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首页> 外文期刊>RSC Advances >Metal doped titanate photo catalysts for the mineralization of congo red under visible irradiation
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Metal doped titanate photo catalysts for the mineralization of congo red under visible irradiation

机译：金属掺杂钛酸酯光催化剂在可见光下矿化刚果红

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Strontium titanate catalysts and titania were synthesized by the sol-gel method. 1 mol% nickel/ruthenium was doped on the strontium titanate catalyst to shift its optical response to the visible region. UV-diffuse reflectance spectral analysis confirms the red shift with the band gap of 1.9 eV and 2.13 eV for the Ni and Ru doped strontium titanate catalysts, respectively. The catalysts were characterized using various instrumental techniques such as X-ray diffraction (XRD), UV-diffuse reflectance spectroscopy (UV-DRS), BET surface area analysis, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS), Transmission Electron Microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of bare TiO2, bare strontium titanate and metal doped strontium titanate catalysts were evaluated towards the decolourisation/degradation of congo red under UV, visible and solar irradiation and monitored by a UV-visible spectrophotometer and TOC analyser. Among the catalysts nickel doped strontium titanate completely decolourised CR in the shortest reaction time (300 min), and hence it was subjected to decolourise textile effluent. It was found to be very effective in the degradation of textile effluent as it showed a significant reduction in the TOC. Kinetic studies indicate that the degradation of congo red followed pseudo first order kinetics. The recycling test confirmed that the most active nickel doped strontium titanate catalyst is highly photostable.
机译：通过溶胶-凝胶法合成钛酸锶催化剂和二氧化钛。将1 mol％的镍/钌掺杂在钛酸锶催化剂上，以将其光学响应转移到可见光区域。紫外-漫反射光谱分析证实了掺杂镍和钌的钛酸锶锶催化剂的带隙分别为1.9 eV和2.13 eV。使用各种仪器技术对催化剂进行了表征，例如X射线衍射（XRD），紫外扩散反射光谱（UV-DRS），BET表面积分析，拉曼光谱，傅里叶变换红外光谱（FTIR），能量扫描电子显微镜色散光谱（SEM-EDS），透射电子显微镜（TEM）和X射线光电子光谱（XPS）。评估了裸露的TiO2，裸露的钛酸锶锶和金属掺杂的钛酸锶锶催化剂在紫外，可见光和太阳光照射下对刚果红的脱色/降解，并通过紫外可见分光光度计和TOC分析仪进行了监测。在这些催化剂中，掺杂镍的钛酸锶锶在最短的反应时间（300分钟）内使CR完全脱色，因此使织物流出物脱色。发现它对纺织品废水的降解非常有效，因为它显示出TOC的显着降低。动力学研究表明，刚果红的降解遵循伪一级动力学。循环测试证实，活性最高的掺镍钛酸锶锶催化剂具有很高的光稳定性。

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