• Carbon letters
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• 제8권4호
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• pp.280-284
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• 2007

Samples of active carbon of $1150\;m^2/g$ surface area were impregnated with ammoniacal salts of copper, chromium and silver, with and without triethylenediamine. The samples of impregnated carbon were aged at $50^{\circ}C$, with and without 90% RH (relative humidity), for a little more than one year and chemically evaluated periodically. Initially copper (II) and chromium (VI) reduced very fast in the samples in humid atmosphere to the extent of 30% and 60% respectively in four months. These values were found to be unaffected by the presence of triethylenediamine (TEDA) indicating that the chemical did not retard the reduction process of chromium (VI) and copper (II). However, in the absence of humidity the reduction of the impregnants was significantly less (10-12%, w/w) in four months. It was quite evident; therefore, that the moisture was mainly responsible for the reduction of chromium (VI) and copper (II) species in impregnated carbons. The prolonged ageing of the samples with and without triethylenediamme after four months with and without humid atmosphere showed that the extent of reduction of chromium (VI) was very low, i.e. 5-10% and of copper (II) was 2-25%. Silver is not reduced due to carbon, as it remained unchanged in concentration on storage. The impregnated carbon samples (100 g) without triethylenediamine, which were aged at room temperature for 5 years in absence of humidity and unaged when evaluated against cyanogen chloride (CNCl) at a concentration of 4 mg/L and airflow rate of 30 lpm showed a high degree of protection (80- 110 minutes).

• 대한환경공학회지
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• 제28권4호
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• pp.384-388
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• 2006

본 연구는 극성 및 독성물질에 대한 활성탄의 흡착력을 향상시키기 위하여, 활성탄을 산 처리 후 활성탄 50 g에 0.1 M $FeSO_4{\cdot}7H_2O,\;CuSO_4{\cdot}5H_2O,\;AgNO_3$ 용액을 300 mL 첨가하여 jar tester를 이용하여 60 rpm의 속도로 1시간 교반시켜 철, 은, 구리 이온을 첨착하였다. 금속 첨착과정으로 제조한 금속 첨착활성탄의 표면 성상 및 화학적 특성을 규명하기 위하여 비표면적, 세공용적 및 분포, 주사현미경 촬영, 흡착등온 등의 실험을 하였다. 산 처리 활성탄에 철, 구리, 은을 첨착할 경우 미세세공이 중간세공과 거대세공으로 전환되어 금속 첨착량이 약 1.3배 정도 증가하였고 금속 첨착활성탄내에서 미세세공에 의한 물리적 흡착과 침착된 금속 이온에 의한 화학적 흡착이 동시에 가능하였다.

• 문화기술의 융합
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• 제9권6호
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• pp.855-859
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• 2023

질산구리삼수화물염(copper(II) nitrate trihydrate) 수용액을 공업용 전분(starch)에 함침 시킨 전구체를 이용하여 산화구리(CuO) 나노 입자를 합성하였다. 주사전자현미경(SEM)을 통하여 질산구리삼수화물염 수용액이 함침된 전구체에 대한 구조를 분석하였고, 전구체에 대한 열처리 온도를 증가 시킴에 따라 생성되는 산화구리 입자의 입자 크기와 결정 구조를 X선회절분석법(XRD)과 주사전자현미경(SEM)으로 분석하였다. 분석 결과에 따르면, 전구체에서 유기물질이 완전히 열분해 되어지는 온도는 450-490℃이며, 열처리하는 온도가 증가함에 따라 생성되는 산화구리 입자의 크기와 결정성이 증가하는 것을 확인할 수 있었고, 또한 500-800℃에서 1시간씩 열처리하여 얻은 산화구리 입자의 크기는 100nm-2㎛인 것으로 나타났다. 하소 온도 400℃에서 산화구리 결정상이 형성되고, 800℃까지는 산화구리 단일상만 존재하며, 하소 온도의 증가에 따라 생성되는 입자의 크기가 커지는 것을 확인하였다.

