• Title/Summary/Keyword: rhodamine-B

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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
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    • v.34 no.2
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    • pp.175-182
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    • 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.

Direct Synthesis of Au/TiO2/graphene Composites and Their Application for Degradation of Various Organic Dyes (그래파이트로부터 직접 제조한 Au/TiO2/그래핀 복합체와 이를 이용한 염료의 광분해에 관한 연구)

  • Jeong, Gyoung Hwa;Kim, Sang-Wook
    • Applied Chemistry for Engineering
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    • v.31 no.6
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    • pp.607-611
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    • 2020
  • In this research, we synthesized Au/TiO2/graphene composites using ionic surfactants for the exfoliation of graphite layers, directly. In the graphene composite, TiO2 with thin nanosheet shapes was distributed on the graphene surface and Au nanoparticles with less than 10 nm sizes were evenly distributed on the surface of the TiO2 nanosheets. The Au/TiO2/graphene composite was then applied to the photodegradation of various dyes such as methylene blue, methylene orange and rhodamine 6G, and B. Among them, the methylene blue showed the most excellent photodegradation activity (91.6%) while the rhodamine B exhibited 31.0%.

pH Dependence on the Degradation of Rhodamine B by Fe-ACF/$TiO_2$ Composites and Effect of Different Fe Precursors (Fe-ACF/$TiO_2$ 복합체에 의한 로다민 B 용액의 분해에 있어서 pH 의존성 및 여러 가지 Fe 전구체의 효과)

  • Zhang, Kan;Oh, Won-Chun
    • Elastomers and Composites
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    • v.44 no.4
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    • pp.408-415
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    • 2009
  • Iron-loaded activated carbon fibers (Fe-ACF) supported titanium dioxide ($TiO_2$) photocatalyst (Fe-ACF/$TiO_2$) was synthesized using a sol-gel method. Three different types of Fe-ACF/$TiO_2$ were obtained by treatment with different precursor of Fe, and characterized using BET, SEM, XRD and EDX analysis. The photocatalytic activity of Fe-ACF/$TiO_2$ was investigated by the degradation of Rhodamine B (Rh.B) solution under UV irradiation. From the experimental results, it was revealed that Fe-ACF/$TiO_2$ composites show considerable photocatalytic ability for the removal of Rh.B by comparing non-treated ACF/$TiO_2$ composites. And photo-Fenton reaction with Fe element was incoordinately influenced due to different precursor of Fe. It clearly indicates that Fe-ACF/$TiO_2$ composites prepared using $FeCl_3$ provided the highest photo-Fenton activity, then, which was affected by pH changes on the degradation of Rh.B.

Photo-catalytic Degradation on B-, C-, N-, and F Element co-doped TiO2 under Visible-light Irradiation (B, C, N, F 원소 다중도핑된 TiO2의 가시광 광촉매 분해 반응)

  • Bai, Byong Chol;Im, Ji Sun;Kim, Jong Gu;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.21 no.1
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    • pp.29-33
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    • 2010
  • In this study, boron, carbon, nitrogen and fluorine co-doped $TiO_{2}$ photocatalysts using tetraethylammonium tetrafluoroborate (TEATFB) have been prepared by different heat treatment temperatures to decrease the band gap. To explore the visible light photocatalytic activity of the novel low‐zband gap $TiO_{2}$ photocatalyst, the removal of two dyes was investigated, namely, acridine orange and rhodamine B. XRD patterns demonstrate that the samples calcined at temperatures up to $800^{\circ}C$ clearly show anatase peaks. The XPS results show that all the doped samples contain N, C, B and F elements and the doped $TiO_{2}$ shows the shift in the band gap transition down to 2.98 eV as UV-DRS results. In these UV-Vis results, photocatalytic activity of the doped $TiO_{2}$ is 1.61 times better than undoped $TiO_{2}$. Specially, excellent photoactivity results were obtained in the case of samples treated at $700^{\circ}C$.

