• Title/Summary/Keyword: 메틸렌 블루의 광촉매 분해

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Photocatalytic Degradation of Rhodamine B, Methyl Orange and Methylene Blue with CdS and CdZnS/ZnO Catalysts under Visible Light Irradiation (가시광선하에서 CdS와 CdZnS/ZnO 광촉매를 이용한 로다민 B, 메틸 오렌지 및 메틸렌 블루의 광분해 반응)

  • Jeon, Hyun Woong;Jeong, Min Gyo;An, Byeong Yun;Hong, Min Seong;Seong, Sang Hyeok;Lee, Gun Dae
    • Clean Technology
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    • v.26 no.4
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    • pp.311-320
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    • 2020
  • In this study, the photocatalytic degradation of rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) was carried out under visible light irradiation using CdS and CdZnS/ZnO photocatalysts prepared by a simple precipitation method. This study focused on examining the effect of physicochemical properties of dye and photocatalyst on the reaction pathway of photocatalytic degradation. The prepared photocatalysts were characterized by XRD, UV-vis DRS and XPS. Both the CdS and CdZnS/ZnO photocatalysts exhibit an excellent absorption in the visible light and the UV light regions. It was observed that the photocatalytic degradation of MO proceeds via the same reaction mechanism on both the CdS and CdZnS/ZnO photocatalysts. However, the photocatalytic degradation of RhB and MB was found to proceed through a different reaction pathway on the CdS and CdZnS/ZnO catalysts. It is interesting to note that MB dimer was formed on the CdS catalyst at the beginning of the photocatalytic reaction, while the MB monomer was degraded during the overall photocatalytic reaction on CdZnS/ZnO. The above results may be mainly ascribed to the difference of band edge potential of the conduction band in the CdS and CdZnS/ZnO semiconductors and the adsorption property of dye on the catalysts.

Manufacture and Characteristics of Concrete Sidewalk Blocks Using Photocatalyst Agent (광촉매제를 사용한 콘크리트 보도블록의 제조 및 특성)

  • Jung, Yong-Wook;Chang, Chun-Ho;Kim, Jong-Kyu
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.7 no.4
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    • pp.423-430
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    • 2019
  • In this study, the flexural strength, absorption rate, methylene blue photo catalyst decomposition performance and anti-fouling performance were evaluated according to the photo catalyst mixing rate and block surface wash status by applying photo catalyst to the surface layer of concrete sidewalk block. The results showed that the flexural strength of the block that mixed photo catalyst only in the surface layer of the concrete block was 5.32MPa of the general block (SNW) of 5% photo catalyst, compared to 5.46MPa of the non-mixed concrete block of the reference concrete block. Surface washing block (SW) 5.26MPa, 10% photo catalyst general block (SNW) 5.26MPa, and 5.15MPa surface washing block (SW). It has been shown that the presence of surface washing and the mixing rate of photo catalyst in the concrete block have no effect on the flexural strength. Moreover, the photoreaction performance of concrete sidewalk blocks showed that the methylene blue removal rate of specimens with 5% TiO2 was 34.2%, the methylene blue removal rate of specimens with 10% TiO2 was 37.1%, and the removal rate of the methylene blue of specimens with 5% TiO2 was about 37.9% and 10% mixed specimens with TiO2 was about 37.6%.

UV Light-assisted Photocatalytic Degradation of Simluated Methylene blue Dye by Multilayered ZnO Films (다층 ZnO 막에 의한 모의 메틸렌블루 염료의 자외선 광촉매분해)

