CdS超薄片层包覆TiO2中空结构复合材料的形成和应用

doi:10.7517/j.issn.1674-0475.2015.05.374

影像科学与光化学 ›› 2015, Vol. 33 ›› Issue (5): 374-382.DOI: 10.7517/j.issn.1674-0475.2015.05.374

CdS超薄片层包覆TiO₂中空结构复合材料的形成和应用

张国强^1,2, 曲丹^1,2, 苗湘^1,2, 张晓燕^1,2, 孙再成¹

1. 中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室, 吉林长春 130033;
2. 中国科学院大学, 北京 100049

收稿日期:2015-04-27 修回日期:2015-06-05 出版日期:2015-09-16 发布日期:2015-09-16
通讯作者: 孙再成
基金资助:
国家自然科学基金项目(21301166, 21201159, 61361166004)和吉林省科技厅基金项目(20130522127JH, 20121801)资助

Formation Process of TiO₂ Hollow Nanofibers Covered with CdS Ultrathin Nanosheets

ZHANG Guoqiang^1,2, QU Dan^1,2, MIAO Xiang^1,2, ZHANG Xiaoyan^1,2, SUN Zaicheng¹

1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Changchun 130033, Jilin, P. R. China;
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received:2015-04-27 Revised:2015-06-05 Online:2015-09-16 Published:2015-09-16

摘要/Abstract

摘要：

本实验以钛酸四丁酯为钛源,醋酸镉为镉源,利用静电纺丝的方法制备了直径~250 nm的电纺丝纳米纤维。通过高温煅烧和硫化钠溶液进行水热处理,得到CdS超薄片层包覆TiO₂中空结构的纳米纤维。推测该复合结构形貌的形成过程为:在Ti/Cd(摩尔比)为1:1和2:1时,由于CdO的含量较高,反应过程中CdO溶解,并与反应溶液中的S^2-形成CdS超薄片层生长在纤维的外表面,剩余的TiO₂纳米粒子聚集形成中空的纳米管状结构;而Ti/Cd(摩尔比)为4:1和8:1时,由于溶解的CdO较少不足以形成TiO₂纳米管,同时,生成的CdS也不足以完全包覆TiO₂纳米纤维形成非管状结构。当Ti/Cd为1:1时,TiO₂@CdS复合材料具有最好的产氢活性。在300 W氙灯光照条件下和加UVCUT-420 nm滤光片下,50 mg催化剂产氢速率分别为19.7 μmol/h和3.4 μmol/h,这主要是由于所得到的复合结构中TiO₂为非晶材料。进一步在惰性气氛下煅烧,也很难将TiO₂晶化。

关键词: 电纺丝纳米纤维, CdS超薄片层, 中空TiO₂, TiO₂@CdS, 复合结构形成过程, 产氢

Abstract:

We synthesize the PVP-TBT-Cd(Ac)₂ nanofibers with about 250 nm in diameter by electrospinning technology. After calcination in air and hydrothermal treatment in Na₂S aqueous solution, TiO₂ hollow nanofibers covered with CdS ultrathin nanosheets are formed. The formation process is as follows: the nanofibers are composed of the CdO and TiO₂ nanoparticles after calcination. When hydrothermal treatment in Na₂S aqueous solution, the CdO nanoparticles are dissolved and formed CdS nanosheets covered TiO₂. Due to the dissolution of CdO nanoparticles, the hollow nanofibers composed of TiO₂ nanoparticles are formed. The TiO₂@CdS nanocomposites have the best H₂ production rate when the molar ratio of Ti/Cd is 1/1. The H₂ production rate of TiO₂@CdS nanocomposites is about 19.7 and 3.4 μmol/h for 50 mg sample under 300 W Xe lamp without and with a UVCUT-420 nm filter, respectively.

Key words: electrospinning, CdS nanosheets, TiO₂ hollow structure, formation process, photocatalytic H₂ production

张国强, 曲丹, 苗湘, 张晓燕, 孙再成. CdS超薄片层包覆TiO₂中空结构复合材料的形成和应用[J]. 影像科学与光化学, 2015, 33(5): 374-382.

ZHANG Guoqiang, QU Dan, MIAO Xiang, ZHANG Xiaoyan, SUN Zaicheng. Formation Process of TiO₂ Hollow Nanofibers Covered with CdS Ultrathin Nanosheets[J]. Imaging Science and Photochemistry, 2015, 33(5): 374-382.

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CdS超薄片层包覆TiO₂中空结构复合材料的形成和应用

Formation Process of TiO₂ Hollow Nanofibers Covered with CdS Ultrathin Nanosheets

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