• Title/Summary/Keyword: 첨착 활성탄

Search Result 36, Processing Time 0.027 seconds

H2S Adsorption Characteristics of KOH Impregnated Activated Carbons (KOH 첨착 활성탄에서 황화수소의 흡착 특성)

  • Choi, Do-Young;Jang, Seong-Cheol;Gong, Gyeong-Tack;Ahn, Byoung-Sung;Choi, Dae-Ki
    • Applied Chemistry for Engineering
    • /
    • v.17 no.3
    • /
    • pp.280-285
    • /
    • 2006
  • Adsorption characteristics of $H_{2}S$ on KOH impregnated activated carbon were evaluated using dynamic adsorption method in a fixed bed. The pore properties, including BET's specific surface area, pore volume, pore size distribution, and mean pore diameter of these KOH impregnated activated carbons, were characterized from $N_{2}$ adsorption/desorption isotherms. Adsorption equilibrium data were correlated with Langmuir and Freundlich isotherms. The adsorption of $H_{2}S$ onto the KOH impregnated activated carbon is better fitted by the Langmuir isotherm. An increase in the content of oxygen affects the performance of KOH impregnated activated carbon to the greatest extent.

Adsorption Capacity of H2S on the Impregnated Activated Carbon with NaOH (NaOH 첨착활성탄의 H2S 흡착능)

  • Lee, Suk-Ki;Park, Yeong-Seong
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.22 no.5
    • /
    • pp.879-886
    • /
    • 2000
  • $H_2S$ adsorption characteristics of activated carbon adsorbent impregnated with NaOH were investigated. The concentrations of NaOH reagent were 1~8N and the particle size of activated carbon was $8{\times}30$ mesh. The experimental results showed that the BET surface area decreases from $1050m^2/g$ to $783m^2/g$ and acidity of activated carbon decreases from 0.541 meq/g-AC to 0 meq/g-AC, while pH increases from 9.56 to 10.86 when the impregnation ratio increases from 0.87% to 5.8%. It was also found that the $H_2S$ adsorption equilibrium capacity of activated carbon impregnated with NaOH increases with increasing temperature and $H_2S$ concentration and varies in the range of 17.87~30.34 mg/g-AC at adsorption temperature of $45^{\circ}C$, which is 2~3 times larger than that of pure activated carbon.

  • PDF

Removals of Formaldehyde by Silver Nano Particles Attached on the Surface of Activated Carbon (나노 은입자가 첨착된 활성탄의 포름알데히드 제거특성)

  • Shin, Seung-Kyu;Kang, Jeong-Hee;Song, Ji-Hyeon
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.32 no.10
    • /
    • pp.936-941
    • /
    • 2010
  • This study was conducted to investigate formaldehyde removals by silver nano-particles attached on the surface of granular activated carbon (Ag-AC) and to compare the results to those obtained with ordinary activated carbon (AC). The BET analysis showed that the overall surface area and the fraction of micropores (less than $20{\AA}$ diameter) of the Ag-AC were significantly decreased because the silver particles blocked the small pores on the surface of the Ag-AC. The formaldehyde removal capacity of the Ag-AC determined using the Freundlich isotherm was higher than that of AC. Despite the decreased BET surface area and micropore volume, the Ag-AC had the increased removal capacity for formaldehyde, presumably due to catalytic oxidation by silver nano-particles. In contrast, the adsorption intensity of the Ag-AC, estimated by 1/n in the Freundlich isotherm equation, was similar to that of the ordinary AC, indicating that the surface modification using silver nano-particles did not affect the adsorption characteristics of AC. In a column experiment, the Ag-AC also showed a longer breakthrough time than that of the AC. Simulation results using the homogeneous surface diffusion model (HSDM) were well fitted to the breakthrough curve of formaldehyde for the ordinary AC, but the predictions showed substantial deviations from the experimental data for the Ag-AC. The discrepancy was due to the catalytic oxidation of silver nano-particles that was not incorporated in the HSDM. Consequently, a new numerical model that takes the catalytic oxidation into accounts needs to be developed to predict the combined oxidation and adsorption process more accurately.

