BN诱导BiOI富氧{110}面的暴露并增强其可见光催化氧化性能  

Selective Exposure of BiOI Oxygen-Rich{110}Facet Induced by BN Nanosheets for Enhanced Photocatalytic Oxidation Performance

作　　者：郑倩 曹玥晗 黄南建 张瑞阳[2] 周莹[1,2] Qian Zheng;Yuehan Cao;Nanjian Huang;Ruiyang Zhang;Ying Zhou(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;The Center of New Energy Materials and Technology,School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学,油气藏地质及开发工程国家重点实验室,成都610500 [2]西南石油大学,新能源与材料学院,新能源材料及技术研究中心,成都610500

出　　处：《物理化学学报》2021年第8期74-82,共9页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(U1862111);四川省科技计划(2020ZDZX0008);成都市国际科技合作项目(2017-GH02-00014-HZ);西南石油大学第十九期(2019-2020学年)大学生课外开放实验重点项目(KSZ19516)资助。

摘　　要：光催化剂的暴露晶面极大地影响其光催化性能。因此,本文以BiOI为模型材料,提出了一种提高材料光催化氧化性能的新策略。本文中,BN纳米片的成功复合诱导BiOI纳米片更倾向于暴露富含表面晶格氧原子的{110}晶面。表面晶格氧原子可以直接参与NO的氧化反应,生成NO_(2)。可见光催化氧化NO性能测试表明,BiOI复合BN后,NO的去除率可达44.2%,相比于纯相BiOI(1.4%)提升接近30倍。本文通过构建2D/2D光催化剂来调控材料富氧晶面的暴露,为增强催化剂的光催化氧化性能提供了新的策略。Photocatalytic oxidation is a promising technology for governing emission of environmental pollutants and managing energy crisis.Typically,the photocatalytic performance of photocatalysts is highly dependent on the type of exposed crystal surfaces.As a semiconductor oxide photocatalyst,the different exposed crystal surfaces of bismuth oxyiodide(BiOI)exhibit different photocatalytic oxidation performances.In this study,we chose BiOI as the model material and provided a novel method to improve the photocatalytic oxidation performance by regulating the main exposed crystal facets.Using boron nitride(BN)nanosheets as the templates,two-dimensional/two-dimensional(2D/2D)BiOI/BN nanocompounds were fabricated via an in situ growth method.Owing to the electrostatic interaction,the positively charged BiOI{001}facets prefer to contact the negatively charged BN{001}facet,thus inducing the exposure of BiOI{110}facets.This was identified via X-ray diffraction and transmission electron microscopy analyses.Compared with BiOI{001}facets,there were more lattice oxygen atoms in the BiOI{110}facets.Thus,the exposure of BiOI{110}facets would promote more surface lattice oxygen atoms exposed on the surface of BiOI,which was confirmed by X-ray photoelectron spectroscopy and density functional theory calculations.To evaluate the photocatalytic oxidation performance of BiOI/BN,the photocatalytic NO oxidation reaction was tested under visible light irradiation(λ>420 nm).Among all the nanocompounds,the BiOI/BN-1.0:1.4 nanocompound exhibited the best NO oxidation ratio of 44.2%,which was almost 30 times higher than that of pristine BiOI(1.4%).The enhanced photocatalytic activity could be attributed to the following two aspects.One,the successful combination of BN effectively promoted the separation of photogenerated carriers,which was identified by steady-state and time-resolved fluorescence spectra,transient photocurrent responses,and electrochemical impedance spectra.Two,benefiting from the introduction of BN nanosheets,BiOI tends to mai

关 键 词：碘氧铋 氮化硼 光催化氧化反应 富氧晶面 晶格氧 

分 类 号：O643[理学—物理化学]