Effects of Operating Parameters on Electrochemical Degradation of Rhodamine B and Formation of OH Radical Using BDD Electrode (BDD 전극을 이용한 OH 라디칼 생성과 염료 분해에 미치는 운전인자의 영향)

  • Park, Young-Seek;Kim, Dong-Seog
    • Journal of Environmental Science International
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    • v.19 no.9
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    • pp.1143-1152
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    • 2010
  • The purpose of this study is to degradation of Rhodamine B (RhB, dye) and N, N-Dimethyl-4-nitrosoaniline (RNO, indicator of the electro-generation of OH radical) in solution using boron doped diamond (BDD) electrode. The effects of applied current (0.2~1.0 A), electrolyte type (NaCl, KCl, and $Na_2SO_4$) and electrolyte concentration (0.5~3.0 g/L), solution pH (3~11) and air flow rate (0~4 L/min) were evaluated. Experimental results showed that RhB and RNO removal tendencies appeared with the almost similar thing, except of current. Optimum current for RhB degradation was 0.6 A, however, RNO degradations was increased with increase of applied current. The RhB and RNO degradation of Cl type electrolyte were higher than that of the sulfate type. The RhB and RNO degradation were increased with increase of NaCl concentration and optimum NaCl dosage was 2.5 g/L. The RhB and RNO concentrations were not influenced by pH under pH 7. Optimum air flow rate for the oxidants generation and RhB and RNO degradation were 2 L/min. Initial removal rate of electrolysis process was expressed Langmuir - Hinshelwood equation, which is used to express the initial removal rate of UV/$TiO_$2 process.

Fabrication and Characterization of Dissolving Microneedles Containing Lecithin for Transdermal Drug Delivery (레시틴이 함유된 경피 약물전달용 용해성 마이크로니들의 제작과 특성)

  • Choi, Won-Ho;Kim, Bumsang
    • Korean Chemical Engineering Research
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    • v.59 no.3
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    • pp.429-434
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    • 2021
  • The feasibility of lecithin as a material for dissolving microneedles to improve skin permeability of drugs and the effect of the composition of lecithin on the mechanical strength, solubility, and skin permeability of rhodamine B (RhB) of the dissolving microneedles were investigated. Dissolving microneedles with needles of uniform shape and size were fabricated with the mold made using the laser-writing technique, simpler and more efficient method compared to the photolithography method, the conventional method to fabricate the microneedle mold. The composition of lecithin in the microneedle affected the mechanical strength and solubility of the needle thus, the mechanical strength of the needle increased as the composition of lecithin in the needle increased, resulting in improving the skin permeability of RhB contained in the microneedles. When comparing the microneedles containing same composition of amylopectin (AP), the skin permeability of RhB of the microneedles containing lecithin was higher. These results indicate that lecithin can be used as a material for dissolving microneedles and the skin permeability of the microneedle could be controlled by changing the composition of lecithin.

Titanium Dioxide 유동층 반응기를 이용한 염료 분해

  • 김지혜;이태경;나영수;김도한;송승구
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2000.05a
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    • pp.63-64
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    • 2000
  • 공기중이나 UV 등의 광원에 비교적 안정적인 염료 Rhodamine B는 UV 조사아래 광촉매인 $TiO_2$의 첨가로 그 분해가 가능하였다. 유동층 반응기에 적합하도록 자체 제조된 광촉매 입자, Photomedia도 우수한 효율로 염료의 분해가 가능함을 보여주었다.

