TiO2-g-C3N4-Bi2O3复合异质结构催化材料在水处理中的应用

谢若兰; 何欢; 杨世利; 刘权锋; 王艺蒸; 余江

doi:10.13801/j.cnki.fhclxb.20201130.002

TiO₂-g-C₃N₄-Bi₂O₃复合异质结构催化材料在水处理中的应用

doi: 10.13801/j.cnki.fhclxb.20201130.002

谢若兰^{1, 3,},
何欢^{1, 3,},
杨世利^{1, 3,},
刘权锋^{1, 3,},
王艺蒸^{1, 3,},
余江^{1, 2, 3, ,}

1.
四川大学　建筑与环境学院，成都 610065
2.
四川大学　宜宾产业技术研究院，宜宾 644000
3.
四川大学　新能源与低碳技术研究院，成都 610065

基金项目: 国家重点研发计划项目(2018YFC1802605)；四川省科技重点攻关项目(2017GZ0383)；四川大学-宜宾市校市战略合作专项(2019CDYB-26)

详细信息

通讯作者:
余江，博士，教授，硕士生导师，研究方向为环境功能材料研究　E-mail：yuj@scu.edu.cn

中图分类号: X53
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-14
- 录用日期: 2020-11-25
- 网络出版日期: 2020-12-01
- 刊出日期: 2021-09-01

Application of TiO₂-g-C₃N₄-Bi₂O₃ composite heterogeneous catalytic materials in water treatment

XIE Ruolan^{1, 3
,},
HE Huan^{1, 3
,},
YANG Shili^{1, 3
,},
LIU Quanfeng^{1, 3
,},
WANG Yizheng^{1, 3
,},
YU Jiang^{1, 2, 3
, ,}

1.
College of Architecture and Environment, Sichuan University, Chengdu 610065, China
2.
Yibin Institute of Industrial Technology, Sichuan University, Yibin 644000, China
3.
Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, China

摘要

摘要: 异质结光催化材料在降解有毒有害污染物方面体现出优良的效果。以苯酚有机废水作为研究对象，球磨法所制备的TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃两种光催化材料作为实验材料，探究不同光源条件下TiO₂-g-C₃N₄、TiO₂-g-C₃N₄-Bi₂O₃的光催化特性及其对苯酚废水处理效果。结果表明，在可见光和紫外光单独照射条件下，三元体系的TiO₂-g-C₃N₄-Bi₂O₃均比TiO₂-g-C₃N₄具有更高的光催化活性，并且可见光条件下，TiO₂-g-C₃N₄-Bi₂O₃比TiO₂-g-C₃N₄的优势更明显；在可见光和紫外光同时照射时，TiO₂-g-C₃N₄-Bi₂O₃、TiO₂-g-C₃N₄对苯酚废水的降解效率分别达到99.44%、96.67%。表征结果表明，Bi₂O₃的掺杂有效地增强了催化剂在全光谱范围内对光的吸收，并且三元体系的构建有效地促进了光生电子与空穴的分离。研究结果表明，通过简单可控的球磨-微波加热-煅烧工艺，可以实现TiO₂-g-C₃N₄-Bi₂O₃的制备，并且证实了TiO₂-g-C₃N₄-Bi₂O₃材料在有机废水处理方面的良好前景。
- 苯酚 /
- 有机废水 /
- 可见光 /
- 紫外光 /
- 异质结构 /
- 光催化
Abstract: Heterojunction photocatalytic materials show excellent ability in degrading toxic and harmful pollutants. In this study, we prepared TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ heterostructure photocatalytic materials by ball milling. The photocatalytic performance of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ towards phenol organic wastewater were investigated under different light source, as well as the effects of light source on the degradation performance. Under the single visible light or ultraviolet light, the ternary TiO₂-g-C₃N₄-Bi₂O₃ shows higher photocatalytic activity than TiO₂-g-C₃N₄. And under visible light conditions, the degradation performance of TiO₂-g-C₃N₄-Bi₂O₃ is much better than TiO₂-g-C₃N₄. Under the simultaneous irradiation of visible light and ultraviolet light, the degradation efficiency of TiO₂-g-C₃N₄-Bi₂O₃ and TiO₂-g-C₃N₄ on phenol wastewater reached 99.44% and 96.67%, respectively. The characterization results show that the doping of Bi₂O₃ remarkably enhances the absorption of light by the catalyst in the full spectrum, and the construction of the ternary system promotes the separation of photogenerated electrons and holes. The research results show that the ternary TiO₂-g-C₃N₄-Bi₂O₃ can be achieved through a feasible ball method of milling-microwave heating-calcination process, and confirms the promising prospects of TiO₂-g-C₃N₄-Bi₂O₃ in organic wastewater treatment.
- phenol /
- organic wastewater /
- visible light /
- ultraviolet light /
- heterojunction /
- photocatalytic

