• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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• pp.175-176
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• 2004

To develope of efficient method for decontaminating of lead ions from industrial wastewater, treatment of aqueous lead solution with magnetic beads was investigated. Immobilization of carboxyl groups on tile surface of magnetic beads was carried out to introduce chelate effect between lead ions and beads. Experiments were performed with lead solutions and magnetic beads at pH 6. Lead ions were extracted during 1 hour, After extraction, magnetic beads were separated from water by outer magnetic force and the solution was analysed by atomic absorption spectroscopy (AAS). Over 90 % of lead ions could be removed from aqueous solution after beads application. This result indicate that magnetic beads can be used as a efficient method for removing lead ions from industrial wastewater.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2003년도 International Symposium on Clean Environment
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• pp.208-211
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• 2003

Characteristics of biosorption of lead by marine algae, Laminaria japonica, were examined. The biosorption capacity of lead by L. japonica was achieved up to 30％ of its own weight and proportional to the initial lead concentration. However, the opposite result was shown in different initial weight of biomass. Ion exchange reaction between lead ions and calcium ions was observed on lead biosorption with Ca-Ioaded biomass. Stoichiometric coefficient, which can represent the exchange ratio between metal ions and protons during elution process, was determined as 1.39. Therefore, it was concluded that the reaction between lead ions already attached in biomass and protons in bulk solution was not fully stoichiometric ion exchange relation at elution process.

• 한국환경과학회지
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• 제32권11호
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• pp.757-765
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• 2023

Lead, a heavy metal widely employed in various industries, continues to pose a threat to both human health and the environment. Therefore, the development of a sensor capable of rapidly and accurately detecting lead(II) ions in real-time at contaminated sites is crucial. In this study, we have engineered a fluorescent sensor with the ability to efficiently detect lead(II) ions under actual environmental conditions, including tap water and freshwater. The compound, tetraphenylethylene carboxylic acid derivative (TPE-COOH), exhibits high selectivity and sensitivity toward lead(II) ions in aqueous solution, where the interaction between TPE-COOH and lead(II) ions leads to its aggregation, thus triggering a fluorescence "turn-on" based on the aggregation-induced emission (AIE) mechanism. Impressively, compound TPE-COOH proficiently detects lead(II) ions within a range of 30 to 100 𝜇M in tap water and freshwater, even in the presence of various interfering substances.

• 한국세라믹학회지
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• 제48권1호
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• pp.20-25
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• 2011

Since 1980's, many mines have been closed and abandoned due to the exhaustion of deposits and declining prices of international mineral resources. Because of the lack of post management for these abandoned mines, Farm land and rivers were contaminated with heavy metal ions and sludge. We studied on the solidification/stabilization of heavy metal ions, chromium ions and lead ions, using magnesia-phosphate cement. Magnesia binders were used calcined-magnesia and dead-burned magnesia. Test specimens were prepared by mixing magnesia binder with chromium ions and lead ions and activators. We analyzed the hydrates by reaction between magnesiaphosphate cement and each heavy metal ions by XRD and SEM-EDAX, and analyzed the content of heavy metal ions in the eruption water from the specimens for the solidification and stabilization of heavy metal ions by ICP. The results was shown that calcined magnesia binder is effective in stabilization for chromium ions and dead-burned magnesia binder is effective in stabilization for lead ions.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVI)
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• pp.252-256
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• 2005

3종의 생물흡착제에 대하여 5가지 중금속 이온 용액의 pH가 $4{\sim}8$일 때 크롬이온은 흡착이 감소하였고 구리이온은 흡착이 증가하였으며, 특정한 실험환경(pH4, $21^{\circ}C$, 120RPM교반)에서 교반시간이 60분일 때 흡착평형이 이루어졌으며 최대흡착율에 도달하였으며, Langmuir흡착 등온식이 Freundlich 흡착 등온식보다 더 높은 상관계수를 나타내며 단일-혼합 중금속 흡착 실험에서 카드뮴과 망간을 제외하고는 모두 80%이상, 납에서 95%의 흡착성능을 보였다.

• 유기물자원화
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• 제15권2호
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• pp.81-88
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• 2007

톱밥을 이용한 중금속 제거에 관한 연구가 수행되어졌다. 납, 구리, 카드뮴 이온들 중에서 납의 흡착능이 pH 4에서 0.22 mmol/g-dry mass로서 가장 높았다. 톱밥의 표면상태와 납이온의 존재 여부는 FT-IR, SEM(Scanning Electron Microscopy) 그리고, EDX(Energy Dispersive X-ray)에 의해서 확인되어졌다. 초기 납 농도가 100ppm일때 0.5g의 톱밥으로 약 90%의 납 이온을 제거할 수 있었다. Langmuir model 식을 이용하여 납 이온에 대한 등온흡착선을 묘사하였으며 실험결과는 모델식에서 얻어진 결과와 잘 부합되었다. 또한 대부분의 흡착은 60분 내에 이루어졌으며 납 이온 용액의 pH는 5.8에서 4.5로 시간에 따라 감소하였다.