  • Khan, Shenawar Ali;Zafar, Muhammad;Kim, Woo Young
    • Journal of the Korean Applied Science and Technology
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    • v.39 no.1
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    • pp.34-41
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    • 2022
  • As the use of chemical products increases in daily life, the removal of dye waste has also emerged as an important environmental issue. This dye waste can be decomposed using a photocatalyst, and the photocatalyst can be synthesized very cost-effectively by using the sol-gel technology. The sol-gel technology is not only very useful for nanoscale film formation, but also can simply form multilayer structures. Using a multiple spin coating method, in this study, a ZnO film with a multilayered structure (3 layers, 5 layers) was formed by using zinc oxide (ZnO), which is effective in decomposing various dyes. For performance comparison, a ZnO film having a single layer structure by a single spin coating method was prepared as a control. Structural and elemental analysis of ZnO film was performed using an X-ray diffraction analyzer and an energy dispersive X-ray spectrometer. A nanowire-like surface morphology could be observed through a scanning electron microscope. Additionally, UV-Vis spectrophotometer was used to measure the absorbance of UV light. The ZnO film with a five-layer structure degraded the simulated methylene blue by 49% more than the ZnO film with a single-layer structure. In conclusion, it was found that ZnO having a multilayered structure is useful as a photocatalyst that decomposes methylene blue dye more effectively.

Preparation and Characterizations of Titania Nanotube Thin Films (티타니아 나노튜브(TNT) 박막의 제조 및 특성에 관한 연구)

  • Lee, Youngrok;Jung, Jihoon
    • Korean Chemical Engineering Research
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    • v.49 no.5
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    • pp.652-656
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    • 2011
  • Thin film of titania nanotubes(TNT) and titania nanofilms(TNF) was fabricated by anodizing for the study of the photo-catalytic reaction(PC) and photoelectrocatalytic reaction(PEC). Removal efficiency of methylene blue was investigated by UV radiation on the TNT coated titanium plate. Removal efficiency was increased with longer TNT length. Degradation efficiency of the PEC reaction was less sensitive than that of PC reaction. And Effect of TNT length is relatively small. Titania nanofilms(TNF) showed low efficiency than TNT. The efficiency drop of PC was larger than that of PEC.

Synthesis of TiO2-xNx Using Thermal Plasma and Comparison of Photocatalytic Characteristics (열플라즈마에 의한 TiO2-xNx의 합성 및 광촉매 특성 비교)

  • Kim, Min-Hee;Park, Dong-Wha
    • Applied Chemistry for Engineering
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    • v.19 no.3
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    • pp.270-276
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    • 2008
  • $N_2$ doped $TiO_2$ nano-sized powder was prepared using a DC arc plasma jet and investigated with XRD, BET, SEM, TEM, and photo-catalytic decomposition. Recently the research interest about the nano-sized $TiO_2$ powder has been increased to improve its photo-catalytic activity for the removal of environmental pollutants. Nitrogen gas, reacting gas, and titanium tetrachloride ($TiCl_4$) were used as the raw materials and injected into the plasma reactor to synthesize the $N_2$ doped $TiO_2$ power. The particle size and XRD peaks of the synthesized powder were analyzed as a function of the flow rate of the nitrogen gas. Also, the characteristics of the photo-catalytic decomposition using the prepared powder were studied. For comparing the photo-catalytic decomposition performance of $TiO_2$ powder with that of $TiO_2$ coating, $TiO_2$ thin films were prepared by the spin coating and the pulsed laser deposition. For the results of the acetaldehyde decomposition, the photo-catalytic activity of $TiO_{2-x}N_x$ powder was higher than that of the pure $TiO_2$ powder in the visible light region. For the methylene blue decomposition, the decomposition efficiency of $TiO_2$ powder was also higher than that of $TiO_2$ film.

Microwave-assisted Photocatalytic Degradation of Methylene Blue (마이크로웨이브가 부가된 광촉매에 의한 메틸렌블루의 분해)

  • Kim, Yu-Bong;Jo, A-Ra;Ra, Deog-Gwan;Park, Jae-Hyeon;Kim, Sun-Jae;Jung, Sang-Chul
    • Journal of Korean Society of Environmental Engineers
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    • v.30 no.8
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    • pp.817-822
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    • 2008
  • In this study, the photocatalytic degradation of methylene blue in TiO$_2$ particles-dispersed water solution was carried out by irradiating microwave and UV light simultaneously. A microwave-discharged electrodeless UV lamp was developed to use microwave and UV simultaneously for photocatalytic reactions. The results of photocatalytic degradation of methylene blue showed that the decomposition rate increased with the microwave intensity, the circulating fluid velocity, and the amount of TiO$_2$ particles and auxiliary oxidizing agents added. Especially, the rate constant of H$_2$O$_2$-added photocatalytic reaction increased about three times from 0.0075 min$^{-1}$ to 0.0250 min$^{-1}$ when microwave was additionally irradiated. This study demonstrates that the microwave irradiation can play a very important role in photocatalytic degradation using peroxides although it is not easy to quantitatively assess the effect of microwave on photocatalytic reactions from the experimental data of this study.

