Degradation and Mineralization of Benzohydroxamic Acid by Synthesized Mesoporous La/TiO₂.
Degradation and Mineralization of Benzohydroxamic Acid by Synthesized Mesoporous La/TiO₂.
复制标题
合成介孔La/TiO2降解矿化苯甲异羟肟酸
DOI：
10.3390/ijerph13100997
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发表时间：
2016-10-10
影响因子：
--
通讯作者：
Wu M
中科院分区：
文献类型：
--
作者：
Luo X;Wang J;Wang C;Zhu S;Li Z;Tang X;Wu M
采用溶胶-凝胶法合成了稀土元素La掺杂的二氧化钛(La/TiO2O4)。以苯并异羟肟酸为目标污染物，考察了La/TiO2光催化活性。用X射线衍射仪、X射线光电子能谱、紫外-可见漫反射光谱、比表面积和孔隙率、扫描电子显微镜和透射电子显微镜对所制备材料的物化性能进行了表征。结果表明，La的掺杂抑制了二氧化钛的晶体生长，增加了其比表面积，扩大了其对可见光的响应，从而提高了其光催化活性。掺杂率为0.75%的La/TiO2光催化剂在500℃焙烧，在300W汞灯照射下对苯异羟肟酸的光催化降解活性最高。在pH值为4.4、La/−比为0.5g·L−1的溶液中，辐照120min后，初始浓度为30 mg·L的苯异羟肟酸的脱色率为94.1%，总有机碳的脱除率为88.5%。此外，经过4次循环后，La/TiO2光催化降解苯异羟肟酸仍保持较高的活性。并对界面电荷转移过程进行了假设。
Rare earth element La-doped TiO2 (La/TiO2) was synthesized by the sol-gel method. Benzohydroxamic acid was used as the objective pollutant to investigate the photocatalytic activity of La/TiO2. The physicochemical properties of the prepared materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, specific surface area and porosity, scanning electron microscopy and transmission electron microscopy. As a result, the doping of La could inhibit the crystal growth of TiO2, increase its specific surface area and expand its response to visible light, thus improving its photocatalytic activity. La/TiO2 with the doping ratio of 0.75% calcined at 500 °C, showing the highest photocatalytic activity to degrade benzohydroxamic acid under the irradiation of 300 W mercury lamp. About 94.1% of benzohydroxamic acid with the original concentration at 30 mg·L−1 was removed after 120 min in a solution of pH 4.4 with an La/TiO2 amount of 0.5 g·L−1. Furthermore, 88.5% of the total organic carbon was eliminated after 120 min irradiation. In addition, after four recycling runs, La/TiO2 still kept high photocatalytic activity on the photodegradation of benzohydroxamic acid. The interfacial charge transfer processes were also hypothesized.
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