• Title, Summary, Keyword: hydrogen peroxide

Search Result 2,013, Processing Time 0.042 seconds

A clean technology development using the molybdenum dissolution reaction with hydrogen peroxide/UV/Ozone ($오존/UV/H_2O_2$를 이용한 몰리브덴(Mo) 용해 반응에 따른 청정기술 개발에 관한 연구)

  • 김재우;홍종순;신대윤
    • Journal of environmental and Sanitary engineering
    • /
    • v.14 no.4
    • /
    • pp.143-149
    • /
    • 1999
  • In the tungsten industry as light source material, tungsten filament which used as light source material could form after molybdenumwire which used as the center supporter for coil shape tungsten wire was removed. This process uses hydrogen peroxide, Ozone and UV(Ultraviolet)Lamp, for the quantity of hydrogen peroxide decrease. The results were as follows : 1. An incandescent electric Lamp type : FL(FL-20) type : A standard of commodity (P.W.: $19{\pm}1.0mg$, $C.R:4.5{\pm}0.3{\Omega}$) 1) Only hydrogen peroxide treated ; Reaction Time : 65Min., P.W.: 18.60mg, $C.R.:4.60{\Omega}$ 2) Ozone/Ultraviolet/70% of hydrogen peroxide; Reaction Time : 64Min., P.W.: 18.61mg, C.R.: $4.61{\Omega}$ 2. A Fluorescent Lamp Type : GLS(GLS-40) Type : A standard of commodity(P.W.: $11.8{\pm}0.2mg$$65{\pm}1.5{\Omega}$) 1) Only hydrogen peroxide treated ; Reaction Time: 72Min, P.W.:11.88mg, C.R.: $65.62\Omega$ 2) Ozone/Ultraviolet/70% of hydrogen peroxide;Reaction Time:71Min., P.W.:11.88mg, C.R.: $65.63\Omega$

  • PDF

Hydrogen Peroxide Generation of DSA for Electro-Fenton Reaction and Removal of Rhodamine B (Electro-Fenton 반응을 위한 불용성 전극의 과산화수소 생성과 Rhodamine B의 제거)

  • Kim, Dong-Seog;Park, Young-Seek
    • Journal of Environmental Health Sciences
    • /
    • v.34 no.2
    • /
    • pp.175-182
    • /
    • 2008
  • This study investigates the optimal conditions for electrogenerated hydrogen peroxide production and the application of the electro-Fenton process using DSA electrodes. The influences of parameters for the hydrogen peroxide generation such as electrode materials, electrolyte concentration, current, pH, air flow rate and electrode distance were investigated using a laboratory scale batch reactor. The relative performance for hydrogen peroxide generation of each of the six electrodes is : Ru-Sn-Ti > Ru-Sn-Sb > Ru > Ir > Pt > Sn-Sb. Optimum NaCl dosage, current and air flow rate were 2.0 g/l, 12.5 A and 2 l/min, respectively. When the pH is low, hydrogen peroxide concentration was high. Electrode distance dos not effect to a hydrogen peroxide generation. A complete color removal was obtained for RhB (200 mg/l) at the 8 min mark of the electro-Fenton process under optimum operation conditions of $Fe^{2+}$ 0.105 g/l and 5.0 A. The electro-Fenton process increased initial reaction and decreased final reaction time. However the effect was not high.

Vacuum Distillation of Rocket Grade Hydrogen Peroxide with Temperature (온도 조건에 따른 추진제급 과산화수소의 진공 증류)

  • Chung, Seung-Mi;An, Sung-Yong;Kwon, Se-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • /
    • pp.89-92
    • /
    • 2009
  • Because many research using concentrated hydrogen peroxide as propellant is studied, research for distillation method for domestic production of rocket grade hydrogen peroxide is needed. To distill hydrogen peroxide, vacuum distillation will be used because of heat decomposition of hydrogen peroxide. Distillation pressure is 30 torr which is determined by Raoult's law to distill under $40^{\circ}C$. Variable of distillation experiment is distillation temperature. And the comparison of distillation results was done by yield and operation time. In the result, generally, yield was lower and the water in receiver had higher concentration with shorter distillation time. And with similar time, when distillation temperature was higher, yield was lower and hydrogen peroxide became higher concentration.

