Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
J Hazard Mater. 2012 Jan 15;199-200:247-54. doi: 10.1016/j.jhazmat.2011.11.007. Epub 2011 Nov 9.
This study investigated the methylene blue (MB) decolorization through heterogeneous UV-Fenton reaction catalyzed by V-Ti co-doped magnetites, with emphasis on comparing the contribution of V and Ti cations on improving the adsorption and catalytic activity of magnetite. In the well crystallized spinel structure, both Ti(4+) and V(3+) occupied the octahedral sites. Ti(4+) showed a more obvious effect on increasing specific surface area and superficial hydroxyl amount than V(3+) did, resulting in a significant improvement of the adsorption ability of magnetite to MB. The UV introduction greatly accelerated MB degradation. And magnetite with more Ti and less V displayed better catalytic activity in MB degradation through heterogeneous UV-Fenton reaction. The transformation of degradation products and individual contribution from vanadium and titanium on improving adsorption and catalytic activity of magnetite were also investigated. These new insights are of high importance for well understanding the interface interaction between contaminants and metal doped magnetites, and the environmental application of natural and synthetic magnetites.
本研究通过 V-Ti 共掺杂磁铁矿的非均相 UV-Fenton 反应研究了亚甲基蓝（MB）的脱色作用，重点比较了 V 和 Ti 阳离子对改善磁铁矿吸附和催化活性的贡献。在结晶良好的尖晶石结构中，Ti(4+)和 V(3+)都占据了八面体位置。Ti(4+)比 V(3+)更明显地提高了比表面积和表面羟基数量，从而显著提高了磁铁矿对 MB 的吸附能力。UV 的引入大大加速了 MB 的降解。在非均相 UV-Fenton 反应中，具有更多 Ti 和更少 V 的磁铁矿对 MB 的降解表现出更好的催化活性。还研究了降解产物的转化以及钒和钛对改善磁铁矿吸附和催化活性的单独贡献。这些新的见解对于深入了解污染物与金属掺杂磁铁矿之间的界面相互作用以及天然和合成磁铁矿的环境应用具有重要意义。
