• Title/Summary/Keyword: Acenaphthene

Search Result 30, Processing Time 0.028 seconds

Isotherm, Kinetic and Thermodynamic Characteristics for Adsorption of Acenaphthene onto Sylopute (실로퓨트에 의한 아세나프텐 흡착에 관한 등온흡착식, 동역학 및 열역학적 특성)

  • Cho, Da-Nim;Kim, Jin-Hyun
    • Korean Chemical Engineering Research
    • /
    • v.58 no.1
    • /
    • pp.127-134
    • /
    • 2020
  • The adsorption characteristics of the major tar compound, acenaphthene, derived from Taxus chinensis by the commercial adsorbent Sylopute were investigated using different parameters such as initial acenaphthene concentration, adsorption temperature, and contact time. Out of Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models, adsorption data were best described by Langmuir isotherm. The adsorption kinetics was evaluated by pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The pseudo-second-order model was found to explain the adsorption kinetics most effectively. Thermodynamic parameters revealed the feasibility, nonspontaneity and exothermic nature of adsorption. In addition, the isosteric heat of adsorption was independent of surface loading indicating the Sylopute used as an energetically homogeneous surface.

Degradation characteristics of acenaphthene or acenaphthylene by Fenton oxidation (펜톤산화에 의한 acenaphthene 또는 acenaphthylene 분해특성)

  • Lee, Byung-Dae;Kim, Yeoung-Chan
    • Journal of the Korean Applied Science and Technology
    • /
    • v.24 no.1
    • /
    • pp.47-53
    • /
    • 2007
  • The acenaphthene(ACE) or acenaphthylene(ACEL) is one of the most frequently found compound in polycyclic aromatic hydrocarbon (PAH)-contaminated soil. In this study, we make 10mg/L ACE or ACEL in ethanol which is the model washing solvent for contaminated soil. This was followed by Fenton treatment in which 0.2 or 0.3mL of 30% $H_2O_2$ and 0.2 ml of 0.5 M $Fe^{2+}$ were added. The results showed more than 88 or 99% of ACE or ACEL removal efficiency, respectively. Additionally, we employed GC-MS to identify the main oxidation product generated by the optimized Fenton oxidation [i.e., ACE or ACEL degraded in to 21, 34 % 1,8-naphthalic anhydride(NAPAN), repectively]. It is expected that biodegradability of NAPAN is enhanced because NAPAN has three oxygens compared with ACE and ACEL. Therefore the results suggest that the hybrid treatment system (i.e., ethanol washing -Fenton oxidation treatment) can be effectively applied to remove ACE or ACEL from soil..

Identification and Quantification of Tar Compounds in Plant Cell Cultures of Taxus chinensis (주목 식물세포(Taxus chinensis) 배양 유래 타르 성분 동정 및 정량)

  • Kim, Gun-Joong;Park, Gyu-Yeon;Kim, Jin-Hyun
    • Microbiology and Biotechnology Letters
    • /
    • v.41 no.3
    • /
    • pp.272-277
    • /
    • 2013
  • In this study, the tar compounds derived from the plant cell cultures of Taxus chinensis were first identified and then quantified via gas chromatography/mass spectrometry (GC/MS) and gas chromatography (GC). 2-Picoline, 2,5-xylenol, acenaphthene, 1-methylnaphthalene and o-xylene were found to be the major tar compounds by biomass. These compounds were identified and confirmed by comparing their retention times with those of authentic compounds. Each compound also spiked with the pure standard. The contents of 2-picoline, 2,5-xylenol, acenaphthene, 1-methylnaphthalene, and o-xylene in biomass were 0.2512, 0.1586, 0.1240, 0.0942 and 0.0525 wt%, respectively. Liquid-liquid extraction and adsorbent treatment were able to remove 42% and 94% of the tars from biomass, respectivly. After hexane precipitation, all of the tars were perfectly removed.

Simultaneous Determination of Polycyclic Aromatic Hydrocarbons by Synchronous Spectrofluorimetry (형광분광법에 의한 방향족 탄화수소의 동시정량)

  • 이상학;손범목
    • Journal of Environmental Science International
    • /
    • v.12 no.1
    • /
    • pp.87-92
    • /
    • 2003
  • Synchronous spectrofluorimetry was carried out for the simultaneous determination of various polycyclic aromatic hydrocarbons(PAHs) in aqueous solution by fluorescence spectrometry have been studied. The optimal wavelength interval(${\triangle}{\lambda}$) for synchronous spectra of acenaphthene, anthracene, benzo[a]anthracene, fluorene and pyrene were investigated in the presence of surfactants. The great enhancement of the fluorescence of these PAHs in Triton X-100 was obtained and optimal wavelength was 50 nm. The calibration curves in synthetic mixture solution of 5 PAHs were linear over the range from $1.0{\times}10^{-8}M$ to $1.0{\tiems}10^{-4}M$. Under the optimal experimental conditions, the detection limits were $4.9{\tiems}10^{-9}M$,\;7.0{\times}10^{-9}M,\;4.7{\tiems}10^{-9}M,\;1.6{\tiems}10^{-9}M$ and $3.2{\tiems}10^{-9}M$ for acenaphthene, anthracene, benzo[a]anthracene, fluorene and pyrene, respectively.

