催化学报 ›› 2022, Vol. 43 ›› Issue (4): 1111-1122.DOI: 10.1016/S1872-2067(21)63930-X

• 论文 • 上一篇    下一篇

盐酸介导策略合成的具有优异光催化能力的ZnFe2O4小颗粒点缀一维苝二酰亚胺S型异质结

徐阳锐a, 朱晓蝶a, 颜欢a, 王盼盼a, 宋旼珊b, 马长畅c, 陈自然g, 储金宇a, 刘馨琳d,e,*(), 逯子扬a,f,h,*()   

  1. a江苏大学环境与安全工程学院, 环境健康与生态安全研究院, 江苏镇江212013, 中国
    b江苏科技大学理学院, 江苏镇江212003, 中国
    c东京大学化学系, 首尔04620, 韩国
    d江苏大学能源与动力工程学院, 江苏镇江212013, 中国
    e美国波特兰州立大学机械与材料工程系, 波特兰, 美国
    f美国田纳西州大学化学系, 诺克斯维尔37996, 美国
    g四川职业技术学院建筑与环境工程系, 四川遂宁629000, 中国
    h苏州科技大学江苏水处理技术与材料协同创新中心, 江苏苏州215009, 中国
  • 收稿日期:2021-07-18 接受日期:2021-07-18 出版日期:2022-03-05 发布日期:2022-03-01
  • 通讯作者: 刘馨琳,逯子扬
  • 基金资助:
    国家自然科学基金(21908080);江苏省自然科学基金(BK20180884);镇江市重点研发计划-社会发展项目(SH2018021);江苏省政府海外留学基金项目(JS-2018-243);江苏省政府海外留学基金项目(JS-2018-241);江苏水处理技术与材料协同创新中心

Hydrochloric acid-mediated synthesis of ZnFe2O4 small particle decorated one-dimensional Perylene Diimide S-scheme heterojunction with excellent photocatalytic ability

Yangrui Xua, Xiaodie Zhua, Huan Yana, Panpan Wanga, Minshan Songb, Changchang Mac, Ziran Cheng, Jinyu Chua, Xinlin Liud,e,*(), Ziyang Lua,f,h,*()   

  1. aInstitute of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
    bSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
    cDepartment of Chemistry, Dongguk University, Seoul 04620, South Korea
    dSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
    eDepartment of Mechanical & Materials Engineering, Portland State University, Portland, OR, USA
    fDepartment of Chemistry, University of Tennessee, Tennessee, Knoxville 37996, USA
    gDepartment of Architecture and Environment Engineering, Sichuan Vocational and Technical College, Suining 629000, Sichuan, China
    hJiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China
  • Received:2021-07-18 Accepted:2021-07-18 Online:2022-03-05 Published:2022-03-01
  • Contact: Xinlin Liu, Ziyang Lu
  • Supported by:
    National Natural Science Foundation of China(21908080);Natural Science Foundation of Jiangsu Province(BK20180884);Zhenjiang Key Research & Development Project(SH2018021);Jiangsu Government Scholarship for Overseas Studies(JS-2018-243);Jiangsu Government Scholarship for Overseas Studies(JS-2018-241);Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment

摘要:

