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g-C3N4/BiOCl复合光催化剂作为2D/2D异质结用于光催化降解染料性能研究

吴健博 石亮 郑小强 张明剑 陈丽娟

吴健博, 石亮, 郑小强, 等. g-C3N4/BiOCl复合光催化剂作为2D/2D异质结用于光催化降解染料性能研究[J]. 复合材料学报, 2022, 40(0): 1-11
引用本文: 吴健博, 石亮, 郑小强, 等. g-C3N4/BiOCl复合光催化剂作为2D/2D异质结用于光催化降解染料性能研究[J]. 复合材料学报, 2022, 40(0): 1-11
Jianbo WU, Liang SHI, Xiaoqiang ZHENG, Mingjian ZHANG, Lijuan CHEN. g-C3N4/BiOCl composite photocatalyst was used as 2D/2D heterojunction for photocatalytic degradation of dyes[J]. Acta Materiae Compositae Sinica.
Citation: Jianbo WU, Liang SHI, Xiaoqiang ZHENG, Mingjian ZHANG, Lijuan CHEN. g-C3N4/BiOCl composite photocatalyst was used as 2D/2D heterojunction for photocatalytic degradation of dyes[J]. Acta Materiae Compositae Sinica.

g-C3N4/BiOCl复合光催化剂作为2D/2D异质结用于光催化降解染料性能研究

基金项目: 国家自然科学基金 (21406058);湖南省自然科学基金(2021JJ30237)
详细信息
    通讯作者:

    陈丽娟,博士,教授,硕士生导师,研究方向为光催化、多相催化 E-mail: ljchen11@163.com

  • 中图分类号: G305

g-C3N4/BiOCl composite photocatalyst was used as 2D/2D heterojunction for photocatalytic degradation of dyes

  • 摘要: 为扩大BiOCl的太阳光吸收范围,获得更高效的光催化剂,本文通过水热法制备了g-C3N4/BiOCl(2D/2D)复合光催化剂并对其进行详细表征。结构与形貌表征结果显示BiOCl纳米片沉积在层状g-C3N4表面,形成了2D/2D面-面复合结构,光电化学性质分析表明形成的异质结构能有效扩展光吸收频率范围,促进光生载流子分离和迁移,从而有利于光催化性能的提高。以500 W氙灯模拟太阳光源,光催化降解RhB的结果表明g-C3N4/BiOCl异质结的光催化降解活性远高于单纯的g-C3N4和BiOCl。其中9wt%g-C3N/BiOCl表现出了最为优越的光催化活性,在180 min内对RhB的降解率为94%,其kapp值为g-C3N4和BiOCl的5.7和3.6倍。同时对g-C3N4/BiOCl异质结的光催化机制展开研究,结合复合催化剂电子结构和自由基捕获实验提出了在染料敏化作用下RhB的光催化降解机制。

     

  • 图  1  g-C3N4、BiOCl及g-C3N4/BiOCl异质结的XRD图

    Figure  1.  XRD patterns of g-C3N4, BiOCl and g-C3N4/BiOCl heterojunction

    图  2  (a) g-C3N4、BiOCl和9wt%g-C3N4/BiOCl的XPS全谱;(b)、(c)、(d) 分别为BiOCl和9wt%g-C3N4/BiOCl的Bi 4f, O 1s, Cl 2p高分辨XPS光谱;(e), (f) 为g-C3N4和9wt%g-C3N4/BiOCl的C 1s、N 1s高分辨XPS光谱

    Figure  2.  (a) XPS survey spectra of g-C3N4, BiOCl and 9wt%g-C3N4/BiOCl; (b), (c) and (d) are Bi 4f, O 1s and Cl 2p high-resolution XPS spectra of BiOCl and 9wt%g-C3N4/BiOCl, respectively; (e), (f) C 1S, N 1s high-resolution XPS spectra of g-C3N4 and 9wt%g-C3N4/BiOCl

