• 한국환경과학회지
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• 제7권6호
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• pp.803-809
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• 1998

Heavy metal ions in water were removed using algal biomass as adsorbents. Absorbents were dried for 3 days, ground them by 40~60 mesh and then were swelled in a buffer solution for 1hr. After being packed in the column, commercially available standard solution of Cd(II) and Pb(II) ions were diluted to get the suitable concentration and then it was eluted with the rate of 1mι/min. Heavy metals on the adsorbents were recovered with nitric acid. More amounts of Cd(II) or Pb(II) ions in green algae, Ulva pertusa, than in brown algae, Sargassum horneri, were adsorbed. Pb(II) ion was adsorbed more than Cd(II) ion in both algae. The pH effect of adsorbed amounts of Cd(II), Pb(II) ions on the biomass was shown the following order ; pH 10.5 ＞ 8.5 ＞ 7.0 ＞ 5.5 ＞ 3.5. Recovery ratio of metal ions front algae is shown higher in acidic or neutral conditions than it in alkalic ones. Pb(II) ion is recovered relatively more than Cd(II) ion in our system.

• 한국안전학회지
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• 제19권3호
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• pp.57-64
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• 2004

This is the study for the removal of a toxic heavy metal ions and the recycling of expanded polystyrene wastes. Thus expanded polystyrene wastes collected from the packing materials of TV or chemicals and dissolved by $80wt.\%$ solvent(N, N-Dimethylacrylamide), electrospun in DC 20kV by power supply. Generally, the electrospinning is a process of manufacture to the fibers of nanosize from polymer solution. Manufactured nanofiber mats by electrospinning were sulfonated by cone.-sulphuric acid with $Ag_2S_O_4$ catalysts for the exchange capacity of heavy metal ions and the properties of structure with sulfonated time investigated by FESEM(Feild Emission Scaning Electron Microscope). The ion exchange capacity of light metal$(Na^+)$, Cd(II) and Ni(II), and by a nanofiber mats were 1.94[mmo1/g-dry-mat), 1.72(mmol/g-dry-mat), 1.24(mmol/g-dry-mat), respectively., and water uptake content showed a similar trend with IEC. and The selectivity coefficients $K^M_H$ of Cd(II), Ni((II) ions showed 0.324, 0.228. respectively.

• 한국토양비료학회지
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• 제28권2호
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• pp.114-122
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• 1995

토양유기물(土壤有機物)에 의한 중금속(重金屬)의 흡착(吸着)현상을 구명(究明)하기 위하여 이탄토(泥炭土)에서 humic acid를 분리정제(分離精製)하여, humid acid-metal complex 생성반응(生成反應)에 대한 mechanism을 조사(調査)하였다. 1. Humic acid-metal complex의 흡광도(吸光度)는 장파장영역(長波長領域)에서 단파장영역(短波長領域)으로 갈수록 Zn-HA > Cd-HA > Cu-HA의 순(順)으로 증가(增加)하였다. 2. Humic acid의 carboxyl group과 phenolic OH group들이 중금속(重金屬) ion들과 반응(反應)하여 complex를 생성(生成)하였으며 그 생성량(生成量)은 Cu > Zn ≧ Cd의 순(順)이었다. 3. Humic acid-medal complex의 안정도(安定度) 상수(常數)는 pH가 증가(增加)함에 따라 增加하였으며 1차(次) 안정도(安定度) 상수(常數)는 Zn>Cd>Cu 순(順)이었고, 2차(次) 안정도(安定度) 상수(常數)는 Cu>Zn>Cd의 순(順)이었으며, 總安定도 常數는 Cu>Zn>Cd의 순(順)이었다. 4. Humlc acid와 중금속(重金屬)ion들 상호(相互) 간(間)의 평균결합수(平均結合數)는 pH가 증가(增加)함에 따라 Cu>Zn>Cd의 順으고 增加하였다. 5. Humic acid에 의한 중금속(重金屬) ion들의 complex생성과정(生成課程)에서 barboxyl group만이 관여(關與)하는 것과 car-boxyl gruup 및 phenolic OH group이 동시(同時)에 관여(關與)하는 두가지 흡착(吸着)mechanlsm을 제안할 수 있었다.

• 멤브레인
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• 제27권2호
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• pp.129-137
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• 2017

본 연구에서는 수계 내 포함된 양이온들 중 특히 중금속 이온을 효율적으로 분리할 수 있는 양이온 교환막을 개발하였다. 기저 고분자로는 sulfonated polyetheretherketone (SPEEK)를 사용하였으며 이에 중금속 이온에 결합력이 강한 킬레이팅 수지를 파우더링하여 첨가하였다. 또한 양이온 교환막의 성능을 최적화시키기 위해 킬레이팅 수지의 함량 및 SPEEK의 이온교환용량을 제어하였다. 결과적으로 제조된 양이온 교환막을 막 축전식 탈염 공정(membrane capacitive deionization, MCDI)에 적용한 결과 중금속 이온 제거 효율이 20% 이상 향상됨을 확인할 수 있었다.

• 대한화학회지
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• 제29권2호
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• pp.164-171
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• 1985

SAF 축합중합체와 CHBM-DVB 공중합체를 합성하였다. 이들 합성된 이온교환체의 이온교환용량은 각각, 4.6meq/g and 3.9 meq/g이었다. 또한 이들 약산성 이온교환체에 대한 몇가지 금속이온들의 흡착능과 이온교환체 성질에 대하여 논의하였다. 그리고 이온들의 염산용액중에서의 분포계수와 몇가지 용리현상에 대하여 논의하였다.