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"Turn-on" type colorimetric/fluorimetric probe for selective detection of Cu2+ at neutral pH condition

  • Lee, Hyun Jung;Saleem, Muhammad;Lee, Ki Hwan
    • Rapid Communication in Photoscience
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    • v.4 no.4
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    • pp.88-90
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    • 2015
  • The design and development of fluorescent chemosensors have recently been intensively explored for sensitive and specific detection of environmentally and biologically relevant metal ions in aqueous solution and living cells. Herein, we report the photophysical results of rhodamine B based fluorogenic and chromogenic receptor for selective copper detection in the complete organic or mixed aqueous-organic media at neutral pH under ambient condition. The ligand exhibited the remarkable increment in the fluorescence emission and UV-visible absorption signal intensities at 587 and 547 nm, respectively, on induction of copper ion while the ligand solution remain completely silent on addition of varieties of other metal ions.

Photocatalytic Degradation of Rhodamine B Using Cd0.5Zn0.5S/ZnO Photocatalysts under Visible Light Irradiation (가시광선하에서 Cd0.5Zn0.5S/ZnO 광촉매를 이용한 로다민 B의 광분해 반응)

  • Lee, Hyun Jung;Jin, Youngeup;Park, Seong Soo;Hong, Seong Soo;Lee, Gun Dae
    • Applied Chemistry for Engineering
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    • v.26 no.3
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    • pp.356-361
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    • 2015
  • $Cd_{0.5}Zn_{0.5}S/ZnO$ composite photocatalysts were synthesized using the precipitation method and characterized by XRD, UV-vis DRS, PL and FE-SEM. Photocatalytic activities of the materials were evaluated by measuring the degradation of rhodamine B under visible light irradiation. Contrary to ZnO, $Cd_{0.5}Zn_{0.5}S/ZnO$ materials absorb visible light as well as UV and their absorption intensities in visible region increased with increasing the $Cd_{0.5}Zn_{0.5}S$ amount. The increment in the $Cd_{0.5}Zn_{0.5}S$ content in $Cd_{0.5}Zn_{0.5}S/ZnO$ also leads to reducing the particle size and consequently increasing the specific surface area. $Cd_{0.5}Zn_{0.5}S/ZnO$ materials with the larger $Cd_{0.5}Zn_{0.5}S$ content showed the higher activity in the photocatalytic degradation of rhodamine B under visible light irradiation. Therefore, the heterojunction effect between $Cd_{0.5}Zn_{0.5}S$ and ZnO as well as the adsorption capacity seems to give important contributions to the photocatalytic activity of the $Cd_{0.5}Zn_{0.5}S/ZnO$.

현장추적자시험에 의한 폐기물매립장 침출수 유출경로 규명

  • 강동환;정상용;이광열;김병우;김태형
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.04a
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    • pp.63-66
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    • 2004
  • 폐기물매립장에서의 침출수 유출을 확인하고 경로를 파악하기 위해 추적자시험이 실시되었다. 추적자는 요오드와 Rhodamine WT를 이용하였으며, 추적자는 T-2, 4, 5공에서 주입하였다. 관측지점으로는 매립장내 우수관 출구와 측면배수구에서 모니터링 하였으며, 또한 주입공 하부의 9개 지하수공에서 모니터링 하였다. T-4, T-2와 T-5 지하수공에서 요오드와 Rhodamine WT 용액을 주입한 추적자시험 결촤 매립장의 바닥 차수막이 파손되어 침출수가 우수관내로 유출되고 있음이 입증되었으며, 또한 매립장내의 투수성이 매우 높아 일반적인 자연상태에 비해 매립장에서 우수관내로의 침출수 유입이 매우 빠름을 알 수 있었다. T-4와 T-2 지하수공에서 실시된 추적자시험에서 매립장의 차수벽 하부에 위치한 B-5와 B-6공에서 다량의 추적자가 관측되어 하부차수벽을 통해 침출수가 유출되고 있음이 확인되었다. 본 현장에서 실시된 추적자시험을 통해 매립장에서의 침출수 유출은 매우 빠른 속도로 발생하고 있으며, 또한 주 유출경로로는 T-4와 T-5 지하수공 주변의 바닥차수막과 매립장의 하부차수벽을 통해 유출 되어지고 있음을 확인할 수 있었다.

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