• Title/Summary/Keyword: Freundlich isotherm

Search Result 176, Processing Time 0.134 seconds

Lead Biosorption by Biosorbent Materials of Marine Brown Algae U. pinnatifida, H. fusiformis, and S. fulvellum

  • LEE Mingyu;KAM Sangkyu;LEE Donghwan
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.30 no.6
    • /
    • pp.936-943
    • /
    • 1997
  • Biosorbents of nonliving, dried marine brown algae Undaria pinnatifida, Hizikia fusiformis, and Sargassum fulvellum were investigated for their lead biosorption performances. As the amount of biosorbent added was increased, the lead removal by biosorbent materials increased but the lead biosorption capacities decreased. However the lead biosorption capacity by the biosorbent materials increased with increasing initial lead concentration and pH in the range of $C_o\;10\~500\;mg/L$. Among the biosorbent materials used in this study, the lead biosorption capacity in the solutions with no pH adjustment decreased in the following sequence: U. pinnatifida > H. fusiformis > S. fulvellum. Equilibrium parameters based on Langmuir and Freundlich isotherm were determined. It was found that the lead biosorption by biosorbent materials were expressed by the Langmuir isotherm better than the Freundlich isotherm.

  • PDF

Determination of Adsorption Isotherm Parameters by Breakthrough Curves in Activated Carbon and Zeolite 13X Packed Bed (활성탄 및 제올라이트 13X를 충진한 흡착탑에서 파과곡선을 이용한 흡착등온식 상수의 결정)

  • Kang, Sung-Won;Min, Byung-Hoon;Suh, Sung-Sup
    • Applied Chemistry for Engineering
    • /
    • v.16 no.1
    • /
    • pp.131-138
    • /
    • 2005
  • Freundlich isotherms and Toth isotherms were obtained for benzene adsorption on activated carbon and zeolite 13X in static experiments. Breakthrough curves of benzene were measured in adsorption bed packed with the same adsorbents. Relation between breakthrough times and partial pressure of benzene was analyzed and the Freundlich isotherm parameters were determined. Adsorption amount of benzene predicted by the analysis of breakthrough experimental results was relatively consistent with that predicted by the static experimental results. Dynamic experiments for activated carbon bed, where more symmetric breakthrough curves were obtained, produced smaller errors with zeolite bed.

A Study on Control of Trichloroethyene by Soil bed (토양상에 의한 Trichloroethyene처리에 관한 연구)

  • 이혜령;고경숙;임경택
    • Journal of Environmental Health Sciences
    • /
    • v.24 no.3
    • /
    • pp.41-47
    • /
    • 1998
  • The purpose of this research is evaluation of adsorption capacity of the cast for TCE comparing with the yellow clay. Furthermore, the experimental data was fitted with the Langmuir and Freundlich isotherm and was found to be apllicable to the adsorption isotherm equation. The soil bed reactor used in this study was made of glass(10 cm in diameter, 100 cm in depth). The cast and yellow clay used as adsorbents were screened with 8-20 mesh mecanically. Results from Equilibrium test with adsorbents showed that the equibrium time of the cast and yellow clay was 9min independent of the amount of the adsorbents. The adsorption efficiencys of the cast and yellow clay for TCE was 66.3% and 56.2%, respectively. In the application of Freundlich isotherm, 1/n of the cast and yellow clay were 0.786 and 0.704, respectively. These results showed that the cast was more available than the yellow clay as TCE adsorbent. The best adsorption capacity was showed at 0% moisture content, 70 ppm inlet concentration and 25$^{\circ}$C temperature.

  • PDF

Characteristics of Lead Biosorption by Biosorbents of Marine Brown Algae (해양 갈조류를 생물흡착제로 이용한 납흡착 특성 연구)

  • 이민규;서정대
    • Journal of Environmental Science International
    • /
    • v.6 no.5
    • /
    • pp.531-539
    • /
    • 1997
  • Lead sorption performances by biomass of nonliving, dried marine brown algae Undaria phnaunda, Hlzikia hsyormls. and Sugassum fulvellum used as biosorbent materials were investigated. As the amount of biosorbent materials added was increased, the lead removal by biosorbent materials Increased but the lead biosorption capacities decreased. However, with increasing Initial lead concentration the lead biosorption capacities by the biosorbent materials Increased but lead removal efficiencies decreased. In the range of Initial lead concentration(Co) 10-500 mg/L the lead biosorption capacities and removal efficiencies by the biosorbent materials Increased with increasing pH. Among the biosorbent materials used in this study, the lead biosorption capacities decreased in the following sequence: U. plilnaunda > H. fusiformis > S. fulvellum. The lead biosorption by biosorbent materials were expressed by the Langmuir Isotherm better than the Freundlich Isotherm. The biosorption rate could be expressed by the first order reaction rate equation for initial lead concentration like that rad : 0.288Co for U. phanda, rad = 0.255Co for H. fusiformis, and rad : 0.161Co for S. fulvellum. Key words : Lead, biosorption, biosorbent, Undaria pinnatinda, Hiztkia fusiformis, Sargassum fulvellum, Langmuir isotherm, Freundlich isotherm, biosorption rate.

