Red Mud 및 Fly Ash 기반 지오폴리머의 물리·화학적 특성 및 응용

신진영,김한성,윤순도 한국환경기술학회 2023 한국환경기술학회지 Vol.24 No.4

Industrial waste and wastewater have a significant impact on environmental pollution. This study is to prepare industry wasted red mud (RM) and fly ash (FA)-based geopolymer adsorbents (RFGPA) with various FA/RM ratios and to investigate their physicochemical properties and adsorption abilities for methylene blue (MB). Prepared RFGPA was characterized using XRD, EDS, FT-IR, FE-SEM, and BET analysis. The adsorption ability of RFGPA with various FA/RM ratio was performed using methylene blue (MB). The adsorption equilibrium time of MB was about 72 hours. Results indicated that adsorption amount of MB on RFGPA was 3.0 times higher than that of pristine RM and FA. In addition, the adsorption ability of RFGPA was improved with the increase in FA content only up to the FA/RM ratio of 3, and then decreased. It was found that RM1FA3 was the optimal ratio for adsorption. Based on these results, the potential of utilizing hazardous industrial waste like RM and FA for eco-friendly adsorbent materials to address environmental pollution. .

Adsorption and separation properties of gallic acid imprinted polymers prepared using supercritical fluid technology

Byun, Hun-Soo,Chun, Danbi Elsevier 2017 The Journal of supercritical fluids Vol.120 No.2

<P><B>Abstract</B></P> <P>Molecularly imprinted technique is one of the methods to form specific memory sites in a polymer matrix with the template. For main objective of this work, we prepared molecularly imprinted polymers (MIPs) using supercritical fluid technique as an eco-friendly process. MIPs were synthesized using methyl methacrylate (MMA) as a third monomer, methacrylic acid (MAA) as a functional monomer, gallic acid (GA) as a template, and ethylene glycol dimethacrylate (EGDMA) as a crosslinking agent. The template was removed through the method of Soxhlet extraction, and the removal ratio was about 95–99%. The adsorption abilities of prepared MIPs was evaluated by binding kinetics, the binding isotherms, Scatchard analysis, the adsorption of materials with structures similar to templates, high performance liquid chromatography (HPLC) analysis, and the selectivity factor (a), The results of the evaluation indicate that the prepared MIPs have high separation abilities and selectivity. In addition, we identified that although there was a difference of adsorption quantities with the crosslinking agent contents (EGDMA contents), MIPs synthesized in this study had good adsorption selectivity in the presence of GA and its structure analogue materials. From this result, it could be found that the selectivity of MIPs was improved significantly by controlling the crosslinking agent.</P> <P><B>Highlights</B></P> <P> <UL> <LI> GA imprinted polymers were prepared by supercritical polymerization in CO<SUB>2</SUB>. </LI> <LI> Adsorption abilities were evaluated by the adsorption isotherm, Scatchard analysis, and selectivity. </LI> <LI> The prepared GA imprinted polymers have high separation abilities and selectivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

생물질재료에 의한 중금속 흡착에 관한 연구

정석희,감상규,이민규 한국환경과학회 1993 한국환경과학회지 Vol.2 No.4

This study was conducted for the efficient utilization of biomaterials such as starch residue, tangerine skin, and green tea residue, which are agricultral by-products discarded in Cheju Province annually, as adsorbents and biomaterials were examined for their removal ability of heavy metal ions in waste water by batch adsorption experiments. The removal efficiency of biomaterials for heavy metal ions was above 80-90% and almost similar to activated carbon and the adsorption ability of those treated with 포르말린 was improved in the green tea residue only for Pb^2+, Cu^2+, and Zn^2+. In the conditions of pH, the removal efficiency of heavy metal ions was high in the range of 5-7. In the solutions which heavy metal ions were mixed, the removal efficiency was similar at Ag^+, Pb^2+ and reduced to about 10% at the other ions, as compared with the solutions they were not mixed. Adsorption isotherms of biomaterials was generally obeyed to Freundlich formular than Langmuir formular and Freundlich constant, 1/n were obtained in the range of 0.1-0.5.

