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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Clean Technology
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Volume & Issues
Volume 17, Issue 4 - Dec 2011
Volume 17, Issue 3 - Sep 2011
Volume 17, Issue 2 - Jun 2011
Volume 17, Issue 1 - Mar 2011
Selecting the target year
Carbon Dioxide-reducible Biodegradable Polymers
Lee, Won-Ki ;
Clean Technology, volume 17, issue 3, 2011, Pages 191~200
Natural polymers, biopolymers, and synthetic polymers based on renewable resources are the basis for the 21th portfolio of sustainable and eco-friendly plastics but high-volume consumable plastics continue to be dominated by nondegradable petroleum-based materials. Three factors have recently made biodegradable polymers economically attractive: (i) rising costs of petroleum production resulting from the depletion of the most easily accessible reserves, (ii) environmental and economic concerns associated with waste plastics, and (iii) emissions of carbon dioxide from preparation of petroleum-based materials. These pressures have driven commercial applications based on biodegradable polymers which are related to reduction of carbon dioxide in processing, such poly(hydroxy alkanoate) and poly (lactide). Since initial degradation of these polymers leads to catastrophic mechanical failure, it is necessary to control the rate of initial degradation for commercial applications. In this article, we have a critic review on the recent progress of polymer modification for the control of degradation.
Recent Development to Generate Carbon Dioxide-based Cyclic Carbonate and Polycarbonate
Kwon, Doo-Yeon ; Kim, Jae-Il ; Kang, Hwi-Ju ; Kim, Da-Yeon ; Kim, Jae-Ho ; Lee, Bong ; Kim, Moon-Suk ;
Clean Technology, volume 17, issue 3, 2011, Pages 201~208
The green house gas, carbon dioxide, can be utilized as raw materials to prepare carbon dioxide-based polycarbonates in research and industry. The carbon dioxide-based polycarbonates is one of the emerging low-cost green polymers. Recently, the fast development of carbon dioxide-based polycarbonates has created new chances for industry. In this review, we describe the preparation and characterization of cyclic carbonate monomer using carbon dioxide, oxiranes and oxetanes in the presence of various catalysts and preparation of polycarbonates from cyclic carbonate monomer, presenting an organized and detailed overview of the state of the art.
Drying Characteristics of Fine Polymers in an Inert Medium Fluidized Bed
Kim, Og-Sin ; Lee, Dong-Hyun ;
Clean Technology, volume 17, issue 3, 2011, Pages 209~214
The effects of inlet gas velocity (0.26-0.31 m/s), inlet gas temperature (315-353 K) and the mass ratio (0.1-0.4) of fine polymer (crosslinked poly methyl methacrylate beads) to inert medium particles on the drying rate of fine polymer in a 0.15 m-ID
1.0 m-high inert medium fluidized bed dryer have been investigated. Crosslinked PMMA beads of 20
(group C) were used as fine polymer, and glass beads of 590
(group B) were used as the inert medium. The drying rate increases with increasing inlet gas temperature and velocity. However, the drying rate decreases slightly as the mass ratio of fine polymer to inert medium particles increases. The particle size distribution of dried fine polymers was mono distribution.
Development of an On-line Measurement Method for Clean Biofuel Based on Near Infrared Spectroscopy and Chemometrics
Cho, Hyeong-Su ; Ryu, Jun-Hyung ; Liu, J. Jay ;
Clean Technology, volume 17, issue 3, 2011, Pages 215~224
It is an important issue to develop quality assessing system for biofuel for the purpose of accelerating the mass production of biofuel. It is particularly challenging to conduct testing method in the mass production of bioethanol while meeting quality specifications such as ASTM (American Society for Testing & Materials) D4806-10. In order to address this challenge, this paper proposes on-line spectroscopic quality assesment system based on Near Infrared spectrum and Partial Least Squares method in Chemometrics. As a result of testing a number of preprocessing methods and Partial Least Squares, it was found out that Savitzky-Golay method showed the best performance in terms of spectrum correction, noise reduction, and model maintenance. The proposed system allows us to assess multiple quality components continuously using spectroscopic facilities with the cheap cost. Since the value of R2 is more than 0.99, it is possible to replace the laboratory analysis.
