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화학적으로 변형된 하수 슬러지를 이용한 반응성 염료의 생물흡착
윤영상,한민희,최기욱 한국청정기술학회 2007 청정기술 Vol.13 No.3
Biosorption is considered to be a promising alternative to replace the present methods for the treatment of dye-containing wastewater. In this study, sewage sludge was used as a biosorbent which could be one of the cheapest and most abundant biomaterials. The objective of this work is to develop a surface-modified biosorbent with enhanced sorption capacity and binding affinity. The FT-IR and potentiometric titration studies revealed that carboxyl, phosphateand amine groups played a role in binding of dye molecules. The binding sites for reactive dye Reactive Red 4 (RR 4) were identified to be amine groups present in the biomass. In this work, based on the biosorption mechanism, the performance of biosorbentcould be enhanced by the removal of inhibitory carboxyl groups from the biomass for practical application of the biosorbents. As a result, the maximum capacity of biomass was increased up to 130% and 210% of the increment of sorption capacity at pH 2 and 4, respectively. Therefore, chemically modified sewage sludge can be used as an effective and low-cost biosorbent for the removal of dyes from industrial discharges. 생물흡착은 염색폐수로부터 염료를 제거하기 위한 기술로서 현재 사용되고 있는 기술을 대체할 수 있는 유망한 처리 방법이다. 본 연구에서는 생물흡착제로써 저가이면서 풍부한 소재중의 하나인 하수 슬러지를 이용하였다. 본 연구의 목적은 바이오매스의 변형을 통하여 흡착능력을 향상시키는데 있다. FT-IR 분석과 적정실험을 통하여 흡착에 관여하는 작용기는 카르복실 그룹, 인산 그룹, 아민 그룹으로 판명하였으며 그 중에서 반응성 염료(Reactive Red 4, RR 4)를 흡착할 수 있는 작용기는 아민 그룹임을 알 수 있었다. 또한 음이온성 염료인 RR 4의 흡착을 저해하는 것으로 생각되는 카르복실 그룹을 제거함으로써 흡착성능을 향상시킬 수 있었다. 그 결과, 카르복실 그룹이 제거된 바이오매스의 최대 흡착량이 변형 전에 비해 pH 2에서는 130%, pH 4에서는 210% 증가하였다. 그러므로 화학적으로 변형시킨 하수 슬러지는 산업폐수내 염료제거에 효과적이면서 값싼 생물흡착제로 이용될 수 있을 것으로 기대된다.
Temperature-dependent Variations of the Interface between UO2 and Zr
윤영상,김종구,박순달,하영경 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8
Temperature-dependent variations of the interface between uranium dioxide and zirconium in UO2-Zr systems were studied using X-ray photoelectron spectroscopy. The surface of the uranium dioxide sample was oxidized to hyperstoichiometric UO 2+x composed of U(IV), U(V), and U(VI) valence states at room temperature, whereas UO2 consisting of the only U(IV) oxidation state appeared after annealing with zirconium. In the zirconium sample, its surface was spontaneously oxidized to ZrO2 at room temperature, whereas it was variously changed after heating the UO2 -Zr sample. Furthermore, we observed a molten product composed of α-Zr(O), (U,Zr)O2 , and ZrO2 when a UO2 -Zr sample was fully melted.
Ferritin Light Heavy Chain 유전자가 도입된 인삼형질전환체의 단일배발생을 통한 식물체의 기내증식
윤영상,양덕춘,김무성,김종학 한국자원식물학회 2004 한국자원식물학회지 Vol.17 No.2
Optimal regeneration conditions of ginseng transformants were studied. It has beenknown that Ferritin Light Heavy Chain (FLHC) gene remove the several heavy metal bycombination, store and transport. To obtain the ginseng tolerant to heavy metal, binaryvector was introduced in Agrobacteriumby tri-parental mating and then AgrobacteirumtumefaciensMP90/FLHC was selected on the AB media and MS media containingkanamycin. Explants were co-cultured with Agrobacterium tumefaciensMP90/FLHC, whichcontained NPT II as a selectable marker, tadpole ferritin heavy chain (FLHC) gene andhuman ferritin light chain gene and then a number of embryos were induced. The inducedembryo transferred to shooting media consisting of MS medium supplemented with GA 10mg/L. As a result of examination that induced the normal growth of transfomants,transformants showed the equivalent growth in both root and shoot on the media containingthe 1/3 MS.
배배양에 의한 인삼 우수계통으로부터 염류 Stress 내성 계통의 선발
윤영상,양덕춘,김무성 한국자원식물학회 2004 한국자원식물학회지 Vol.17 No.3
Selection of stress-tolerant ginseng lines in fields is very difficult because it is almostimpossible to control properly the environmental conditions of soil. On the contrary, it canbe studied with ease to search for stress-tolerant ginseng lines through in vitroculturebecause of easy manipulation of stress conditions. This study was conducted for the selectionof ginseng pure lines tolerant to salt stress. Murashige & Skoog(MS) media with 2.5 folds ofKNO3, NH4NO3, MgSO4· 7H2O, KH2PO4, and CaCl2· 2H2O was established for the selectionof ginseng pure lines tolerant to salt stress in vitro. Among 88 ginseng pure lines bred byKorea Ginseng and Tobacco Research Institute, Punggi Hwangsuk, 78093, 82886, 78135,86024 and KG104 lines was tolerant to salt stress. For the stable production of qualityKorean ginseng, genetic tolerance to salt stress is one of important factors since relativelyhigh salt concentrations in the ginseng nursery soil environment of Korea. Ginseng inbredpure lines were tested for their tolerance to salt stress through in vitroculture technique.
혼합 용매에서의 겔화/결정화에 의한 초고분자량 폴리에틸렌 필름의 역학적 성질
윤영상,조재환 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.1
Ultra-high molecular weight polyethylene (UHMWPE) films with a molecular weight of 6×10 were produced by gelation/crystallization from solution with cosolvent mixtures of decalin and p-xylene. Prior to the analysis of mechanical properties of gel films, sol-gel transition temperature was measured, being dependent on the volume fraction of mixed solvents and polymer concentration. Critical polymer concentration where there is an abrupt change in the concentration dependence of sol-gel transition temperature was higher for xylene-rich solution than for decalin-rich solution. Young's modulus and tenacity of gel films increased with the increase of draw ratio, but were not affected significantly by the volume fraction of mixed solvents. Bire-flingence of gel films increased initially with the increase of draw ratio, but reached an equilibrium value above some critical draw ratio. Critical draw ratio and equilibrium hire-flingence of gel fem for xylene-rich solution were higher than those for decalin-rich solution. Young's modulus tended to increase with the birefringence, but did not show any dominant dependence on the crystallinity.