First Record of Ulva torta (Ulvales, Chlorophyta) in Korea

안재우,남기완 한국환경생물학회 2017 환경생물 : 환경생물학회지 Vol.35 No.3

A marine ulvalean species (Chlorophyta) was collected from Imgok, which is located on the eastern coast of Korea. This species is morphologically characterized by distromatic, filiform to strap compressed or tubular thallus. Many branches were found near the base, but lacked proliferations. Cells were longitudinally aligned in the younger part of the branch and were disordered in the older part of the branch. A cap-like parietal chloroplast with one or two pyrenoids was contained in each cell. In a phylogenetic tree based on ITS and rbcL sequences, this species was nested in the same clade as Ulva torta and U. clathratioides from Australia, but formed a sister clade to U. torta from Japan. However, the genetic divergence between them was included in an intraspecific variation range within Ulva. This finding suggests that U. clathratioides should be reduced to a synonym of U. torta. Accordingly, the Korean alga was identified as U. torta based on the morphological and molecular data. This investigation is the first record of U. torta in the Korean marine algal flora.

廢電子스크랩에서 Thiobacillus ferrooxidans를 이용한 Cu, Al, Zn, Ni, Co, Sn 및 Pb의 浸出

안재우,김명운,정진기,이재천,김동진,안종관,Ahn, Jae-Woo,Kim, Myeong-Woon,Jeong, Jin-Ki,Lee, Jae-Chun,Kim, Dong-Gin,Ahn, Jong-Gwan 한국자원리싸이클링학회 2005 자원리싸이클링 Vol.14 No.1

In order to recover valuable metals from the waste electronic scrap, bioleaching of Cu, Zn, Al, Co, Ni, Sn and Pb was carried out using Thiobacillus ferrooxidans as a leaching microorganism in a shaking flask. In a preliminary study, to obtain the data on the leaching of Cu, Zn, Al, Co and Ni, the metal leaching was accomplished using metal powers instead of electronic scrap. The leaching percentaga of Cu, Zn, Co, Al and Ni powers was reduced with the increase of metal power concentration in solution. Below the metal concentration of 0.5 g/L, more than 85% of Cu, Co and Zn powers was leached out. At the electronic scrap concentration of 100 g/L, Thiobacillus ferrooxidans were able to leach more than 90% of the available Cu and Co while Al, Zn and Ni were able to leach less than 40%. Pb and Sn were not detected in the leachate. Pb was precipitated as PbSO$_4$, whereas Sn precipitated probably as SnO.

PCB 질산에칭액으로부터 질산과 유가금속의 회수

安在우,安鐘寬,李晩承 대한금속·재료학회 2002 대한금속·재료학회지 Vol.40 No.1

Di-n-Hexyl Sulfide 함유 지지액막을 통한 팔라듐의 투과 특성

안재우,정진기,이재천 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9

The transport of palladium through supported liquid membranes from hydrochloric acid solution has been investigated. Di-n-Hexyl Sulfide(DHS) has been stuided as a mobile carrier for the facilitated transport of Pd(Ⅱ) and kerosene as a diluent. Ammonium hydroxide solution has been employed as a stripping agents. The transport behavior of Pd(Ⅱ) was studied at various factors such as concentration of hydrochloric acid in feed solution, ammonium hydroxide in stripping solution, DHS in membrane phase, palladium in feed solution and the effect of stirring speed. The separation of palladium from palladium-platinum mixed solutions has also been investigated.

황산동용액(黃酸銅溶液)에서 Aminophosphosphonic acid 관능기를 가진 이온교환수지에 의한 As, Sb, Bi 제거(除去)에 관한 연구(硏究)

안재우,서재성,Ahn, Jae-Woo,Seo, Jae-Seong 한국자원리싸이클링학회 2012 자원리싸이클링 Vol.21 No.5

A comparative study has been carried out on the removal of impurities such As, Sb, Bi from the copper sulfate solution by ion exchange resin containing aminophosphosphonic acid as functional group. The various parameters which affect the removal of impurities; such as the reaction temperature, the reaction time, the amount of ion-exchange resins, the concentration of sulfuric acid in electrolyte, were studied. The basic experimental results showed that about 88% of Sb & 94% of Bi can be adsorbed in these chelate resins and removed from the copper sulfate solutions but As was removed below 10% from the solutions. And the selective elution of Bi and Sb from the adsorbed ion exchange resin also can be achieved by $H_2SO_4$ or HCl solutions. The results also showed that 98.1% of Sb and 96.6% of Bi can be adsorbed from the copper sulfate solutions after 2 Bed-volume of continuous ion exchange column test.

염산에칭폐액으로부터 Alamine336에 의한 구리의 용매추출에 관한 연구

안재우,염재웅 한국자원리싸이클링학회 1997 자원리싸이클링 Vol.6 No.3

A study has been made of the rccovery of copper (11) by solvent extraction with Alamine336 (Tri-n-oclylamine) as a extractant from hydrochloric etching solutions. The effect of extractant concentrations, hydrochloric acid, chloride Ion concentrations and phase ratio (organiclaqueaus) on copper extraction were studied. Experimental results showed that the concenl~atiano f extractant and the phase ratio strongly influenced the copper extraction, and the extraction percent of capper Increased at higher hydrochloric acid and chloride ion mncmhation. We proposed that the optimum extrachon stages of copper for continuous extraction process by analysidng thc McCabe-Thielc diagram. Stripping of copper from the loaded organic phases wn be accomplished by pure water (H, O) as a dripping reagent effectively. As the tcmpcrature is increased, thc stripping of copper is enhanced.