PAHs Degrading Bacterium Separation and Identification for Biological Treatment (PAHs의 생물학적 처리를 위한 분해 미생물 분리 동정)

  • Kim, Man;Choi, Kyoung-Kyoon;Go, Myong-Jin;Park, Jeong-Hun
    • Journal of Soil and Groundwater Environment
    • /
    • v.12 no.6
    • /
    • pp.70-77
    • /
    • 2007
  • Pseudomonas sp. KM1 was separated from soil contaminated by petroleum and identified. The isolated strain is Gram-positive, rod-shaped and immotile. In batch culture, the optimum cultivation temperature and pH was $35^{\circ}C$ and 7, respectively. Biodegradation of PAHs experiment with soil slurry system was performed using Pseudomonas sp. KM1. Pseudomonas sp. KM1 could degrade 7 PAHs including naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, pyrene, and fluoranthene. These mixed PAHs was easily degraded within one day except fluoranthene, which was degraded much slowly, taking several days by this isolated bacteria. Pseudomonas sp. KM1 is good candidate for bioremediation of PAHs contaminated soils. Biodegradation rates of naphthalene, phenanthrene and pyrene in soils were different at each soil, and the rates were decreased as sorption capacity increased.

Acute Toxicity of Heavy Metals, Tributyltin, Ammonia and Polycyclic Aromatic Hydrocarbons to Benthic Amphipod Grandidierella japonica

  • Lee, Jung-Suk;Lee, Kyu-Tae;Park, Gyung-Soo
    • Ocean Science Journal
    • /
    • v.40 no.2
    • /
    • pp.61-66
    • /
    • 2005
  • Benthic amphipod, Grandidierella japonica widely inhabits the Korean coastal waters and is developed as a standard test species for sediment toxicity tests. We exposed G. japonica to various pollutants including 4 kinds of inorganic metals (Ag, Cd, Cu and Hg), tributyltin [TBT], ammonia and 7 polycyclic aromatic hydrocarbon (PAH) compounds (acenaphthene, chrysene, fluoranthene, fluorene, naphthalene, phenanthrene and pyrene) to estimate the no observed effect concentration (NOEC) and the median lethal concentration (LC50) of each pollutant during the 96-hour acute exposure. Among all tested pollutants, TBT was most toxic to G. japonica, and Rg was most toxic among inorganic metals. The toxicity of pyrene to G. japonica was greatest among PAH compounds, followed by fluoranthene, phenanathrene, acenaphthene, fluorene and naphthalene. The toxicity of PAH compounds was closely related to their physico-chemical characteristics such as $K_ow$ and water solubility. G. japonica responded adequately to pollutant concentrations and exposure durations, and the sensitivity of G. japonica to various inorganic and organic pollutants was generally comparable to other amphipods used as standard test species in ecotoxicological studies, indicating this species can be applied in the assessment of environments polluted by various harmful substances.

Applicability on Microwave Technology to the Remediation of PAHs(Polynuclear Aromatic Hydrocarbons) Contaminated Soil (PAHs(Polynuclear Aromatic Hydrocarbons)에 오염된 토양 회복공정으로서 마이크로파의 적용성 검토연구)

  • 문경환;변자진;김덕찬
    • Journal of environmental and Sanitary engineering
    • /
    • v.13 no.3
    • /
    • pp.102-112
    • /
    • 1998
  • The fate of polynuclear aromatic hydrocarbons(PAMs) in soil has drawn increasing concern due to their toxic, carcinogenic, and mutagenic effects. These compounds have been most commonly carried into the soil in solvent, as in a coal tar or cresote. This study has been focused on the applicability of microwave treatment of soils contaminated by PAHs. Studies have been conducted with soil(particle diameter $150~500{\mu}m$), which was spiked with naphthalene, acenaphthene, fluorene, anthracene and pyrene, with different moisture contents. According to the results of the research, up to 95% removal efficiency of naphthalene was observed in 10% moisturized soil for five minutes microwave inducing And the removal efficiency of acenaphthene and fluorene were observed to be 88.9%, 67.2% in 30% moisturized soil, respectively. Due to the low vapor pressure, anthracene and pyrene showed the low removal efficiency. In case the powdered activated carbon was added to the soil as a sensitizer, anthracene and pyrene were decomposed into a various by-products. Decomposition rates of anthracene and pyrene were increased with incresing addition of a PAC to the soil. It is concluded that the developement of a microwave process to remediate soils contaminated with PAHs is foreseeable. But additional studies are also needed regarding continuous microwave heating process.