무환자 열매로부터 추출한 사포닌의 특성

양진모,하병조 대한미용학회 2019 대한미용학회지 Vol.15 No.1

Surfactants which have ability to decrease surface tension through surface activation between interfaces are used as essential materials for cosmetics. These days, there is an increase in the world-wide interest to develop new natural surfactants which are biodegradable, mildness and multi-functional new amphiphilic materials to replace the synthetic surfactants. The saponin of Sapindus mukorossi seeds was obtained via hydro-alcoholic extraction at 60℃ by stirring for 2hours. The final yield was 5.8% (w/w). The chemical structure of the saponin was determined by TGA, FT-IR, LC/MS, and 1H-NMR. The results showed that the glycones of Sapindus mukorossi are oligosaccharide and aglycones are triterpenoid. The simultaneous presence of hydrophobic triterpenoid and hydrophilic oligosaccharide imparted amphiphilic nature. By using 1% saponin solution the surface tension of water could be reduced from 72 mN/m to 38.8 mN/m. through Du Nouy ring method. Foaming ability and foam stability were measured by standard bubble generating apparatus. The Ross-miles index value was 152 mm. The maximum foam volume was 162 mm. Odor adsorption ability of 1% saponin solution for ammonia gas was estimated to be 99% removal after 120 min. This value was more than activated carbon which showed 60% removal after 120 min. In conclusion, the saponin from Sapindus mukorossi seeds showed strong potential as an ingredient of multi-functional shampoo as well as a good candidate for functional hair care products. 본 연구에서는 무환자 열매로부터 사포닌을 추출하고 그 표면활성, 기포력, 구조분석 및 암모니아에 대한 소취효과를 확인하였다. 무환자로부터 사포닌의 추출은 화장품 성분으로서 잔류용매의 문제가 없도록 물과 에탄올의 혼합 용매를 사용하여 가온 추출하여 얻을 수 있었다. 얻어진 무환자 사포닌을 계면활성제로서의 특성을 나타내어 물의 계면활성을 크게 낮추었고 우수한 거품 발생력과 거품안정도를 보였으며, 합성 계면활성제인 sodium lauryl sulfate 보다 우수한 안정도를 나타내었다. 주성분에 대한 분자량이 높게 나온 것으로 볼 때 피부에 안전할 것으로 추측되며 또한 테르페노이드에 올리고사카라이드가 다수 결합된 구조로 추정된다. 한편, 암모니아에 대한 소취효과를 측정한 결과 활성탄에 비해 우수한 결과를 나타내었으며, 이는 염색이나 퍼머 시술 후 무환자 사포닌이 함유된 모발 화장품을 사용할 겨우 높은 소취 효과로 암모니아의 냄새를 최소화할 수 있을 것이다. 결론적으로 무환자 사포닌은 향후 암모니아성 기체에 대한 우수한 소취효과로 각종 기능성 화장품의 성분으로 응용될 수 있을 것으로 여겨진다. 향후 무환자 사포닌의 소취 메커니즘과 실제 모발 세정제 제로 제조했을 때 퍼머나 염색 시술 후 모발에 잔존하는 암모니아 냄새의 제거에 대한 추가적인 연구가 필요할 것으로 사료된다.

Theoretical insight of adsorption ability in stoichiometric and oxygen-defect copper-oxide surface catalyst doped with oxophilic titanium support for facile hydrogen evolution reaction (HER)

( Muhammad Dzulfahmi Ramadhan ),김경수 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0