A Study of the Reaction Characteristics on Hydrocarbon Selective Catalytic Reduction of NOx Over Various Noble Metal Catalysts
Kim, Sung-Su ; Jang, Du-Hun ; Hong, Sung-Chang ;
Clean Technology, volume 17, issue 3, 2011, Pages 225~230
Characteristics of hydrocarbon selective catalytic reduction of NOx using various noble metal catalysts were investigated. The best active metal is Pt, supports are
by strong interactions between active metals, and 55% of conversion rate of NOx is shown. Pd, Rh and Ag catalysts presented a conversion of less than 20% as active metals, and supports also showed the poor activity compared to
. Experiments were performed with different types of reducing agents, amount, concentration of oxygen and space velocity in order to investigate the performance of catalysts according to operating conditions. The results confirm that the methane is better than propane as a reducing agent, and as the ratio of methane/nitrogen oxide increases, the catalytic activity increased, as the concentration of oxygen increases and space velocity decreases, the performance of catalysts increased.
Detection of Intracellular Free Metal Ions with Molecular Two-Photon Sensors
Kim, Hwan-Myung ;
Clean Technology, volume 17, issue 3, 2011, Pages 231~237
Two-photon microscopy (TPM) is attracting much attention in biological imaging due to the capability of imaging deep inside the living tissues for a long period of time. For maximum utilization of TPM, it is essential to develop efficient twophoton sensors. Regarding this, many research groups are developing two-photon sensors for specific applications. In this review, we summarize recent results on selected examples of two-photon sensors for intracellular free metal ions in the live cells and tissues to provide a guideline for various imaging applications.
Synthesis of Polyols Based on Castor Oil with Maleic Anhydride and Aminoalcohol Derivatives for Polyurethanes
Jung, Sung-Gil ; Jeong, Jae-Hyeok ; Kim, Sang-Wook ; Kwon, O-Pil ;
Clean Technology, volume 17, issue 3, 2011, Pages 238~243
We investigate new polyols based on castor oil for polyurethane. In order to introduce primary alcohol groups, which exhibit higher reactivity with isocyanate than secondary alcohol groups, the secondary alcohol groups on castor oil were modified with maleic anhydride and aminoalcohol derivatives (
-R-OH). The reactions with various molar ratio of castor oil and maleic anhydride were done at relatively low reaction temperature in the absence of catalyst. The polyols based on castor oil with flexible side-chains exhibit better miscibility with conventional synthetic polyols.
Synthesis of Low Molecular-weight Poly (Propylene Carbonate)-Poly (Ethylene Glycol) Block Copolymers through
/Propylene Oxide Copolymerization
Lee, Sang-Hwan ; Cyriac, Anish ; Jeon, Jong-Yeob ; Lee, Bun-Yeoul ;
Clean Technology, volume 17, issue 3, 2011, Pages 244~249
We synthesized low molecular-weight polymers bearing hydrophobic and hydrophilic parts in a chain through
/propylene oxide copolymerization. When hydrophilic poly (ethylene glycol) bearing -OH group (s) at the end group (s) was added as a chain transfer agent in the
/propylene oxide copolymerization catalyzed by a highly active catalyst, block polymers were formed. If poly (ethylene glycol) (PEG) bearing -OH group only at an end was fed, PEG-block-PPC diblock copolymer was obtained. When PEG bearing -OH group at both ends was fed, PPC-block-PEG-block-PPC triblock copolymer was obtained. We confirmed formation of block copolymers by
-NMR spectroscopy and GPC studies.
Large Scale Treatment of Perfluorocompounds Using a Thermal Plasma Scrubber
Han, Sung-Han ; Park, Hyun-Woo ; Kim, Tae-Hee ; Park, Dong-Wha ;
Clean Technology, volume 17, issue 3, 2011, Pages 250~258
Thermal plasma has been presented for the decomposition of perfluorocompounds (PFCs) which are extensively used in the semiconductor manufacturing and display industry. We developed pilot-scale equipment to investigate the large scale treatment of PFCs and called it a "thermal plasma scrubber". PFCs such as
used in experiments were diluted with
. There were two different types of experiment setup related to the water spray direction inside the thermal plasma scrubber. The first type was that the water was sprayed directly into the gas outlet located at the exit of the reaction section. The second type was that the water was sprayed on the wall of the quenching section. More effective decomposition took place when the water was sprayed on the quenching section wall. For
the maximum destruction and removal efficiency was nearly 100%, and for
was up to 93%.