  • PDF

Properties of Bleachability of Paper Mulberry Pulp by Hydrogen Peroxide and Ultrasonication Bleaching System (과산화수소와 초음파 표백 시스템에 따른 닥나무 펄프의 표백 효율 특성)

  • Seo, Jin-Ho;Kim, Hyoung-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.44 no.1
    • /
    • pp.65-73
    • /
    • 2012
  • Nowadays, the concern on the environmental load of bleaching process gave rise to the process of ECF(elemental chlorine free) and TCF(total clorine free). These sequences are based on oxygen-derived compounds such as oxygen, ozone, and hydrogen peroxide which is used as a typical eco-friendly bleaching agent. In this study, paper mulberry pulp was bleached with hydrogen peroxide and some bleaching process were accompanied with ultrasonication in order to increase the bleaching efficiency. The best bleaching efficiency of paper mulberry pulp was obtained in the condition of hydrogen peroxide and ultrasonication(20 kHz) bleaching system at $45^{\circ}C$ for 30 min. The brightness and kappa number of paper mulberry pulp were gained to 5.09% and 3.52 respectively. and yield was slightly loosed to 2%. Therefore, the efficiency of hydrogen peroxide and ultrasonication bleaching system of paper mulberry pulp was superior to the conventional hydrogen peroxide bleaching system. Magnesium sulfate acted as a bleaching stabilizer for the increasement of yield. As a result, the yield and viscosity were increased to 2.2% and 12% respectively.

Effect on the Hydrogen Peroxide in the Ozonation of Ammonia (오존에 의한 암모니아 산화시 과산화수소가 미치는 영향)

  • 박문숙;안재동;노봉오
    • Journal of Environmental Health Sciences
    • /
    • v.27 no.1
    • /
    • pp.1-7
    • /
    • 2001
  • Ammonia is used in the manufacture of fertilizers, refrigerants, stabilizers and many household cleaning agents. These wide applications resulted in ammonia contamination in water. Ammonia can be removed from water by physical, biological, and chemical methods. Ozonation is effictive in the treatment of water with low concentration of ammonia. This study is undertaken to provide kinetic data for the ozonation of ammonia with or without hydrogen peroxide. The results were as follows; The destruction rate of ammonia increased gradually with the influent hydrogen peroxide concentration up to 0.23 mM and inhibited in the range of 0.23~11.4mM, and the maximum removal rate of ammonia achieved at 0.23mM of hydrogen peroxide, and the overall kinetics was first order. The combination effect of hydrogen and ozone to oxide ammonia in aqueous solution was better than ozone alone. The reacted ammonia was converted completely to nitrate ion.

  • PDF

Effect of brazilin on phosphatase activity in isolated rat epididymal adipocytes

  • Lee, Yong-Khil;So, Dhong-Soo;Moon, Chang-Kiu
    • Proceedings of the Korean Society of Applied Pharmacology
    • /
    • /
    • pp.218-218
    • /
    • 1996
  • Brazilin은 포도당 수송을 증가시키는 물질로 autooxidation에 의하여 산화되면서 hydrogen peroxide를 생성할 것으로 추정되었으며, hydrogen peroxide는 phosphatase를 억제하여 포도당 수송을 증가시키는 것으로 보고되었다. 따라서 본 실험에서 brazilin의 산화에 의한 hydrogen peroxide의 생성여부를 확인하고 phosphatase 활성에 미치는 braziline의 작용을 살펴보았다. 먼저 UV absorption spectra를 이용하여 brazilin이 반응액중에서 구조적인 변화를 일으키는지 확인하였다. Hydrogen peroxide의 생성은 rhodamine 123를 이용한 형광측정법으로 측정하였으며, phosphatase의 활성은 pH에 따른 phosphatase의 활성을 p-NPP의 탈인산화의 UV 흡광도 변화로 측정하였다. PP2A의 활성은 phosphorylase a를 기질로 하여 측정하였다.

  • PDF

Effects of Hydrogen Peroxide Concentration on the Polymerization of p-Phenylphenol in Organic Solvent by Peroxidase

  • Yoo, Young-Je;Yeo, Joo-Sang;Park, Tae-In
    • Journal of Microbiology and Biotechnology
    • /
    • v.5 no.3
    • /
    • pp.177-180
    • /
    • 1995
  • In horseradish peroxidase-catalyzing polymerization of phenol under the water/dioxane solvent system, the optimal concentration of hydrogen peroxide was found to be 10 mmol/I. Feeding of hydrogen peroxide at its optimal concentration improved the polymerization performance by reducing reaction time and increasing molecular weights. Monomer conversions and the molecular weights of the enzymatically produced polymer were in the ranges of 83.1~94.2$%$ and 58000~68000, respectively.

