전이금속도핑에 의한 광촉매의 특성분석 및 가시광광분해 효과를 알아보았다. Co, Cu, Ni, Fe, Co-Cu, Co-Ni이 도핑된 ...
전이금속도핑에 의한 광촉매의 특성분석 및 가시광광분해 효과를 알아보았다. Co, Cu, Ni, Fe, Co-Cu, Co-Ni이 도핑된 TiO2 광촉매를 이용하여 Rhodamine B (RhB) 염료분해 실험을 수행하였다. 촉매제조는 함침법(Impregnation)중 하나인 Solid state reaction 방법에 의해 이루어 졌다. 제조된 광촉매 0.1 을 첨가한 RhB 10 ppm (200 ml) 농도의 solution을 visible light source하에서 photocatalytic dye splitting reaction을 통해 20분마다 sample을 취하고 4시간 동안 염료분해실험을 진행하였다. 제조된 촉매의 물성 및 특성분석은 XRD, XPS, FT-IR, SEM, Raman, UV/Vis-DRS를 통해 이루어졌다. XRD를 통해 금속도핑에 따라 TiO2 결합패턴구조가 깨지지 않고 (101) face인 anatase구조가 약간씩 shift 변화를 확인하였다. FT-IR 분석을 통해 bonding 구조의 투과율이 증가함을 알았고, XPS를 통해 도핑한 금속의 peak를 확인할 수 있었다. UV/Vis-DRS를 통해 band gap을 계산하였으며, Raman 분석을 통해 함유량 증가에 따라 intensity가 증가하고 Raman shift가 증가함을 알 수 있었다. SEM 이미지를 통해 금속 도핑된 광촉매의 aggregation(응집력)이 일어났음을 확인하였다. UV/Vis Spectroscopy를 통해 Co-TiO2(3wt%) 광촉매의 염료분해효율이 90%로 가장 효율이 높게 측정된 것을 얻었고 금속을 혼합한 광촉매의 효율은 Cu-TiO2(3wt%)의 광촉매를 포함해 30%의 효율을 넘지 못한 것을 알 수 있었다.
전이금속 도핑에 의한 광촉매의 특성분석 및 가시광 광분해 효과를 알아보았다. Co, Cu, Ni, Fe, Co-Cu, Co-Ni이 도핑된 TiO2 광촉매를 이용하여 Rhodamine B (RhB) 염료분해 실험을 수행하였다. 촉매제조는 함침법(Impregnation)중 하나인 Solid state reaction 방법에 의해 이루어 졌다. 제조된 광촉매 0.1 을 첨가한 RhB 10 ppm (200 ml) 농도의 solution을 visible light source하에서 photocatalytic dye splitting reaction을 통해 20분마다 sample을 취하고 4시간 동안 염료분해실험을 진행하였다. 제조된 촉매의 물성 및 특성분석은 XRD, XPS, FT-IR, SEM, Raman, UV/Vis-DRS를 통해 이루어졌다. XRD를 통해 금속도핑에 따라 TiO2 결합패턴구조가 깨지지 않고 (101) face인 anatase구조가 약간씩 shift 변화를 확인하였다. FT-IR 분석을 통해 bonding 구조의 투과율이 증가함을 알았고, XPS를 통해 도핑한 금속의 peak를 확인할 수 있었다. UV/Vis-DRS를 통해 band gap을 계산하였으며, Raman 분석을 통해 함유량 증가에 따라 intensity가 증가하고 Raman shift가 증가함을 알 수 있었다. SEM 이미지를 통해 금속 도핑된 광촉매의 aggregation(응집력)이 일어났음을 확인하였다. UV/Vis Spectroscopy를 통해 Co-TiO2(3wt%) 광촉매의 염료분해효율이 90%로 가장 효율이 높게 측정된 것을 얻었고 금속을 혼합한 광촉매의 효율은 Cu-TiO2(3wt%)의 광촉매를 포함해 30%의 효율을 넘지 못한 것을 알 수 있었다.
Effective visible-light driven TiO2 based photocatalysts for photodegradation of harmful Rhodamine B (RhB) dye were synthesized and characterized. A series of doped TiO2 catalysts were prepared by transition metal doping such as Co, Cu, Ni, Fe, Co-Cu, Co-Ni via impregnation method and their photocat...
