Surface modified granular activated carbon for enhancement of nickel adsorption from aqueous solution

변상훈,Dhamodaran Kavitha,Kanagasabai Muruganandam Ponvel,Kyung-min Kim,이창하 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6

Coal-based granular activated carbon was modified with acetates of sodium, potassium and lithium at concentrations of 10 and 15% and used as adsorbents to explore the adsorption mechanism of nickel ion in aqueous solution. Acetate treatment reduced surface area and pore volume of the activated carbons, but the adsorption amount of Ni(Ⅱ) on the modified activated carbons (MAC) was greater than that on the virgin activated carbon. The adsorption depended on pH of the solution with an optimum at 4.5 and the adsorbed nickel could be fully desorbed by using 0.05 M HCl solution. The maximum adsorption capacity of nickel ion on Li (15 wt%) modified activated carbon was 151.3 mg/g and the adsorption isotherm follows Langmuir, Sips, and Redlich-Peterson isotherm models better than the Freundlich isotherm model. The kinetic data was better fitted by a non-linear form of the pseudo-first order than the pseudo-second order, but the difference between two kinetic models was small.

부평역에서의 공기중 석면 노출 실태 및 인식도 조사

변상훈,주종순,손종렬 대한환경위생공학회 2003 대한환경위생공학회지 Vol.18 No.1

원저 : 작업환경측정제도 규제 순응 실태

변상훈,이관형,유계묵,피영규 한국산업위생학회 2009 한국산업보건학회지 Vol.19 No.3

일부 인쇄업 근로자의 유기용제 및 소음 노출에 관한 연구

변상훈,유인성,손종렬 대한환경위생공학회 1998 대한환경위생공학회지 Vol.13 No.3

일부 반면형 호흡기보호구 착용시 안면 크기 및 성별에 따른 밀착도 변화

변상훈,문경환,손종렬,김영환,배은상 高麗大學校 倂設 保健大學 保健科學硏究所 2000 保健科學論集 Vol.26 No.1

The fit of a respirator to the Face of an individual can be determined by a qualitative fit test((QLFT) or a quantitative fit test (QNFT). A quantitative fit test, was performed to evaluate leak values with Mask Fitting Tester. Two brands of half face respirators(M,S) were tested on 110 wearers on time. This study was investigated how the fit factors resulting from a quantiative fit test (QNFT) depend on the movements in the six test exersize regimes. Fit factor were low when face lengthes were higher or lower than average values. In this research we studies the koean's face length and compared the result with one of the American and the Japanese after wearing the Half-Mask Respirators, some changes in their leak were found and the results were as follows. 1. Although most testee were young, the Korean's face length were similar to the American while the male face length were similar to the Japanese. 2. For men, thier face length has been longer about by 1㎝ but mouth's length shorter about by 0.3㎝ than 10 years ago. 3. If the face length were not normality (such as higher or lower) leak degree was too high to be appropriate for the Respirator. 4. Both M and S company their respirators showed that the male leak degree was two times lower than female. Therefore, the resporators in the current market were believed to forcus it's target for male consumers. 5. The result of QLFT in a male showed that pass% of M was 20% higher than S. 6. In the result of QLFT, pass% of S was 25% highr than M in a female 7. These results(5&6) showed that S were more suitable in a female and M were more suitable in a male

국산 확산포집기를 이용한 기중 포름알데히드 농도 측정 및 평가

변상훈,임채현,손종렬 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.1

The purpose of this study is to investigate if some formaldehyde exists in DONG DAE MOON cloth or dry goods markets, and also to alalyze the function of sampler on the hypothesis that are some formaldehyde in those places. More importantly we did not use the existing method by active sampler but we used the new diffusive sampler that we made. 1. The result of this study showed that some formaldehyde existed in DONG DAE MOON cloth and dry goods markets. Average concentration of formaldehyde was 0.136ppm 2. On the basis that the ministry of labor in Korea recommended the Permissible Exposure Limit(PEL) as 0.1ppm, the value of 0.136ppm exceed the PEL. In conclusion, more many stydies about how formaldehyde effects on human body and what diseases that material cause in the body should be proceeded in addition more stydies using diffusive sampler will be needed in the future

