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 mainly expose the oxygen-rich{110}facets.As a result,the content of O on the BiOI surface increased from 38.3%to 46.6%.Thus,NO preferred to adsorb on the{110}facets of BiOI nanosheets,which was confirmed by theoretical and experimental results.More importantly,the adsorbed NO spontaneously combined with the lattice oxygen atom of the BiOI(110)surface to form nitrogen dioxide(NO_(2)).These findings can provide a novel strategy to tune exposed oxygen-rich facets by constructing 2D/2D photocatalysts for ensuring efficient photocatalytic oxidation performance.
作者
郑倩
曹玥晗
黄南建
张瑞阳
周莹
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)
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
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。
关键词
碘氧铋
氮化硼
光催化氧化反应
富氧晶面
晶格氧
Bismuth oxyiodide
Boron nitride
Photocatalytic oxidation reaction
Oxygen-rich surface
Lattice oxygen
作者简介
contributed equally:郑倩;contributed equally:曹玥晗;Corresponding author:周莹,Email:yzhou@swpu.edu.cn,Tel.:+86-28-83037401。
