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OALib Journal期刊
ISSN: 2333-9721
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n、fe共掺杂纳米tio2的制备和性能
Keywords: 无机非金属材料,纳米tio2,n、fe共掺杂,醇热法,可见光吸收,制氢
Abstract:
？以钛酸丁酯为钛源,用醇热法制备了n、fe单掺杂及共掺杂纳米tio2。对样品的晶型结构、表面形貌、比表面积、紫外可见吸收、光致发光和分解水制氢催化性能分别进行了表征。结果表明,在500℃退火的n、fe共掺杂tio2样品均为锐钛矿相棱形纳米颗粒,分散性较好,平均粒径约20nm;n、fe共掺杂的摩尔分数分别为5.0%和2.0%时,样品具有良好的可见光吸收活性,对光的吸收从387nm(未掺杂锐钛矿相tio2)红移至510nm处。主要原因可能是,n和fe共掺杂在其禁带中产生杂质能级,导致其禁带宽度减小;n、fe单掺杂及共掺杂改性,有效抑制了电子-空穴的复合,提高了光生载流子的分离效率;在可见光下(λ>400nm)n、fe共掺杂tio2具有较高的光催化分解水制氢活性,氢气生成速率为299.2μmol？g-1？h-1。
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