Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal Basic Information
Journal DOI :
The Korean Society of Clean Technology
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Dec 2012
Volume 18, Issue 3 - Sep 2012
Volume 18, Issue 2 - Jun 2012
Volume 18, Issue 1 - Mar 2012
Selecting the target year
Recent Development of Carbon Dioxide Conversion Technology
Choi, Ji-Na ; Chang, Tae-Sun ; Kim, Beom-Sik ;
Clean Technology, volume 18, issue 3, 2012, Pages 229~249
DOI : 10.7464/ksct.2012.18.3.229
At present, global warming and depletion of fossil fuels have been one of the big issues which should be solved for sustainable development in the future. CCS (carbon capture and sequestration) technology as the post
reduction technology has been considered as a promising solution for global warming due to increased carbon emission. However, the environmental and ecological effects of CCS have drawn concerns. There are needs for noble post reduction technology. More recently, CCU (carbon capture and utilization) Technology, which emphasizes transforming carbon dioxide into value-added chemicals rather than storing it, has been attracted attentions in terms of preventing global warming and recycling the renewable carbon source. In this paper, various technologies developed for carbon dioxide conversion both in gas and liquid phase have been reviewed. For the thermochemical catalysis in gas phase, the development of the catalytic system which can be performed at mild condition and the separation and purification technology with low energy supply is required. For the photochemical conversion in liquid phase, efficient photosensitizers and photocatalysts should be developed, and the photoelectrochemical systems which can utilize solar and electric energy simultaneously are also in development for more efficient carbon dioxide conversion. The energy needed in CCU must be renewable or unutilized one. CCU will be a key connection technology between renewable energy and bio industry development.
New Paradigm for Nanowastes Treatment
Umh, Ha-Nee ; Lee, Byoung-Cheun ; Kim, Young-Hun ;
Clean Technology, volume 18, issue 3, 2012, Pages 250~258
DOI : 10.7464/ksct.2012.18.3.250
Recent rapidly growth in nanotechnolgies is promised novel benefits through the exploitation of their unique industrial and biomedical applications. In addition, the production amount of these nanomaterials and nanoproducts has increased, and thus their uncontrolled release into the environment is anticipated to grow dramatically in future. Therefore, nanowaste streams must be effectively managed for sustainable nanotechnology. However, the effectiveness and capability of the current systems to handle nanowastes are yet to be established. In this review, we investigated several key topics for new paradigm of nanowaste treatment, (i) global and domestic production of nanomaterials and nanoproducts, (ii) definition and key resources of nanowaste, (iii) current and developing treatment method for nanowaste, and (iv) regulations for nanomaterials and nanoproducts.
Catalytic Combustion of Benzene over Perovskite-type Oxides Prepared Using Malic Acid Method
Jung, Won-Young ; Hong, Seong-Soo ;
Clean Technology, volume 18, issue 3, 2012, Pages 259~264
DOI : 10.7464/ksct.2012.18.3.259
Perovskite-type oxides were successfully prepared using malic acid method, characterized by TG/DTA, XRD, XPS, TEM and
-TPR and their catalytic activities for the combustion of benzene were determined. Almost of catalyst showed perovskite crystalline phase and 15-70 nm particle size. The
catalysts showed the highest activity and the conversion reaches almost 100% at
. The catalysts were modified to enhance the activity through substitution of metal into the A or B site of the perovskite oxides. In the
-type catalyst, the partial substitution of Sr into site the A-site enhanced the catalytic activity in the benzene combustion. In addition, the partial substitution of Co or Cu into site the B-site also enhanced the catalytic activity and the catalytic activity was in the order of Co > Cu > Fe in the
(B = Co, Fe, Cu) type catalyst.