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图 1 TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃复合材料的XRD图谱

Figure 1. XRD patterns of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃

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图 2 TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃的SEM图像和TEM图像

Figure 2. SEM and TEM images of TiO₂-g-C₃N₄andTiO₂-g-C₃N₄-Bi₂O₃((a),(c) TiO₂-g-C₃N₄; (b),(d) TiO₂-g-C₃N₄-Bi₂O₃)

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图 3 TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃复合材料的吸收光谱图 (a) 和对应的Tauc’s plots曲线图 (b)

Figure 3. Absorption spectra of TiO₂-g-C₃N₄ (a) and TiO₂-g-C₃N₄-Bi₂O₃ and their corresponding Tauc's plots (b)

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图 4 可见光照射下TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃对苯酚的降解效果

Figure 4. Degradation efficiency of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ for forphenol under visible light irradiation

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图 5 紫外光照射下TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃对苯酚的降解效果

Figure 5. Degradation efficiency of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ for phenol under UV light irradiation

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图 6 可见光和紫外光同时照射下TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃对苯酚的降解效果

Figure 6. Degradation efficiency of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ for phenol under UV-vis light irradiation

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图 7 紫外光 (a) 和可见光(b)条件下TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃对苯酚的动力学曲线

Figure 7. Kinetic curves of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ for phenol under UV light (a) and under Visible light (b)

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图 8 TiO₂-g-C₃N₄-Bi₂O₃复合材料催化降解苯酚机制

Figure 8. Mechanism of catalytic degradation of wastewater by TiO₂-g-C₃N₄-Bi₂O₃ composite powder

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表 1 各样品的禁带宽度(E_g)

Table 1. Energy gap (E_g) of all samples

Sample	TiO₂	g-C₃N₄	Bi₂O₃^[19]	TiO₂-g-C₃N₄	TiO₂-g-C₃N₄-Bi₂O₃
E_g/eV	3.18	2.70	2.80	2.91	2.83

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表 2 TiO₂-g-C₃N₄和TiO₂-g-C₃N₄-Bi₂O₃对苯酚的反应动力学参数

Table 2. Reaction kinetic parameters of TiO₂-g-C₃N₄ and TiO₂-g-C₃N₄-Bi₂O₃ for phenol

Sample	K	R²
TiO₂-g-C₃N₄ (UV ligh)	0.0967±0.0042	0.9925
TiO₂-g-C₃N₄/Bi₂O₃ (UV light)	0.1189±0.0066	0.9880
TiO₂-g-C₃N₄ (visible light)	0.0449±0.0031	0.9816
TiO₂-g-C₃N₄-Bi₂O₃ (visible light)	0.0734±0.0035	0.9909
Notes: K—Slope of straight line; R²—Goodness of fit.

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表 3 各样品的能带位(E_CB)

Table 3. Conduction band edge (E_CB) of all samples

	g-C₃N₄	Bi₂O₃	TiO₂
Eg/eV	2.70	2.80	3.18
E_CB/eV	−1.12	0.33	−0.28
E_VB/eV	1.58	3.13	2.90

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