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Ion Exchange of Copper from Sulphate Effluent using DOWEX G-26
이재천,김민석,정진기,황택성,Nguyen, Nghiem Van,Lee, Jae-Chun,Jha, Manis Kumar,Kim, Min-Seuk,Jeong, Jin-Ki,Hwang, Taek-Sung 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.4
본 연구는 전자산업으로부터 발생하는 CMP 폐수와 유사한 $0.3{\sim}0.5mg/ml$ 구리를 함유한 조제 황산 용액으로부터 DOWEX G-26 양이온 교환 수지를 사용한 구리 회수 공정 개발에 관한 것이다. 함구리 황산 용액으로부터 구리를 회수하기 위해 용액의 pH, 수지의 사용량, 용액의 산 농도, 용액과 수지의 접촉시간 등을 변수로 다양한 조건에서의 회수 실험을 실시하였다. 평형 pH 2.5, 용액/수지의 비 100mL/g 조건에서 14분의 접촉으로 99.99%의 구리가 흡착되었다. 구리의 흡착은 Langmuir isotherm을 따랐으며, 반응치수는 2차였다. 흡착된 구리는 묽은 황산에 의해 수지로부터 효과적으로 용리되었으며, 이로부터 농축용액을 만들 수 있었다. In view of the increasing importance of the waste recycling to meet the strict environmental regulations, the present investigation reports an adsorption process using cationic exchanger DOWEX G-26 for the recovery of copper from the synthetic sulphate solutions containing copper 0.3 to 0.5 mg/ml, similar to the CMP waste effluent of electronic industry. Various process parameters viz. contact time, solution pH, resin dose, and A/R ratio for elution were investigated to recover copper from the effluents. Complete adsorption of copper from the solution was achieved at equilibrium pH 2.5 and aqueous I resin (A/R) ratio of 100 ml/g in 14 minutes contact time. The adsorption of copper on DOWEX G-26 resin was found to follow the Langmuir isotherm and second order reaction. The copper was eluted from loaded resin with dilute sulphuric acid to produce copper-enriched solution.
自動車 廢觸媒로부터 鹽酸浸出에 의한 自金族 金屬의 回收
이재천,정진기,김민석,김병수,김치권,Lee, Jae-Chun,Jeong, Jin-Ki,Kim, Min-Seuk,Kim, Byung-Su,Kim, Chi-Kwon 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.5
산화제로 질산 또는 하이포아염소산나트륨을 사용하는 염산침출에 의하여 자동차 폐촉매로부터 백금, 필라듐 및 로듐 등의 백금족 금속을 추출하는 연구를 수행하였다. 산화제의 종류 및 주입량, 반응시간, 광액농도가 백금족 금속의 추출에 미치는 영향을 조사하였다. 침출액으로부터 백금족 금속은 알루미늄을 환원제로 사용하는 세멘테이션법으로 회수하였다. 하이포아염소산나트륨을 산화제로 사용하였을 때 백금족 금속의 추출율이 더 높았으며 최적침출조건은 염산농도 8M, 하이포아염소산나트륨 첨가량 1.4mole, 침출온도 $90^{\circ}C$, 침출시간 180분, 광액농도 400 g/L 이었다. 이 조건에서 백금, 필라듐 그리고 로듐의 추출은 각각 96.1%, 93.6%, 77.3%이었다. 백금족 금속의 28당량인 2.0g의 알루미늄을 첨가하였을 때 백금, 필라듐 그리고 로듐은 각각 98%, 98.8% 그리고 65.3%가 환원되었다. The extraction of platinum group metals such as Pt, Pd and Rh from spent automobile catalyst has been investigated by leaching in HCl solutions using $HNO_3$ or NaOCl as a oxidant. The effect of type and amount of oxidant, reaction time and pulp density on the extraction of platinum group metals was examined. Platinum group metals were recovered by the cementation method using aluminum as a reducing agent. The extraction ratio was higher when NaOCl was used as a oxidant. The optimum leaching conditions were obtained to be: HCl 8 M, the amount of NaOCl 1.4 mole, leaching temperature $90^{\circ}C$, leaching time 180 minutes, pulp density 400g/L. Under the optimum conditions, the extraction of Pt, Pd and Rh were 96.1%, 93.6% and 77.3%, respectively. With the addition of 2.0g of aluminum which corresponds to 28 equivalent the reduction were 98% for Pt. 98.8% for Pd and 65.3% for Rh, respectively.