Rapid Characterization and Prediction of Biomass Properties via Statistical Techniques
Cho, Hyun-Woo ;
Clean Technology, volume 18, issue 3, 2012, Pages 265~271
DOI : 10.7464/ksct.2012.18.3.265
The use of renewable energies has been required to diminish the dependency on fossil fuels. As one of clean energy sources biomass has been extensively studied because various biomass resources necessitated rapid characterization of their chemical and physical properties in an on-line or real-time basis. For such an analysis near-infrared (NIR) spectroscopy has been successfully applied because of its non-invasive and informative characteristics. In this work, the applicability of nonlinear chemometric techniques based on biomass near infrared (NIR) data is evaluated for the rapid prediction of ash/char contents in different types of biomass. The prediction results of various prediction models and the effect of using preprocessing methods for NIR data are compared using six types of biomass NIR data. The results showed that nonlinear prediction models yielded better prediction performance than linear ones. It also turned out that by adopting the use of proper preprocessing methods the performance of prediction of biomass properties improved.
Development of Environmental-friendly Cleaning Agents Utilizing Organic Acids for Removal of Scale on the Wall of Cleaning Beds and Distribution Reservoirs in the Waterworks
Lee, Jae-Ryoung ; Yoon, Hee-Keun ; Bae, Jae-Heum ; Shin, Hyun-Duk ;
Clean Technology, volume 18, issue 3, 2012, Pages 272~279
DOI : 10.7464/ksct.2012.18.3.272
In this study, an environmental-friendly cleaning agent utilizing organic acids and various additives has been developed and applied to the field for removal of scale deposited on the cleaning beds or distribution reservoirs of the waterworks. As an analytical result of scale on the cleaning beds, we found that it consists of mainly metallic oxides such as
, and MnO. Malic acid, malonic acid, and citric acid showed relatively better solvency on
, and MnO except
among various organic acids. Mixed organic acid solutions of malic acid, malonic acid, and citric acid were prepared with certain weight ratios and their solvencies on mixed metal oxides of
, and MnO were investigated. The experimental results showed that an 10% mixed organic acid solution prepared with weight ratio of malic acid : malonic acid : citric acid = 6 : 2 : 2 were found to have best scale solvency power of about 29%. The formulated cleaning agents with a small amount of nonionic surfactant showed much better solvency on mixed oxides than mixed organic solution alone. Especially, the formulated cleaning agent with 0.2 wt% LA-7 surfactant appeared to have best scale removal efficiency of about 35%. However, the formulated cleaning agent with disinfectants such as NaClO,
showed poor solvency on mixed oxides. It is inferred that surfactants are able to improve scale removal efficiency due to their capability of emulsification, and disinfectants cause to degrade scale solvency in water because of their oxidation. Based on these basic experimental results, formulated cleaning agents have been prepared with mixed organic acid solution, nonionic surfactants, and disinfectants and successfully applied to removal of scales on the cleaning beds and distribution reservoir at city D waterworks.
Effect of Alcohols on the Dry Etching of Sacrificial SiO
in Supercritical CO
Kim, Do-Hoon ; Jang, Myoung-Jae ; Lim, Kwon-Taek ;
Clean Technology, volume 18, issue 3, 2012, Pages 280~286
DOI : 10.7464/ksct.2012.18.3.280
The dry etching of sacrificial
was performed in supercritical carbon dioxide. The etching of boron phosphor silica glass (BPSG), tetraethyl orthosilicate (TEOS), thermal
, and Si-nitride (SiN) was investigated by using a two chamber system with HF/py etchant and alcohol additives. The etch rate of sacrificial
increased upon the addition of methanol. The etch selectivity of BPSG with respect to SiN was highest with IPA although the highest etch rate was resulted from methanol except BPSG. The etch rate increased with the temperature in HF/py/MeOH system. Especially the increase of the etch rate was much higher for BPSG with an increase in the reaction temperature. The etch residue was not reduced apparently upon the addition of alcohol cosolvents to HF/py. While the etch rate in HF/
was higher than HF/py/alcohol system, the rate decreased with the addition of alcohols to HF/
. The cantilever beam structure of high aspect ratios was released by the dry ething in supercritical carbon dioxide without damage.