• Journal of Microbiology and Biotechnology
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• 제11권5호
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• pp.781-787
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• 2001

The binding of heavy metals by a biosorbent with binary functional groups was mathematically modeled. An FT-IR spectrophotometer analysis was employed to determine the stoichiometry between the protons in the functional groups of alginic acid and lead ions as a model system. The results calculated using an equilibrium constant agreed well with the experimental results obtained under various operating conditions, such as pH and metal ion concentration. It was also shown that the overall adsorption phenomenon of alginic acid was mainly due to its carboxyl groups. The equilibrium constants for each functional group successfully predicted the lead adsorption of ${\alpha}$-cellulose. Furthermore, the biosorption model could predict the adsorption phenomena of two metal ions, lead ions and calcium ions, relatively.

• 공업화학
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• 제24권4호
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• pp.428-432
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• 2013

충북의 산림지역에서는 목재의 가지치기에 의하여 다량의 폐목재가 발생되고 있으나, 이러한 폐목재들은 부산물로서 특정한 처리가 이루어지지 않고 있다. 본 실험에서는 폐목재(참나무, 향나무, 낙엽송, 소나무) 중에서 납 이온의 제거능력이 효과적인 생물흡착제로서 향나무를 도출하였다. 또한, 폐향나무를 사용하여 수중에 함유된 납의 제거 효율을 고찰하였다. 20 mg/L 납 이온의 제거 효율을 증가시키기 위한 최적의 초기 pH가 4임을 알 수 있었으며, 50 mg/L 납이온 제거를 향상을 위한 최적의 생물흡착제 주입농도가 0.6 g/100 mL임을 구하였다. 또한, 100 mg/L 이상의 고농도 납 이온의 흡착 능력을 향상시키기 위해서는 향나무의 황산 처리에 의한 화학적 개질 반응이 필요함을 알 수 있었다. 그리고 6 M 황산으로 개질된 향나무를 이용하여 200, 400, 500 mg/L의 납을 처리하였을 때, 납의 흡착량은 각각 180, 340, 425 mg/g를 나타내었다. 이러한 실험 결과들은 수중에 함유된 납 이온을 효과적으로 처리하는 실질적인 생물흡착제기술로 사용될 수 있을 것이다.

• 유기물자원화
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• 제15권4호
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• pp.107-114
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• 2007

다당류의 일종인 알긴산을 이용한 중금속 제거에 관한 연구가 수행되어졌다. 알긴산은 pH 4에서 480mg/g의 납 이온을 흡착하였으며 이것은 다른 생물흡착제에 비해서 약 2배 정도의 높은 흡착능이다. 납 이온에 대한 등온흡착선을 묘사하기 위하여 Langmuir model 식을 이용하였으며 실험결괴는 모델식에서 얻어진 결과와 잘 부합되었다. 온도가 증가함에 따라서 흡착능은 증가하였으며 이는 알긴산과 납 이온의 흡착은 흡열반응임을 보여준다. 납 이온의 흡착에 대한 알칼리 금속(칼슘, 마그네슘 이온)의 영향은 거의 없었으며 대부분의 흡착은 30분 내에 이루어졌다. 구리, 수은, 스트론튬, 세슘 과 같은 다른 금속 이온에 대한 흡착능도 조사되었다.

• Toxicological Research
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• 제24권3호
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• pp.227-233
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• 2008

To detect lead ions using electrochemical voltammetric analysis, Infrared Photo-Diode Electrode(IPDE) was applied via cyclic and square wave stripping voltammetry. Lead ions were deposited at 0.5 V(versus Ag/AgCl) accumulation potential. Instrumental measurements systems were made based on a simple and compact detection system. The stripping voltammetric and cyclic voltammetric optimal parameters were searched. The results yielded a cyclic range of $40{\sim}240mgl^{-1}$ Pb(II) and a square wave stripping working range of $0.5{\sim}5.00mgl^{-1}$ Pb(II). The relative standard deviation at 2 and 4 $mgl^{-1}$ Pb(II) was 0.04% and 0.02%(n=15), respectively, using the stripping voltammetric conditions. The detection limit was found to be 0.05 $mgl^{-1}$ with a 40 sec preconcentration time. Analytical interference ions were also evaluated. The proposed method was applied to determine lead ions in various samples.