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Articles : Removal of Nitrogen Oxides from Air by chemicals-Impregnated carbons
( Yasushi Takeuchi ),( Kohjiro Yanagisawa ),( Yuhsuke Tanaka ),( Noriyuki Tsuruoka ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.5
Fixation of nitrogen oxides (NO_x) in air onto granular activated carbon impregnated with chemicals was attempted to improve removal efficiency of NO_x by activated carbon adsorption. Nitric oxide (NO) and nitrogen dioxide (NO₂), were tried to remove by a flow test. Fixed-bed adsorption breakthrough curves were obtained when some kinds of carbon were used. The amount adsorbed of NO₂changed with the amount and kinds of metallic salts impregnated. Chemicals-impregnated carbons were prepared from a commercial activated carbon. Among obtained carbons, the one which showed the highest selectivity for NO_x was chosen, and its performance with the change in humidity was determined. Removal mechanism of NO₂was estimated, and the carbon impregnated with potassium hydroxide was found to be superior to any other carbon tested. The amount of the adsorbed NO and that produced by the reduction of NO₂were determined from the breakthrough curves.
Demulsification of O/W Emulsion and Subsequent Water Treatment Using Powder Adsorbent
Yasushi Takeuchi,Lee, Sung Sik,Mitsuhiro Nakamura 한국화학공학회 1989 NICE Vol.7 No.2
Demulsification of stable oil-in-water emulsion was studied using powder adsorbent. Among various adsorbents tested, activated carbon was found to be the most efficient regardless of the type of surfactants used. The more dose of activated carbon for the demulsification was required, the higher concentration of the surfactant as well as the larger amount of oil and the bigger size of the lipophilic and hydrophilic groups. Empirical equations were obtained to correlate the dose of activated carbon to the residual concentration of oil as a function of the initial concentration of surfactant.
Chelation of Calcium Ions by Poly(γ-Glutamic Acid) from Bacillus subtilis (Chungkookjang)
( Moon Hee Sung ),( Chung Park ),( Yasushi Takeuchi ),( Hiroshi Uyama ),( Tsujinmoto ),( Takashi ),( Junya Kimura ) 한국미생물 · 생명공학회 2010 Journal of microbiology and biotechnology Vol.20 No.10
Many studies have clarified that poly(γ-glutamic acid) (PGA) increases the solubility of Ca2+, suggesting that PGA enhances calcium absorption in the small intestine. However, there has been no report on the specific interaction between PGA and Ca2+ in water. We studied the aqueous solution properties of PGA calcium salt (PGA-Ca complex). The chelating ability and binding strength of PGA for Ca2+ were evaluated. The PGA-Ca complex was soluble in water, in contrast to the insolubility of poly(acrylic acid) (PAA) calcium salt, and the chelating ability of PGA for Ca2+ was almost the same as that of PAA. The globular conformation of the PGA-Ca complex in water was estimated by SEC and viscosity measurements. The chelation ability of PGA for Ca2+ was examined by 1H NMR. The present study showing the characteristics of the PGA-Ca complex will provide useful information about the calcium absorption by PGA in vivo.
ADSORPTION OF PHENOLS ONTO MACRORETICULAR RESIN PARTICLES
Kim, Hyung Jun,Lee, Sung Sik,Sohn, Jin Eon,Furuya, Eiji,Takeuchi, Yasushi,Noll, Kenneth E,Yamashita, Seiichi 한국화학공학회 1996 Korean Journal of Chemical Engineering Vol.13 No.4
Experimental uptake curves were collected by a shallow bed technique at 298.2 K. Adsorbent particles emploved were macroreticular (MR) resins and adsorbates were phenol and its derivatives. From the uptake curves and equilibrium data obtained by the so-called, batch bottle technique, equilibrium and kinetic parameters were determined and the effects of functional groups within both adsorbate molecules and adsorbent particles on those parameters are discussed. From the results, it became clear that physical and chemical properties, surface area of adsorbent functional group, and solubility of adsorbates affected adsorption equilibria. Also, nitro-functional groups seemed to hinder adsorption equilibria and kinetics. Results can be explained by the resonance effects of functional groups.