광촉매는 물에서 유기 염료를 분해하는 친환경적 기술이다. 산화텅스텐은 이산화 티타늄에 비해 더 작은 밴드갭을 지니고 있어 광촉매 나노물질로서 활발히 연구되고 있다. 계층적 구조의 합성, 백금 도핑, 나노 복합물 또는 다른 반도체와의 결합 등이 광촉매 분해 효율을 향상시키는 방법들로 연구되고 있다. 이들 방법들은 광 파장의 적색편이를 유도하여 전자 이동, 전자-정공 쌍의 형성과 재결합에 영향을 미친다. 산화 텅스텐의 형태 개질을 통해 앞서 언급한 광촉매 분해 효율을 향상시키는 방법들과 합성에 대해 분석하였으며 금속 산화물과 탄소 복합재를 결합하는 방법이 새로운 물질의 합성이 필요없으며 가장 효율적인 방법으로 조사되었다. 이러한 광촉매 기술은 수처리 분리막기술과 모듈화하여 정수처리 목적으로 사용될 수 있다.
광촉매는 물에서 유기 염료를 분해하는 친환경적 기술이다. 산화 텅스텐은 이산화 티타늄에 비해 더 작은 밴드갭을 지니고 있어 광촉매 나노물질로서 활발히 연구되고 있다. 계층적 구조의 합성, 백금 도핑, 나노 복합물 또는 다른 반도체와의 결합 등이 광촉매 분해 효율을 향상시키는 방법들로 연구되고 있다. 이들 방법들은 광 파장의 적색편이를 유도하여 전자 이동, 전자-정공 쌍의 형성과 재결합에 영향을 미친다. 산화 텅스텐의 형태 개질을 통해 앞서 언급한 광촉매 분해 효율을 향상시키는 방법들과 합성에 대해 분석하였으며 금속 산화물과 탄소 복합재를 결합하는 방법이 새로운 물질의 합성이 필요없으며 가장 효율적인 방법으로 조사되었다. 이러한 광촉매 기술은 수처리 분리막기술과 모듈화하여 정수처리 목적으로 사용될 수 있다.
Photocatalysis is an environment friendly technique for degrading organic dyes in water. Tungsten oxide is becoming an active area of research in photocatalysis nanomaterials for having a smaller bandgap than the previously favored titanium dioxide. Synthesis of hierarchical structures, doping plati...
Photocatalysis is an environment friendly technique for degrading organic dyes in water. Tungsten oxide is becoming an active area of research in photocatalysis nanomaterials for having a smaller bandgap than the previously favored titanium dioxide. Synthesis of hierarchical structures, doping platinum (Pt), coupling with nanocomposites or other semiconductors are investigated as valid methods of improving the photocatalytic degradation efficiency. These impact the reaction by creating a redshift in the wavelength of light used, effecting charge transfer, and the formation/recombination of electron-hole pairs. Each of the methods mentioned above are investigated in terms of synthesis and photocatalytic efficiency, with the simplest being modification on the morphology of tungsten oxide, since it does not need synthesis of other materials, and the most efficient in photocatalytic degradation being complex coupling of metal oxides and carbon composites. The photocatalysis technology can be incorporated with water purification membrane by modularization process and applied to advanced water treatment system.
Photocatalysis is an environment friendly technique for degrading organic dyes in water. Tungsten oxide is becoming an active area of research in photocatalysis nanomaterials for having a smaller bandgap than the previously favored titanium dioxide. Synthesis of hierarchical structures, doping platinum (Pt), coupling with nanocomposites or other semiconductors are investigated as valid methods of improving the photocatalytic degradation efficiency. These impact the reaction by creating a redshift in the wavelength of light used, effecting charge transfer, and the formation/recombination of electron-hole pairs. Each of the methods mentioned above are investigated in terms of synthesis and photocatalytic efficiency, with the simplest being modification on the morphology of tungsten oxide, since it does not need synthesis of other materials, and the most efficient in photocatalytic degradation being complex coupling of metal oxides and carbon composites. The photocatalysis technology can be incorporated with water purification membrane by modularization process and applied to advanced water treatment system.
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제안 방법
The solution consists of Na2WO4⋅2H2O, NaCl, HCl mixed in deionized water. In this article, tungsten oxide was fabricated into a 3D architecture consisting of 1D nanorods, which is efficient in degradation of rhodamine B (RhB) under UV-light. Measurements were conducted for samples WO3-1.
1). The photodegradation efficiency was tested for RhB in UV-light and divided by the BET surface area, so as to eliminate the effects of surface area and make a comparison based on the effects of photoinduced charges. Photodegradation efficiency of WO3-1.
3% Rh B were degraded with bare WO3 nanofibers and TiO2 under the same condition. This research is important since they used graphene film. It was powder in previous researches that showed significant photocatalytic ability.
대상 데이터
The diameter of MWCNTs was measured as 15~30 nm and the spherical WO3 particles were shown on planar WO3 and tubular MWCNTs. The TEM showed the circular WO3 and tubular MWCNTs. The result showed the pure MWCNTs had poor photodegradation ability.
이론/모형
In another report, graphene oxide (GO), tungsten oxide (W18O49) nanowires, and tungsten oxide-reduced graphene oxide (W18O49-RGO) aerogel was used to compare the degradation of six organic dyes, Rhodamine B, reactive black 39, reactive yellow 145, weak acid black BR, methyl orange (MO), and weak acid yellow G[11]. GO was synthesized by a modified Hummers method. W18O49 nanowires and W18O49-RGO were synthesized by solvothermal process with heating them at 200°C for 12 hr.
were used to compare the degradation efficiency of methylene blue (MB) dye under UV-Vis light[16]. WO3 nanosheets, ZnS NPs and ZnS-WO3 nanosheet were synthesized by hydrothermal method, precipitation method and wet impregnation method, respectively. The HRTEM images showed the morphology of WO3.
성능/효과
According to HRTEM, few-layered g-C3N4 sheets are strongly coupled with well crystallized W18O49 NRs of diameter 8~10 nm that are uniformly distributed on them. The g-C3N4/W18O49 NC showed higher adsorption and photodegradation efficiency for methylene blue (MB) and methyl orange (MO) than for the g-C3N4 sheets and W18O49 NRs, with a removal efficiency of 99.14% in the dark and 99.91% including photocatalysis in the case of MB. The higher adsorption capacity of W18O49 NRs and g-C3N4/W18O49 NC for MB than g-C3N4 is attributed to the existence of unique crystal defects in W18O49.
Also, the particle sizes of the Pt were up to 10 nm and WO3’s particle sizes were 20~50 nm. The result of the experiment showed that the photodegradation ability of mesoporous Pt/WO3, WO3-GO and Pt/WO3-GO were much greater than bare WO3. Especially, mesoporous Pt/WO3-GO had 3, 2 and 1.
The photocatalysis were conducted with 87% of MO during 120 minutes and 99% of Rh B during 50 minutes under visible light. The result showed 8% of Sn-WO3/ g-C3N4 had the highest photodegradation effi- ciency. Sn-WO3 and g-C3N4 had poor photodegradation efficiency and WO3/g-C3N4 showed better efficiency than previous two materials.
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