Fabrication of Fe-ACF/TiO₂ composites and their photonic activity for organic dye

Kan Zhang(장간),Ze-Da Meng(맹칙달),Weon-Bae Ko(고원배),Won-Chun Oh(오원춘) 한국분석과학회 2009 분석과학 Vol.22 No.3

Characterization of Fe-ACF/TiO₂ composite and photocatalytic activity for MB Solution under visible light

Kan Zhang(장간),Ze-Da Meng(맹칙달),Won-Chun Oh(오원춘) 한국분석과학회 2010 분석과학 Vol.23 No.3

Fe-ACF/TiO2 복합체에 의한 로다민 B 용액의 분해에 있어서 pH 의존성 및 여러 가지 Fe 전구체의 효과

장간 ( Kan Zhang ),오원춘 ( Won Chun Oh ) 한국고무학회 2009 엘라스토머 및 콤포지트 Vol.44 No.4

졸-겔 방법을 사용하여 Fe-ACF/TiO2 복합체 광촉매를 제조하였다. 여러 가지 철 전구체를 사용하여 세가지 Fe-ACF/TiO2 복합체를 제조하고 BET, SEM, XRD 및 EDX를 사용하여 특성화 하였다. UV 조사에서 Rh.B용액의 분해에 의거하여 Fe-ACF/TiO2 복합체의 광촉매 특성을 파악 하였다. 실험 결과로부터, Fe-ACF/TiO2 복합체는 ACF/TiO2 복합체 보다 Rh.B의 제거 효과가 더 우수함을 나타내었다. 또한 여러 가지 Fe 전구체 사용으로 인한 Fe 원소의 포토-펜톤 효과는 다르게 나타났다. FeCl3을 사용하여 제조된 Fe-ACF/TiO2 복합체는 가장 우수한 포토-펜톤 효과를 나타내었고, pH 변화에 의존하여 Rh.B 용액 분해에 대하여 영향을 주었다. Iron-loaded activated carbon fibers (Fe-ACF) supported titanium dioxide (TiO2) photocatalyst (Fe-ACF/TiO2) was synthesized using a sol-gel method. Three different types of Fe-ACF/TiO2 were obtained by treatment with different precursor of Fe, and characterized using BET, SEM, XRD and EDX analysis. The photocatalytic activity of Fe-ACF/TiO2 was investigated by the degradation of Rhodamine B (Rh.B) solution under UV irradiation. From the experimental results, it was revealed that Fe-ACF/TiO2 composites show considerable photocatalytic ability for the removal of Rh.B by comparing non-treated ACF/TiO2 composites. And photo-Fenton reaction with Fe element was incoordinately influenced due to different precursor of Fe. It clearly indicates that Fe-ACF/TiO2 composites prepared using FeCl3 provided the highest photo-Fenton activity, then, which was affected by pH changes on the degradation of Rh.B.

Fe-ACF/TiO2 복합체의 특성과 MB용액의 분해에서 포토-펜톤 효과

장간 ( Kan Zhang ),맹칙달 ( Ze Da Meng ),고원배 ( Weon Bae Ko ),오원춘 ( Won Chun Oh ) 한국고무학회 2009 엘라스토머 및 콤포지트 Vol.44 No.3