곰팡이균(Aspergillus niger)을 이용(利用)한 전자스크랩중 유가금속(有價金屬)의 미생물(微生物) 침출(浸出) 연구(硏究)

안재우,정진기,이재춘,김동진,Ahn, Jae-Woo,Jeong, Jin-Ki,Lee, Jae-Chun,Kim, Dong-Gin 한국자원리싸이클링학회 2005 자원리싸이클링 Vol.14 No.5

폐전자스크랩에서 유가금속을 회수하기 위하여 곰팡이균으로 Aspergillus niger를 이용한 Cu, Zn, Al, Co, Ni, Fe, Sn, Pb의 침출 거동을 조사하였다. Aspergillus niger는 전자스크랩의 존재 하에 배양이 가능하였고 신진대사 작용에 의해 유기산(구연산 및 옥살산)을 생성함으로써 폐전자스크랩에서 각 금속들을 침출시키는 것을 알 수 있었다. 예비실험으로 먼저 구연산 및 옥살산을 이용한 화학침출 실험으로부터 Cu, Zn, Al, Co, Fe, Sn, Pb의 침출거동을 조사하였다. Aspergillus niger를 이용한 미생물 침출 실험의 결과 전자스크랩의 농도가 50g/L인 경우 Cu 및 Co의 침출율은 95%이상이었고, Al, Zn, Pb 및 Sn의 경우는 15-35%의 침출율을 나타냈으며 Ni 및 Fe의 경우는 10%이하의 침출율을 보였다.

황산(黃酸) 침출용액(浸出溶液)에서 Cyanex272, PC88A 및 Alamine336을 이용한 바나듐(V) 및 티타늄(Ti)의 용매추출(溶媒抽出)

안재우,안종관,김주엽,유정근,이상훈,김동진,Ahn, Jae-Woo,Ahn, Jong-Gwan,Kim, Ju-Yup,Yu, Jeong-Guen,Lee, Sang-Hun,Kim, Dong-Jin 한국자원리싸이클링학회 2007 자원리싸이클링 Vol.16 No.3

A comparative study of the extraction behavior of vanadium and titanium in sulphate solutions using Cyanex272, PC88A and Alamine336 has been carried out. effect of pH in sulphate solutions, concentration of extractant and extraction isotherms has been studied. Solvent extraction separation studies of vanadium and titanium from the mixed solutions were also carried out in order to obtain a criterion for choosing the more effective extraction regent. From the experimental results, it was conformed that Alamine336 was good extractant to extraction of vanadium and separation from titanium from the mixed solutions.

New Record of Two Derbesia Species (Chlorophyta) in Korea

안재우,강필준,남기완 한국환경생물학회 2018 환경생물 : 환경생물학회지 Vol.36 No.2

Two siphonous green algae were collected from the eastern coast of Korea. These species share the typical features of Derbesia sporophytes, such as erect and prostrate siphonous filaments and the presence of basal septum in lateral branches. One is characterized by the combined features of a relatively small tufted sporophytic thalli arising from a rhizoidal base, subdichotomously branched filaments with a basal septum and one pyrenoid per subspherical to lenticular chloroplast. The other shows a larger sporophytic thallus, sparsely subdichotomously branched filaments with a basal septum and one pyrenoid per spherical chloroplast. In a phylogenetic tree based on rbcL sequence, the two above-mentioned Korean algae nest in the same clades as Derbesia minima and D. indica, respectively. The genetic distance between the sequences within the clades was 0.5-0.8%, which is considered to be included in the intra-specific range for the genus. These two siphonous Korean algae are identified as D. minima and D. indica, respectively, based on the morphological and molecular analyses. These species are newly recorded in the Korean marine algal flora herein.

전자(電子)스크랩에서 구리 및 주석의 회수(回收)를 위한 질산(窒酸) 침출(浸出) 및 침출액(浸出液)에서 유리질산(遊離窒酸) 제거(除去) 연구(硏究)

안재우,서재성,Ahn, Jae-Woo,Seo, Jae-Seong 한국자원리싸이클링학회 2009 자원리싸이클링 Vol.18 No.5

Fundamental study has been made on the recovery of copper from the electronic scrap by hydrometallurgical process. Nitric acid was used as a leaching agent to dissolve the metals such as Cu, Sn, Pb, Fe etc. from the crushed electronic scraps. TBP was employed to extract nitric acid from the strong nitric acid leaching solutions and to reclaim nitric acid. From the experimental results, Cu was effectively leached by 3.0-4.0 M nitric acid. And 95% of nitric acid in the leaching solution was extracted by 60% TBP, and 98% of nitric acid was stripped from the loaded organic phase by distilled water and it was possible to reuse as a leaching agent.