p-n异质结BiPO4/Ag3PO4的制备及其增强的模拟太阳光活性
BiPO4/Ag3PO4 p-n Heterojunction with Enhanced Photocatalytic Activity under Simulated Sunlight Irradiation
作者单位E-mail
王昭华 东北师范大学环境学院, 长春 130117  
蔡琼瑶 东北师范大学环境学院, 长春 130117  
叶挺铭 东北师范大学环境学院, 长春 130117  
郭英娜 东北师范大学化学学院, 长春 130024  
耿直 东北师范大学环境学院, 长春 130117  
杨霞 东北师范大学环境学院, 长春 130117 yangx881@nenu.edu.cn 
于洪斌 东北师范大学环境学院, 长春 130117 yuhb108@nenu.edu.cn 
摘要: 采用一步水热合成法制备了BiPO4、Ag3PO4和BiPO4/Ag3PO4复合光催化剂,通过X射线粉末衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、紫外-可见漫反射(UV-Vis DRS)等表征手段对其组成结构、形貌及光吸收性质进行了表征,结果表明Ag3PO4呈块状结构,BiPO4则分布在其表面,形成的BiPO4/Ag3PO4复合光催化剂具有单斜相和立方晶相结构,带边吸收拓宽至571 nm。以甲基橙和加替沙星为目标污染物,考察了BiPO4/Ag3PO4复合光催化剂在模拟太阳光照射下的降解矿化能力,结果表明复合催化剂比单一催化剂的降解矿化能力更强,稳定性更好。此外,自由基捕获实验表明空穴是该光催化过程中的主要活性物种,·O2-次之。p-n异质结的形成使BiPO4/Ag3PO4复合光催化剂具有较强的电子空穴分离能力是光催化活性提高的主要原因,这与光电流和电化学阻抗谱测试结果相一致。基于以上结果,文中对BiPO4/Ag3PO4光催化降解有机污染物的机理进行了推测。
关键词: BiPO4/Ag3PO4  光催化  模拟太阳光  甲基橙  加替沙星
基金项目: 国家自然科学基金(No.51478095,51508078,51378098)、新世纪优秀人才支持计划(No.NCET-13-0723)、吉林省科技发展计划(No.20160520023JH)、国家水体污染治理重大专项(2014ZX07201-011-004-2)和外国专家千人计划(No.WQ20142200209)资助项目
Abstract: BiPO4,Ag3PO4 and BiPO4/Ag3PO4 heterostructure photocatalysts were synthesized by one-step hydro-thermal method.X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),scanning electron microscope (SEM) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) techniques were used to characterize morphology,crystal structure,and absorption spectrum.The SEM results showed that the BiPO4/Ag3PO4 sample was in blocky structure and BiPO4 distributed on the surface of Ag3PO4.The XRD of BiPO4/Ag3PO4 sample displayed monoclinic and cubic crystal structure.The UV-Vis DRS spectra results indicated that the BiPO4/Ag3PO4 sample displayed obviously red shifts compared to BiPO4 and the light absorption range broaden to 571 nm.Moreover,the photocatalytic activity was evaluated by photodegradation of methyl orange (MO) and gatifloxacin solution under simulated sunlight irradiation.BiPO4/Ag3PO4 exhibits higher degradation and mineralized activities and the better stability on degradation of methyl orange and gatifloxacin than the single BiPO4 and Ag3PO4.Moreover,the test of active radical showed that the h+ was the main active radical in the degradation process,·O2- was weaker.The enhanced photocatalytic activity and stability of BiPO4/Ag3PO4 was mainly attributes to the formation of p-n heterojunction interface in BiPO4/Ag3PO4 which facilitated the transfer and separation of photogenerated electron-hole pairs confirmed by the results of transient photocurrent response and electrochemical impedance spectroscopy measurement.Based on the above results,the photocatalytic mechanism for organics degradation over BiPO4/Ag3PO4 was proposed.
Keywords: BiPO4/Ag3PO4  photocatalytic  simulated sunlight  methyl orange  gatifloxacin
投稿时间:2017-01-04 修订日期:2017-05-09
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王昭华,蔡琼瑶,叶挺铭,郭英娜,耿直,杨霞,于洪斌.p-n异质结BiPO4/Ag3PO4的制备及其增强的模拟太阳光活性[J].无机化学学报,2017,33(7):1196-1204.
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