超声沉淀法制备Ti<sub>3</sub>C<sub>2</sub>/BiOI复合材料及其可见光催化性能

陈丹丹; 李燕; 王爱国; 詹璇

doi:10.13801/j.cnki.fhclxb.20211101.003

超声沉淀法制备Ti₃C₂/BiOI复合材料及其可见光催化性能

doi: 10.13801/j.cnki.fhclxb.20211101.003

安徽建筑大学　先进建筑材料安徽省重点实验室，合肥 230601

基金项目: 安徽省高校自然科学基金重点项目 (KJ2020A0476)；安徽省重点研究与开发计划项目(202004b11020033)

详细信息

通讯作者:
李燕，博士，教授，硕士生导师，研究方向为无机功能材料　E-mail：lyc171805@163.com

中图分类号: O643.3
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出版历程
- 收稿日期: 2021-08-26
- 修回日期: 2021-10-17
- 录用日期: 2021-10-23
- 网络出版日期: 2021-11-03
- 刊出日期: 2022-08-22

Preparation of Ti₃C₂/BiOI composite material by precipitation under ultrasonic radiation and its photocatalytic properties under visible light

Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230601, China

摘要

摘要: 为提高BiOI在可见光下的光催化性能，采用氟化氢铵蚀刻碳钛化铝得到氧封端的Ti₃C₂，以五水合硝酸铋为铋源，碘化钾为碘源，利用超声沉淀法合成Ti₃C₂/BiOI复合材料。通过XRD、SEM、UV-vis、FTIR、EIS、I-t、PL等手段对材料的组成、形貌、结构、光吸收、电化学阻抗、瞬态光电流响应、光谱响应等方面进行表征和测试。以甲基橙(MO)为目标污染物，模拟可见光照射下研究Ti₃C₂/BiOI复合材料的光催化性能。结果表明：BiOI成功负载到Ti₃C₂上，在模拟太阳光照射下，Ti₃C₂/BiOI复合材料表现出较高的光催化降解能力。其中Ti₃C₂质量分数为6wt%的Ti₃C₂/BiOI复合粉的光催化效率最高，在光照0.5 h后降解率达到91.6%，较纯BiOI提高4.5倍。氧封端的Ti₃C₂作为助催化剂及时转移光生电子，在电荷耗尽层保持了电荷分离，极大提高了光催化性能。
- 超声沉淀法 /
- Ti₃C₂ /
- BiOI /
- 复合材料 /
- 光催化降解
Abstract: In order to improve the photocatalytic performance of BiOI under visible light, the O-terminated Ti₃C₂ was prepared by etching Ti₃AlC₂ with NH₄HF₂, Ti₃C₂/BiOI composite materials were prepared by precipitation under ultrasonic radiation, using bismuth nitrate pentahydrate as bismuth source, potassium iodide as iodine source. The composition, morphology, structure, light absorption, transient photocurrent response and spectral response of Ti₃C₂/BiOI composite materials were characterized and measured by XRD, SEM, UV-vis, FTIR, EIS, I-t and PL. The photocatalytic degradation property of Ti₃C₂/BiOI composite material was carried out using methyl orange (MO) as targeted pollutant under simulated visible light. The results show that BiOI is successfully loaded on Ti₃C₂, the Ti₃C₂/BiOI composite material exhibits an appreciable photocatalytic activity under simulated visible light. The 6wt%Ti₃C₂/BiOI composite material shows the highest efficiency of 91.6% within 0.5 h, which is nearly 4.5 times higher than that of the BiOI. The O-terminated Ti₃C₂ as a cocatalyst to transfer photogenerated electrons in time, the charge separation is maintained in the charge depletion layer, which is helpful to improve the photocatalytic activity.
- precipitation under ultrasonic radiation /
- Ti₃C₂ /
- BiOI /
- composite material /
- photocatalytic reduction

HTML全文

图 1 Ti₃C₂和Ti₃AlC₂的XRD图谱

Figure 1. XRD patterns of Ti₃AlC₂ and Ti₃C₂

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图 2 Ti₃C₂、BiOI及不同质量分数Ti₃C₂的Ti₃C₂/BiOI复合材料的XRD图谱

Figure 2. XRD patterns of Ti₃C₂, BiOI and Ti₃C₂/BiOI composites with different mass fractions of Ti₃C₂

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图 3 Ti₃C₂ (a)、BiOI (b) 及6wt%Ti₃C₂ /BiOI复合材料 (c) 的SEM图像

Figure 3. SEM images of Ti₃C₂ (a), BiOI (b) and 6wt%Ti₃C₂/BiOI composite (c)

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图 4 超声沉淀法制备Ti₃C₂/BiOI复合材料机制图

Figure 4. Mechanism diagram of preparation of Ti₃C₂/BiOI composite material by precipitation under ultrasonic radiation

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图 5 Ti₃C₂、BiOI及不同质量分数Ti₃C₂的Ti₃C₂/BiOI复合材料模拟可见光降解甲基橙(MO)曲线

Figure 5. Simulated visible light degradation curves of methyl orange (MO) by Ti₃C₂, BiOI and Ti₃C₂/BiOI composites with different mass fractions of Ti₃C₂

C_t—Pollutant concentration at the moment of t; C₀—Original pollutant concentration

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图 6 Ti₃C₂、BiOI及不同质量分数Ti₃C₂的Ti₃C₂/BiOI复合材料的光吸收边

Figure 6. Light absorption edge of Ti₃C₂, BiOI and Ti₃C₂/BiOI composites with different mass fractions of Ti₃C₂

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图 7 BiOI和6wt%Ti₃C₂/BiOI复合材料的能隙图

Figure 7. Energy gap of BiOI and 6wt%Ti₃C₂/BiOI composite

E_g—Energy gap; α—Absorption coefficient; h—Planck parameter; v—Light frequency

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图 8 Ti₃C₂、BiOI及6wt%Ti₃C₂/BiOI复合材料的FTIR图谱

Figure 8. FTIR spectra of Ti₃C₂, BiOI and 6wt%Ti₃C₂/BiOI composite

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图 9 BiOI和6wt%Ti₃C₂/BiOI复合材料的电化学阻抗及波特图

Figure 9. Electrochemical impedance spectroscopy (EIS) Nyquist and Bode polt of BiOI and 6wt%Ti₃C₂/BiOI composite

R_s—Internal resistance of electrolyte solution; R_p—Charge transfer resistance of the working electrode; CPE—Capacitance of a constant phase element

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图 10 BiOI及6wt%Ti₃C₂/BiOI复合材料的瞬态光电流响应图

Figure 10. Transient photocurrent response imagine of BiOI and 6wt%Ti₃C₂/BiOI composite

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图 11 BiOI与6wt%Ti₃C₂/BiOI复合材料的光致发光(PL)图谱

Figure 11. Photoluminescence (PL) spectrum of BiOI and 6wt%Ti₃C₂/BiOI composite

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图 12 不同捕获剂对6wt%Ti₃C₂/BiOI复合材料光催化活性的影响

Figure 12. Effect of different capture agents on the photocatalytic activity of 6wt%Ti₃C₂/BiOI composite

IPA—Isopropyl alcohol; p-BQ—p-Benzoquinone; EDTA—Ethylene diamine tetraacetic acid

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图 13 Ti₃C₂/BiOI复合材料光致电荷转移机制图

Figure 13. Mechanism of charge transfer processes of the Ti₃C₂/BiOI composite

CB—Conduction band; VB—Valence band; E_f—Fermi level

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