[학위논문]Cl, Br and I) and TiO2/BiOX hybrid microflowers for photocatalytic water treatments = CoFe2O4/BiOX (X=Cl, Br, I) 와 TiO2/BiOX 하이브리드 물질의 광촉매적 수처리 연구 CoFe2O4/BiOX (X원문보기
첫 번째 연구에서는 나노크기의 CoFe2O4를 BiOX (X=Cl, Br, I) 와 함께 합성하여 재활용에 편리한 자성체광촉매로 합성하였으며, 주사전자현미경, X선 회절 분석기, UV-vis 흡수 스펙트럼, 퓨리에 변환 적외선 분광기, 광발광 분광기 등을 사용하여 분석하였다. CoFe2O4/BiOX 의 흡착과 광촉매 효율 측정은 ...
첫 번째 연구에서는 나노크기의 CoFe2O4를 BiOX (X=Cl, Br, I) 와 함께 합성하여 재활용에 편리한 자성체광촉매로 합성하였으며, 주사전자현미경, X선 회절 분석기, UV-vis 흡수 스펙트럼, 퓨리에 변환 적외선 분광기, 광발광 분광기 등을 사용하여 분석하였다. CoFe2O4/BiOX 의 흡착과 광촉매 효율 측정은 methyl orange(MO), rhodamine B(Rh B), methylene blue(MB), 그리고 mixed dye(MO+Rh B+MB)에서 가시광선과 자외선을 조사하면서 이루어 졌다. 흡착률은 CoFe2O4/BiOI가 CoFe2O4/BiOCl, CoFe2O4/BiOBr보다 더 좋았고 광반응 효율은 Rhodamine B에서 CoFe2O4/BiOBr < CoFe2O4/BiOCl < CoFe2O4/BiOI 순으로 나타났다. 시료의 광촉매적 효율은 순수한 MO, MB 그리고 mixed dye에서도 조사하였다. Mixed dye에서 MO는 순수한 MO보다 분해가 잘 되었다. 스케빈저 테스트 결과 h+와 •O2 가 염료분해에 영향을 미치는 주요 화학종으로 나타났다. •OH 라디칼이 CoFe2O4/BiOCl 과 CoFe2O4/BiOBr에 영향을 미쳤지만 다른 화학종에 비하여 매우 작은 영향이었다. 두 번째 연구에서는 TiO2와 BiOX의 하이브리드 광촉매를 합성하여 주사전자현미경, 투과 전자 현미경, X선 회절 분석기, UV-vis 흡수 스펙트럼, 퓨리에 변환 적외선 분광기, 광발광 분광기 등을 사용하여 분석하였다. 합성된 광촉매는 orange G, tartrazine, mixed dye(MO + Rh B + MB) 그리고 real sample test를 위한 포도즙, 양배추즙을 사용하여 광촉매 효율을 측정하였다. 또한 H2O2가 있을 때와 없을 때의 조건으로 실험을 하였다. Mixed dye에서, TiO2/BiOI가 가장 큰 흡착정도와 광촉매적 효율을 나타내었고, mixed dye에서 MO가 모든 시료에서 가장 분해가 빨리 되었다. TiO2/BiOI 는 orange G와 tartrazine에서도 가장 좋은 효율을 나타내었다. 세 가지 광촉매는 포도즙과 양배추즙 분해에서 비슷한 효율을 나타내었다. 염료분해는 H2O2가 첨가되었을 때 더 좋은 효율을 보였다
첫 번째 연구에서는 나노크기의 CoFe2O4를 BiOX (X=Cl, Br, I) 와 함께 합성하여 재활용에 편리한 자성체 광촉매로 합성하였으며, 주사전자현미경, X선 회절 분석기, UV-vis 흡수 스펙트럼, 퓨리에 변환 적외선 분광기, 광발광 분광기 등을 사용하여 분석하였다. CoFe2O4/BiOX 의 흡착과 광촉매 효율 측정은 methyl orange(MO), rhodamine B(Rh B), methylene blue(MB), 그리고 mixed dye(MO+Rh B+MB)에서 가시광선과 자외선을 조사하면서 이루어 졌다. 흡착률은 CoFe2O4/BiOI가 CoFe2O4/BiOCl, CoFe2O4/BiOBr보다 더 좋았고 광반응 효율은 Rhodamine B에서 CoFe2O4/BiOBr < CoFe2O4/BiOCl < CoFe2O4/BiOI 순으로 나타났다. 시료의 광촉매적 효율은 순수한 MO, MB 그리고 mixed dye에서도 조사하였다. Mixed dye에서 MO는 순수한 MO보다 분해가 잘 되었다. 스케빈저 테스트 결과 h+와 •O2 가 염료분해에 영향을 미치는 주요 화학종으로 나타났다. •OH 라디칼이 CoFe2O4/BiOCl 과 CoFe2O4/BiOBr에 영향을 미쳤지만 다른 화학종에 비하여 매우 작은 영향이었다. 두 번째 연구에서는 TiO2와 BiOX의 하이브리드 광촉매를 합성하여 주사전자현미경, 투과 전자 현미경, X선 회절 분석기, UV-vis 흡수 스펙트럼, 퓨리에 변환 적외선 분광기, 광발광 분광기 등을 사용하여 분석하였다. 합성된 광촉매는 orange G, tartrazine, mixed dye(MO + Rh B + MB) 그리고 real sample test를 위한 포도즙, 양배추즙을 사용하여 광촉매 효율을 측정하였다. 또한 H2O2가 있을 때와 없을 때의 조건으로 실험을 하였다. Mixed dye에서, TiO2/BiOI가 가장 큰 흡착정도와 광촉매적 효율을 나타내었고, mixed dye에서 MO가 모든 시료에서 가장 분해가 빨리 되었다. TiO2/BiOI 는 orange G와 tartrazine에서도 가장 좋은 효율을 나타내었다. 세 가지 광촉매는 포도즙과 양배추즙 분해에서 비슷한 효율을 나타내었다. 염료분해는 H2O2가 첨가되었을 때 더 좋은 효율을 보였다
PART Ⅰ Recycling of photocatalysts is very important as well as improving their activities by hybridizing two materials. Herein, we embedded nanosize magnetic CoFe2O4 nanoparticles (NPs) into nanosize-assembled BiOX (X=Cl, Br and I) microflowers in ethylene glycol solvent by a solvothermal method. T...
