Synthesis of N–Si co-doped TiO2 nanoparticles for the photodegradation of phenol
Synthesis of N–Si co-doped TiO2 nanoparticles for the photodegradation of phenol
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DOI：
10.1007/s11144-014-0721-3
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Jiguo Huang;Meng-yang Zheng;Shuo Pang;Li-guo Liu;Xiao-guang Zhao;Li-e Dong;Xing-juan Liu
中科院分区：
文献类型：
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作者：
Jiguo Huang;Meng-yang Zheng;Shuo Pang;Li-guo Liu;Xiao-guang Zhao;Li-e Dong;Xing-juan Liu
采用SiCl 4和TiCl 4共水解法制备了N-Si共掺杂纳米TiO 2光催化降解苯酚，并研究了H2 O2的改性效果。表征结果表明，Si在TiO 2晶格中的掺杂量有限，在偏聚的非晶SiO2中存在多余的Si。光催化剂的平均晶粒尺寸随着Si掺杂比例的增加而从14.8减小到5.5。样品的吸收边发生了明显的红移，最大吸收边达到526 nm。N和Si共掺杂取代Ti，形成Ti-O-Si和O-Ti-N键。H2 O2改性后的光催化剂分散性好，分子结构发生了变化。Si掺杂的TiO 2光催化剂的降解效果优于未掺杂的TiO 2光催化剂，H2 O2改性不能进一步提高N-Si掺杂TiO 2的光催化活性。对于苯酚的光降解，最佳的Si/Ti摩尔比为1：4，最佳的焙烧温度为650 °C。结果表明，在光催化剂中，O/Ti、N/Ti、Si/Ti的摩尔比分别为0.54、0.19、0.29，在太阳光照射下，苯酚的去除率为94.4%。N-Si共掺杂TiO 2的重复使用性较好。
N–Si co-doped TiO2nanoparticles for the photodegradation of phenol were prepared by SiCl4and TiCl4co-hydrolysis and the effect of H2O2modification was studied. The characterization results revealed that the Si doped into the TiO2lattice was limited and the redundant silicon existed in segregated amorphous silica. The average crystallite size of the photocatalysts reduced from 14.8 to 5.5 with increasing Si doping ratio. The absorption edges of the as-prepared samples got an obvious red shift in which the best one reached 526 nm. N and Si co-doped into the photocatalysts replaced Ti and formed the Ti–O–Si and O–Ti–N link-ages. The photocatalysts modified by H2O2were well dispersed and changed the molecular structure. The degradation effect of the used Si doped photocatalysts was better than for undoped photocatalysts, and the H2O2modification could not further enhance the photocatalytic activity for N–Si doped TiO2. For the photodegradation of phenol, the optimal molar ratio of Si/Ti and the calcination temperature was 1:4 and 650 °C, respectively. For the optimal photocatalyst, the molar ratios of O/Ti, N/Ti, and Si/Ti were 0.54, 0.19, 0.29, and the phenol removed 94.4 % in 6 h under solar light. The reusability of N–Si co-doped TiO2was relatively good.