• Carbon letters
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• 제5권4호
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• pp.180-185
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• 2004

Thermolysis of $Cu(NO_3)_2{\cdot}3H_2O$ impregnated activated carbon fiber (ACF) was studied by means of XRD analysis to obtain Cu-impregnated ACF. $Cu(NO_3)_2{\cdot}3H_2O$ was converted into $Cu_2O$ around $230^{\circ}C$. The $Cu_2O$ was reduced to Cu at $400^{\circ}C$, resulting in ACF-C(Cu). Some Cu particles have a tendency to aggregate through the heat treatment, resulting in the ununiform distribution in ACF. Catalytic decomposition of NO gas has been performed by Cu-impregnated ACF in a column reactor at $400^{\circ}C$. Initial NO concentration was 1300 ppm diluted in helium gas. NO gas was effectively decomposed by 5~10 wt% Cu-impregnated ACF at $400^{\circ}C$. The concentration of NO was maintained less than 200 ppm for 6 hours in this system. The ACF-C(Cu) deoxidized NO to $N_2$ and was reduced to ACF-$C(Cu_2O)$ in the initial stage. The ACF-$C(Cu_2O)$ also deoxidized NO to $N_2$ and reduced to ACF-C(CuO). This ACF-C(CuO) was converted again into ACF-C(Cu) by heating. There was no consumption of ACF in mass during thermolysis and catalytic decomposition of NO to $N_2$ by copper. The catalytic decomposition was accelerated with increase of the reaction temperature.

• 동력기계공학회지
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• 제14권4호
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• pp.50-55
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• 2010

In order to investigate tribological effects of nano copper particles impregnated(CuN) on surface polytetrafluoroethylene(PTFE) on sealing wear and an experimental study was carried out to determine the wear behavior of copper nano-particles impregnation two kind thickness in super critical $CO_2$ liquid. Experimental results showed that the friction coefficients of CuN PTFE at the low sliding speed(0.44m/s) and the oil temperature ($60^{\circ}C$) were higher than that of virgin PTFE. And a thin nano copper particles impreganated thickness was formed on the surface in the PTFE and the specimen with this treatment has much better friction properties than the original one. Fortunately, at the high load(80 N) and the oil temperature, the friction coefficient of CuN PTFE was lower than that of virgin PTFE. This evidenced the load carrying capacity of CuN PTFE was much better than that of virgin PTFE under the high load condition(80 N) specially. Therefore, it can be concluded that the friction coefficient variation of CuN PTFE is very small but its wear rate decreases greatly with increase in sliding speed.

• 대한환경공학회지
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• 제28권2호
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• pp.178-182
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• 2006

오존으로 상수처리시 생성되는 소독부산물로써 독성이 강한 브롬산염을 철, 구리, 은 첨착활성탄을 이용하여 제거할 목적으로 회분식과 연속식으로 실험하였다. 활성탄 주입량별 브롬산염 제거 실험에서 각각의 활성탄을 0.1, 0.3, 0.5, 1.0 g씩 주입하여 240분 반응시킨 결과 브롬산염의 제거량은 주입량에 비례하였다. 그리고 산 처리한 활성탄을 사용할 때에는 브롬산염 제거 효율이 약 20%정도 증대되었다. 철, 구리, 은 첨착활성탄은 일반 활성탄보다 약 $30{\sim}50%$ 정도 제거 효율이 좋았으며 특히 철 첨착활성탄은 브롬산염을 약 92%제거하였다. 일반 활성탄을 이용하여 브롬산염을 제거하였을 경우 약 $0.02{\sim}0.45mg\;{BrO_3}^-/g$ AC이였지만 철, 구리, 은 첨착활성탄은 약 $0.9{\sim}1.5mg\;{BrO_3}^-/g$이었다. 연속식 칼럼 반응에서 브롬산염 유입량을 $15.6{\sim}46.8mL/min$으로 변화시켜 EBCT를 1, 2, 3 분으로 실험한 결과 96, 180, 252 시간에서 파과 현상을 보였다.

• 대한환경공학회지
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• 제38권3호
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• pp.144-149
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• 2016