PART Ⅰ Recycling of photocatalysts is very important as well as improving their activities by hybridizing two materials. Herein, we embedded nanosize magnetic CoFe2O4 nanoparticles (NPs) into nanosize-assembled BiOX (X=Cl, Br and I) microflowers in ethylene glycol solvent by a solvothermal method. Their natures were examined by scanning electron microscopy (SEM), electron transmission microscopy (TEM), X-ray diffraction (XRD), UV-visible absorption, Fourier-transform infrared (FT-IR), and photoluminescence spectroscopy. We first demonstrated the adsorption and photocatalytic performances of CoFe2O4/BiOX for rhodamine B (RhB) and a mixed dye (methyl orange + RhB + methylene blue) under UV and visible light irradiation. The adsorption capacity of CoFe2O4/BiOI for RhB was found to be 160 mg/gcat, significantly larger than <5mg/gcat for CoFe2O4/BiOCl and CoFe2O4/BiOBr. The photocatalytic activity showed an order of CoFe2O4/BiOBr < CoFe2O4/BiOCl < CoFe2O4/BiOI. MO in the mixed dye was the most easily removed by the catalysts under light exposure. On the basis of the scavenger tests, h+ and •O2 play major and minor roles in photodegradation of the dyes, respectively. Although •OH radical was formed for CoFe2O4/BiOBr and CoFe2O4/BiOCl, the role was found to be extremely lower than other active species. PART Ⅱ Hybridization of two different materials is important to achieve improved photocatalytic degradation properties. Generally, photocatalysts does not show good linear catalytic performance towards all the dyes. In this article, we report synthesis of nano-assembled TiO2/BiOX (X = Cl, Br or I) hybrid microspheres which were confirmed by powder X-ray diffraction crystallography, field emission scanning electron microscopy, electron transmission microscopy, UV-visible, Fourier-transform infrared, and photoluminescence spectroscopy. The synthesized photocatalysts were extensively examined for photocatalytic activities with simple and pure (orange G and tartrazine), mixed (methyl orange + rhodamine B + methylene blue) and natural dyes extracted from grapes and cabbages (real sample analysis) with and without H2O2 addition under visible light irradiation. For the mixed dyes, TiO2/BiOI showed the highest adsorption capacity and TiO2/BiOCl showed the highest photocatalytic activity. Methyl orange in the mixed dyes was the most rapidly photodegraded for all the photocatalysts. TiO2/BiOI showed the highest photocatalytic activity for orange G and tartrazine. The three different photocatalysts showed no difference in dye degradation activity to the natural dyes (real sample analysis). The photocatalytic activity was greatly enhanced by H2O2 addition, indicating an important role of •OH species.