Study of Anti-bacterial Properties for Impregnated Activated Carbon by Silver Nano-particles (은나노 입자가 첨착된 활성탄의 항균특성에 관한 연구)

  • Lee, Chul-Jae;Kim, Dong-Yeub;Kim, Byung-So
    • Applied Chemistry for Engineering
    • /
    • v.18 no.4
    • /
    • pp.396-399
    • /
    • 2007
  • In present work, the anti-bacterial effect of silver/activated carbon (Ag/C) composites prepared by the ${\gamma}$-irradiation of $AgNO_3$ solution on Escherichia coli (E. coli) has been studied. Characteristics of the Ag/C composites were identified by scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic absorption spectroscopy (AAS). The inhibitory concentration of E. coli was found to be 0.387 ppm and the sterilizing concentration for the tested organism was 1.017 ppm. These results support the evidence that Ag/C composites have strong antibacterial activity to E. coli.

$H_2S$ Adsorption Characteristics and Property Analyses of Activated Carbon Adsorbent Impregnated with Basic Solutions (염기성용액으로 첨착시킨 활성탄의 물성분석 및 $H_2S$ 흡착특성)

  • Lee, Suk-Ki;Yim, Chang-Sun;Park, Yeong-Seong
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.32 no.11
    • /
    • pp.1011-1016
    • /
    • 2010
  • The $H_2S$ adsorption characteristics and property analyses of granular activated carbon adsorbent impregnated with basic solution such as NaOH, KOH, and $(CH_2CH_2OH)_2NH$ were investigated. The concentrations of NaOH and KOH reagent ranged over 1 to 5 M, The concentration of $(CH_2CH_2OH)_2NH$ was in the range of 0.1 to 1 M. Adsorption temperature($25{\sim}45^{\circ}C$) and adsorbate ($H_2S$) concentration (18.23 mg/L) were applied. The experimental results showed that the BET surface area of activated carbon impregnated with KOH decreases from $1,050\;m^2/g$ to $750\;m^2/g$, and the acidity of activated carbon impregnated with NaOH decreases from 0.541 meq/g-AC to 0 meq/g-AC, as the concentration of basic solution increases, while the pH of impregnated activated carbon increased from 9.54 to 10.94 for three basic solutions. It was also found that the $H_2S$ adsorption equilibrium capacity of activated carbon impregnated with NaOH, KOH, $(CH_2CH_2OH)_2NH$ increased with increasing temperature and $H_2S$ adsorption equilibrium capacity of the activated carbon impregnated with diethanolamine was much higher than other cases. At adsorption temperature of $45^{\circ}C$, the $H_2S$ adsorption equilibrium capacity of impregnated activated carbon was 2.0~3.3 times lager than that of pure activated carbon.

Adsorption of Cesium from an Aqueous Solution Using Activated Carbon Impregnated with triethylenediamine (TEDA) (Triethylenediamine (TEDA)로 첨착된 활성탄소를 이용한 수용액에서 세슘의 흡착)

  • Jong-Soo Choi;Suk Soon Choi;Choong Jeon;Tae-Young Jeong;Jeong Hyub Ha;Jae-Hoon Lee
    • Journal of the Korea Organic Resources Recycling Association
    • /
    • v.31 no.3
    • /
    • pp.65-71
    • /
    • 2023
  • Cesium discharged from nuclear power plants requires technology for safely treating, due to its harmfulness to the human body. In this work, activated carbon impregnated with triethylenediamine (TEDA) process was applied to effectively remove cesium dissolved in aqueous solution. The surfaces on the activated carbon were chemically modified with various TEDA concentrations (2.5, 5.0, 7.5, 10.0, and 12.5%) and the optimal TEDA concentration was obtained to be 5.0% by the assessment for cesium removal efficiency. In addition, when 5.0% TEDA-impregnated activated carbon was used to treat 5.0 and 10.0 mg/L of cesium, the removal efficiency was 71.5% and 61.1%, respectively. Also, it was found to be the chemical adsorption from the adsorption kinetics experiment by temperature change. A novel remediation technology developed in this study could be practically employed for removing cesium contained in surface and ground water.