

  • The photochemical reactions of methanolic nalidixic acid (NAL) solution in the absence and in the presence of air have been investigated using 300 nm UV light. From the reactions, 1-ethyl-7-methyl-4-oxo-4-hydro-1,8-naphthyridine (EMDN),formic acid, and formaldehyde are produced. In the presence of air, hydrogen peroxide is also detected along with the products listed above. The presence of oxygen during the irradiation of methanolic NAL solution effects on the product yield. The initial quantum yields of the products and of the NAL decomposition are determined. Possible reaction pathways for the photochemical reaction are suggested on the basis of the products analysis.

  • https://doi.org/10.5012/bkcs.2003.24.11.1618 인용 PDF KSCI

Chemiluminescence System with Air Pump as a Sensor for Determination of Metal Levels in Rain

  • Hong, Hyuck-Gi;Lim, H.B.
    • Bulletin of the Korean Chemical Society
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    • v.26 no.12
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    • pp.1937-1940
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    • 2005

  • A lab-made chemiluminescence system with air pump was developed for monitoring of some metal levels in rain. The air pump enabled injection of 17.7 $\mu$g samples into a glass cell filled with luminol-$H_2O_2$ reagent of typically 300 $\mu$L for chemiluminescence measurement. The monitored trend of total metal ions in the rain collected in our campus was compared with analytical results of each metal ion from GFAAS. The system was also demonstrated to determine $Cr^{6+}$ by reduction to $Cr^{3+}$ using $SnCl_2$. The limit of detection for $Cr^{6+}$ obtained by 4 measurements was 85.0 pg $mL^{-1}$ with a relative standard deviation of 3.4%. Although this system doesn’t have selectivity due to the characteristics of chemiluminescence, application of it to environmental monitoring as a sensor for some transition metal ions was demonstrated.

  • https://doi.org/10.5012/bkcs.2005.26.12.1937 인용 PDF KSCI

Carbon bead-supported copper-dispersed carbon nanofibers: An efficient catalyst for wet air oxidation of industrial wastewater in a recycle flow reactor

  • Yadav, Ashish;Verma, Nishith
    • Journal of Industrial and Engineering Chemistry
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    • v.67
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    • pp.448-460
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    • 2018

  • Copper nanoparticle-doped and graphitic carbon nanofibers-covered porous carbon beads were used as an efficient catalyst for treating synthetic phenolic water by catalytic wet air oxidation (CWAO) in a packed bed reactor over 10-30 bar and $180-230^{\circ}C$, with air and water flowing co-currently. A mathematical model based on reaction kinetics assuming degradation in both heterogeneous and homogeneous phases was developed to predict reduction in chemical oxygen demand (COD) under a continuous operation with recycle. The catalyst and process also showed complete COD reduction (>99%) without leaching of Cu against a high COD (~120,000 mg/L) containing industrial wastewater.

  • https://doi.org/10.1016/j.jiec.2018.07.019 인용 KSCI

Technology Trends of Indoor Air quality for Public transportation (대중교통 실내공기질 기술 동향)

  • Park, Mijeong;Choi, Jinsik;Park, Byung Hyun
    • Prospectives of Industrial Chemistry
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    • v.23 no.4
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    • pp.13-19
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    • 2020

  • 수년간 고농도 미세먼지 발생으로 인한 실내공기질 관리방안에 관한 논의가 계속되고 있다. 특히, 시민들이 하루에 1.75시간 이상 지하철 및 버스 등의 대중교통 내에서 머물고 있는 것으로 발표되고 있어 환경부에서는 2019년 대중교통에서의 공기질 관리 방안을 강화하는 것으로 발표한 바 있다. 최근 철도차량 등의 대중교통 차량에서 공기질 개선장치가 도입되고 있는 추세이긴 하나, 대부분의 기존 대중교통차량에서는 공기질 개선장치가 적용되어 있지 않고 대기질이 나쁨인 경우 실내 환기가 어려워 이용 시민들의 건강을 해칠 수 있는 상황이다. 이러한 상황에서 강화되는 실내공기질관리법을 만족하기 위해서는 다양한 대중교통 차량에서의 공기질 관리기술을 토대로 신규차량 뿐만 아니라 기존차량에서 적용할 수 있는 실제적인 논의가 필요하다. 본 기고문에서는 대중교통에서의 공기질 현황을 알아보고 효율적인 공기질개선을 위한 미세먼지 및 이산화탄소 저감에 관한 연구동향을 정리하고자 한다.