Full-scale EFC Study on Oil Recovery and Reuse from Discharge Gas of Tenter Facility in Textile Industry
Hwang, Yeal-Soon ; Park, Hee-Jae ; Chung, Gu-Hoi ; Kim, Duk-Hyun ; Na, Byung-Ki ;
Clean Technology, volume 17, issue 3, 2011, Pages 259~265
The textile industry is suffered from air pollution problems which must be resolved. In particular, white smoke and odor after the tenter process require abatement. The major air pollution problem in the textile industry occurs during the finishing stages, where various chemicals are used for coating the fabrics. Lubricating oils, plasticizers, and water repellent chemicals are the fabric treatment chemicals. The coated fabrics are cured by heating in tenter facility. In this process, most of air pollutants emitted into the air. White smoke is basically made up of tiny solid or liquid particles of VOCs less than one micron in size. The oil mist can be carried over long distance from their point of origin. The most effective method of removing odor from tenter process is to get rid of tiny oil mist at the emitted gas. For this reason, the full-scale EFC (Electric Fume Collector) of 700 CMM was tested for removing odorous substances emitted from tenter facility. As a result of this study, odor and white smoke can be eliminated effectively and quite large amounts of oil can be recovered.
Fatty Acid Composition and Oxidative Properties of Anchovy Oil Extracted by Supercritical Carbon Dioxide
Lee, Seung-Mi ; Yun, Jun-Ho ; Chun, Byung-Soo ;
Clean Technology, volume 17, issue 3, 2011, Pages 266~272
Anchovy oil was extracted using supercritical carbon dioxide (
) and organic solvents. Extraction was carried out at temperature range from 40 to
, and pressure range from 15 to 25 MPa. The flow rate of
) was constant entire the extraction period of 1.5 h. The fatty acid composition of anchovy oil was analyzed by gas chromatography (GC). The main fatty acids of anchovy oil were myristic acid, palmitic acid, stearic acid, palmitoleic acid, EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid). In addition, the oil obtained by
extraction contained a higher percentage of polyunsaturated fatty acids especially EPA and DHA comparing to the organic solvent extracted oil. The oxidative stability of oils extracted from Anchovy by
extraction was compared to those extracted by organic solvents. Results showed that the storage periods of oils obtained by
extraction were longer than those of organic solvents extraction.
Toxicity Analysis of Carbon Nanotubes Based on Their Physicochemical Properties
Kim, Soo-Nam ; Kang, Min-Sung ; Han, Young-Ah ; Kim, Jae-Hwan ; Roh, Jin-Kyu ; Kim, Young-Hun ; Choi, Sang-Dun ; Park, Eun-Jung ;
Clean Technology, volume 17, issue 3, 2011, Pages 273~279
The physicochemical properties of manufactured nanomaterials can vary depending upon the methods of manufacture, although the utilized raw materials are same. Hence, the toxicity can also vary based on the methods of nanomaterials manufacture. In this study, we compared the toxicity effect of two types of CNTs (MWCNT, multi-walled carbon nanotube; SWCNT, single-walled carbon nanotube) that differ in length and wall number. In case of MWCNTs, inflammatory responses were more strongly induced in longer groups, whereas body weights more clearly decreased in shorter groups. SWCNT significantly decreased the relative weights of brain and kidney, and the inflow of immune cells and the hematological changes were observed significantly on day 1 and day 7 after exposure, respectively. Our results showed that the length and wall number of CNTs can serve as critical factors in the exhibited inflammation and toxicity.
Separation of Xanthorhodopsin from Salinibacter ruber and Its in vitro Reconstruction
Kong, Min-Kyung ; Yim, Joung-Han ; Lee, Pyung-Cheon ;
Clean Technology, volume 17, issue 3, 2011, Pages 280~282
Capture and conversion of abundant solar energy using biotechnology will be essential for the development of sustainable and future energy. Photosynthesis is used for the production of biofuels such as biohydrogen. In this study, lightharvesting xanthorhodopsin consisting of retinal and salinixanthin was isolated from a photosynthetic microorganism Salinibacter ruber by aqueous two phase extraction. To stabilize the light-harvesting machine, artificial xanthorhodopsin-liposome system was reconstructed to have photoelectron absorption activity.