PART Ⅰ Recycling of photocatalysts is very important as well as improving their activities by hybridizing two materials. Herein, we embedded nanosize magnetic CoFe2O4 nanoparticles (NPs) into nanosize-assembled BiOX (X=Cl, Br and I) microflowers in ethylene glycol solvent by a solvothermal method. Their natures were examined by scanning electron microscopy (SEM), electron transmission microscopy (TEM), X-ray diffraction (XRD), UV-visible absorption, Fourier-transform infrared (FT-IR), and photoluminescence spectroscopy. We first demonstrated the adsorption and photocatalytic performances of CoFe2O4/BiOX for rhodamine B (RhB) and a mixed dye (methyl orange + RhB + methylene blue) under UV and visible light irradiation. The adsorption capacity of CoFe2O4/BiOI for RhB was found to be 160 mg/gcat, significantly larger than <5mg/gcat for CoFe2O4/BiOCl and CoFe2O4/BiOBr. The photocatalytic activity showed an order of CoFe2O4/BiOBr < CoFe2O4/BiOCl < CoFe2O4/BiOI. MO in the mixed dye was the most easily removed by the catalysts under light exposure. On the basis of the scavenger tests, h+ and •O2 play major and minor roles in photodegradation of the dyes, respectively. Although •OH radical was formed for CoFe2O4/BiOBr and CoFe2O4/BiOCl, the role was found to be extremely lower than other active species. PART Ⅱ Hybridization of two different materials is important to achieve improved photocatalytic degradation properties. Generally, photocatalysts does not show good linear catalytic performance towards all the dyes. In this article, we report synthesis of nano-assembled TiO2/BiOX (X = Cl, Br or I) hybrid microspheres which were confirmed by powder X-ray diffraction crystallography, field emission scanning electron microscopy, electron transmission microscopy, UV-visible, Fourier-transform infrared, and photoluminescence spectroscopy. The synthesized photocatalysts were extensively examined for photocatalytic activities with simple and pure (orange G and tartrazine), mixed (methyl orange + rhodamine B + methylene blue) and natural dyes extracted from grapes and cabbages (real sample analysis) with and without H2O2 addition under visible light irradiation. For the mixed dyes, TiO2/BiOI showed the highest adsorption capacity and TiO2/BiOCl showed the highest photocatalytic activity. Methyl orange in the mixed dyes was the most rapidly photodegraded for all the photocatalysts. TiO2/BiOI showed the highest photocatalytic activity for orange G and tartrazine. The three different photocatalysts showed no difference in dye degradation activity to the natural dyes (real sample analysis). The photocatalytic activity was greatly enhanced by H2O2 addition, indicating an important role of •OH species.
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