소나무 및 참나무 백탄의 물성과 구리(Ⅱ) 이온 흡착 효과

이오규(Oh-Kyu Lee),조태수(Tae-Su Jo) 한국산림바이오에너지학회 2006 산림바이오에너지 Vol.25 No.2

전통 방식으로 제조되어 시중에 유통 중인 2종의 참나무 백탄과 2종의 소나무 백탄에 대한 물성과 수용액 상 구리(Ⅱ) 이온 흡착 성질을 시험하였다. 물성시험 결과, 탄의 pH는 약 9.5-9.8로 시료 탄간의 차가 크지 않았다. 원소 조성에 있어서는, 4종 시료 탄의 탄소(C) 함량이 약 85-90%로 나타났으며 S사 소나무탄의 수소(H) 함량이 1.62%로 타 시료에 비해 3배가량 높았다. 4종 시료 탄의 요오드 흡착량과 비표면적 측정의 결과에서는, 소나무탄이 참나무탄 보다 높게 나타났다. 이들 시료 목탄의 수용액 내 구리(Ⅱ) 이온 흡착율 측정 시험에서는, 목탄 시료의 처리양이 늘어날수록, 처리 시간이 길수록, 그리고 pH가 높을수록 높은 구리(Ⅱ) 이온 흡착율을 나타냈다. Physicochemical properties and copper (Ⅱ) adsorption ability of two oakwood and two pinewood charcoals, which were manufactured in traditional mode and commercialized in Korea, were examined. pHs of these four wood charcoals were between 9.5 and 9.8. In the elemental contents of the wood charcoal, the contents of carbon atom (C) in the four samples were between 85-90%, while the content of hydrogen atom (H) in pinewood charcoal of the company ‘S' was 1.62% and this value was three time higher than those of other samples. For iodine adsorption and specific surface area, the pinewood charcoal sample showed higher values than those of the oakwood charcoals. In the copper (Ⅱ) ion adsorption in aqueous solution, the adsorption rate was increased by the increase of treated amounts of charcoal, treatment time, and pH.

Understanding the photophysical and surface properties of TiO₂-Al₂O₃ nanocomposites

Lee, S.W.,Paraguay-Delgado, F.,Arizabalo, R.D.,Gomez, R.,Rodriguez-Gonzalez, V. North-Holland 2013 Materials letters Vol.107 No.-

TiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposites (2-50wt% Al<SUB>2</SUB>O<SUB>3</SUB>) were synthesized by the sol-gel process, simultaneously gelling aluminum and titanium alkoxide. Focusing on surface phenomena and thermal stability of synthesized nanocomposites, this research describes the way by which alumina binds to the TiO<SUB>2</SUB> anatase phase and how the new framework modifies the photophysical and surface properties to achieve complete 2,4 Dichlorophenoxiacetic acid (2,4-D) degradation with t<SUB>½</SUB>=38.3min<SUP>-1</SUP>. The nanocomposite with 5wt% of Al<SUB>2</SUB>O<SUB>3</SUB> shows optimum textural, adsorption abilities, and photocatalytic properties.

수용액 중에서 Polyamine계 유기응집제를 이용한 중금속 이온의 흡착 : 키토산의 분자량과 탈아세틸화도 The Influence of Molecular Weight and Degree of Deacetylation of Chitosan

박영미,전동원 한국의류산업학회 2006 한국의류산업학회지 Vol.8 No.4

소리쟁이 에탄올 추출물의 항산화 활성 및 뿌리의 중금속 흡착능에 관한 연구

정갑섭(Jeong, Kap-Seop) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.2

소리쟁이 에탄올 추출물의 환원력, 전자공여능, 산화안정도 등 항산화활성과 소리쟁이 분말에 의한 수중의 Pb(II)와 Cd(II)의 흡착성능을 측정하였다. 추출액의 고형분 함량에 의한 추출율은 추출조건에 따라 1.9~3.0%로서 추 출용매비가 낮을수록, 추출온도가 높을수록 증가하였고, 환원력과 전자공여능은 용매비에 반비례하고 추출온도에 비 례하였으며, 20배의 용매비와 75℃의 온도에서 추출물의 환원력과 전자공여능은 ascorbic acid의 86.4%와 91%에 각 각 대응되었다. 옥수수 배아 식용유에 대한 추출물의 산화안정성은 실험 조건에 따라 합성 항산화제인 BHT의 86~91.3%의 성능을 보였다. 그리고 소리쟁이에 의한 중금속 흡착능은 Cd(II)보다 Pb(II)가 훨씬 높았으며, 흡착시간 60분에서 초기 농도 20ppm의 경우 Pb(II)의 흡착률은 88%이었으며, Cd(II)는 Pb(II)의 92%정도로 나타났다. Antioxidant activities such as reducing power, electron donating ability(EDA) and oxidation stability of Rumex crispus extracts with ethanol were examined, and adsorption of Pb(II) and Cd(II) with dried Rumex crispus powder in aqueous solution was experimented. Extraction yields based on the soluble solid contents ranged 1.9% to 3.0%, and were inversely proportional to solvent ratio but proportional to extraction temperature. Reducing power and EDA were also increased with extraction temperature but decreased with solvent ratio. These were corresponded to 86.4% and 91.0% of ascorbic acid reducing power and EDA, respectively, on 20 folds of solvent ratio and 75℃. Oxidation stability of Rumex crispus extracts on the corn seed oil was 86~91.3% of butylated hydroxytoluene. Pb(II) adsorptivity of Rumex crispus was higher than Cd(II), and adsorption rate of Pb(II) was 88% in 20 ppm concentration and 60min.