  • PDF

Synchronous determination of polycyclic aromatic hydrocarbons(PAHs) in sediment of Ulsan Bay by synchronous 2nd derivative fluorescence spectrophotometry (이차 미분 형광 분광광도법에 의한 울산만 해양 저질토양 중의 다환 방향족 탄화수소(PAHs)의 동시 분석)

  • Yoo, Kwang-Sik;Jyoung, Jy-Young;Jeong, Seon-Yi
    • Analytical Science and Technology
    • /
    • v.17 no.1
    • /
    • pp.45-52
    • /
    • 2004
  • Determination of some PAHs in sediments at Ulsan bay has been carried out by extraction of the components into n-hexane followed by synchronous spectrofluorimetric technique. 11 PAHs, such as acenaphthene (Ace), anthracene (Anth), benz(a)anthracene (BaA), benzo(b)fluoranthene (BbFt), benzo(k)fluoranthene (BkFt) benzo(a)pyrene (BaP), chrysene (Chry), phenanthrene (Phen), fluoranthene(Ft), perlyrene (Per), and pyrene (Pyr) in sediment samples were able to determine separately by synchronous spectrofluorimetry. Calibration curves for those components were linear for the concentration range of 0.15~166 ppb PAHs with the correlation factor of 0.9985~0.9999. The total amount of PAHs in sediments varied from 68.8 to 324.4 ng/g. The PAHs concentration was shown a tendency to increase from the outer bay to the inner basin as well the predominant contributors to the aromatic ring groups of the PAHs was 4-ring group.

Analytical method of polycyclic aromatic hydrocarbons (PAHs) in oil contaminated soils (유류 오염토양 중 다환방향족탄화수소류(PAHs) 분석방법 고찰)

  • Yoon, Jeong Ki;Park, Jin Soo;Shin, Sun Kyoung;Kim, Tae Seung
    • Analytical Science and Technology
    • /
    • v.21 no.4
    • /
    • pp.296-303
    • /
    • 2008
  • This study was performed to establish an analytical method of PAHs in oil contaminated soil of these methods by evaluating the PAHs test methods from US EPA and ISO etc. The application to domestic contaminated soil leads to a conclusion that alumina column is a more effective clean-up procedure for oil contaminated soil rather than the others. It is proposed with the new analytical method of 12 PAHs except for more volatile compounds (naphthalene, acenaphthylene, acenaphthene, fluorene). The recovery of PAHs in this method ranged 67~107%. The oil contaminated soil samples were analyzed using GC/MSD. The concentration of PAHs ranged $78.68{\sim}275.57{\mu}g/kg$. The predominated compounds were fluoranthene, pyrene and chrysene attributing about 70% of total concentration. The level of Benzo[a]pyrene ranged $1.76{\sim}24.65{\mu}g/kg$.

Determination of Polycyclic Aromatic Hydrocarbons (PAHs) in Atmospheric Samples by Synchronous 2nd Derivate Spectrofluorimetry (동시형광 분광광도법에 의한 대기 시료 중의 다환방향족 탄화수소(PAHs)의 분석)

  • 유광식;정선이;정지영
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.20 no.1
    • /
    • pp.129-138
    • /
    • 2004
  • Determination of some PAHs in ambient air at Ulsan have been carried out by collection of the components into n-hexane followed by synchronous spectrofluorimetric technique. 10 PAHs, such as acenaphthene (Ace), anthracene (Anth), benz[a]anthracene (BaA), benzo[b]fluoranthene (BbFt), benzo[k]fluoranthene (BkFt) benzo[a]pyrene (BaP), chrysene (Chry), phenanthrene (Phen), fluoranthene (Ft), perlyrene (Per), and pyrene (Pyr) in air samples were able to determine separately by synchronous spectrofluorimetry. Calibration curves for those components were linear for the concentration range of 0.2∼166ppb PAHs with the correlation factor of 0.9985∼0.9999. The predominant contribution was phenanthrene which was included 36.9∼85.1% to the overall level of the 10 PAHs in some areas. Also benzo[a]pyrene which was known to carcinogenicity was detected from 6.4 to 55.8ng/㎥, benzo[a]anthracene of some areas was contained from 21.9∼153ng/㎥.