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RISS 인기검색어
- 검색키워드
- 저자 : Rigoberto López-Juárez (검색결과 2 건)
- 무료
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Simón Yobanny Reyes López,Rosa Saucedo Acuña,Rigoberto López-Juárez,Juan Serrato Rodríguez 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.5
A new simplified route to prepare crystalline α-alumina powders is proposed from the decomposition of aluminum formate Al(O2CH)3 precursor following a process of gelation of Al(O2CH)3 in an aqueous medium. Heat treated powders were characterized by XRD, Raman and infrared spectroscopy showing the presence of η-Al2O3 at 1000 o C and the transformation to α-Al2O3 at 1100 o C, where SEM images of α-Al2O3 reveled an size of 1-2 μm by the aggregated particles, and TEM images confirm a particles size of 200-300 nm. By other hand BET study showed that the specific surface area of η-Al2O3 and the α- Al2O3 obtained is higher than the specific surface area reported for these materials (until 118 m2 /g), ratify that this new route process at low temperature promote to obtain the powers with an excellent superficial area.
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Cr-doped BiYO3 photocatalyst for degradation of oxytetracycline under visible light irradiation
Hernández-Arellano Diana L.,Durán-Álvarez Juan C.,Cortés-Lagunes Silvana,Zanella Rodolfo,Soto Tania E.,López-Juárez Rigoberto 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
Chromium-doped BiYO3 powders were synthesized by the Pechini method at low temperature between 400 and 800 °C for 1 h. From the XRD results it was observed the coexistence between tetragonal and cubic phases for samples calcined at 400 °C for 1 h. Meanwhile, for samples calcined at 600 and 800 °C, a single cubic phase was observed. The powders consisted of agglomerates of nanocrystals as shown in the SEM and TEM images. The specific surface area was in the order of 3.01–7.74 m2 g−1, obtained from BET analysis. The band gap of BiYO3 and Cr-doped BiYO3 was < 2.21 eV which corroborates that these materials absorb light in the visible region of the electromagnetic spectrum. The photocatalytic decomposition of oxytetracycline was successfully achieved using Cr-doped BiYO3, where the best performance was obtained with BiY0.98Cr0.02O3 ceramic powders calcined at 800 °C for 1 h. For this composition the removal of oxytetracycline after 240 min of visible light irradiation was 100% of degradation and 75% of mineralization. The photocatalytic process was driven by the photo-holes, as a negligible production of ·OH radicals was observed in tests using scavengers. The photocatalytic activity of the BiY0.995Cr0.005O3 and BiY0.98Cr0.02O3 materials was corroborated under more realistic conditions, using tap water and trace concentration of the antibiotic. The high stability of the photocatalyst was observed through four consecutive reaction cycles. The results demonstrate that the Cr-doping has clearly improved the catalytic performance of BiYO3 for degradation of oxytetracycline under visible light irradiation.
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