쇠무릎과 청미래덩굴 부위별 추출물의 이화학적 특성에 관한 연구

정갑섭(Jeong, Kap-Seop) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.7

야생생물자원의 기능성 탐색의 일환으로 쇠무릎과 청미래덩굴의 부위별 추출물에 대한 몇 가지 이화학적 특성을 비교·고찰하였다. 추출률은 증류수>메탄올>에탄올 순이었으며, 추출된 유리 아미노산은 총 16종으로서 쇠무릎 은 proline이, 청미래덩굴은 phosphoserine과 glutamic acid의 함량이 가장 높았다. 갈변도와 방향족 화합물 함량은 청 미래덩굴 잎은 메탄올 추출물이 가장 높고 에탄올, 증류수 순이었으나, 쇠무릎 잎의 경우 증류수 추출물의 흡광도가 가장 높고, 메탄올, 에탄올 순으로 나타났다. 청미래덩굴 잎과 뿌리의 전자공여능은 잎은 에탄올>메탄올>증류수, 뿌 리는 메탄올>에탄올>증류수 순이었고 쇠무릎은 증류수>에탄올>메탄올 순이었다. 올리브유에 대한 산화억제 작용은 TBA가를 기준하여 합성 항산화제인 BHT에 비해 쇠무릎 잎은 82.1%, 청미래덩굴 잎은 84.0%의 값을 보였다. 쇠무 릎 줄기의 메탄올 추출물은 Bacillus subtillis에 대해 항균력을 보였으며, 청미래덩굴 잎 추출물은 Bacillus subtillis, Vibrio vulnificus 및 Salmonella enterica에 대하여 항균력이 있었다. 그리고 중금속 이온의 흡착 및 회수실험 결과 동 일한 금속농도에서 Cd(II)에 대한 청미래덩굴의 흡착률보다 Pb(II)에 대한 쇠무릎의 흡착률이 더 높았다. Physicochemical properties of Achyranthes japonica and Smilax china extracts were investigated for the purpose of functionality research on the natural bio-resources. Extraction contents were order of distilled water>methanol>ethanol solvent, the highest free aminoacids were proline from Achyranthes japonica, phosphoserine and glutamic acid from Smilax china, respectively. BI and TAC by spectrophotometric absorbance were order of methanol>ethanol>water in Smilax china leaf extract, but water>methaol>ethanol in Achyranthes japonica leaf extract. EDA was high in ethanol extract from Smilax china leaf and in methanol extract from Smilax china root, and in water extract from Achyranthes japonica. TBA value of Achyranthes japonica leaf and Smilax china leaf-ethanol extracts on olive oil was 82.1% and 84.0%, respectively, for that of an artificial antioxidant BHT. Antimicrobial effect was observed in Achyranthes japonica stem-methanol extract on Bacillus subtillis, in Smilax china leaf-ethanol extract on Bacillus subtillis, Vibrio vulnificus and Salmonella enterica, respectively. And the adsorption of Pb(II) on Achyranthes japonica was higher than that of Cd(II) on Smilax china under the same metal ion concentration.