Editor’s Choice

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Editor’s Choice

NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 36, No. 6, 2018 … 807 Korean Journal of Chemical Engineering,

Vol.35, No.11, 2145-2149, 2018

Continuous methanol synthesis directly from methane and steam over Cu(II)-exchanged mordenite

Lee SH, Kang JK, Park ED

Abstract - The formation of methanol directly from methane and steam was observed over Cu ion-exchanged mordenite.

Furthermore, the continuous production of methanol was achieved by co-feeding methane and steam over Cumordenite.

The methanol production rate was comparable to that reported in the stepwise process in which activation, methane reaction, and extraction of methanol were carried out separately.

Korean Journal of Chemical Engineering, Vol.35, No.11, 2185-2190, 2018

Oxychlorination of methane over FeOx/CeO

2

catalysts

Kim JE, Ryou YS, Hwang GH, Bang JU, Jung JW, Bang YJ, Kim DH

Abstract - Methane activation through oxychlorination is in the spotlight due to the relatively mild reaction conditions at atmospheric pressure and in the temperature range of 450-550 °C. Although CeO2 is known to exhibit good activity for methane oxychlorination, significant amounts of by-products such as CO2, CO and carbon deposits are produced during the reaction over CeO2. We investigated the effect of iron in FeOx/CeO2 catalysts on methane oxychlorination. FeOx/CeO2

with 3 wt% iron shows the maximum yield at 510 °C with 23% conversion of methane and 65% selectivity of chloromethane. XRD and H2 TPR results indicate that iron-cerium solid solution was formed, resulting in the production of more easily reduced cerium oxide and the suppression of catalysts sintering during the reaction. Furthermore, the selectivity of by-products decreased more significantly over FeOx/CeO2 than cerium oxide, which can be attributed to the facilitation of HCl oxidation arising from the enhanced reducibility of the former sample.

Sublayer assisted by hydrophilic and hydrophobic ZnO nanoparticles toward engineered osmosis process

Mansouri S, Khalili S, Peyravi M, Jahanshahi M, Darabi RR, Ardeshiri F, Rad AS

Abstract - Hydrophilic and hydrophobic polyethersulfone (PES)-zinc oxide (ZnO) sublayers were prepared by loading of ZnO nanoparticles into PES matrix. Both porosity and hydrophilicity of the hydrophilic sublayer were increased upon addition of hydrophilic ZnO, while these were decreased for the hydrophobic sublayer. In addition, the results demonstrated that the hydrophilic membrane exhibited smaller structural parameter (S value or S parameter or S), which is beneficial for improving pure water permeability and decreasing mass transfer resistance. In contrast, a higher S parameter was obtained for the hydrophobic membrane. With a 2M NaCl as DS and DI water as FS, the pure water flux of hydrophilic TFN0.5 membrane was increased from 21.02 L/m² h to 30.06 L/m² h and decreased for hydrophobic TFN0.5 membrane to 14.98 L/

m² h, while the salt flux of hydrophilic membrane increased from 10.12 g/m² h to 17.31 g/m² h and decreased for hydrophobic TFN0.5 membrane to 3.12 g/m² h. The increment in pure water permeability can be ascribed to reduction in S parameter, which resulted in reduced internal concentration polarization (ICP). The current study provides a feasible and low cost procedure to decrease the ICP in FO processes.

Template-free preparation of TiO

2

microspheres for the photocatalytic degradation of organic dyes

Ruqaishy MA, Marzouqi FA, Qi K, Liu SY, Karthikeyan S, Kim YH, Al-Kindy SMZ, Kuvarega AT, Selvaraj R Abstract - TiO2 microspheres were successfully synthesised by simple solution phase method by using various amount of

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Editor’s Choice

808 … NICE, 제36권 제6호, 2018

titanium butoxide as precursor. The prepared TiO2 were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance absorption spectra (UV-DRS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XRD analysis revealed that the as-synthesized TiO2 microsphere poses an anatase phase. The photocatalytic degradation experiments were carried out with three different dyes, such as methylene blue, brilliant black, reactive red-120 for four hours under UV light irradiation. The results show that TiO2 morphology had great influence on photocatalytic degradation of organic dyes. The experimental results of dye mineralization indicated the concentration was reduced by a high portion of up to 99% within 4 hours. On the basis of various characterization of the photocatalysts, the reactions involved to explain the photocatalytic activity enhancement due to the concentration of titanium butoxide and morphology include a better separation of photogenerated charge carriers and improved oxygen reduction inducing a higher extent of degradation of aromatics.

Effects of the gold nanoparticles including different thiol functional groups on the performances of glucose-oxidase-based glucose sensing devices

Christwardana M, Chung YJ, Tannia DC, Kwon YC

Abstract - Thiol-based self-assembled anchor linked to glucose oxidase (GOx) and gold nanoparticle (GNP) cluster is suggested to enhance the performance of glucose biosensor. By the adoption of thiol-based anchors, the activity of biocatalyst consisting of GOx, GNP, polyethyleneimine (PEI) and carbon nanotube (CNT) is improved because they play a crucial role in preventing the leaching out of GOx. They also promote electron collection and transfer, and this is due to a strong hydrophobic interaction between the active site of GOx and the aromatic ring of anchor, while the effect is optimized with the use of thiophenol anchor due to its simple configuration. Based on that, it is quantified that by the adoption of thiophenol as anchor, the current density of flavin adenine dinucleotide (FAD) redox reaction increases about 42%, electron transfer rate constant (ks) is 9.1±0.1 s^-1 and the value is 26% higher than that of catalyst that does not use the anchor structure.

