Department of Science and Humanities, Physics, Karunya Institute of Technology and Sciences, Coimbatore 641 114, India.
Department of Science and Humanities, Physics, Karunya Institute of Technology and Sciences, Coimbatore 641 114, India; Department of Science and Humanities, Nanoscience and Technology, Karunya Institute of Technology and Sciences, Coimbatore 641 114, India.
Ultrason Sonochem. 2018 Jul;45:123-132. doi: 10.1016/j.ultsonch.2018.02.002. Epub 2018 Feb 6.
Visible light induced photocatalyst BiVO with monoclinic scheelite structure has been synthesised via sol gel method assisted by ultrasonication. The prepared samples were characterised using X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffused reflectance spectroscopy (DRS) techniques. The photocatalytic efficiency was evaluated by decolourisation of MB under visible light irradiation. The effect of ultrasound output power on the properties of BiVO during and after preparation by sol-gel method has been compared with normal agitated sample (As prepared). The power of ultrasonic vibration has been varied and an ideal output power which yields better catalytic efficiency is determined. BiVO sonicated with 80 W during preparation 80 W (D) exhibited relatively high surface area, better surface morphology and better catalytic efficiency compared to other samples which were sonicated with 100, 160 and 200 W. The results signify that the photodegradation rate of BiVO 80 W (D) sample is high up to 96% in 90 min compared to other samples. Change in morphology leading to better catalytic efficiency was obtained just by exposing the sample to ultrasonic radiation without addition of any surfactant. The recovery test showed that the sample was stable for four consecutive cycles. Using radical test, a reasonable mechanism for photodegradation has been proposed.
采用溶胶-凝胶法并辅以超声辅助合成了具有单斜白钨矿结构的可见光阴极 BiVO。使用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、紫外-可见漫反射光谱（DRS）技术对制备的样品进行了表征。通过在可见光照射下使 MB 褪色评价了光催化效率。比较了溶胶-凝胶法制备过程中和制备后超声输出功率对 BiVO 性质的影响，与正常搅拌样品（原样）进行了比较。改变了超声振动的功率，并确定了产生更好催化效率的理想功率。与用 100、160 和 200 W 超声处理的其他样品相比，在制备过程中用 80 W 超声处理的 BiVO 80 W（D）表现出相对较高的表面积、更好的表面形态和更好的催化效率。结果表明，BiVO 80 W（D）样品在 90 分钟内的光降解率高达 96%，高于其他样品。仅通过将样品暴露于超声辐射而无需添加任何表面活性剂即可获得导致更好催化效率的形态变化。回收测试表明，该样品在连续四个循环中稳定。通过自由基测试，提出了一种合理的光降解机制。