시화공단 지역의 주요 휘발성물질 농도 분포 특성

변상훈,이정근,김정근,Byeon, Sang-Hoon,Lee, Jeong-Geun,Kim, Jeong-Keun 대한환경공학회 2010 대한환경공학회지 Vol.32 No.1

In this study, we investigated the concentrations of volatile organic compounds (VOCs) in Shiwha area and compared the characteristics of both industrial area and residential area. The passive samplers were set 6 times each for a month in 21 locations at industrial and residential area to obtain 6 VOCs including benzene, trichlorobenzene, toluene, ethyl benzene, xylene and stylene. Above all, toluene was the most abundant VOCs in the ambient air both in industrial and residential area. Average TVOC concentration of industrial area was 1.86 times higher than that of residential area, and it was greatly reduced in winter compared with summer. Furthermore, the average BTEX concentrations showed that all concentrations of industrial area were 1.94~5.39 times higher than those of residential area except benzene which were similar to each other. In winter, the concentration of ethyl benzene and xylene were significantly decreased by comparing with summer: but benzene concentrations were increased. Also, BTEX relative ratio was as follows: toluene>benzene>ethylbenzene>xylene. Correlation coefficients among VOCs were confirmed that VOCs in ambient air of industrial area were generally more related to each other than that of residential area. On the whole, the concentrations of VOCs in industrial area were higher, and it seems to be potential that industrial area affects the distribution of VOCs to residential area.

건조기술 산업현장 VOCs 의 포집에 있어 습도의 영향

변상훈,류영기 한국화학공학회 1997 화학공업과 기술 Vol.15 No.5

N/A N/A

아파트 실내에서 시간 경과에 따른 포름알데히드의 농도 조사

변상훈,김영환,손종렬,문경환 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.1

Our communities have been exposed to polluted air. Polluted air could cause the serious injury such as respirational impediment, disease and so on, and the air pollution could be most serious problem in our life. Unfortunately, we didn't have consider these problems seriously, and we had make no solutions for these problems. The new apartment was shown higher concentrations for formaldehyde than the old apartment, that indicated the new apartment environment was more polluted.

확산 포집기를 이용한 공기중 유기용제 측정에 관한 연구

변상훈 高麗大學校 倂設 保健大學 保健科學硏究所 1997 保健科學論集 Vol.23 No.1

The laboratory and field tests for air monitoring of ethylacetate and toluene were carried by passive sampling methods and compared the results with using charcoal tubes. The results were as follows; 1. The mean desorption efficiencies of A, B passive monitors were over 85%. Those of B passive monitor for ethylacetate, however, had been increased to 17.5% by using the agitator for desorption. 2. The capacities of A, B passive monitor which had been exposed at the 2×STD for 8 hours were increased linearly with time increasing. So, A, B passive monitor were more suitable than charcoal tubes at long time exposure level. 3. As for the back diffusion, A passive monitors showed 8.4% concentration difference for ethylacetate and 5.0% for toluene and B passive monitors showed 1.2% for ethylacetate and 1.3% for toluene, respectively. Both of A, B passive monitors showed less than 10% difference. 4. As for the face velocity, A passive monitor showed less than 10% difference between high and low face velocity. But B passive monitors showed 12.7% difference between high and low velocity. So, they seemed to be affected by face velocity. 5. The uptake difference between low and high humidity showed very low values which were 0.8-3.3% for EAc and 0.1-0.2% for toluene. 6. The precision and accuracy for A, B passive monitors were also checked. The coefficients of variance for A B passive monitors were 2.3-4.0% for A passive monitors and 5.5-9.0% for B passive monitors. Overall accuracies for A passive monitors were ±14.2-14.8% and ±18.5-19.9% for B passive monitors. Overall accuracies for them were below 25% at the 95% confidence level. 7. The results of air monitoring by using passive monitors for ethylacetate and toluene were compared with the results of using charcoal tubes in gravers printing plants. The correlation between charcoal tubes and passive monitors were evaluated as Y=1.76X+37(r=0.81, p<0.05) for ethylacetate and Y=1.36X-49(r=0.93, p<0.06) for toluene.