대나무를 원료로 탄화 및 활성화 온도 $900^{\circ}C$에서 대나무 활성탄을 만들고, 이 대나무 활성탄에 금속 구리와 금속 은을 담지시켜 금속 담지 대나무 활성탄을 제조하였다. 제조된 금속 담지 활성탄의 비표면적 및 세공분포 등의 물리적 특성을 분석하였다. 또한 폐 대나무 활성탄의 재활용을 위하여 대나무활성탄과 NO 기체의 반응 특성 실험을 열중량분석기를 사용하여 반응 온도 $20{\sim}850^{\circ}C$, NO 농도 0.1~1.8 kPa 변화 조건에서 하였다. 실험 결과, 대나무 활성탄 특성 분석에서 구리 담지 대나무 활성탄에서는 구리 담지량이 증가할수록 세공 부피와 표면적이 감소하였다. 비등온과 등온 NO 반응에서는 전체적으로 구리 담지 대나무 활성탄[BA(Cu)]이 대나무 활성탄[BA]에 비하여 반응속도가 향상되는 것을 볼 수 있었다. 그러나 은 담지 대나무 활성탄[BA(Ag)]은 반응이 억제되는 것을 볼 수 있었다. NO 반응에서의 활성화에너지는 80.5 kJ/mol[BA], 48.5 kJ/mol[BA(Cu)], 66.4 kJ/mol[BA(Ag)]로 나타났고, NO 분압에 대한 반응차수는 0.63[BA], 0.92[BA(Cu)]이었다.

• 한국가스학회지
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• 제27권1호
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• pp.78-85
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• 2023

구리가 함침된 하이드로탈사이트 촉매의 고유 키네틱 데이터를 이용하여 메탄올 수증기 개질 반응의 고정층 반응기 Computational Fluid Dynamics(CFD) 시뮬레이션을 수행하였다. 이전 연구결과로부터 얻어진 20wt%의 구리가 함침된 하이드로탈사이트 촉매의 활성화 에너지는 97.4 kJ/mol, 전 지수 인자는 5.904 × 10¹⁰를 이용하였다. 그리고 고유의 키네틱 데이터를 사용하여 반응온도 (200-450 ℃) 및 메탄올과 물의 몰비 변화에 따른 전환율을 관찰하였다. 또한 위의 키네틱 상수를 power law 모델을 사용하여 Axial 2D Symmetry 시뮬레이션을 통해 상용반응기(I.D. 0.05 - 0.1 m, Length 1 m)의 열 및 물질유동해석을 예측하였다.

• Journal of the Korean Wood Science and Technology
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• 제25권4호
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• pp.92-98
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• 1997

To make good use of chitosan forming complex with heavy metals in wood preservative treatment, woods impregnated with chitosan and copper sulfate were prepared. Amounts of leached copper, decay resistance, anti-mold efficacy, iron corrosion rates, moisture regain rates and degradation pattern in chitosan pre-treated and untreated wood were compared. After leaching test, amounts of leached copper from chitosan pre-treated wood had a much smaller than chitosan untreated wood, and good decay resistance was retained even after leaching test. From these results, it was proved that chitosan-copper complex formed in wood played and important role for decay durability. In chitosan pre-treated wood, damage values by test molds became remarkably smaller, but the growth of test molds was not perfectly inhibited. Distinct differences in iron corrosion rates between chitosan pre-treated and untreated woods was not recognized but chitosan pre-treated wood showed the lower moisture regain rates than chitosan untreated wood because of water insoluble chitosan membrane formed in wood. After leaching test, the tracheid walls in the wood treated with 2.0% copper sulfate only were eroded by the fungal attacks, but those in the wood pre-treated with chitosan remained almost intact.

• 한국대기환경학회지
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• 제20권2호
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• pp.185-193
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• 2004

A catalyst with CuO ceramic filter for simultaneous treatment of dust and HAP was prepared and characterized. Catalytic ceramic filter can not only potentially achieve the substantial savings in energy but provide with effective optimization and integration of process for simultaneous removal of SO$_2$, NO$_{x}$ and particulates from flue gases. Catalytic ceramic filters remove simultaneously particulates on exterior surface of filters and reduce NO to $N_2$ and $H_2O$ by SCR (Selective Catalytic Reduction) process. Preparation of catalyst impregnated ceramic filter with disk shape (Ψ 50) follow the processing of alumino-silicate ceramic filter, support impregnation and catalyst impregnation (copper oxide). Preparation routes of alumino-silicate catalyst carrier suitable for production of catalytic filters practically were studied and developed using the sol-gel and colloidal processing, homogeneous precipitation and impregnation method. Characterization of the catalyst, catalyst carrier catalytic filter materials have been performed the using various techniques such as BET, XRD, TGA, SEM. Combination of the sol-gel and colloidal processing and impregnation method is recommended to prepare catalyst carriers economically for catalytic filter applications.s.