Facile synthesis of ZnBi

2

O

4

-graphite composites as highly active visible-light photocatalyst for the mineralization of rhodamine B

Nguyen TMT, Bui TH, Dang NNK, Ho NNH, Vu QH, Ngo TTV, Do MH, Duong PD, Nguyen TKP

Abstract - Novel highly active visible-light photocatalysts in the form of zinc bismuth oxide (ZnBi2O4) and graphite hybrid composites were prepared by coupling via a co-precipitation method followed by calcination at 450 oC. The asprepared ZnBi2O4-graphite hybrid composites were tested for the degradation of rhodamine B (RhB) solutions under visible-light irradiation. The existence of strong electronic coupling between the two components within the ZnBi2O4-graphite heterostructure suppressed the photogenerated recombination of electrons and holes to a remarkable extent. The prepared composite exhibited excellent photocatalytic activity, leading to more than 93% of RhB degradation at an initial concentration of 50mg·L^-1 with 1.0 g catalyst per liter in 150min. The excellent visible-light photocatalytic mineralization of ZnBi2O4-1.0graphite in comparison with pristine ZnBi2O4 could be attributed to synergetic effects, charge transfer between ZnBi2O4 and graphite, and the separation efficiency of the photogenerated electrons and holes. The photo-induced h+ and the superoxide anion were the major active species responsible for the photodegradation process. The results demonstrate the feasibility of ZnBi2O4-1.0graphite as a potential heterogeneous photocatalyst for environmental remediation.

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Editor’s Choice

NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 36, No. 6, 2018 … 809 Korean Chemical Engineering Research,

Vol.56, No.5, 607-624, 2018

SAFT 상태 방정식과 회합성 유체 혼합물의 기액 상평형

SAFT Equation of State for Vapor-liquid Phase Equilibria of Associating Fluid Mixtures 장재언

Abstract - SAFT 상태 방정식이 기초하는 TPT이론과 통계역학적 원리를 개괄하고, 회합성 유체 혼합물의 기액 상평형을 예측하는 유용한 도구로 사용될 수 있음을 확인한다. PC-SAFT 상태 방정식의 이론적 구조를 상세히 검토하고, 비극성 혼합물, 극성 혼합물, 회합성 혼합물에 단계적으로 적용하는 과정을 통하여, 상태 방정식의 적용성과 성능을 평가한다.

PCSAFT 상태 방정식은 기존의 공학용 상태 방정식과는 대조적으로, 경험적인 이성분 상호작용 매개변수의 사용 없이 다양한 혼합물들의 비이상적 거동을 정확하게 예측할 수 있다. 이는 SAFT 이론이 분자들 사이의 다양한 상호작용을 효과적으로 반영하는 분자 수준의 엄밀한 이론 체계에 기초하기 때문이며, 다성분 혼합물의 복잡한 열역학적인 현상에 대한 응용에서 실질적 이점을 제공한다.

Korean Chemical Engineering Research, Vol.56, No.5, 705-710, 2018

백금 나노입자가 분산된 3차원 산화구리 나노구조체 기반의 글루코스 검출용 비효소적 전기화학 센서 개발

Non-Enzymatic Glucose Sensor Based on a Copper Oxide Nanoflowers Electrode Decorated

with Pt Nanoparticles

송민정

Abstract - 본 연구에서는 백금 나노입자가 분산된 산화구리 나노구조체 기반의 비효소적 글루코스 센서를 개발하였다.

3차원 구조의 산화구리 나노구조체는 hydrothermal method를 통해 Cu foil 위에 직접 합성되었으며, 합성된 나노구조체 표면 위에 전기화학적 증착법으로 백금 나노입자들을 분산시켜 전극을 제작하였다. 준비된 전극 샘플의 표면 구조는 주사 전자 현미경(SEM)과 에너지분산형 분광기(EDS)을 이용하여 분석하였으며, 전기화학적 특성 및 센싱 성능은 알칼리 상태에서 시간대전류법 (CA)과 순환전압 전류법(CV)을 통하여 조사하였다. 개발된 비효소적 글루코스 센서는 산화구리 나노구조체와 백금 나노입자의 접목에 의한 시너지 효과 덕분에 높은 감도와 넓은 선형 구간, 빠른 감응 속도 등의 향상된 센싱 특성을 보였다.

Korean Chemical Engineering Research, Vol.56, No.5, 732-737, 2018

Phase Equilibrium of Binary Mixture for the (Carbon Dioxide + 1-Phenyl-2-Pyrrolidone) System at High Pressure

Lee H, Jeong JD, Byun HS

Abstract - Experimental data of phase equilibria are reported for the binary mixture of 1-phenyl-2-pyrrolidone in supercritical carbon dioxide. Phase behavior data was measured in a synthetic method at a temperature ranging from 333.2 to 393.2 K and at pressures up to 97.14 MPa. The solubility of 1-phenyl-2-pyrrolidone in the carbon dioxide + 1- phenyl-2- pyrrolidone system increased as temperature increased at a constant pressure and it exhibited the type-I phase behavior. The experimental data for the binary mixture were correlated with the Peng-Robinson equation of state using mixing rule and the critical properties of 1-phenyl-2-pyrrolidone were predicted with the Joback and Lyderson method.