The Microwave-assisted Photocatalytic Degradation of Methylene Blue Solution Using TiO2 Balls Prepared by Chemical Vapor Deposition (CVD법으로 제조된 산화티탄 볼과 마이크로웨이브를 이용한 메틸렌블루 수용액의 광촉매분해)

  • Park, Sang-Sook;Park, Jae-Hyeon;Kim, Sun-Jae;Jung, Sang-Chul
    • Korean Chemical Engineering Research
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    • v.46 no.6
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    • pp.1063-1068
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    • 2008
  • The photocatalytic degradation of methylene blue water solution was carried out by irradiating microwave and UV light simultaneously using $TiO_2$ photocatalyst balls prepared by Chemical Vapor Deposition method. A microwave-discharged electrodeless UV lamp was developed to use microwave and UV simultaneously for photocatalytic reactions. The results of photocatalytic degradation of methylene blue showed that the decomposition rate increased with the microwave intensity, the circulating fluid velocity and auxiliary oxidizing agents added. Especially, the rate constant of $H_2O_2$-added photocatalytic reaction increased about three times from $0.0061min^{-1}$ to $0.0197min^{-1}$ when microwave was additionally irradiated. This study demonstrates that the microwave irradiation can play a very important role in photocatalytic degradation using peroxides although it is not easy to quantitatively assess the effect of microwave on photocatalytic reactions from the experimental data of this study.

Preparation of $N-TiO_2$ Photocatalysts and Activity Test ($N-TiO_2$ 광촉매의 제조와 광촉매 활성 검토)

  • Kang, Young-Gu;Shin, Ki-Seok;Ahn, Sung-Hwan;Hahm, Hyun-Sik
    • Journal of the Korean Applied Science and Technology
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    • v.29 no.3
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    • pp.466-472
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    • 2012
  • Visible-light-responding photocatalysts, $N-TiO_2$, were prepared by nitrogen doping onto $TiO_2$. The crystalline structure and morphology, doping state of the prepared photocatalysts were characterized by XRD, FE-SEM, and XPS. The activity of the prepared photocatalysts was examined by the decomposition of methyleneblue. The prepared catalysts were anatase type and the crystallinity was increased with pH. The particle sizes of the prepared catalysts were 5.42, 5.99, 7.58 nm at pH 2.2, 4.7, 9.0, respectively. The particle sizes of the prepared catalysts were slightly increased with pH. The activity of the photocatalysts was directly proportional to the crystallinity of the catalysts. $N-TiO_2$ prepared by nitrogen doping onto $TiO_2$ showed activity under visible light. The doped nitrogen was located not in the lattice but on the surface.

Synthesis and Photodecomposition of N-Doped $TiO_2$ Surface Treated by Ammonia (암모니아 표면처리 된 질소 도핑 $TiO_2$ 광촉매의 합성 및 광분해반응)

  • Kim, Yesol;Bai, Byong Chol;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.23 no.3
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    • pp.308-312
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    • 2012
  • Nitrogen doped $TiO_2$ photocatalysts were prepared by ammonia for exploring the visible light photocatalytic activity. To explore the visible light photocatalytic activity of the nitrogen doped $TiO_2$ photocatalyst, the removal of methylene blue dye was investigated under the sunlight. SEM images showed that the flocculated particle sizes of N-doped $TiO_2$ decreased due to the reaction with ammonia. XRD patterns demonstrated that the samples calcined at temperatures up to $600^{\circ}C$ and doped with nitrogen using ammonia clearly showed rutile as well as anatase peaks. The XPS results showed that the nitrogen composition onto $TiO_2$ increased according to the reaction time with ammonia. Photocatalytic activity of the nitrogen doped $TiO_2$ was better than that of undoped $TiO_2$. Nitrogen doping onto the $TiO_2$ also affected the crystal type of $TiO_2$ photocatalyst.