Khedidja Chehhat, A. Mecif, Abd Elouahab Noua, Dogan Kaya, Lazhar Foughali, Imed Eddine Zerrouk, D. Bouras, A. Ekicibil
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引用次数: 0
摘要
本研究制作了环保、低成本的高多孔陶瓷基底,以提高光催化剂的性能。通过浸涂溶胶-凝胶法在天然提取的高岭土(90%)和玉米淀粉(10%)制成的高多孔陶瓷基底上沉积 ZnO 作为光催化剂模型薄膜,并在不同温度下烧结:1150、1200、1250 和 1300 °C。温度对所制备基底的影响改变了它们的孔隙率,1150 ℃ 时的最佳值为 56%,比表面积为 38.80 m2/g。对 X 射线衍射光谱的结构分析表明,ZnO 为六方闪长岩结构,而衬底为莫来石/闪长岩结构。扫描电子显微镜图像证实了基底上 ZnO 的多孔性和均匀形成。高孔隙率样品的反射率高达 90% 以上,带隙能值约为 3.11 eV,这已通过紫外-可见光谱得到验证。通过测试水介质中橙 II 染料在紫外光照射下的降解情况,研究了陶瓷基底上氧化锌薄膜的光催化特性。在多孔基底上沉积的氧化锌薄膜在 1150 ℃ 处理后,降解率最高,达到 92%。动力学研究表明,橙 II 的光催化降解与伪一阶动力学模型相关。
Effect of Temperature on Porous Ceramic Substrates Supported ZnO Thin Films for Enhanced Photocatalytic Activity
In this study, eco-friendly and low-cost highly porous ceramic substrates were fabricated to enhance the performance of photocatalysts. ZnO as a model photocatalyst deposited as thin films by dip-coating sol-gel method on naturally extracted kaolin clay (90%) and Corn starch (10%)-made highly porous ceramic substrates prepared as pellet form and sintered at different temperatures: 1150, 1200, 1250, and 1300 °C. The effect of temperature on the prepared substrates modified their porosity and the best value obtained was 56% with a specific surface area of 38.80 m2/g for 1150 °C. Structural analysis of the X-ray diffraction spectra revealed a hexagonal wurtzite structure for ZnO and mullite/cristoballite structures for substrates. Scanning electron microscopy images confirmed the porosity and uniform formation of ZnO on the substrates. The high porosity samples resulted in a high reflectance of over 90%, and band gap energies values around 3.11 eV were verified by UV–VIS spectroscopy. The photocatalytic properties of ZnO thin films on ceramic substrates were studied by testing the degradation of Orange II dye in an aqueous medium under UV light irradiation. The highest degradation rate of 92% was obtained for ZnO thin films deposited on porous substrates treated at 1150 °C. The kinetic study indicated that the photocatalytic degradation of Orange II correlated with the pseudo-first-order kinetic model.
期刊介绍:
"Journal of Nano Research" (JNanoR) is a multidisciplinary journal, which publishes high quality scientific and engineering papers on all aspects of research in the area of nanoscience and nanotechnologies and wide practical application of achieved results.
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