【摘要】 以五水硝酸铋、九水硝酸铁为原料，采用水热法制备出铁酸铋微粒（BiFeO₃,BFO）。探究前驱体溶液环境碱度、矿化剂（NaOH）浓度、水热反应温度和时间对铁酸铋微粒晶体结构、形貌尺寸及催化性能的影响；并进一步以聚乙烯吡咯烷酮（PVP）、十六烷基三甲基溴化铵（CTAB）对铁酸铋进行表面改性，制备出BFO-PVP与BFO-CTAB。利用场发射扫描电子显微镜（FE-SEM）、18 kW转靶X射线衍射仪（XRD）、傅立叶红外显微成像光谱仪（FTIR）、X射线光电子能谱仪（XPS）、顺磁共振波谱仪（ESR/EPR）对制备的样品进行表征。结果表明，铁酸铋前驱体溶液的最低pH值为12,且当矿化剂浓度为3 mol/L,水热温度和时间分别为200℃、9 h时得到高结晶度的单相钙钛矿结构铁酸铋微粒，这种铁酸铋微粒形貌尺寸均一，分散性良好；当PVP和CTAB添加量分别为0.5 g/L、1.0 g/L时，改性后的铁酸铋对阳离子性罗丹明B（RhB）的降解效果最佳，反应速率常数分别为未改性铁酸铋的1.8倍和1.6倍。更多还原

【Abstract】 Bismuth ferrite particles（BiFeO₃/BFO） were successfully prepared by hydrothermal method with bismuth nitrate pentahydrate and iron nitrate nonahydrate as raw materials. The effects of environmental alkalinity, concentration of mineralizer（NaOH）, hydrothermal reaction temperature and time on the crystal structure, morphology and catalytic performance of bismuth ferrite particles were investigated. Furthermore, bismuth ferrite particles were surface modified to prepare sample BFO-PVP and BFO-CTAB with polyvinylpyrrolidone（PVP） and cetyl trimethyl ammonium bromide（CTAB）, respectively. The samples were characterized by field emission scanning electron microscope（FE-SEM）, X-ray diffractometer（XRD）, Fourier transform infrared spectrometer（FT-IR）, X-ray photoelectron spectrometer（XPS） and paramagnetic resonance spectrometer（ESR/EPR）. The results showed that high crystallinity bismuth ferrite particles with single phase perovskite structure could be obtained with the pH=12 of the precursor solution, 3 mol/L of mineralizer（NaOH） by hydrothermal reaction at 200 ℃ for 9 h, and they showed uniform morphology and good dispersibility. When the addition amount of PVP and CTAB was 0.5 g/L and 1.0 g/L, respectively, the modified bismuth ferrite displayed the best Fenton-like degradation effect on cationic rhodamine B. The reaction rate constants were 1.8 times and 1.6 times of unmodified bismuth ferrite, respectively.更多还原