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Alginate Bead를 이용한 니켈, 아연, 카드뮴의 흡착특성에 관한 연구
정흥조 조선대학교 기초과학연구원 2011 조선자연과학논문집 Vol.4 No.2
This study investigated the adsorption characteristics of nickel, zinc and cadmium ions from the aqueous solution onto the alginate bead. Adsorption equilibrium capacities of the heavy metal ions increased with increasing initial pH of the solution. The adsorption equilibrium isotherm of the heavy metal ions was well represented by Langmuir equation. The magnitude of adsorption capacity of the heavy metal ions onto alginate bead was the order of cadmium > zinc > nickel. Kinetic parameters were measured in a batch adsorber to analyze the adsorption rates of the heavy metal ions. The internal diffusion coefficient of the heavy metal ions in the intraparticle were determined by comparing the experimental concentration curves with those predicted from the surface diffusion model (SDM) and pore diffusion model (PDM). The internal diffusion of the heavy metal ions in the intraparticles was explained by PDM.
Adsorption and Photocatalysis of Spherical TiO2 Particles Prepared by Hydrothermal Reaction
정흥조 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.4
TiO2 spherical particles were prepared using hydrothermal reaction at different temperatures of 110, 150 and 190℃ for 5 h. The TiO2 samples were characterized by BET, XRD and SEM analysis. Specific surface areas and particle sizes are in the range of 148 ~ 240 m2g-1 and 323 - 450 nm, composed of tiny nanoparticles with size of 5 ~ 7 nm. It was found that photocatalytic degradation of methylene blue is highly sensitive to particle sizes on the adsorption and photocatalysis.
Characterization of TiO_2 Nanocrystalline Films for High Performance Dye-Sensitized Solar Cells
정흥조 한국전기전자재료학회 2011 Transactions on Electrical and Electronic Material Vol.12 No.3
Titanium dioxide (TiO_2) thin films were deposited by the sol-gel method with a surfactant-assisted mechanism. Its application for dye-sensitized solar cells (DSSCs) was investigated. Brunauer-Emmett-Teller, X-ray diffraction and field emission scanning electron microscopy techniques were used to characterize the surface characteristics of thin films. Photovoltaic-current density measurements were performed to determine the photoelectrochemical properties of the thin films and the performance of DSSCs. Energy conversion efficiency of about 6.1% was achieved for cells with conductive glass under illumination with AM 1.5 (100 mWcm^(-2)) simulated sunlight. Investigation showed higher photo-energy conversion efficiency for mesoporous TiO_2 nanocrystalline films used in DSSCs relative to commercially available Degussa P25 films.
Highly Porous Carbon Sorbents Prepared from Bean Dregs for Electric Double-Layer Supercapacitor
정흥조,박경희,김찬,Tae Young Kim,Jae-Wook Lee 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
Environment-friendly and cost-eff ective carbons were prepared for application in high-performance supercapacitors usingbean dregs via carbonization and activation. The prepared samples were characterized using scanning electron microscopyand Brunauer–Emmett–Teller analysis. Furthermore, the electrochemical properties and capacitive behavior of the electrodeswere systematically studied using cyclic voltammetry and AC impedance analysis. The porous carbon activated at 900 °C for60 min had the largest specifi c surface area (3700 m 2 g −1 ) and the highest capacitance (260 F g −1 ) at a scan rate of 1 mV s −1 .
개체군수지 모델을 이용한 기포와 다공성 탄소의 충돌 및 부상 효율 평가
정흥조 ( Heung-joe Jung ),이재욱 ( Jae-wook Lee ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
In this work, porous carbons with high surface area were prepared from giant Miscanthus through simple carbonization and activation processes. Adsorption equilibrium and kinetic data of methylene blue on the prepared carbon samples were well fitted with isotherm and kinetic models. On the other hand, the removal efficiency of porous carbons in DAF (dissolved air flotation) was evaluated based on the population balance model. Results showed that the zeta potential was highly sensitive depending on the water properties and coagulation conditions. It was also found that the collision efficiency of bubble-carbon particles in terms of zeta potential was successfully simulated by the employed population balance model.
미세플라스틱 분리를 위한 미세기포 부상공정에서 개체군수지를 이용한 초기 부착 계수 및 부상특성의 평가
정흥조 ( Heung Joe Jung ),이재욱 ( Jae Wook Lee ),곽동희 ( Dong Heui Kwak ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.1
In the flotation process to remove microplastic (MP) particles, the attachment and separation efficiency is determined by the basic physicochemical characteristics of MP particles as well as bubbles. To evaluate the flotation characteristics of MP particles, we carried out a series of simulations using the population balance (PB) model. The initial attachment coefficient (α<sub>o</sub>) of MP particles was in the range of 0.2-0.275, and it was slightly lower than that of typical particles, such as clay, debris and algae particles, which exist in water bodies, α<sub>o</sub>, 0.3-0.4. The relative bubble number (RBN) attached to the surface of the typical number of bubbles was 0.30 and 0.32 for MP 30 μm and MP 58 μ m, respectively. In comparison, the RBN of larger MP particles (138 μm) was as high as 0.53. Furthermore, smaller microbubbles were required to separate properly or additional treatment needed to be applied to enhance collision and attachment efficiency since the flotation of MP particles was found to be difficult to treat as high-rate. As a result of comparing the removal rate (experimental value) of MP particles obtained from the batch-type flotation apparatus and the flotation removal rate (predicted value) of MP obtained through the PB model, the final particles by the particle size of MP overall except for the initial separation time area. With respect to the removal efficiency, the observed and predicted values were similar, and it was confirmed that the floating separation characteristics and evaluation of the MP particles through the PB model could be possible.
전종익,정흥조,( Ramesh Thiruvenkatachari ),심왕근,문희,이재욱 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
The performance of hybrid process consisting of coagulation and membrane treatment was evaluated for secondary domestic wastewater reuse. The determined optimal coagulation condition was 0.75 g l-1 coagulant dose and pH 6. The objective of this hybrid process was to identify the optimum method of combining coagulation with microfiltration membrane system. The process of combination of coagulation treatment with membrane, involves two different methods. Firstly, coagulation was introduced as a pretreatment for membrane operation. Secondly, coagulation was integrated with membrane treatment as a in-line process. The performances were compared in terms of flux decline and removal efficiency. Result showed that the former was more efficient as well as essential for the prevention of flux decline than the latter. The removal efficiency was about 70%. It was found that coagulation-membrane hybrid process was suitable for secondary domestic wastewater reuse.