NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 30, No. 4, 2012 … 489 Korean J. Chem. Eng., 29(6), 703-706 (2012)
Evaluation of photocatalytic activity of carbon-doped TiO
2films under solar irradiation Donghyuk Jung*, Gyusun Kim*, Moon-Sun Kim**, and Byung-Woo Kim*,† †
*Department of Chemical Engineering, Sungkyunkwan University,
**Bio/Nano-Fusion Material Research Center, Sungkyunkwan University, 300, Cheoncheon-dong, Jangan-gu, Suwon 440-746, Korea
Abstract - We proposed a method to obtain carbon-doped TiO
2(C-TiO
2) with a higher photocatalytic activity for degradation of toluene. Solar radiation was used as a visible light source for photocatalytic oxidation. An optical fiber reactor(OFR) was used to investigate the photocatalytic oxidation of toluene in air. All C-TiO
2films used as catalysts were synthesized by a modified sol-gel and combustion method using carbon nanoparticles. The performance of the OFR using C-TiO
2was evaluated under various experimental conditions. The effects of solar flux, surface sensitization, inlet concentration of toluene and concentration of carbon nanopowder in C-TiO
2were examined.
Korean J. Chem. Eng., 29(6), 798-803 (2012)
Selective removal of iron from aqueous solution using ion imprinted thiocyanato-functionalized silica gel sorbents
Hong-Tao Fan*,** and Ting Sun**,† †
*College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China
**College of Sciences, Northeastern University, Shenyang 110004, China
Abstract - We combined surface imprinting technique with sol-gel process for preparing a new iron(III)-imprinted thiocyanato-functionalized silica gel sorbent using 3-thiocyanatopropyltriethoxysilane as the functional monomer, and epichlorohydrin as the cross-linking agent for the selective removal of iron(III) from aqueous solution. The iron(III)- imprinted thiocyanato-functionalized silica gel was characterized by FT-IR spectra, SEM, and the static adsorptiondesorption method. Maximum binding capacity, optimum pH, and equilibrium binding time were found to be 20.31 mg·g-1, pH 4.2, and 20min, respectively. The relative selectivity coefficients of Fe(III)-imprinted thiocyanato- functionalized silica gel sorbents for Fe(III)/Ni(II), Fe(III)/Co(II), Fe(III)/Cd(II) and Fe(III)/Pb(II) were 11.8, 10.6, 8.2 and 9.1 times greater than the non-imprinted silica gel, respectively. The iron(III)-imprinted thiocyanato-functionalized silica gel sorbents could be used repeatedly without decreasing in their adsorption capacities significantly.
Korean J. Chem. Eng., 29(7), 831-850 (2012)
Bioprocessing aspects of fuels and chemicals from biomass Sun Uk Lee*, Kwonsu Jung*, Gwon Woo Park*, Charles Seo*, Yeon Ki Hong**,
Won Hi Hong*,† †, and Ho Nam Chang*,† †
*Department of Chemical and Biomolecular Engineering, KAIST (Korea Advanced Institute of Science and Technology), 291, Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea
**Department of Chemical and Biological Engineering, Korea National University of Transportation, 50, Daehak-ro, Chungju-si, Chungbuk 380-702, Korea
Abstract - This review deals with a recent development of biofuels and chemicals from biomass. Some of the grainbased biofuels and chemicals have already been in commercial operation, including fuel ethanol, biodiesel, 1.3-propanediol, polylactic acid (PLA) and polyhydroxy butyric acid/alkanoates (PHB/PHA). The next generation bioproducts will be based on lignocellulosics due to their abundance and to stabilize rising food prices. However, the technologies of handling biomass are yet in their infancy and suffer from low yield, low product titer, and low productivity. This review focuses on bioprocessing technologies for biofuels production: organic raw biomaterials available in Korea; volatile fatty acids
Editor’s Choice
platform, multi-stage continuous high cell density culture (MSC-HCDC), enrichment of fermentation broth by forward osmosis; various purification methods of pervaporation of ethanol, solvent extraction on succinic, lactic acids and reactive separation methods.
Korean J. Chem. Eng., 29(7), 964-968 (2012)
Electrorheological properties of polypyrrole-silica nanocomposite suspensions Young Dae Kim† † and Gi Gwang Hong
Faculty of Applied Chemistry, Chonnam National University, 300, Yongbong-dong, Gwangju 500-757, Korea Abstract - The electrorheological (ER) and dielectric properties of PPy-silica nanocomposite suspensions in silicone oil were investigated. Various PPy-silica nanocomposite particles were synthesized by suspension polymerization in the presence of silica nanoparticles controlling the ratio of silica/pyrrole during the polymerization. The ER response and the particle conductivity increased with the increase in the silica/pyrrole ratio, indicating that the increased particle polarization plays a role in enhancing the ER response. The dielectric properties of PPy-silica nanocomposite particles and their suspensions support that the enhanced ER response with the increase in the silica/pyrrole ratio arises from the enhanced polarization, which originates from the increased particle polarization.
Korean Chem. Eng. Res., Vol. 50, No. 3, June, 2012, pp. 427-434
알카리 금속염으로부터 대전방지용 수분산 폴리우레탄 코팅용액 제조
홍
홍민 민기 기· ·김 김병 병석 석· ·이 이용 용운 운· ·송 송기 기창 창† † 건양대학교 화공생명학과 320-711 충남 논산시 내동 26 요
요약 약 - Poly (carbonate diol)과 isophrone diisocyanate 그리고 dimethylol propionic acid로 부터 NCO/OH 몰 비를 0.8, 1.1, 1.3으로 각각 조절하여 수분산 폴리우레탄(waterborne polyurethane dispersion, PUD)을 합성하였다. 이 용액에 알카 리 금속염인 LiClO4, NaClO4, KClO4를 첨가하여 대전방지용 수분산 폴리우레탄 코팅 용액을 제조하였다. 이 과 정에서 첨가되는 알카리 금속염의 첨가량과 종류가 코팅 도막의 표면저항에 미치는 영향을 살펴보았다. 알카리 금속염의 첨가량이 증가될수록 코팅 도막의 표면저항은 감소하였다. 그러나 PUD에 같은 양의 알카리 금속염이 첨가될 경우에는 LiClO4>NaClO4>KClO4의 순서로 코팅 도막의 이온 전도도가 우수함을 알 수 있었다. 또한 PUD 내의 NCO/OH 몰 비가 증가함에 따라 코팅 도막의 표면저항이 증가하여 이온 전도도가 감소하였다.
Korean Chem. Eng. Res., Vol. 50, No. 3, June, 2012, pp. 479-491
계통한계가격 예측모델에 근거한 통합 지역난방 시스템의 최적화
