Synthesis, characterization and application of bismuth and boron Co-doped TiO2: A visible light active photocatalyst
Synthesis, characterization and application of bismuth and boron Co-doped TiO2: A visible light active photocatalyst
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可见光活性光催化剂铋硼共掺TiO2的合成、表征及应用
DOI：
10.1016/j.cej.2012.11.080
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发表时间：
2013-02-01
影响因子：
15.1
通讯作者：
Nasir, Muhammad
中科院分区：
文献类型：
--
作者：
Bagwasi, Segomotso;Tian, Baozhu;Nasir, Muhammad
采用改进的溶胶-凝胶法成功制备了铋、硼共掺杂的二氧化钛纳米粒子。用多种光谱和分析技术对产物进行了表征，以确定其结构、形态、光吸收和光催化性能。结果表明，所有样品都是由具有介孔结构的高度结晶的锐钛矿组成。实验结果进一步表明，在二氧化钛晶格中掺入了铋和硼，其中铋以Bi3+的形式取代了钛，B以代位和间隙B的形式掺杂。铋的存在促进了B进入二氧化钛晶格。X-射线衍射仪和透射电子显微镜分析表明，所有的掺杂剂(B和Bi)都有抑制锐钛矿型二氧化钛颗粒生长的能力，其中铋的抑制作用更强。与纯TiO2光催化剂相比，BiB复合掺杂样品在可见光照射下对酸性橙7(AO7)和2，4-二氯苯酚具有更好的降解活性。在450℃焙烧的3%的BiB-TiO2光催化剂的活性最高。该样品的优异性能归因于样品的高比表面积、吸收可见光的能力、有效的电荷分离以及与适量的B和Bi在共掺杂样品中的协同作用所改善的e(-)转移。研究发现，铋物种在共掺杂样品中起着关键作用。在可见光照射下，在3%的BiB-TiO2光催化降解AO7过程中，超氧阴离子自由基是最活跃的物种。(C)2012爱思唯尔B.V.保留所有权利。
Bismuth and Boron co-doped TiO2 nanoparticles were successfully prepared by a modified sol-gel method. The products were characterized with various spectroscopic and analytical techniques to determine their structural, morphological, light absorption and photocatalytic properties. The results reveal that all the samples consist of highly crystalline anatase with mesoporous structures. The experimental results further indicate that Bi and B species have been doped into the crystal lattice of TiO2 with Bi substituting Ti in the form of Bi3+ and B doped in the form of substitutional and interstitial B. The presence of Bi species facilitated the incorporation of B into the crystal lattice of TiO2. XRD and TEM analysis show that all the dopants (B and Bi) have the ability to inhibit particle growth of anatase TiO2 with more inhibition exhibited by Bi. Compared to pure TiO2, B and Bi singly doped TiO2; Bi-B co-doped samples showed better activities for degradation of Acid Orange 7 (AO7) and 2, 4-dichlorophenol under visible light irradiation. The highest activity is observed for 3% Bi-B-TiO2 calcined at 450 degrees C. The superior performance of this sample is ascribed to the high surface area, ability to absorb in visible light, efficient charge separation as well as improved e(-) transfer associated with the cooperate effects of appropriate amounts of B and Bi in co-doped sample. Bi species are found to play a pivotal role in the co-doped samples. Superoxide radicals are the most reactive species in degradation of AO7 over 3% Bi-B-TiO2 under visible light irradiation. (c) 2012 Elsevier B.V. All rights reserved.