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以共沉淀法制备的铁酸铝和溶胶-凝胶法制备的二氧化钛粉体作为前驱体, 合成了铁酸铝-二氧化钛纳米复合材料, 通过曙红染料和甲基橙的光催化降解来评价该纳米复合材料的光催化活性, 并与单一二氧化钛的光催化性能进行了比较. 实验结果表明: 无论是紫外光还是太阳光的激发下, 铁酸铝-二氧化钛纳米复合材料的光催化活性均优于同样条件下所制备的单一二氧化钛纳米材料, 理想的铁酸铝掺杂浓度分别是1.0%(紫外光)和9.0%(太阳光). 由于在二氧化钛基体中掺入铁酸铝纳米粒子, 既可以促进光生载流子的电荷分离, 又可以使二氧化钛的光响应波长向可见光区域拓展, 提高了太阳能利用率, 从而使其在太阳光下具有更优越的光催化活性. 相似文献
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氧化锌纳米点阵列体系的制备及发光性能 总被引:8,自引:0,他引:8
A novel nano-masking technique based on porous alumina membrane as mask was developed for preparing ZnO nanodots on Si substrate. The as-deposited nanodots with uniform size were in two-dimensional, regular array, whose regular structure and diameter were closely related to the mask used. Photoluminescence results show that the ZnO nanodot array have a strong UV light emission peak around 380 nm and a wide blue-green light emission peak at 460~610 nm at room temperature. The former corresponds to the near band edge emission of the wide band-gap ZnO and the latter could be attributed to the recombination of a photogenerated hole with singly ionized oxygen vacancy. 相似文献
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铁酸锌掺杂对二氧化钛结构相变及光催化性能的影响 总被引:15,自引:0,他引:15
分别采用共沉淀法和溶胶-凝胶法制备铁酸锌和二氧化钛纳米粉体,较系统地研究了铁酸锌纳米掺杂对二氧化钛“锐钛矿→金红石”的结构相变及光催化性能的影响.结果表明,适量铁酸锌的掺杂可促进二氧化钛的结构相变,显著提高其光催化活性,在最佳掺杂浓度时,其光催化降解苯酚的效率可以提高2~3倍. 相似文献
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