超薄BiOI/BiOBr复合材料的制备及降解羟丙基胍胶的性能研究

目的 在油田压裂返排液中,由于含有大量成分复杂且稳定的有机物,传统方法处理有限,采用光催化环保技术进行处理的研究.方法 以BiOBr和BiOI为单体,采用原位合成法分别制备BiOI/BiOBr和U-BiOI/BiOBr复合体,并通过XRD、AFM、SEM、TEM、DRS和BET等手段表征其结构、组成、厚度、形貌和孔径大...

Preparation of ultrathin BiOI/BiOBr composites and performance study in degradation of hydroxypropyl guanidine gum

ObjectiveDue to large amount of complex and stable organic matters in oilfield fracturing flowback fluid, the effects of traditional treatment method would be limited, and the photocatalytic technology was assessed in this study. MethodsBiOI/BiOBr and U-BiOI/BiOBr complexes were prepared by in-situ synthesis method using BiOBr and BiOI as monomers. Their structures, compositions, thickness, morphology and pore size were characterized by XRD, AFM, SEM, TEM, DRS and BET. Taking hydroxypropyl guanidine gum in fracturing flowback fluid as the photocatalytic degradation reaction model, the photocatalyst activity was investigated, and the effects of the dosage of photocatalyst and the concentration of hydroxypropyl guanidine gum on the degradation effect were determined. ResultsFor 100 mL hydroxylpropyl guanidine gum solution with mass concentration of 200 mg/L, when the dosages of BiOI/BiOBr and U-BiOI/BiOBr were 120 mg and the reaction time was 60 min, the degradation rate of hydroxylpropyl guanidine gum could reach 73.0% and 77.2%, respectively. Besides, the degradation rate of hydroxypropyl guanidine gum by U-BiOI/BiOBr was better than that by BiOI/BiOBr. ConclusionsThe degradation of hydroxypropyl guanidine gum by photocatalytic oxidation technology provides a new idea and theoretical support for treating high contents of organic pollutants in fracturing flowback fluid from oil and gas fields.