摘要
铁酸铋其较窄的带隙、较高的化学稳定性、较好的可见光响应能力等优势使之成为降解多种废水的有效半导体光催化剂。采用静电纺丝法制备纯相BiFeO_(3)纳米纤维,通过煅烧温度、聚乙烯吡咯烷酮(polyvinyl pyrrolidone,PVP)浓度、收集距离、纺丝电压、推料速度等单因素试验得到对刚果红最佳降解条件后,选择对光催化效率有显著影响的4个因素,进行四因素三水平的响应面分析试验,经过优化得到最优PVP浓度为12.17 wt%、收集距离为14.07 cm、纺丝电压为12.03 kV、推料速度为0.74μm/s,在此条件下BiFeO_(3)光催化降解刚果红的效率可达90.43%。利用X射线衍射、扫描电子显微镜、拉曼光谱、傅里叶变换红外光谱对铁酸铋纳米纤维进行物相分析和形貌表征,结果表明静电纺丝法制备的纯相BiFeO_(3)纳米纤维表面粗糙有明显的颗粒感,呈一维棒管状结构,尺寸约为300 nm,这种纳米棒管结构具有更大的比表面积及更多的活性位点,能够提高BFO光催化降解效率。
Bismuth ferrite has become an effective semiconductor photocatalyst for the degradation of various wastewaters due to its narrow band gap,high chemical stability,and good visible light response.Pure phase BiFeO_(3)nanofibers were prepared by electrospinning method.The optimal degradation conditions for Congo Red were obtained through single factor experiments such as calcination temperature,PVP(polyvinyl pyrrolidone)concentration,collection distance,spinning voltage,and pushing speed.Four factors that significantly affect photocatalytic efficiency were selected for response surface analysis experiments with four factors and three levels.After optimization,the optimal PVP concentration was 12.17 wt%,collection distance was 14.07 cm,and spinning voltage was 12.03 kV The pushing speed is 0.74μm/s,and under this condition,the efficiency of BiFeO_(3)photocatalytic degradation of Congo red can reach 90.43%.The phase analysis and morphology characterization of bismuth ferrite nanofibers were carried out using X-ray diffraction,scanning electron microscopy,Raman spectroscopy,and Fourier transform infrared spectroscopy.The results show that the pure phase BFO nanofibers prepared by electrospinning has a rough surface and obvious particle sensation,presenting a one-dimensional rod-shaped structure with a size of about 300 nm.This nanorod-shaped structure has a larger specific surface area and more active sites,Can improve the photocatalytic degradation efficiency of BFO.
作者
李艳美
张佳睿
匡代洪
阿瓦拜克力·肉苏里
LI Yan-mei;ZHANG Jia-rui;KUANG Dai-hong;AWABAIKELI Rousuli(College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;College of Mathematics and Science,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《科学技术与工程》
北大核心
2025年第2期862-870,共9页
Science Technology and Engineering
基金
新疆维吾尔自治区自然科学基金(2022D01A201)。
关键词
铁酸铋
静电纺丝
响应面分析
Bismuth ferrite
electrospinning
response surface analysis
作者简介
第一作者:李艳美(1999-),女,汉族,四川邻水人,硕士研究生。研究方向:BiFeO_(3)纳米材料光催化降解有机污染物。E-mail:1224902796@qq.com;通信作者:匡代洪(1977-),男,汉族,湖南衡阳人,博士,副教授,硕士研究生导师。研究方向:环境功能材料的制备及性能。E-mail:416799621@qq.com。