본 논문에서 Fe-활성탄소 섬유(ACF)/TiO2 복합체 광촉매를 졸-겔 방법에 의하여 제조하였다. 합성된 광촉매는 UV조사하에서 MB용액의 광분해에 사용되었다. BET 데이터는 Fe와 Ti의 여러 가지 농도를 가지고 처리된 ACF의 표면에서 흡착 특성을 보여준다. SEM 사진에서 보여지는 것처럼, 철 혼합물과 TiO2는 ACF 표면에 활착되어 있음을 나타내었다. X선 분말 회절법으로부터 얻어진 결과는 복합체로부터 FeO+TiO2, Anatase 및 Rutile 구조의 결정상을 나타내었다. 원소분석을 위한 EDX spectra는 Fe와 함께 C, O, Ti의 peak들이 존재함을 나타내었다. MB분해에 대한 활성은 TiO2의 광분해와 Fe의 photo-Fenton 효과로 인해 전자/hole쌍 반응으로부터 파생된 ·OH 라디칼들에 의한 것으로 여겨진다. In this paper, the Fe-activated carbon fiber (ACF)/TiO2 composite catalysts were prepared by a sol-gel method. The synthesized photocatalysts were used for the photo degradation of Methylene blue solution under UV light. From Brunauer-Emmett-Teller measurements (BET) data, it was shown the blocking of the micropores on the surface of ACF by treatment of Fe and Ti compound. As shown in SEM images, the ferric compounds and titanium dioxides were fixed onto the ACF surfaces. The result of X-ray powder diffraction showed that the crystal phase contained a mixing anatase and rutile structure and the `FeO+TiO2` from the composites. The EDX spectra for the elemental analysis showed the presence of C, O, and Ti with Fe peaks. Degradation activity of MB could be attributed to ·OH radicals derived from electron/hole pair`s reactions due to photolysis of TiO2 and photo-Fenton effect of Fe.

Fabrication of Fe-ACF/TiO₂ composites and their photonic activity for organic dye

장간,맹칙달,고원배,오원춘,Zhang, Kan,Meng, Ze-Da,Ko, Weon-Bae,Oh, Won-Chun The Korean Society of Analytical Sciences 2009 분석과학 Vol.22 No.3

Activated carbon fiber treated with iron compound (Fe-ACF) was employed for preparation of Feactivated carbon fiber/$TiO_2$ (Fe-ACF/$TiO_2$) composite catalysts. Then, the prepared Fe-ACF/$TiO_2$ composite catalysts were characterized by employing BET, SEM, XRD and EDX instruments. It showed that BET surface area was related to adsorption capacity for each composite. The SEM results showed that ferric compound and titanium dioxide were distributed on the surfaces of ACF. The XRD results showed that Fe-ACF/$TiO_2$ composite mostly contained an anatase structure with a Fe mediated compound. EDX results showed the presence of C, O, and Ti with Fe peaks in Fe-ACF/$TiO_2$ composites. From photocataytic degradation effect, it was observed in the organic dye (Methylene blue, MB) degradation by these composites. Different degradation effect can be attributed to the synergetic effects of photo-Fenton reaction of Fe. It was considered that the combined reactions of Fe-ACF/$TiO_2$ produce powerful photo-Fenton process in the MB degradation.

Characterization of Fe-ACF/TiO₂ composite and photocatalytic activity for MB Solution under visible light

장간,맹칙달,오원춘,Zhang, Kan,Meng, Ze-Da,Oh, Won-Chun The Korean Society of Analytical Science 2010 분석과학 Vol.23 No.3

본 연구에서 종래의 졸-겔법을 사용하여 Fe-ACF/$TiO_2$ 광촉매 복합체를 제조하였고, 이들 광촉매의 분해능은 메틸렌블루 (MB) 용액의 분해에 의하여 나타내었다. 제조된 이들 복합체에 대한 입자크기, 표면구조, 결정상 및 원소분석을 BET, SEM, XRD 및 EDX에 의하여 각각 특성화 하였다. 가시광선 조건에서 분해된 MB 농도에 대한 스펙트라는 UV/Vis 분광기에 의하여 얻어 졌다. 이와 같이 얻어진 스펙트라는 MB의 제거된 농도로부터 광촉매 활성을 입증하였다. 이들 광촉매 활성은 가시광선 조건에서 복합체 광촉매 내에 존재하는 ACF, $TiO_2$ 및 Fe 사이에 강력한 시너지 반응에 의해 유도된 것으로 여겨진다. In present study, a conventional sol-gel method was used to prepare Fe-ACF/$TiO_2$ composites, a kind of composite photocatalysts, whose capability was evaluated by degrading methylene blue (MB) solution. The particle size, surface structure, crystal phase and elemental identification of the composites prepared were characterized by BET, SEM, XRD and EDX, respectively. The spectra of MB concentration degraded under visible light were obtained by UV/Vis spectrophotometer. These obtained spectra demonstrated the photocaltalytic activity from removal concentrations of MB. It was considered that these photonic activities are induced by a strong synergetic reaction among ACF, $TiO_2$ and Fe in the composite photocatalysts under visible light.

