带状γ-Fe<sub>2</sub>O<sub>3</sub>/ZnO异质结光催化剂光催化降解四环素

罗灵芝; 俞俊; 罗豪; 吴慧; 肖禾; 陈礼辉; 黄六莲

doi:10.13801/j.cnki.fhclxb.20200826.001

带状γ-Fe₂O₃/ZnO异质结光催化剂光催化降解四环素

doi: 10.13801/j.cnki.fhclxb.20200826.001

罗灵芝^{1, 4},
俞俊^{1, 2},
罗豪^{1, 2},
吴慧^{1, 2},
肖禾^{1, 2, 3, ,},
陈礼辉^{1, 2},
黄六莲^{1, 2}

1.
福建农林大学　材料工程学院，福州 350108
2.
福建农林大学　植物纤维功能材料国家林业与草原局重点实验室，福州 350108
3.
山东华泰集团，东营 257335
4.
宁夏工商职业技术学院，银川 750021

基金项目: “十三五”国家重点研发计划(2017YFD601005)；国家自然科学基金(31700519)；中国博士后科学基金资助项目(2020T130215)

详细信息

通讯作者:
肖禾，博士，讲师，硕士生导师，研究方向为光催化环境和能源材料　E-mail：xiaohe_river@163.com

中图分类号: O643.36
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-18
- 录用日期: 2020-08-10
- 网络出版日期: 2020-08-26
- 刊出日期: 2021-05-01

Photocatalytic degradation of tetracycline by band-like γ-Fe₂O₃/ZnO heterojunction photocatalyst

LUO Lingzhi^{1, 4},
YU Jun^{1, 2},
LUO Hao^{1, 2},
WU Hui^{1, 2},
XIAO He^{1, 2, 3
, ,},
CHEN Lihui^{1, 2},
HUANG Liulian^{1, 2}

1.
College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China
2.
National Forestry & Grassland Bureau Key Laboratory of Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou 350108, China
3.
Shandong HuaTai Group, Dongying 257335, China
4.
Ningxia Vocational Technical College of Industry and Commerce, Yinchuan 750021, China

摘要

摘要: 针对传统ZnO光催化活性不高的问题，采用Zn(CH₃COO)₂和FeCl₃作为ZnO和Fe₂O₃的前驱体，水热条件下采用“一锅法”制备带状γ-Fe₂O₃/ZnO异质结光催化剂，采用XRD、BET比表面积测量仪、TEM、紫外-可见漫反射、电子顺磁共振(EPR)等对其晶体化学结构进行表征。在可见光光源下，探究了不同γ-Fe₂O₃负载量时γ-Fe₂O₃/ZnO异质结光催化剂对四环素的光催化降解的效果。研究表明，ZnO负载γ-Fe₂O₃后比表面积和光照吸收显著改善，禁带宽度有所减小，可见光光照120 min，n(Zn)∶n(Fe) (原子比)为20∶1的γ-Fe₂O₃/ZnO异质结光催化剂对四环素的降解率高达97.2%，多次重复使用后四环素的降解率保持在95%以上。
- ZnO /
- Fe₂O₃ /
- 异质结 /
- 光降解 /
- 四环素
Abstract: In order to solve the problem of poor photocatalytic activity of traditional ZnO, band-like γ-Fe₂O₃/ZnO heterojunction photocatalyst was prepared by an one-pot method under hydrothermal conditions using Zn(CH₃COO)₂ and FeCl₃ as precursors in this paper. The chemical structure of as-prepared γ-Fe₂O₃/ZnO heterojunction photocatalyst was characterized by XRD, BET specific surface area tester, TEM, UV-Vis diffuse reflection and electron paramagnetic resonance (EPR). The tetracycline photodegradation by the γ-Fe₂O₃/ZnO heterojunction photocatalyst with different loading of γ-Fe₂O₃ was explored under visible light. The results show that due to γ-Fe₂O₃ loading onto the ZnO, the specific surface area and light absorption significantly increase, while the band gap reduces. After visible light illumination about 120 minutes, the photodegradation ratio of tetracycline is up to 97.2% by γ-Fe₂O₃/ZnO heterojunction photocatalyst when n(Zn)∶n(Fe) (atomic ratio) is 20∶1, and the tetracycline photodegradation ratio remains above 95% after repeated use.
- ZnO /
- Fe₂O₃ /
- heterostructure /
- photodegradation /
- tetracycline

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图 1 ZnO和γ-Fe₂O₃/ZnO异质结光催化剂的XRD图谱

Figure 1. XRD patterns of ZnO and γ-Fe₂O₃/ZnO heterojunction photocatalysts

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图 2 ZnO和γ-Fe₂O₃/ZnO异质结光催化剂的TEM图像 ((a)~(d)) 及γ-Fe₂O₃/ZnO-2异质结光催化剂的TEM元素图像 (e)

Figure 2. TEM images of ZnO and γ-Fe₂O₃/ZnO heterojunction photocatalysts ((a)~(d)) and TEM element mapping of γ-Fe₂O₃/ZnO-2 heterojunction photocatalyst (e)

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图 3 ZnO和γ-Fe₂O₃/ZnO异质结光催化剂的N₂吸附-脱附等温曲线(a)和孔径分布(b)

Figure 3. N₂ adsorption-desorption isotherms (a) and pore size distribution (b) of ZnO and γ-Fe₂O₃/ZnO heterojunction photocatalysts

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图 4 ZnO和γ-Fe₂O₃/ZnO异质结光催化剂的紫外-可见漫反射图谱

Figure 4. UV-Vis diffuse reflection spectra of ZnO and γ-Fe₂O₃/ZnO heterojunction photocatalysts

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图 5 ZnO和γ-Fe₂O₃/ZnO异质结光催化剂的暗吸附和光催化降解四环素过程

Figure 5. Dark adsorption and photocatalytic process of tetracycline by ZnO and γ-Fe₂O₃/ZnO heterojunction photocatalysts

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图 6 γ-Fe₂O₃/ZnO-3异质结光催化剂的光降解四环素重复使用性

Figure 6. Photocatalytic reusability of tetracycline by γ-Fe₂O₃/ZnO-3 heterojunction photocatalyst

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图 7 ZnO和γ-Fe₂O₃/ZnO-3异质结光催化剂光催化时的光生氢氧自由基和超氧自由基

Figure 7. Photo-generated hydroxyl radicals and superoxide radicals of ZnO and γ-Fe₂O₃/ZnO-3 heterojunction photocatalyst in process of photocatalysis

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图 8 γ-Fe₂O₃/ZnO异质结光催化剂光催化降解四环素的机制示意图

Figure 8. Mechanism schematic of photocatalytic degradation of tetracycline by γ-Fe₂O₃/ZnO heterojunction photocatalysts

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