修饰型TiO2锡锑电极的制备及其在钻井废水处理中的应用

Preparation of Sb-doped SnO2 electrode with titanium dioxide nanotubes on Ti substrate and its application in drilling wastewater treatment

为了解决传统锡锑电极电催化氧化效果偏低、涂层易脱落的问题,使用阳极氧化法,在钛基底表面制备垂直生长的二氧化钛纳米管(TiO2-NTs),然后在此基底上采用电沉积法制备出锡锑电极(TiO2-NTs/SnO2-Sb)。结果表明,相比没有二氧化钛纳米管的锡锑电极(Ti/SnO2-Sb),TiO2-NTs/SnO2-Sb电极的析氧电位从1.9 V增加到2.03 V,电极具有较高的羟基自由基生成能力和更高的电流效率,促进了苯酚的矿化。TiO2-NTs/SnO2-Sb电极对实际钻井废水具有较好的脱色效果,COD去除率高达81.4%,且能够有效地改善阳极的"中毒效应"。

This study aimed to address the low electro-catalytic oxidation effect and coating falling off easily of traditional Sb-doped SnO2 electrode. The vertically grown titanium dioxide nanotubes(TiO2-NTs) structure was first formed on the Ti plate by anodization, then the Sb-doped SnO2 electrode(TiO2-NTs/SnO2-Sb) was prepared on this modified Ti plate by electrodeposition. The results showed that compared to the Sb-doped SnO2 electrode without titanium dioxide nanotubes(Ti/SnO2-Sb) on the Ti plate, the oxygen evolution potential of TiO2-NTs/SnO2-Sb electrode increased from 1.9 V to 2.03 V, which contributed to the phenol mineralization enhancement due to its high capacity for hydroxyl radicals generation and higher current efficiency. The TiO2-NTs/SnO2-Sb electrode can completely remove the color of the drilling wastewater, and the COD removal rate was as high as 81.4%. In addition, the "Poisoning effect" of the anode was alleviated during the treatment of drilling wastewater.