Photocatalytic activity of Fe treated AC/TiO₂ composites between visible light and UV light irradiation

맹칙달(Meng, Ze-Da),장간(Zhang, Kan),오원춘(Oh, Won-Chun) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.5

FAT복합체는 TOS (TiOSO4·xH2O)를 사용하여 솔-겔 방법으로 제조한다. 시료들은 SEM, 비표면적, XRD 및 EDX를 사용하여 분석하였다. SEM결과로서 Fe 와 TiO₂ 입자가 AC 표면에 분포하고 있다. XRD 결과에서 Fe‐ AC/TiO2 복합체는 다 anatase결정상을 하고 있다. 그리고 EDX 결과에서 C, O, Ti 및 Fe 원소가 Fe‐AC/TiO2 복합체 에 다 존재하고 있다. 복합체의 광촉매 활성은 가시광선과 UV광선을 사용하고 메틸렌불루(MB)의 분해 효과에 의해 측정한다. Fe-AC/TiO2 복합체는 강한 가시광선 조사에서 우수한 광촉매 효과가 나타난다. AC/TiO2 복합체에 있는 소 량 존재하는 Fe 원소가 그들의 광촉매 활성을 강화할 수 있다. FAT compounds photocatalysts were prepared with TiOSO4·xH2O (TOS) by a sol‐gel method. The samples were characterized by scanning electron microscopy (SEM), BET specific surface area, X‐ray diffraction analysis (XRD) and energy dispersive X‐ray spectroscopy (EDX). The SEM results showed that ferric compounds and titanium dioxide were fixed onto the AC surfaces. The XRD results showed that Fe‐AC/TiO2 composites mostly contained anatase phase. EDX showed the presence of C, O, and Ti with Fe peaks in all samples. The photocatalytic activities were evaluated by the photocatalytic oxidation of methylene blue (MB) solution, via compare photodegradation of MB solution under visible light and UV light separately. Fe‐AC/TiO2 composites had an excellent photocatalytic under strong visible light irradiation. A small amount of Fe ions in AC/TiO2 particles could obviously enhance their photocatalytic activity.

여러 가지 탄소 전구체와 TNB를 이용하여 탄소-TiO2 복합체를 제조 및 그들의 광촉매 특성

진명량 ( Ming Liang Chen ),장봉군 ( Feng Jun Zhang ),장간 ( Kan Zhang ),맹칙달 ( Ze Da Meng ),오원춘 ( Won Chun Oh ) 한국고무학회 2010 엘라스토머 및 콤포지트 Vol.45 No.1

우리는 탄소 전구체로 활성탄 (AC), 활성탄 섬유 (ACF)와 탄소나노튜브 (MWCNT)와 티타늄 전구체로써 TNB를 사용하여 탄소-TiO2 복합체를 제조하였으며, 이들의 특성을SEM, TEM, BET, XRD와 EDX를 이용하여 분석하였다. 그리고 이들의 광촉매 활성은 UV 램프 조사에서 일정한 농도의 MB 용액을 이용하여 측정하였다. UV조사한 후에 MB의 농도는 UV-vis 분광광도기를 이용하여 측정하였다. We used activated carbon (AC), activated carbon fiber (ACF) and multi-walled carbon nanotube (MWCNT)as carbon sources and titanium n-butoxide as titanium source to prepare carbon-TiO2 composites. For characterization their properties, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, X-ray diffraction(XRD) and energy dispersive X-ray analysis (EDX) were used. And the photoactivity of the carbon-TiO2 composites, underUV irradiation, was tested using the fixed concentration of methylene blue (MB, C16H18N3S·Cl·3H2O) in aqueous solution. After UV irradiation for a certain time, the concentration of MB solution was determined by UV-vis absorption spectroscopy.