  • PDF

매립지 잔류토사에서 DEHP의 흡착특성에 관한 연구

  • Jeong In-Ho;Lee Jae-Yeong;O Byeong-Taek
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • /
    • pp.143-148
    • /
    • 2005
  • Plastics and vinyl resin is generally used in the various fields of industry and daily life. Except incineration, most waste has been disposed finally in landfill and the leaching of plasticizer as DEHP(di 2-ethylhexyl phthalaet) has been taken place in the landfill. DEHP had been found. for endocrine disrupter by World Wild Life Fund and Japan. In this study aimed at estimation of capacity of adsorption and measurement of phthalate ester in the residual soil. The residual soil had been gathered from three closed landfill which was under stabilization with sorting and transferring. The Dibutyl phthalate and DEHP had been contained in all residual soil. Especially, resisual soil contained DEHP much more than peripheral soil. In J landfill residual soil, organic matter content, CEC and #200 sieve passing ratio is highest, and Freundlich isotherm sorption coefficient(K) and constant(1/n) is highest.

  • PDF

Adsorption of Heavy Metals by the Mixture of Macbansuk and Clay (맥반석과 점토로 성형한 흡착제에 의한 수중의 중금속 흡착)

  • 연익준;김광렬
    • Journal of environmental and Sanitary engineering
    • /
    • v.14 no.4
    • /
    • pp.150-157
    • /
    • 1999
  • According to the fact that Macbansuk and clay are very porous, we produced combined adsorbent and we investigated the removing capacity of adsorbent to toxic heavy metal (Pb, Cu) in the single and mixed solution.Then the experimental parametars were pH, reaction time and amount of adsorbent. And we studied possibility of adsorbent by applying to the Freundlich isotherm. As raising the pH of single and mixed solution in range 2~5, the maximum adsorption capability was investigated in range 3~4. When Cu and Pb were applied to Freundlich isotherm, l/n were 0.291 and 0.513 respectively. In the case of mixed solution with both, l/n value was 0.614. In this study, we concluded that the combined adsorbent treated toxic heavy metal is possible under 100 ppm of its concentration.

  • PDF

Adsorption Removal of Odor Compounds (IBMP, IPMP) (이.취미물질(IBMP, IPMP)의 흡착제거)

  • 김은호;손희정;김영웅
    • Journal of environmental and Sanitary engineering
    • /
    • v.14 no.2
    • /
    • pp.18-24
    • /
    • 1999
  • The purpose of this study was carried out to estimate removal possibility of IBMP and IPMP causing odor in raw water. As a result of Freundlich isotherm. IBMP was superior to IPMP in adsorptive capacity. Adsorptive capacities of activated carbon were found to be in order of Lignite, Coconut shell, and Charcoal. These were well fitted with Freundlich isotherm. According to adsorption breakthrough tests for Lignite GAC, breakthrough time of IPMP and IBMP were 5.7hr and 5.5hr, respectively. Because adsorptive capacities of target material were very different with pore size distribution, it seemed that Lignite and Coconut shell based activated carbons were recommended in order to remove door compounds.

  • PDF

농약류 (1,2-dichlorobenzene, hexachlorocyclohexane)의 토양 흡착 특성 규명

  • 정현정;이민희;도원홍
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • /
    • pp.338-341
    • /
    • 2003
  • 유기염소계 농약 중 대표적인 살충제 $\delta$-BHC(hexachlorocyclohexane)와 1, 2-DCB (1, 2-dichlorobenzene)에 대한 논, 밭 토양 및 풍화 토에 흡착 배치실험을 통하여 토양 특성과 유기오염물간의 흡착 관계를 규명하였다. 13개의 토양시료에 대하여 pH, CEC, 유기물 함량, 비표면적, 입도분석, 원소조성분석을 통하여 토양의 물리ㆍ화학적 특징이 토양 흡착에 미치는 영향을 규명하고자 하였다. 유기염소계 농약의 흡착량을 Freundlich isotherm으로 나타내어 흡착분배계수(K$_{d}$)를 산출하였다. $\delta$-BHC는 유기물 함량이 높은 soil-4$_{d}$에서 가장 높은 $K_{d}$ 값을 보였으며, 1,2-DCB의 경우 CEC, 비표면적이 가장 낮은 soil-5에서 낮은 $K_{d}$ 값을 보여 토양 내 유기물 함량과 비표면적이 유기오염물 흡착량에 중요한 요소로 작용함을 알 수 있었다.

  • PDF

Biosorption of Heavy Metal lons by Biomass of Marine Brown Algae in Cheju using Their Immobilization Techniques: Biosorption of Copper by Undaria pinnatifida

  • Kam Sang-Kyu;Lee Min-Gyu
    • Environmental Sciences Bulletin of The Korean Environmental Sciences Society
    • /
    • v.1 no.2
    • /
    • pp.157-166
    • /
    • 1997
  • The biosorption performances of copper were investigated by the immobilized biomass of nonliving marine brown algae Undaria pinnatifida by each of the Ca-alginate method(Ca-ALG), Ba-alginate method(Ba-ALG), polyethylene glycol method(PEG), and carrageenan method (CARR). The copper removal performance increased but the copper uptake decreased as the biomass amount was increased. However, the copper uptake by the immobilized biomass increased with increasing initial copper concentration. Among the immobilization methods, the copper uptake decreased in the following sequence: Ca-ALG > Ba-ALG > PEG > CARR. The pattern of copper uptake by the immobilized biomass fitted the Langmuir isotherm better than the Freundlich isotherm. Desorption of deposited copper with 0.05 ~0.5M HCI, resulted in no changes of the copper uptake capacity of the immobilized biomass by the immobilization methods except for PEG, through five subsequent biosorption/desorption cycles. There was no damage to the immobilized biomass which retained its macroscopic appearance in repeated copper uptake/elution cycles.

  • PDF