이재천,정진기,김병수,김민석,조영수,Lee Jae-chun,Jeong Jinki,Kim Byung-su,Kim Min Seuk,Cho Young Soo 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.1
백금을 함유하고 있는 폐촉매가 정유공장과 화학공장에서 발생하고 있다. 백금은 고가일 뿐만 아니라 희귀하고 뛰어난 물성으로 인하여 오래 전부터 회수대상이 되어 왔다. 본 연구에서는 알루미나로 구성된 폐촉매의 담체를 황산으로 용해하여 불용성 백금을 농축하는 방법으로 석유 폐촉매로부터 백금을 회수하고자 하였다. 황산에 일부 용해된 백금은 알루미늄을 환원제로 사용하는 세멘테 이션법으로 회수되었다. 온도, 시간, 황산농도, 광액농도 등이 담체의 용해에 미치는 영향을 조사하였다. 담체가 $\Upsilon-Al_2$$O_3$로 구성된 폐 촉매를 6.0 M $H_2$$SO_4$ 용액으로 $100^{\circ}C$에서 2시간 동안 용해하였을 때 알루미나의 용해율은 약 95% 정도이었다. 담체가 $\Upsilon-Al_2$O$_3$와 $\alpha$-$Al_2$O$_3$의 혼합물로 구성되어 있는 경우, 4시간 용해하였을 때 약 92%의 알루미나가 용해하였다. 담체를 황산으로 용해한 다음 백금을 회수하는 방법을 이용하여 석유 폐촉매로부터 99% 이상의 백금을 회수할 수 있었으며 동시에 황산알루미늄을 부산물로 얻었다. Spent catalysts containing platinum were generated in petroleum refinery and other chemical industries. The reclamation of platinum metals from such wastes has long been attempted in view of their rare, expensive and indispensable nature. In this study, the recovery of platinum from petroleum catalysts was attempted by a method consisting mainly of dissolving alumina carrier with sulfuric acid thereby concentrating insoluble platinum. Also, platinum dissolved partially in sulfuric acid was recovered by a cementation method using aluminum metal as a reductive agent. The effect of temperature, time, concentration of sulfuric acid, and pulp density on the dissolution of carrier was investigated. When the carrier of platinum catalyst was $\Upsilon-Al_2$O$_3$ about 95% alumina was dissolved in 6.0 M sulfuric acid at $100^{\circ}C$ for 2 hours. When the carrier was the mixture of $\Upsilon-Al_2$$O_3$ and $\alpha$-$Al_2$$O_3$ about 92% was dissolved after 4 hours. As a result, more than 99% of platinum could be recovered by this method and aluminum sulfate was also obtained as byproduct.
Propylthiouracil에 의한 약제 유발 루푸스
이재천 ( Jae Chun Lee ),유빈 ( Bin Yoo ),임윤정 ( Yun Jeong Lim ),김성호 ( Seong Ho Kim ),임미경 ( Mi Kyung Lim ),조유숙 ( You Sook Cho ),송영기 ( Young Kee Shong ),문희범 ( Hee Bom Moon ) 대한류마티스학회 1999 대한류마티스학회지 Vol.6 No.1
Propylthiouracil(PTU) is one of lupus-inducing drugs, though rarely reported. We report a case of PTU-induced lupus, with the review of previous literatures. Lupus-like symptoms in a 28 year-old female patient, who had been suffering from relapsed Graves` disease, were presented during PTU therapy. The results of antinuclear antibody and anti-histone antibody were positive. After symptomatic treatment and discontinuation of PTU, all of the symptoms and the abnormalities in laboratory tests disappeared, which suggested drug-induced lupus.
첩포시험을 이용한 유전자 변형 들잔디의 접촉피부염 인체위해성 검정
이재천 ( Jae Chun Lee ),선현진 ( Hyeon Jin Sun ),이효연 ( Hyo Yeon Lee ) 대한천식알레르기학회 2015 Allergy Asthma & Respiratory Disease Vol.3 No.2
Purpose: Genetic modification technique is widely used in plants for improving crop yields and qualities, and reducing pesticide use. Zoysia japonica is one of the widely planted grasses for lawning. Pollenless herbicide-tolerant genetically modified (GM) grasses (JG21-MS1 and JG21-MS2) were developed under surveillance for possible biohazard. Grasses may cause allergic contact dermatitis with direct contact on human skin. Patch testing with allergens was adopted to compare the incidences of allergic contact dermati¬tis to GM grass leaves with those of wild-type grass. Methods: Patch testing with controls and leaves of wild-type and GM grasses was performed in individuals with informed consent. Results: Ninety-seven individuals (mean age, 32±8 years; 48% males) were enrolled. For nickel sulfate as a positive control, 38 sub¬jects (39.2%) were positive. For GM grasses, 10 (10.3%) showed positive patch test results and 11 (11.3%), for wild-type grass, the proportions of which were similar among the tested grasses. Conclusion: JG21-MS1 and JG21-MS2 are not more biohazardous than wild-type grass in the risk of allergic contact dermatitis.(Allergy Asthma Respir Dis 2015;3:134-138)
이재천 ( Jae Chun Lee ) 대한천식알레르기학회 2012 천식 및 알레르기 Vol.32 No.2
The lungs are highly defensive to environmental challenges thanks to the airway mucus layer, not only as a pool of antimicrobial and antioxidant contents but also as an important part of physical barrier and mucociliary clearance. This review comprises the mechanism of airway mucus production; synthesis, exocytosis to the airway lumen and dilution of gel-forming mucins. Airway mucus consists of mainly water and mucins, highly glycosylated and condensed proteins. The mucins are produced in the mucin-secreting cells, in which interleukin-13 is one of the synthesis stimulators. Mucins are processed and maturated in the cytoplasm, and then released into the airway in two ways, constitutive and regulated. The constitutive exocytosis might be essential in maintaining normal airway mucus gel layer. The regulated exocytosis occurs mainly in the diseased airway, agonized by ATP through P2Y2 purinergic receptors. Secreted mucins are immediately hydrated through the osmotic pressure on the airway epithelium. Water and bicarbonate contents in the lumen are important factors determining the physical properties, especially the viscosity of the airway mucus. (Korean J Asthma Allergy Clin Immunol 2012;32:73-80)