精细石油化工

通过构建Z型异质结,将钛酸钴(CoTiO₃)与钨酸铋(Bi_2WO₆)按摩尔比1∶2复合制备了CTO/BWO复合材料,用于高效降解废弃水基钻井液和压裂液中的聚合物,并以XRD、SEM、TEM、XPS等方法表征了复合材料的物相结构和表面形貌。实验结果表明:CTO/BWO复合材料在可见光和紫外光范围内均表现出优异的光吸收能力,且其光催化降解罗丹明B的效率显著高于单一材料;此外,CTO/BWO对油田常用的钻井液添加剂和压裂液稠化剂也表现出良好的降解效果,COD去除率均达到78.1%以上。光催化机理研究表明,CTO/BWO通过Z型异质结促进光生电子-空穴对的分离,生成更多的活性氧物种(如·OH、O₂~-和~1O₂),从而加速光催化反应。

A CTO/BWO composite material containing Z-scheme heterojunction was prepared by combining cobalt titanate(CoTiO₃) with bismuth tungstate(Bi_2WO₆) with a 1∶2 molar ratio, which was used to efficiently degrade polymers in waste water-based drilling fluids and fracturing fluids. The structure and morphology of the composite materials were confirmed by characterization methods such as XRD, SEM, TEM, XPS, etc. The experimental results demonstrate that the CTO/BWO composite material exhibits excellent light absorption capabilities in both visible and ultraviolet regions, and its photocatalytic degradation efficiency of Rhodamine B(RhB) is significantly higher than that of a single material. In addition, CTO/BWO shows good degradation effects on commonly used drilling fluid additives and fracturing fluid thickeners in oil fields, with COD removal rates exceeding 78.1%. Electron paramagnetic resonance(EPR) and electrochemical impedance spectroscopy(EIS) analyses revealed the photocatalytic mechanism of CTO/BWO, which involves promoting the separation of photogenerated electron-hole pair through the Z-scheme heterojunction, generating more reactive oxygen species(such as ·OH, O, and ~1O₂) to accelerate the photocatalytic reaction.