    图  3  (a)、(b)为BiOCl的SEM、TEM图,(c)、(e)为g-C3N4的SEM、TEM图,(d)、(f)为9wt%g-C3N4/BiOCl的TEM图

    Figure  3.  (a) and (b) are SEM and TEM images of BiOCl, (c) and (e) are SEM and TEM images of g-C3N4, and (d) and (f) are TEM images of 9wt%g-C3N4/BiOCl

    图  4  g-C3N4、BiOCl以及9wt%g-C3N4/BiOCl的N2吸附-脱附等温线(插图为g-C3N4、BiOCl以及9wt%g-C3N4/BiOCl的孔径分布曲线)

    Figure  4.  N2 adsorption-desorption isotherms of g-C3N4, BiOCl and 9wt%g-C3N4/BiOCl (illustrated with aperture distribution curves of g-C3N4, BiOCl and 9wt%g-C3N4/BiOCl)

    图  5  g-C3N4、BiOCl和g-C3N4/BiOCl异质结的紫外-可见漫反射光谱(a)和能隙图(b)

    Figure  5.  UV-Visible diffuse reflectance spectra of g-C3N4, BiOCl and g-C3N4/BiOCl heterojunction (a) and energy gap diagram (b)

    图  6  g-C3N4、BiOCl和g-C3N4/BiOCl 异质结的PL光谱

    Figure  6.  PL spectra of g-C3N4, BiOCl and g-C3N4/BiOCl heterojunction

    图  7  g-C3N4、BiOCl、9wt%g-C3N4/BiOCl的电化学阻抗谱(a)以及瞬态光电流响应图(b)

    Figure  7.  Electrochemical impedance spectra of g-C3N4, BiOCl and 9wt%g-C3N4/BiOCl (a) and transient photocurrent response diagram (b)

    图  8  (a)g-C3N4、BiOCl以及g-C3N4/BiOCl异质结对RhB的降解率;(b)g-C3N4、BiOCl以及g-C3N4/BiOCl异质结对 RhB的降解反应动力学图

    Figure  8.  (a) Degradation rate of RhB by g-C3N4, BiOCl and g-C3N4/BiOCl heterojunction; (b) Kinetics of RhB degradation over g-C3N4, BiOCl and g-C3N4/BiOCl heterojunction

    C/C0—Ratio of the concentration of the organic pollutant solution after a certain period of time to the concentration of the organic pollutant solution before the photocatalytic reaction; Kapp—Apparent rate constant of photocatalyst degradation of organic pollutants

    图  9  (a)9wt%g-C3N4/BiOCl对RhB的降解吸收光谱、(b)500 W氙灯照射下,9wt%g-C3N4/BiOCl催化降解RhB的循环试验

    Figure  9.  (a) Degradation absorption spectrum of RhB by 9wt%g-C3N4/BiOCl, and (b) cyclic degradation of RhB by 9wt%g-C3N4/BiOCl under 500 W xenon lamp

    图  10  9wt%g-C3N4/BiOCl在模拟太阳光照射下的活性物种捕获实验

    Figure  10.  Active species capture experiment of 9wt%g-C3N4/BiOCl under simulated sunlight

    IPA—Isopropyl alcohol; P-BQ—1,4-Benzoquinone; AgNO3—Silver nitrate; EDTA-2Na—Ethylenediaminetetraacetic acid disodium salt

    图  11  g-C3N4(a)和BiOCl(b)的Mott-Schottky曲线

    Figure  11.  Mott-Schottky curves of g-C3N4 (a) and BiOCl(b)

    1/C2—Reciprocal of interface capacitance squared

    图  12  9wt%g-C3N4/BiOCl 光催化降解RhB的催化机制

    Figure  12.  Catalytic mechanism of 9wt%g-C3N4/BiOCl photocatalytic degradation of RhB

    CB—Conduction band; VB—Valence band; RhB—Rhodamine B.

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  • 收稿日期:  2021-12-17
  • 录用日期:  2022-01-22
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