Effective catalytic reduction of Cr(VI) over TiO2 nanotube supported Pd catalysts
Effective catalytic reduction of Cr(VI) over TiO2 nanotube supported Pd catalysts
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TiO2 纳米管负载 Pd 催化剂有效催化还原 Cr(VI)
DOI：
10.1016/j.apcatb.2011.04.004
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发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
Zhaoyi Xu
中科院分区：
文献类型：
--
作者：
Shourong Zheng;Huan Chen;Dongqiang Zhu;Yun Shao;Haiqin Wan;Yuqiu Wan;Zhaoyi Xu
Cr（VI）是水环境中常见的重金属污染物。采用光沉积法制备了TiO 2纳米管（TNT）负载Pd（Pd/TNT）和商品TiO 2（P25）负载Pd（Pd/TiO 2）催化剂，并考察了催化剂上Cr（VI）的催化加氢还原性能。与P25相比，TNT具有更高的比表面积和表面酸性，从而导致更高的Pd在催化剂载体上的分散。假定Pd负载量为约2.0重量%，Pd/TNT和Pd/TiO 2催化加氢分别在30 min和50 min内完全去除初始浓度为1.92 mM的Cr（VI）。Pd/TNT的高催化活性是由于Pd的高分散度和TNT的高表面酸性共同作用的结果。增加初始浓度的Cr（VI）或pH值抑制的加氢还原由于降低了可用性的载体酸位点的Cr（VI）吸附或去质子化。研究结果表明，Pd/TNT催化加氢还原水溶液中的Cr（VI）是一种很有前途的技术。
Cr(VI) is a commonly identified heavy metal pollutant in the aquatic environment. In the present study, TiO2nanotube (TNT) supported Pd (Pd/TNT) and commercial TiO2(P25) supported Pd (Pd/TiO2) catalysts were prepared using the photo-deposition method and Cr(VI) reduction by catalytic hydrogenation over the catalysts were investigated. Compared with P25, TNT had much higher specific surface area and surface acidity, resulting in higher Pd dispersion on the catalyst support. Given a Pd loading amount of approximately 2.0 wt.%, complete removal of Cr(VI) at an initial concentration of 1.92 mM by catalytic hydrogenation over Pd/TNT and Pd/TiO2was achieved in 30 min and 50 min, respectively. The higher catalytic activity of Pd/TNT was attributed to the combined effect of higher Pd dispersion and higher surface acidity on TNT. Increasing the initial concentration of Cr(VI) or pH suppressed the hydrogenation reduction due to the lowered availability of the support acid sites by Cr(VI) adsorption or deprotonation. The findings indicate that catalytic hydrogenation over Pd/TNT is a promising technique to reduce Cr(VI) in aqueous solutions.
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影响因子：
22.1
作者：
Guang Yuan;M. Keane
通讯作者：
Guang Yuan;M. Keane
影响因子：
3.4
作者：
M. Keane
通讯作者：
M. Keane
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影响因子：
22.1
作者：
Chen, Huan;Xu, Zhaoyi;Zheng, Shourong
通讯作者：
Zheng, Shourong
影响因子：
3.9
作者：
Kasuga, T;Hiramatsu, M;Niihara, K
通讯作者：
Niihara, K
影响因子：
3.7
作者：
Aarthi, T.;Madras, Giridhar
通讯作者：
Madras, Giridhar