Effective visible-light driven TiO2 based photocatalysts for photodegradation of harmful Rhodamine B (RhB) dye were synthesized and characterized. A series of doped TiO2 catalysts were prepared by transition metal doping such as Co, Cu, Ni, Fe, Co-Cu, Co-Ni via impregnation method and their photocatalytic activities for the degradation of RhB dye under visible light were examined. All doped TiO2 catalysts were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM), Raman spectroscopy and Ultraviolet/visible diffuse reflectance spectroscopy (UV/Vis-DRS) analysis. XRD pattern and Raman spectra of metals-doped TiO2 showed slight shifting to high angle side as compared to bare TiO2. FT-IR spectra of metal-doped TiO2 presented a significant shift of Ti-O peak in comparison with bare TiO2, confirming the bond formation between matal and TiO2 framework. The band gap of photocatalysts decreased after doping the metal in TiO2 (3.19 eV) from UV/Vis-DRS analysis results. Co-TiO2 photocatalysts exhibited the highest shifting in Ti-O peak with highest peak intensity, which might be due to the formation of strong bond between Ti-O unit and Co ions. From XPS results, Co-TiO2 catalysts exhibited the Ti-O bonding along with stable Co+2 ions, while the other metals such as Cu, Ni, existed in the mixture of two oxidation states of M+2 and M+3, resulting in the most stable and highly active Co-TiO2 catalysts for the degradation of RhB dye under visible light. The photocatalytic reaction was performed in three necked reactor and a xenon lamp with 400 nm cut filter for visible radiation. For photocatalytic degradation, 0.1 g of catalysts was added into the freshly prepared 10 ppm aqueous RhB dye solution and was carried out under visible light irradiation. From photocatalytic results, Co(3wt%)-TiO2 catalysts showed the highest degradation rate of ∼90% in 4 h, whereas binary metal doped such as Co/Cu-TiO2 and Co/Ni-TiO2 catalysts achieved very low degradation rates of 20∼30% in 4 h. The enhanced phtocatalytic reaction performance of Co-TiO2 could be explained by the formation of stable and strong bonding between Co and TiO2, resulting in the decreased band gap, which may produce large number of charge carriers upon light illumination significantly elevating the production of oxyradicals.
Effective visible-light driven TiO2 based photocatalysts for photodegradation of harmful Rhodamine B (RhB) dye were synthesized and characterized. A series of doped TiO2 catalysts were prepared by transition metal doping such as Co, Cu, Ni, Fe, Co-Cu, Co-Ni via impregnation method and their photocatalytic activities for the degradation of RhB dye under visible light were examined. All doped TiO2 catalysts were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM), Raman spectroscopy and Ultraviolet/visible diffuse reflectance spectroscopy (UV/Vis-DRS) analysis. XRD pattern and Raman spectra of metals-doped TiO2 showed slight shifting to high angle side as compared to bare TiO2. FT-IR spectra of metal-doped TiO2 presented a significant shift of Ti-O peak in comparison with bare TiO2, confirming the bond formation between matal and TiO2 framework. The band gap of photocatalysts decreased after doping the metal in TiO2 (3.19 eV) from UV/Vis-DRS analysis results. Co-TiO2 photocatalysts exhibited the highest shifting in Ti-O peak with highest peak intensity, which might be due to the formation of strong bond between Ti-O unit and Co ions. From XPS results, Co-TiO2 catalysts exhibited the Ti-O bonding along with stable Co+2 ions, while the other metals such as Cu, Ni, existed in the mixture of two oxidation states of M+2 and M+3, resulting in the most stable and highly active Co-TiO2 catalysts for the degradation of RhB dye under visible light. The photocatalytic reaction was performed in three necked reactor and a xenon lamp with 400 nm cut filter for visible radiation. For photocatalytic degradation, 0.1 g of catalysts was added into the freshly prepared 10 ppm aqueous RhB dye solution and was carried out under visible light irradiation. From photocatalytic results, Co(3wt%)-TiO2 catalysts showed the highest degradation rate of ∼90% in 4 h, whereas binary metal doped such as Co/Cu-TiO2 and Co/Ni-TiO2 catalysts achieved very low degradation rates of 20∼30% in 4 h. The enhanced phtocatalytic reaction performance of Co-TiO2 could be explained by the formation of stable and strong bonding between Co and TiO2, resulting in the decreased band gap, which may produce large number of charge carriers upon light illumination significantly elevating the production of oxyradicals.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.