超薄BiOI/BiOBr复合材料的制备及降解羟丙基胍胶的性能研究

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

关键词:  U-BiOI/BiOBr复合体  羟丙基胍胶  原位合成法  光催化

Key words:  U-BiOI/BiOBr complex  hydroxypropyl guanidine gum  in situ synthesis  photocatalysis

摘要:

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、形貌和孔径大小。以压裂返排液中羟丙基胍胶为光催化降解反应模型,考察了光催化剂活性,测定了光催化剂加量、羟丙基胍胶含量等因素对降解羟丙基胍胶效果的影响。结果 在羟丙基胍胶溶液为100 mL、质量浓度为200 mg/L的情况下,BiOI/BiOBr和U-BiOI/BiOBr的投加量均为120 mg,反应时间为60 min对羟丙基胍胶污染物降解率分别为73.0%和77.2%,U-BiOI/BiOBr降解羟丙基胍胶的效果优于BiOI/BiOBr。结论 通过采用光催化氧化技术降解羟丙基胍胶,为油气田压裂返排液中大量有机污染物的环保处理提供了新思路和理论支撑。

Abstract:

Objective Due 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. Methods BiOI/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. Results For 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. Conclusion sThe 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.