由于有机材料的结构多样性, 越来越多的研究者选择有机材料作为光催化剂. 典型的n型有机半导体苝二酰亚胺(PDI)不仅在可见光照射下有较强的光响应能力, 而且有合适的带隙和负导带, 使得光激发电子具有较强的还原能力. 半导体光催化剂的适用性受到光生载流子复合的限制, 而构建S型异质结可有效保证电荷分离, 也可保证空穴和电子的强氧化能力和强还原能力. 此外, 由于普通光催化剂分离回收困难, 可以将PDI与磁性半导体ZnFe2O4相结合来构建复合光催化剂, 该复合光催化剂可以通过外加磁场进行回收以降低成本, 在提高复合光催化剂性能的基础上保证回收率, 并且具有较好的光化学稳定性. 然而, 不同方法制得不同粒径和形貌的PDI或ZnFe2O4的光催化性能也不同. 因此控制PDI和ZnFe2O4的形貌对增强光催化活性起着至关重要的作用. 本文采用盐酸-介导策略制备了ZnFe2O4小颗粒点缀的一维PDI的S型异质结(1D PDI/ZnFe2O4). 实验发现, 用盐酸介导策略调控二者的形貌可以使其具有更好的光催化能力. 采用透射电镜(TEM)、X射线衍射、X射线光电子能谱等对1D PDI/ZnFe2O4进行表征, 通过光降解四环素溶液评价1D PDI/ZnFe2O4的光催化能力和稳定性, 并利用DFT理论计算和ESR方法等对1D PDI/ZnFe2O4的光催化机理进行深入的探讨.
扫描电子显微镜和TEM结果表明, 盐酸介导可有效调控1D PDI/ZnFe2O4的形貌, 经过盐酸介导, PDI变成均匀的棒状结构, ZnFe2O4变成均匀的小颗粒, 并点缀在PDI上; 而未引入盐酸的PDI仍呈不规则块状, 其ZnFe2O4仍为小颗粒团聚的大球状结构. XPS结合能的偏移及DFT理论计算结果表明, 材料间形成了内部电场. 当PDI和ZnFe2O4接触时, 为了使PDI和ZnFe2O4的费米能级相同, PDI中的e通过界面转移到ZnFe2O4中, 导致界面处产生了内部电场. 同时, 由于e的流失, PDI的带边向上弯曲, 而ZnFe2O4的带边向下弯曲. 在光照射下, PDI和ZnFe2O4的e从VB激发到CB. 内电场、带边弯曲和库仑相互作用加速了PDI CB上e和ZnFe2O4 VB上h+的复合, 也抑制了PDI CB上e和VB上h+的复合. 综上, 1D PDI/ZnFe2O4的电子传递机理与S型异质结光催化反应机理一致. 光催化剂催化四环素溶液降解性能结果表明, 1D PDI/ZnFe2O4催化四环素溶液的降解率分别是PDI和ZnFe2O4的9.18倍和9.73倍. 说明通过盐酸介导策略可以有效地调控1D PDI/ZnFe2O4的形貌, 使其具有良好的光催化性能和回收再利用性. 本文为磁性有机-无机S型异质结光催化剂的组装提供了新思路.

关键词: 盐酸介导策略, 形貌调控, PDI/ZnFe2O4, S型异质结, 光催化能力

Abstract:

The recyclable and stable ZnFe2O4 small particle decorated one-dimensional perylene diimide (PDI) S-scheme heterojunction (1D PDI/ZnFe2O4) is prepared by the hydrochloric acid-mediated (HCl-mediated) strategy, interestingly, the morphology of the 1D PDI/ZnFe2O4 can also be effectively regulated by HCl-mediated process, the existence of HCl can regulate PDI into a uniform rod structure, while the co-existence of HCl and PDI can limit ZnFe2O4 to become the uniform small particles. More importantly, based on the 1D rod structure of PDI and the small size effect of ZnFe2O4, carriers can migrate to the surface more easily, which can improve the photocatalytic activity. Meanwhile, due to the appropriate energy level structure, the S-scheme heterojunction structure is formed between PDI and ZnFe2O4, which eliminates meaningless photo-generated charge carriers through recombination and introduces strong redox to further enhance the photodegradation effect, thereby, 1D PDI/ZnFe2O4 exhibits excellent photocatalytic ability, under the visible light irradiation, the degradation rate of tetracycline (TC) with 1D PDI/ZnFe2O4 (66.67%) is 9.18 times that with PDI (7.26%) and 9.73 times that with ZnFe2O4 (6.85%). This work proposes new ideas for the assembly of magnetic organic-inorganic S-scheme heterojunction photocatalysts.

Key words: Hydrochloric acid-mediated strategy, Morphology regulation, Perylene diimide/ZnFe2O4, S-scheme heterojunction, Photocatalytic ability