• 한국환경농학회지
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• 제16권2호
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• pp.142-148
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• 1997

중금속오염폐수처리에의 미생물 이용 가능성을 검토하기 위하여 중금속에 강한 내성을 지님과 동시에 균체내 중금속 축적능력이 우수한 중금속 내성균을 분리하여 competing ion, 대사저해제 등과 같은 외부 요인에 따른 균체내 중금속 축적변화를 조사한 결과는 다음과 같다. 중금속을 처리한 용액중 양이온인 $Al^{3+}$이온과 음이온인 $CO_3\;^{2-}$ 및 $PO_4\;^{2-}$이온이 competing ion으로 존재할 경우 중금속 내성균의 균체내 중금속 축적은 크게 감소되었으나, 그외 다른 양이온들과 음이온들에 대해서는 거의 영향을 받지 않았다. Cd, Zn 및 Cu 내성균주의 Cd, Zn 및 Cu 축적은 대사저해제에 의하여 크게 감소되었으나, Pb 내성균주에 의한 Pb 축적은 거의 영향을 받지 않는 것으로 나타나 Cd, Zn 및 Cu 내성균주의 Cd, Zn 및 Cu 축적은 에너지 의존적인 과정으로서 물질대사와 관련되어 있는 것으로 생각되었으며, Pb 내성균주의 Pb 축적은 에너지 비의존적인 과정으로서 물질대사와 관련이 별로 없는 물리적인 과정에 의하여 축적되는 것으로 생각되었다. 각 중금속 내성균주들은 해당 중금속 축적능력에 비하여 낮았으나 타 중금속들의 축적능력도 있었으며, 여러가지 중금속들을 동일 농도로 복합처리 하였을 경우 해당 중금속들의 축적능력이 타 중금속들에 비하여 매우 높게 나타나 각 중금속 내성균주들의 해당 중금속 축적은 선택적인 과정에 의하여 축적되는 것으로 생각되었다.

• Carbon letters
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• 제4권1호
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• pp.21-23
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• 2003

In this work, the effect of anodic oxidation treatment on Cr(VI) ion adsorption behaviors of activated carbon fibers (ACFs) was investigated. The aqueous solutions of 10 wt% $H_3PO_4$ and $NH_4OH$ were used for acidic and basic electrolytes, respectively. Surface characteristics and textural properties of ACFs were determined by XPS and $N_2$ adsorption at 77 K. The heavy metal adsorption of ACFs was conducted by ICP. As a result, the adsorption amount of the anodized ACFs was improved in order of B-ACFs > A-ACFs > pristine-ACFs. In case of the anodized treated ACFs, the specific surface area was decreased due to the pore blocking or pore destroying by acidic electrolyte. However, the anodic oxidation led to an increase of the Cr(VI) adsorption, which can be attributed to an increase of oxygen-containing functional groups, such as, carboxylic, lactonic, and phenolic groups. It was clearly found that the Cr(VI) adsorption was largely influenced by the surface functional groups, in spite of the reduced specific surface area of the ACFs.

• Bulletin of the Korean Chemical Society
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• 제30권8호
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• pp.1881-1883
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• 2009

• 한국환경과학회지
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• 제8권3호
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• pp.399-409
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• 1999

The three domestic natural zeolites(Yong dong-ri (Y), Daesin-ri (D), Seogdong-ri (S)) harvested in Kyeongju-shi and Pohang-shi, Kyungsangbug-Do, were pretreatd with each of the NaOH, $Ca(OH)_2$ and NaOH following HCl solutions, and the removal performances of divalent haevy metals(Cu, Mn, Pb, and Sr) for natural and pretreated zeolites were investigated and compared in the single and mixed solutions. The natural zeolite-heavy metal system attained the final equilibrium plateau within 20 min, irrespective of initial heavy metal concentration. The heavy metal uptakes increased with increasing initial heavy metal concentration and pH. The heavy metal uptakes for natural zeolites decreased in the following sequences : D>Y>S among the natural zeolites; Pb>Cu>Sr>Mn among the heavy metals. The pretreated zeolites showed higher heavy metal removal performances than natural zeolites and decreased in the order of NaOH, NaOH following HCl, $Ca(OH)_2$ treatment among the pretreatment methods. The heavy metal ion exchange capacity by natural and pretreated zeolites was described either by Freundlich equation or Langmuir equation, but it followed the former better than the latter. The heavy metal uptakes for natural zeolites decreased in the mixed solution, in comparing with those in the single solution and especially, the manganese uptake decreased greatly in the mixed solution. The pretreated zeolites showed the improved removal performances of heavy metals in the mixed solution than in the single solution and the heavy metal uptakes by those in the mixed solution showed the same trends in the single solution among the chemical treatment methods and heavy metals.

• 한국안전학회지
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• 제18권4호
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• pp.92-97
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• 2003

The purpose of this study is heavy metal absorption of recycled PET(poly ethylene terephatalate) NWF(non woven faric). The results of test are summarized as follows; Heavy metal abworption rates in Ni ions were higher then Zn and Cu ions, whereas heavy metal absorption rates by sulfonation times were not different. The heavy metal absorption times have a higher tendency from 60 min to 120 min. There were significant negative correlations among the amount used CSA(Chloro Sulfuric Acid) and the amount of absorption Zn(r = -0.33784, p < 0.05), Cu(r = -0.61177, p < 0.01) ions, whereas correlations between heavy metal absorption rates and sulfonation times were not significant. There were significant positive correlations among the amount of absorption Zn ions and the amount of absorption Ni(r = 96475, p < 0.014), Cu(r = 0.51614, p < 0.01) ions, likewise the positive correlations between the amount of absorption N ions and the amount of absorption Cu(r = 0.54766) ions were significant(p < 0.01).