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BiOI/BiOBr0.9I0.1光催化剂的制备及其对2,4-二氯苯氧乙酸的降解性能

余关龙 王世涛 杨凯 孙琪芳 阳艺

余关龙, 王世涛, 杨凯, 等. BiOI/BiOBr0.9I0.1光催化剂的制备及其对2,4-二氯苯氧乙酸的降解性能[J]. 复合材料学报, 2022, 40(0): 1-11
引用本文: 余关龙, 王世涛, 杨凯, 等. BiOI/BiOBr0.9I0.1光催化剂的制备及其对2,4-二氯苯氧乙酸的降解性能[J]. 复合材料学报, 2022, 40(0): 1-11
Guanlong YU, Shitao WANG, Kai YANG, Qifang SUN, Yi YANG. Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid[J]. Acta Materiae Compositae Sinica.
Citation: Guanlong YU, Shitao WANG, Kai YANG, Qifang SUN, Yi YANG. Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid[J]. Acta Materiae Compositae Sinica.

BiOI/BiOBr0.9I0.1光催化剂的制备及其对2,4-二氯苯氧乙酸的降解性能

基金项目: 长沙理工大学专业学位研究生“实践创新与创业能力提升计划”项目(SJCX202038);湖南省自然科学基金(2021JJ30728);湖南省生态环境厅科研项目(HBKT-2021012);湖南省教育厅重点项目(19A032)
详细信息
    通讯作者:

    余关龙,博士,副教授,硕士生导师,研究方向为光催化材料及污水处理  E-mail: ygl079@csust.edu.cn

  • 中图分类号: TB331

Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid

  • 摘要: 农药污染严重危害生态环境和饮用水安全。采用溶剂热法制备一种新型高效的BiOI/BiOBr0.9I0.1光催化剂。通过XRD、SEM、XPS、UV-vis DRS、PL、EIS等手段表征其结构、形貌和光学性能等理化性质。制备的BiOI/BiOBr0.9I0.1呈团簇状堆积结构,有助于活性位点的增加,固溶体和异质结两种策略的结合拓宽了BiOBr的光响应范围,有效防止光生电子-空穴对在BiOI/BiOBr0.9I0.1内部复合并提高产生光生载流子的氧化还原能力。光催化实验结果表明,合成的15wt%BiOI/BiOBr0.9I0.1在可见光下对2,4-二氯苯氧乙酸(2,4-D)有最佳的光催化性能,120 min降解2,4-D效率最高可达95%,4次循环实验后降解率仍达到80.9%。结合捕获实验与ESR技术结果可以证实•O2和h+是主要的活性物种。制备的BiOBr0.9I0.1能有效调节BiOBr能带结构。BiOBr0.9I0.1和BiOI构成的异质结符合Z型异质结特点,构建异质结和固溶体两策略之间可在增强BiOBr光催化活性上产生协同作用。

     

  • 图  1  BiOBr、BiOI、BiOBr0.9I0.1和15wt%BiOI/BiOBr0.9I0.1的XRD图谱:(a) 10°~80°;(b) 26°~36°

    Figure  1.  XRD patterns of BiOBr, BiOI, BiOBr0.9I0.1 and 15wt%BiOI/BiOBr0.9I0.1: (a) 10°-80°; (b) 26°-36°

    图  2  BiOBr (a)、BiOI (b)、BiOBr0.9I0.1 (c)和15wt%BiOI/BiOBr0.9I0.1 (d)的SEM图;15wt%BiOI/BiOBr0.9I0.1的EDS图(e)

    Figure  2.  SEM image of BiOBr (a), BiOI (b) , BiOBr0.9I0.1 (c) and 15wt%BiOI/BiOBr0.9I0.1 (d) ; EDS diagram of 15wt%BiOI/BiOBr0.9I0.1 (e)

    图  3  BiOBr、BiOI、BiOBr0.9I0.1、15wt%BiOI/BiOBr0.9I0.1的XPS图:(a)全谱;(b)Bi4f;(c) Br3d;(d) I3d;(e)O1s;(f)VB-XPS

    Figure  3.  XPS spectra of BiOBr, BiOI, BiOBr0.9I0.1 and 15wt%BiOI/BiOBr0.9I0.1: (a) survey; (b)Bi4f; (c) Br3d; (d) I3d; (e) O1s; (f)VB-XPS

    图  4  BiOBr、BiOI、BiOBr0.9I0.1和15wt%BiOI/BiOBr0.9I0.1的UV-Vis DRS图(a)和带隙图(b)

    Figure  4.  UV-Vis diffuse reflectance spectrum (a) and band gap diagram (b) of BiOBr, BiOI, BiOBr0.9I0.1 and 15wt%BiOI/BiOBr0.9I0.1

    图  5  BiOBr、BiOBr0.9I0.1和15wt%BiOI/BiOBr0.9I0.1的PL光谱

    Figure  5.  PL spectrum of BiOBr, BiOBr0.9I0.1 and 15wt%BiOI/BiOBr0.9I0.1

    图  6  BiOBr、BiOI、BiOBr0.9I0.1和15wt%BiOI/BiOBr0.9I0.1的EIS交流阻抗谱

    Figure  6.  EIS Nyquist plots of BiOBr, BiOI, BiOBr0.9I0.1 and 15wt%BiOI/BiOBr0.9I0.1

    图  7  BiOBr、BiOI、BiOBrxI1-x和Pwt%BiOI/BiOBr0.9I0.1可见光降解2,4-D曲线(a) (b)及对应样品准一级动力学拟合(c) (d)

    Figure  7.  Visible light degradation curves of 2,4-D by BiOBr, BiOI, BiOBrxI1-x and Pwt%BiOI/BiOBr0.9I0.1 (a) (b), quasi-first-order kinetic fitting of corresponding samples(c) (d)

    Ct—Concentration of 2,4-D at different times; C0—Initial concentration of 2,4-D

    图  8  15wt%BiOI/BiOBr0.9I0.1循环四次光催化降解图(a);循环前后15wt%BiOI/BiOBr0.9I0.1样品的XRD图(b)

    Figure  8.  Photocatalytic degradation after 4 cycles of 15wt%BiOI/BiOBr0.9I0.1 (a); XRD pattern of the 15wt%BiOI/BiOBr0.9I0.1 before and after the cycling experiment(b)

    图  10  15wt%BiOI/BiOBr0.9I0.1样品DMPO-•O2-(a) 和TEMPO-h+ (b) 的ESR光谱

    Figure  10.  ESR spectra of DMPO-•O2- (a) and TEMPO-h+ (b) in 15wt%BiOI/BiOBr0.9I0.1 samples

    图  9  添加不同捕获剂对15wt%BiOI/BiOBr0.9I0.1光催化效果的影响

    Figure  9.  Effect of adding different capture agents on the photocatalytic effect of 15wt%BiOI/BiOBr0.9I0.1

    图  11  15wt%BiOI/BiOBr0.9I0.1光催化机制示意图

    Figure  11.  Schematic diagram of the photocatalytic mechanism of 15wt%BiOI/BiOBr0.9I0.1

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  • 收稿日期:  2021-12-09
  • 录用日期:  2022-01-22
  • 修回日期:  2022-01-14
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