Development of Cleaning System of Electronic Components for the Remanufacturing of Laser Copy Machine
Bae, Jae-Heum ; Chang, Yoon-Sang ;
Clean Technology, volume 18, issue 3, 2012, Pages 287~294
DOI : 10.7464/ksct.2012.18.3.287
In this study, performances of two cleaning methods were analyzed and a cleaning system was designed to develop a cleaning process of electronic components to remanufacture old laser copy machine. First, plasma cleaning as a dry cleaning method was executed to test cleaning ability. In cleaning of printed circuit board (PCB) by plasma, some damages were found near the metal parts, and considering the productivity, this method was not adequate for the cleaning of electronic components. With 4 different cleaning agents, ultrasonic cleaning tests were executed to select an optimal cleaning agent, aqueous agents showed superior cleaning performance compared to semi-aqueous and non-aqueous agents. Cleaning with aqueous cleaning agent A and 28 kHz ultrasonic frequency can be completed in 30 sec to 1 min. Finally, an ultrasonic cleaning system was constructed based on the pre-test results. Optimal cleaning conditions of 40 kHz and
were found in the field test. The productivity and economic efficiency in remanufacturing of laser copy machine are expected to increase by adapting developed ultrasonic cleaning system.
Micromolding Technique for Controllable Anisotropic Polymeric Particles with Convex Roof
Jeong, Jae-Min ; Son, Jung-Woo ; Choi, Chang-Hyung ; Lee, Chang-Soo ;
Clean Technology, volume 18, issue 3, 2012, Pages 295~300
DOI : 10.7464/ksct.2012.18.3.295
Synthesis of well-defined particle with tunable size, shape, and functionalities is strongly emphasized for various applications such as chemistry, biology, material science, chemical engineering, medicine, and biotechnology. This study presents micromolding method for the fabrication of anisotropic particles with elegant control of curvature of covex roof. For the demostration of rapid fabrication of the particles, we have applied polydimethylsiloxane (PDMS) micromold as structure guiding template and wetting fluid to control curvature of roof of the particles. Based on this approach, we can control the radius of curvature from
with different aspect ratio of mold. In addition, wetting fluids with different wetting properties can also modulate the height and radius of curvature of the particles. We envision that this methodology is promising tool for precise control of particle shape in 3-dimensional space and new synthetic route for anisotropic particles with cost effective, simple, easy, and fast procedure.
Environmental Assessment of Chemically Strengthened Glass for Touch Screen Panel by Material Life Cycle Assessment
Lee, Na-Ri ; Lee, Soo-Sun ; Kim, Kyeong-Il ; Hong, Tae-Whan ;
Clean Technology, volume 18, issue 3, 2012, Pages 301~306
DOI : 10.7464/ksct.2012.18.3.301
Rapidly growing mobile machines such as tablet PC and smart phone are equipped with touch screen panel using a sturdy material for products surface protection. Therefore, surge of chemically strengthened glass was increased and the amount of waste matter is proportional to demand. The purpose of this study is environmental impact assessment on touch screen panel of chemically strengthened glass by material life cycle assessment (MLCA). We used CES of Granta, SimaPro and Gabi software for MLCA. Chemically strengthened glass (2.7, 5.7 and 10.3 inch) was calculated to environmental impact assessment by Granta software under two cases. One case is Landfill and the other case is Reuse. As a result, in case of reuse, energy values of 2.7, 5.7 and 10.3 inches were reduced by an average of 51.4%,
values were reduced by an average of 46.6% than Landfill case, respectively. We assessed impact categories of 11 types using SimaPro software. As a result, the contents of fossil fuels, inorganics and climate change have a huge impact than the other impact categories. And the main cause of environmental impact is antimony and hydrogen fluoride in Gabi results.
