Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, PR China; National Footwear Quality Supervision and Inspection Center (Beijing), China Leather and Footwear Industry Research Institute, Beijing, 100015, PR China.
National Footwear Quality Supervision and Inspection Center (Beijing), China Leather and Footwear Industry Research Institute, Beijing, 100015, PR China.
Chemosphere. 2017 Jul;179:75-83. doi: 10.1016/j.chemosphere.2017.03.084. Epub 2017 Mar 24.
Organotin compounds have been widely used in recent decades, however, the residential tributyltin (TBT) in environment has potential harmful effects on human health due to the disruption of endocrine system even at trace level. Herein, this work reports on an effective electro-field-assisted-photocatalytic technique for removal of TBT by applying an electric field to photocatalysis of as-prepared hierarchical TiO microspheres. The synthesis of catalytic materials is based on a self-assembly process induced by microwave-assisted solvothermal reaction. Hierarchical TiO microspheres consisting of nanowires can be obtained in short time with this facile method and possess high surface area and superior optical properties. As the catalyst, it was found that the reaction rate constant of electro-field-assisted-photocatalytic removal (0.0488 min) of TBT exhibited almost a 9 fold improvement as compared to that of photocatalysis (0.0052 min). The proposed mechanism of electro-field-assisted-photocatalytic removal of TBT was verified by using Sn-enriched TBT spike solution as an isotopic tracer. In addition, varying impacts from some key reaction conditions, such as voltage of potential, pH value and the presence of Cr and formaldehyde were also discussed. The overall satisfactory TBT removal performance of the proposed electro-field-assisted-photocatalysis procedure with hierarchical TiO microspheres, which was validated using actual tannery wastewater samples from three different kinds of tanning procedures. These attributes suggest that this electro-field-assisted-photocatalysis may have broad applications for the treatment of tannery wastewater.
有机锡化合物在最近几十年中得到了广泛的应用，然而，环境中的三丁基锡（TBT）由于对内分泌系统的干扰，即使在痕量水平下也可能对人体健康产生潜在的有害影响。在此，本工作报道了一种有效的电场辅助光催化技术，通过在光催化过程中施加电场来去除 TBT。催化材料的合成基于微波辅助溶剂热反应诱导的自组装过程。通过这种简单的方法可以在短时间内获得由纳米线组成的分级 TiO 微球，具有高比表面积和优异的光学性能。作为催化剂，发现 TBT 的电场辅助光催化去除（0.0488 min）的反应速率常数比光催化（0.0052 min）提高了近 9 倍。通过使用富含 Sn 的 TBT 尖峰溶液作为同位素示踪剂，验证了电辅助光催化去除 TBT 的机理。此外，还讨论了一些关键反应条件（如电势电压、pH 值以及 Cr 和甲醛的存在）的不同影响。采用实际制革废水进行验证，使用不同鞣制工艺的三种实际制革废水样品，证明了所提出的带有分级 TiO 微球的电场辅助光催化工艺具有令人满意的 TBT 去除性能。这些特性表明，该电场辅助光催化技术可能在制革废水处理方面具有广泛的应用前景。