  • PDF

Profile Analysis of Proteins Related with Hydrogen Peroxide Response in Strep-tomyces coelicolor (Muller) (Streptomyces coelicolor (Muller)의 과산화수소 대응 반응에 관련된 단백질 양상의 분석)

  • 정혜정;노정혜
    • Korean Journal of Microbiology
    • /
    • v.31 no.2
    • /
    • pp.166-174
    • /
    • 1993
  • Streptomyces coeUc%r (Muller) cells were treated with $100 \mu$M hydrogen peroxide for I hour and proteins synthesized during hydrogen peroxide stress were labeled with L-[$^{35}S$]-methionine. Total cellular proteins were extracted and analyzed by two-dimensional polyacrylamide gel electrophoresis. In exponential growth phase, synthesis of about 100 proteins was increased by hydrogen peroxide treatment. These proteins were named as Pin (£eroxide-inducib]e) proteins and classified into 4 subgroups according to their induction time after hydrogen peroxide treatment. About 60 of them were found to be induced within 20 minutes and maintained throughout I hour of treatment. In stationary growth phase. synthesis of 62 proteins was increased by hydrogen peroxide and 21 of them were the same Pins found in exponential growth phase. Proteins from the mutants which are resistant to hydrogen peroxide were obtained in exponential growth phase and compared with those from the wild type on two-dimensional gel. The three mutants, N7, N9. and N24, were found to have higher constitutive leve]s of ]5, 17, and 15 Pin proteins respectively, than the wild type. 9 of these Pin proteins (D74.7a, E76.0c, E23.3. F50.7, F47.2a. F25.5, G39.6b, G24.0, H39.6a) increased in two of the three mutants and 3 proteins (F39.7, H6I.7. 120.8) increased in all of the three mutants. These proteins might play important roles in the response of S. coelic%r to hydrogen peroxide.

  • PDF

Effect of Mixture of p-Phenylenediamine with Hydrogen Peroxide to Rat Skin (p-Phenylenediamine과 과산화수소 혼합액 도포가 흰쥐 피부조직에 미치는 영향)

  • Lee, Sang-Hee;Lee, Sang-Il
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.35 no.8
    • /
    • pp.1010-1015
    • /
    • 2006
  • p-Pheylenediamimine (PPD) is one of hair dye's ingredients, and the mixture of PPD with hydrogen peroxide is generally used to dye hair at beauty shop. This study is conducted to investigate the effect of oxidized PPD on rat skin. 6% hydrogen peroxide, PPD (5% PPD in 2% $NH_4OH$) or the mixture (isovolumed mixture of 5% PPD and 6% hydrogen peroxide in 2% $NH_4OH$) was applied to rat skin ($25\;mg/16.5\;cm^2$) five times every other day. The activity of acid phosphatase (ACP) was more increased in the mixture of PPD with hydrogen peroxide applied group than PPD applied group. Furthermore, the activity of glucose 6-phosphatase (G6Pase) in the mixture of PPD with hydrogen peroxide applied group showed higher decreasing rate than that of PPD applied group. In histopathological findings, the mixed PPD with hydrogen peroxide applied group showed more thickening of epithelium, increased numbers of dermal fibroblasts, and the dilatation of dermal capillaries than PPD applied group. The significant increasing of xanthine oxidase (XO) activity was determined in mixture of PPD with hydrogen peroxide applied group compared with PPD applied group. However, reactive oxygen species (ROS) scavenging system, the activities of superoxide dismutase (SOD) and glutathione S-transferase (GST) were more significantly decreased in mixed PPD with hydrogen peroxide applied groups than in PPD applied group. In conclusion, topical application with the mixture of PPD with hydrogen peroxide compared with PPD application resulted in imbalance with ROS generating and scavenging which probably led to severe skin injury.

Effect of Hydrogen Peroxide on Pretreatment of Oakwood in a Percolation Process (Percolation 공정에서 참나무의 전처리에 과산화수소가 미치는 영향)

  • 하석중;김성배;박순철
    • KSBB Journal
    • /
    • v.14 no.3
    • /
    • pp.358-364
    • /
    • 1999
  • The effect of hydrogen peroxide on pretreatment of oakwood was investigated. Reaction temperature was $170^{\circ}C$ and reaction solutions used in pretreatment were aqueous ammonia, sulfuric acid and pure water. When 10% ammonia solution was used, the extents of delignification and hemicellulose recovery were 55% and 26%, respectively. These values were significantly higher as delinigfication and lower as hemicellulose recovery than those of acid hydrolysis. To overcome this problem, hydrogen peroxide was added into ammonia solution stream to increase hemicellulose recovery. But delignification and hemicellulose recovery were not increased as much as hydrogen peroxide loading was increased. And as hydrogen peroxide loading was increased, the decomposition of sugars solubilized from hemicellulose and cellulose were increased. So there were significant differences between the total amount in solid residue and liquid hydrolyzate, and the total amount in the original biomass. It was found that hydrogen peroxide added was reacted with substrate packed mostly in the front part of reactor. In order to increase hemicellulose recovery, it was necessary to treat with acidic solution than with alkali solution. Effect of hydrogen peroxide was higher in water than acid solution.

  • PDF