Analysis of Zeolite Membrane Using Patent Information
Im, Eun-Jung ; Kim, Sung-Hyun ; Kim, Sang-Gon ; Hyeon, Dong-Hun ; Park, Sun-Hee ;
Clean Technology, volume 18, issue 3, 2012, Pages 307~311
DOI : 10.7464/ksct.2012.18.3.307
Patents is a strong asset. Samsung and Apple's patent lawsuit is a prime example. So many countries reinforce the intellectual property and they lay the emphasis on the patent. Utilizing the patent information efficiently is basic to the patent analysis. Patent information will provide for new science and technology information sources, international code is classified according to the international patent system IPC, being easily accessible. In this paper, analysis of foreign and domestic patents for zeolite technologies analysis using IPC. The current of technology development in such countries as Korea, USA, Japan, China and EU was analyzed by classifying the patents for 1992 through 2011 according to registration country, assignee, calendar year and technology area.
Adsorption Characteristics of Malachite Green on Zeolite
Lee, Jong-Jib ; Um, Myeong-Heon ;
Clean Technology, volume 18, issue 3, 2012, Pages 312~319
DOI : 10.7464/ksct.2012.18.3.312
Malachite green is used a dye but malachite green is harmful toxic substance. In this study, the adsorption characteristics of zeolite has been investigated for the adsorption of malachite green dissolved in water. The effects of initial dye concentration, contact time, pH and temperature on adsorption of malachite green by a fixed amount of zeolite have been studied in batch adsorber and fixed bed. The adsorption equilibrium data are successfully fitted to the Freundlich isotherm equation in the temperature range from 25 to
. The estimated values of k and
are 23.60-46.88, 0.225-0.347, respectively. The mechanism of the adsorption process was determined from the intraparticle diffusion model. The effects of the operation conditions of the fixed bed on the breakthrough curve were investigated. When the inlet concentration and initial flow rate of malachite green are increased, the corresponding adsorption breaktime appears to decrease. Breaktime increased with increasing bed height and length of adsorption zone showed similar patterns.
Evaluation Modeling Heat Generation Behavior for Lithium-ion Battery Using FEMLAB
Lee, Dae-Hyun ; Yoon, Do-Young ;
Clean Technology, volume 18, issue 3, 2012, Pages 320~324
DOI : 10.7464/ksct.2012.18.3.320
In the present study, the discharge characteristics of a lithium-ion battery was evaluated to calculate the rate of heat generation under various discharge rates by mathematical modeling. The modeling and simulation of a pseudo-two dimensional ionic transport system for governing Butler-Volmer equation were carried out by using FEMLAB as a PDE (partial differential equation) solver, where the discharge rate was changed from 5
. The computational results showed that the concentration of consumed solid-phase lithium at the surface of electrode was increased with increasing discharge rates. While the resulting diffusion limitation occurred shortly, it increased the rate of heat generation even more rapidly for the internal voltage to approach the cutoff voltage of the lithium-ion battery.
Improved Procedure for the Preparation of 9,9'-bis[4-(glycidyloxy)phenyl]fluorene
Kim, Jin-Won ; Shim, Jae-Jin ; Ra, Choon-Sup ;
Clean Technology, volume 18, issue 3, 2012, Pages 325~328
DOI : 10.7464/ksct.2012.18.3.325
The condensation reaction of 9,9'-bis(4-hydroxyphenyl)fluorene with epichlorohydrin to prepare 9,9'-bis[4(glycidyloxy) phenyl]fluorene (2), an important building block for fluorene-containing epoxy polymers, has been studied. The reaction is found to be quite sensitive to several experimental conditions such as reaction temperature and time, added amount of epichlorohydrin, the presence of catalysts and the use of co-solvent. Several conditions for obtaining the best yield in the reaction are: the reaction temperature is below 373 K and the reaction time is shorter than 1.5 h, and the ammonium salts act as a catalyst. Also, the use of ternary solvent (toluene, DMSO, water) has been proved to be crucial to maintain the reaction temperature and for an easy purification. Thus, the reaction proceeds in an environment-friendly manner where the use of reactants and the production of chemical wastes is minimized.