BiPO_(4)/g-C_(3)N_(4)异质结光催化剂的制备及其光催化性能  

Preparation and photocatalytic properties of BiPO_(4)/g-C_(3)N_(4)heterojunction photocatalyst

作　　者：肖东彩[1] 侯国安[1] 赵艳敏[1] XIAO Dongcai;HOU Guoan;ZHAO Yanmin(Department of Chemical and Biological Engineering,Yinchuan Institute of Energy,Yinchuan 750105,China)

机构地区：[1]银川能源学院化学与生物工程学院,宁夏银川750105

出　　处：《印染》2023年第11期68-73,共6页China Dyeing and Finishing

基　　金：银川能源学院科学技术研究项目(2021-KY-Y-01);宁夏自然科学基金项目(2020AAC03275)。

摘　　要：以BiPO_(4)和g-C_(3)N_(4)为前驱体,采用混合法制备了BiPO_(4)/g-C_(3)N_(4)复合光催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电镜(TEM)、高分辨率透射电镜(HRTEM)、紫外可见漫反射光谱(UV-vis DRS)和荧光光谱(PL)等技术对BiPO_(4)/g-C_(3)N_(4)复合光催化剂的物相晶型、微观形貌以及光催化性质进行了表征。以甲基橙(MO)溶液为模拟染料溶液,对BiPO_(4)/g-C_(3)N_(4)复合光催化剂的光催化活性和循环使用稳定性进行评价,并对其光催化降解MO染料溶液机理进行了探究。结果表明:一维BiPO_(4)纳米棒锚定在二维g-C_(3)N_(4)纳米片表面形成异质结,拓宽了光谱范围,提高了对可见光的响应强度,抑制光电子-空穴的复合,提高了光催化活性。可见光照射30 min,BiPO_(4)/g-C_(3)N_(4)复合光催化剂对MO染料溶液的光催化降解率为90.7%;循环使用5次后,光催化降解率仅下降1.5%。BiPO_(4)/g-C_(3)N_(4)复合光催化剂光催化降解MO染料溶液机理符合Z scheme机制。BiPO_(4)/g-C_(3)N_(4)composite photocatalyst is prepared by mixing method using BiPO_(4)and g-C_(3)N_(4)as pre⁃cursors.X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM),UV-vis diffuse reflectance spectroscopy(UV-vis DRS)and fluorescence spectroscopy(PL)are used to characterize the phase,morphology and photo⁃catalytic properties of BiPO_(4)/g-C_(3)N_(4)composite photocatalysts.The photocatalytic activity and recycling stability of BiPO_(4)/g-C_(3)N_(4)composite photocatalyst are evaluated by using Methyl Orange(MO)solution as simulated dye solution,and the mechanism of photocatalytic degradation of MO dye solution is explored.The results show that one-dimensional BiPO_(4)nanorods are anchored on the surface of two-dimensional g-C_(3)N_(4)nanosheets to form heterojunctions.The formation of heterojunctions broadens the spectral range,improves the response intensity to visible light,inhibits the recombination of photoelectron-holes,and improves the pho⁃tocatalytic activity.Under visible light irradiation for 30 min,the photocatalytic degradation rate of BiPO_(4)/g-C_(3)N_(4)composite photocatalyst for MO dye solution is 90.7%.After 5 cycles,the photocatalytic degradation rate de⁃creases by only 1.5%.The mechanism of photocatalytic degradation of MO dye solution by BiPO_(4)/g-C_(3)N_(4)com⁃posite photocatalyst conforms to Z scheme.

关 键 词：光催化 BiPO_(4)/g-C_(3)N_(4) 甲基橙 异质结 

分 类 号：O643.36[理学—物理化学] X703[理学—化学] O644.1[环境科学与工程—环境工程]