Enhanced photocatalytic reduction of aqueous Pb(II) over Ag loaded TiO2 with formic acid as hole scavenger
Enhanced photocatalytic reduction of aqueous Pb(II) over Ag loaded TiO2 with formic acid as hole scavenger
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以甲酸作为空穴清除剂，增强载银 TiO2 上水性 Pb(II) 的光催化还原
DOI：
10.1080/10934529.2012.645775
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发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
Zheng Shourong
中科院分区：
文献类型：
--
作者：
Jiang Fang;Liu Jingliang;Li Liyuan;Wan Yuqiu;Wan Haiqin;Zheng Shourong
为消除水中铅(II)污染，本研究探索了在甲酸存在下，在二氧化钛和银/二氧化钛催化剂上光催化还原铅(II)。采用光沉积法制备了银/二氧化钛催化剂，并用紫外-可见漫反射光谱、X射线反射衍射仪、透射电子显微镜和X射线光电子能谱对其进行了表征。在TiO2光催化剂上沉积银可以促进光催化还原铅(II)，当银负载量为0.99wt.%时，光催化活性最好。在Ag负载量为0.99wt.%的Ag/TiO2光催化剂上，铅(II)的初始还原速率依赖于甲酸和铅(II)的初始浓度。随着初始铅浓度的增加，初始铅还原速率呈线性增加。在甲酸浓度较低时，铅(II)的初始还原速率随甲酸浓度的增加而增加，但在甲酸浓度较高时基本保持不变。溶液pH对光催化还原铅(II)有影响，光照100min后，在pH值为0.8、2.0和3.5时，铅(II)的脱色率分别为11.8%、91.2%和98.6%，表明在实验的pH范围内，随着pH值的升高，铅(II)的还原能力增强。结果表明，Ag/TiO2光催化剂的催化活性优于TiO2光催化剂，显示了Ag/TiO2光催化还原铅(II)的潜力。
In the present study, photocatalytic Pb(II) reduction over TiO2 and Ag/TiO2 catalysts in the presence of formic acid was explored to eliminate Pb(II) pollution in water. Ag/TiO2 catalysts were prepared by the photo-deposition method and characterized using UV-Vis diffuse reflectance spectra, X-ray reflection diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Ag deposition on TiO2 led to enhanced photocatalytic Pb(II) reduction and the Ag/TiO2 catalyst with a Ag loading amount of 0.99 wt.% exhibited the optimum photocatalytic activity. For Pb(II) reduction over Ag/TiO2 with a Ag loading amount of 0.99 wt.%, initial Pb(II) reduction rate was found to be dependent on the initial concentrations of formic acid and Pb(II). Increasing initial Pb(II) concentration led to linearly increased initial Pb(II) reduction rate. At low formic acid concentration, in parallel, initial Pb(II) reduction rates increased with formic concentration, but remained nearly identical at high formic acid concentration. Solution pH impacted the photocatalytic Pb(II) reduction and after irradiation for 100 min Pb(II) was removed by 11.8%, 91.2% and 98.6% at pH of 0.8, 2.0 and 3.5, respectively, indicative of enhanced Pb(II) reduction with pH in the tested pH range. The results showed that Ag/TiO2 displayed superior catalytic activity to TiO2, highlighting the potential of using Ag/TiO2 as a more effective catalyst for photocatalytic Pb(II) reduction.
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DOI：
10.1016/s1010-6030(97)00005-1
发表时间：
1997-07
影响因子：
4.3
作者：
K. T. Ranjit;B. Viswanathan
通讯作者：
K. T. Ranjit;B. Viswanathan
影响因子：
22.1
作者：
L. Murruni;F. Conde;G. Leyva;M. Litter
通讯作者：
L. Murruni;F. Conde;G. Leyva;M. Litter
影响因子：
3.3
作者：
Kawahara, K;Suzuki, K;Tatsuma, T
通讯作者：
Tatsuma, T
影响因子：
5.3
作者：
Herrmann, JM
通讯作者：
Herrmann, JM
影响因子：
11.4
作者：
KORMANN, C;BAHNEMANN, DW;HOFFMANN, MR
通讯作者：
HOFFMANN, MR