热褪火温度对ZnO纳米棒阵列/活性炭纤维复合材料催化性能的影响

Effect of Thermal Annealing Temperature on the Catalytic Performance of ZnO Nanorod Array/Activated Carbon Fiber Composites

摘要: 本文采用溶胶–凝胶–水热法在活性炭纤维基底上制备了定向生长的ZnO纳米棒阵列，通过快速热褪火方式对该复合催化剂进行改性处理，利用扫描电子显微镜、X射线衍射、氮气物理吸附等手段分析了改性前后催化剂的形貌及结构特征，同时考察了催化剂对亚甲基蓝的暗吸附和光催化效率。研究结果表明，快速热褪火处理显著提高了ZnO纳米棒阵列/活性炭纤维的暗吸附和光催化性能。当热褪火温度为450℃时，经120 min暗吸附和40 min光催化反应后该催化剂对亚甲基蓝的总去除率高达95.8%。

Abstract: The ZnO nanorod arrays were assembled on the activated carbon fibers by combining sol-gel with a hydrothermal method, and rapid thermal annealing was used to modify the composite catalysts. The structural characteristics of the catalysts were analyzed by scanning electron microscopy, X-ray diffraction and nitrogen physisorption, and meanwhile the dark adsorption and photocatalytic efficiency of the catalysts for methylene blue were investigated. The results showed that the dark adsorption and photocatalytic performance of the ZnO nanorod arrays/activated carbon fibers were significantly improved by rapid thermal annealing. When the thermal annealing temperature was 450℃, the total removal efficiency of methylene blue on the catalyst reached 95.8% after 120 min of dark adsorption and 40 min of photocatalytic reaction.