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Thermogravimetric characteristics and pyrolysis kinetics of Giheung Respia sewage sludge
Mohd Roslee Othman,김승수,Young-Hun Park,Thanh An Ngo,김진수,Kwang Seok Lee 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
Sewage sludge acquired from Giheung Respia treatment facility was characterized and converted into gas,bio-oil and char by pyrolysis. The rate of conversion as a function of temperature was obtained from differential thermogravimetric analysis (DTG) for different heating rates. The activation energy calculated from data selected conversions shows that the activation energy decreased with increasing conversion up to 10%, steadily increased from 10 to 70%, and substantially increased from 70 to 90%. Depending on the level of conversion, the values of activation energies varied between 181 and 659 kJ/mol. The gas product obtained in the experiment at 450 oC, 20 min mainly included CO2 (30%), CO (23%) and CH4 (17%). The product yields of gas, oil and char were systematically studied by changing the pyrolysis temperature and residence time.
Research Trend on ZIF-8 Membranes for Propylene Separation
김진수,Mohd Roslee Othman 한국막학회 2019 멤브레인 Vol.29 No.2
High purity propylene (propene) is an octane-enhancing chemical and also feedstock to industrially important chemicals. Purification of propylene from propane mixture is technologically and financially challenging because of their close boiling points. ZIF-8 membrane has been increasingly researched due to its great potential to separate propylene from propane effectively by molecular sieving. The increasing interest in ZIF-8 membranes lies in the so called “gate opening” effect. The gate opening effect enlarges the membrane pores and preferentially allows propylene to permeate through the membrane pores, while retaining the larger and heavier propane molecules in the feed stream in order to effect high propylene separation from propylene/propane mixture. In this paper, the widely accepted methods of ZIF-8 membrane preparation and parameters affecting propylene permeation and selectivity in ZIF-8 membrane are identified and reviewed.
Bio-ETBE determination in a mixture of gasoline using low level liquid scintillation counting
김승수,임영관,최재형,김진수,Mohd Roslee Othman 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
There is a growing interest in Korean government to add bio-ethyl tert-butyl ether (bio-ETBE) in suboctanegasoline to reduce dependence on fossil fuel based transportation gasoline. The development ofbio-ETBE analysis method is an urgent issue to protect illegal circulation of synthetic ETBE becausesynthetic ETBE and bio-ETBE are chemically indistinguishable even by using chromatography andconventional spectroscopy. This paper communicates the results of bio-ETBE determination fromgasoline cocktail using low level liquid scintillation counting (LSC). The counts per minute (CPM) valueincreased linearly with the concentration of bio-ETBE, showing the correlation coefficient of 0.984.
Highly selective micro-porous ZIF-8 membranes prepared by rapid electrospray deposition
Vı´ctor Manuel Aceituno Melgar,안호원,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Highly selective ZIF-8 membranes were successfully prepared by electrospray deposition for H2/CO2separation. This novel method produced ZIF-8membranes in a facile and time-efficientmanner using anelectrostatic force-assisted coating approach. In addition, the membrane thickness could be controlledeasily by simply varying the deposition time. Results from the experiment indicate that the membraneperformed preeminently in comparison with previously reported glassy and polymeric membranes forH2/CO2 separation. The H2 permeance of the ZIF-8 membrane prepared at 70 8C for 55.71 min was4.23 10 7 mol m 2 s 1 Pa 1 with H2/CO2 selectivity of 20.3.
Tran, Nguyen Tien,Kim, Jinsoo,Othman, Mohd Roslee Elsevier 2019 Microporous and mesoporous materials Vol.285 No.-
<P><B>Abstract</B></P> <P>Microporous ZIF-8 membrane has great potential to separate propylene from propane effectively by molecular sieving due to the theoretical ZIF-8 aperture of 0.4 nm, which lies in between the kinetic diameter of propylene (0.4 nm) and propane (0.43 nm). In this work, defect free ZIF-8 membranes were successfully developed from the secondary growth seeding technique with sodium formate as deprotonating agent that facilitated a continuous, well-intergrown ZIF-8 crystal layer on α-Al<SUB>2</SUB>O<SUB>3</SUB> support. The defects formed by the crack formation in the membrane were steadily removed by the uniquely discovered rapid recrystallization property. The ZIF-8 membranes demonstrated excellent molecular sieve separation capability for equal molar propylene/propane mixture with the highest separation factor of 115 and average propylene permeance of 50.40 × 10<SUP>−10</SUP> mol/m<SUP>2</SUP> s Pa.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Association between Trace Element and Heavy Metal Levels in Hair and Nail with Prostate Cancer
Karimi, Golgis,Shahar, Suzana,Homayouni, Nasim,Rajikan, Roslee,Bakar, Nor Faizah Abu,Othman, Mohd Sham Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.9
While associations between trace elements and heavy metals with prostate cancer are still debatable, they have been considered as risk factors for prostate cancer. Thus, this study aimed to detect any links between selected minerals and heavy metals including Se, Zn, Cu, Mn and Fe with prostate cancer. A case control study was carried out among 100 subjects (case n=50, control n=50), matched for age and ethnicity. Trace elements and heavy metals level in hair and nail samples were determined by ICP-MS. Mean selenium levels in hair and nail of the cases were significantly lower as compared to controls. A similar trend was noted for zinc in both hair and nail samples, whereas the mean level of copper was significantly higher in cases than controls. Similar elevation was noted for iron and manganese (p<0.05 for all parameters). Low levels of selenium and zinc and high levels of copper, iron and manganese appear to be associated with the risk of prostate cancer. Further studies to elucidate the causal mechanisms and appropriate chemopreventive measures are needed.
Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Zeolitic imidazolate framework (ZIF)-based membranes are emerging materials that are highlyattractive for gas separation and purification. Highly reproducible defect-free ZIF membranes with well-defined pore structures can be formed in a number of ways. The performance of ZIF membranes dependslargely on the preparation technique, application type, and operating conditions. Here, we review themethods of ZIF membrane preparation and discuss their performance in separating condensable andincondensable gases. In addition, recent developments in membrane synthesis and ways to improve thegas separation performance of ZIF membranes are discussed to promote industrial application andcommercialization of ZIF membranes.
Hind Jihad Kadhim Shabbani,Ammar Ali Abd,Tharveen Raj Rajalingam,Jinsoo Kim,Mohd Roslee Othman,Zuchra Helwani 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
This study explores the application of microporous APKS and ZIF-8 adsorbents for carbon dioxide capturefrom flue gas surrogate. The purity and recovery of N2 and CO2 in the product and waste stream weresimulated and experimented in the lab. The experimental breakthrough at different N2/CO2 streamadsorption compositions validated the Aspen adsorption model. Results from the simulation show thatin the product stream, factors such as adsorbent type (APKS), lower adsorption times, and low CO2 concentrationin the feed led to improved N2 purity. On the other hand, results from the experiment showthat the CO2 feed compositions, type of adsorbent and cyclical pressure swing operation correlated significantlywith the purity and recovery of the CO2 in the waste stream. Interestingly, as previously understood,the high surface area was important but not a guarantee to achieve the highest product purity. Thehighest CO2 purity of 83% was obtained using APKS. In contrast, the highest CO2 recovery of 65% wasobtained by ZIF-8. The degraded performance at the increasing cycle was due to the inability of both porousmedia to regenerate completely, causing product contamination and blockages of the CO2 affinitivesites of the adsorbents from capturing the gas effectively.