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Photocatalytic degradation of acesulfame K: Optimization using the Box–Behnken design (BBD)
Nam, Seong-Nam,Cho, Hyekyung,Han, Jonghun,Her, Namguk,Yoon, Jaekyung Elsevier 2018 PROCESS SAFETY AND ENVIRONMENTAL PROTECTION Vol.113 No.-
<P><B>Abstract</B></P> <P>In this research, photocatalytic degradation of acesulfame K, one of the most popular artificial sweeteners, has been carried out under variations of the initial concentration, pH, concentration of persulfate, and amount of natural organic matter (NOM). The removal efficiencies for 30-min, 60-min and 180-min reaction time have been applied to response surface methodology using the experimental responses obtained by a four-factor-three-level Box–Behnken design (BBD). This provided 29 experimental data for the initial concentration of acesulfame K ranging from 300 to 900μg/L, pH of solution ranging from 4 to 10, persulfate concentration ranging from 0 to 10mg/L, and amount of natural organic matter (NOM) ranging from 0 to 5mg/L, which were consecutively coded as A, B, C, and D at three levels (−1, 0, and 1). The analysis of variance (ANOVA) tests with 95% confidence limits determined the significance of independent variables and their interactions consisting of the polynomial regression equation. The optimum values of the selected variables were determined by numerical optimization, and the experimental conditions were found to reach complete mineralization for 30min and thereafter, at initial concentration of 887.2μg/L; pH of 4; persulfate concentration of 9mg/L, and NOM concentration of 5mg/L.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Response surface methodology was applied to photocatalytic degradation of acesulfame. </LI> <LI> Independent variables (C<SUB>o</SUB>, pH, persulfate and NOM) were coded at three levels (−1, 0 and 1). </LI> <LI> A second-order polynomial regression model was derived to predict responses based on 30 experiments. </LI> <LI> Linear terms of the model showed the highest contribution. </LI> </UL> </P>
韓相燮,許南鎭,朴完根,李明鐘 江原大學校 森林科學硏究所 1999 Journal of Forest Science Vol.15 No.-
이 연구는 우리나라 주요 산채 수종인 두릅나무에 대하여 기건 보관한 종자와 냉장 보관(4℃)한 종자의 발아율 특성을 여러 광 조건(상대조도 0%, 30%, 50%, 70%, 100%)하에서 비교하였다. 조사 결과 모든 처리구에서 발아율이 70% 이상으로 나타났으며, 상대조도 0%에서 기건보관한 종자가 88%, 냉장보관한 종자가 82%로 가장 높은 발아율을 나타냈다. 그러나 발아된 종자 중 유근의 생존율은 각각 16%와 21%로 낮은 반면, 상대조도 100%의 처리구에서는 기건보관종자가 90%, 냉장보관한 종자가 99%로 높은 생존율을 보였다. This study was carried out in various light treatments(relative light intensity 0%, 30%, 50% , 70% and 100%) to compare the characteristics of germination of Aralia elata seeds that were kept under room air temperature and refrigerator storage (4℃) . The germination percentage was equal to or more than 70% in all light treatments. The maximum germination percentage of seeds stored in room air temperature and refrigerator were 88% and 82% at the dark condition, respectively. The survival rates of radicle of the germinated seeds were 16% and 21% at the dark condition but were 90% and 99% at the 100% light condition.
Removal of Perchlorate Using Reverse Osmosis and Nanofiltration Membranes
Jong Hun Han,Choong Sik Kong,Ji Yong Heo,Yeo Min Yoon,Hee Bum Lee,Nam Guk Her 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.4
Rejection characteristics of perchlorate (ClO₄ -) were examined for commercially available reverse osmosis (RO) and nanofiltration (NF) membranes. A bench-scale dead-end stirred-cell filtration system was employed to determine the toxic ion rejection and the membrane flux. Model water solutions were used to prepare ClO₄- solutions (approximately, 1,000 ug/L) in the presence of background salts (NaCl, Na₂SO₄, and CaCl₂) at various pH values (3.5, 7, and 9.5) and solution ionic strengths (0.001, 0.01, and 0.01 M NaCl) in the presence of natural organic matter (NOM). Rejection by the membranes increased with increasing solution pH owing to increasingly negative membrane charge. In addition, the rejection of the target ion by the membranes increased with increasing solution ionic strength. The rejection of ClO₄- was consistently higher for the RO membrane than for the NF membrane and ClO₄ - rejection followed the order CaCl₂ < NaCl < Na₂SO₄ at conditions of constant pH and ionic strength for both the RO and NF membranes. The possible influence of NOM on ClO₄- rejection by the membranes was also explored
Park, Sung-Won,Her, Nam-Yun,Kim, Dong-Seob,Park, Sun-Jin,Lee, Han-Seung,Park, Hak-Jong,Yu, Ju-Hyun The Korean Society of Food Science and Nutrition 1997 Preventive Nutrition and Food Science Vol.2 No.2
CMCase produced by recombinant E. coli JM109 (pCEH#4) containing CMCase gene from Cellulomonas sp. YE-5 was purified to 24.3 fold and 2.6% yield by ammoniumsulfate precipitation, DEAE-cellulose column chromatography and gel filtration on Sephadex G-100. The optimum pH and temperature for CMCase activity were pH 7.0 and 5$0^{\circ}C$. The enzyme was stable between pH 5.0 and 10.0, and up to 6$0^{\circ}C$. The molecular weight of he enzyme was estimated to be approximately 40,000 daltons by SDS-PAGE. Analysis of the amino acid composition showed that the enzyme contained many glycines and acidic amino acids. The enzyme was an endo-type CMCase and the final enzyme reaction product from hydrolysis of Cm-cellulose by the enzyme was cellobiose. {TEX}$K_{M}${/TEX} value determined with CM-cellulose was 1.28mM.
Sung-Won Choi,Nam-Yun Her,Dong-Seob Kim,Sun-Jin Choi,Han-Seung Lee,Hak-Jong Choi,Ju-Hyun Yu 한국식품영양과학회 1997 Preventive Nutrition and Food Science Vol.2 No.2
CMCase produced by recombinant E. coli JM109(pCEH#4) containing CMCase gene from Cellulomonas sp. YE-5 was purified to 24.3 fold and 2.6% yield by ammonium sulfate precipitation, DEAE-cellulose column chromatography and gel filtration on Sephadex G-100. The optimum pH and temperature for CMCase activity were pH 7.0 and 50℃. The enzyme was stable between pH 5.0 and 10.0, and up to 60℃. The molecular weight of the enzyme was estimated to be approximately 40,000 daltons by SDS-PAGE. Analysis of the amino acid composition showed that the enzyme contained many glycines and acidic amino acids. The enzyme was an endo-type CMCase and the final enzyme reaction product from hydrolysis of CM-cellulose by the enzyme was cellobiose. K_M value determined with CM-cellulose was 1.28mM.