TiO<sub>2</sub>/静电纺PAN基碳复合材料的制备及光催化性能

于翔; 张雪寅; 李如洋; 赵亚浩; 卢晓龙

doi:10.13801/j.cnki.fhclxb.20200429.001

TiO₂/静电纺PAN基碳复合材料的制备及光催化性能

doi: 10.13801/j.cnki.fhclxb.20200429.001

于翔¹,
张雪寅¹,
李如洋^1,,
赵亚浩^1,,
卢晓龙^{1, 2, ,}

1.
河南工程学院　材料与化学工程学院，郑州 450007
2.
河南理工大学　材料科学与工程学院，焦作 454001

详细信息

通讯作者:
卢晓龙，硕士研究生，研究方向为高分子材料加工与改性，光催化剂改性　E-mail：lxlpolymer@sina.com

中图分类号: TB332
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出版历程
- 收稿日期: 2020-01-15
- 录用日期: 2020-03-31
- 网络出版日期: 2020-04-29
- 刊出日期: 2020-12-15

Preparation and photocatalytic properties of TiO₂/electrospinning PAN-based carbon composite material

YU Xiang¹,
ZHANG Xueyin¹,
LI Ruyang^1
,,
ZHAO Yahao^1
,,
LU Xiaolong^{1, 2
, ,}

1.
Department of Material and Chemical Engineering, Henan University of Engineering, Zhengzhou 450007, China
2.
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454001, China

摘要

摘要: 为了同时提高催化剂的光催化和回收能力，以聚丙烯腈(PAN)和钛酸四丁酯(TBT)作为碳纳米纤维(CNFs)和TiO₂前驱体，通过静电纺丝和热处理方法制备了TiO₂/CNFs复合材料，并通过SEM、XRD、Raman、UV-vis分光光度计等对TiO₂/CNFs复合材料的形貌、晶体结构、光吸收性能、导电性和光催化性能进行了研究。结果表明：随TBT添加量的逐渐增多，TiO₂/CNFs复合材料在热处理过程中卷曲形态逐渐消失，并且TBT在碳化过程中完全转化为锐钛矿TiO₂；TiO₂/CNFs复合材料光吸收边缘由纯TiO₂的紫外光区扩展至可见光区，提高了催化剂对太阳光的利用率；同时，在模拟太阳光照射180 min，TiO₂/CNFs复合材料对RhB的光催化降解率最大可达到95.71%，并且在连续重复使用5次后光催化降解效率仍可达到约90%。
- TiO₂ /
- 碳纳米纤维(CNFs) /
- 复合材料 /
- 电子-空穴对 /
- 光催化
Abstract: To enhance the photocatalysis and recycling abilities of catalyst simultaneously, polyacrylonitrile (PAN) and tetrabutyltitanate (TBT) were used as carbon-nanofibers (CNFs) and TiO₂ precursors, and TiO₂/CNFs composite materials were successfully prepared via electrospinning and heat treatment, and its morphology, crystal structure, optical performance and photocatalytic properties were studied by SEM, XRD, Raman, UV-vis Spectrophotometer and so on. The results show that the crimp shape of the composite material gradually disappears during heat treatment, and TBT is completely transformed into anatase TiO₂ during carbonization with the increase of TBT content. The absorption edge of TiO₂/CNFs composite material is extended from the ultraviolet region of pure TiO₂ to visible, which can improve the utilization of sunlight. At the same time, after simulated solar irradiation for 180 min, the maximum photocatalytic degradation rate of RhB by TiO₂/CNFs composite material reaches 95.71%. Moreover, the photocatalytic degradation efficiency can still reach about 90% after repeated useage for 5 times.
- TiO₂ /
- carbon nanofibers (CNFs) /
- composite material /
- electron-hole pairs /
- photocatalysis

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图 1 不同TBT添加量的钛酸四丁酯 (TBT)/聚丙烯腈 (PAN) 复合材料((a)~(d))和不同TiO₂含量的TiO₂/CNFs复合材料的SEM图像((e)~(h)

Figure 1. SEM images of TBT/PAN composite with different TBT additions ((a)-(d)) and TiO₂/CNFs composite with different TiO₂ contents((e)-(h)) ((a)PAN; (b)TBT/PAN-1; (c)TBT/PAN-2; (d)TBT/PAN-3; (e)CNF; (f)TiO₂/CNFs-1-47.06%; (g)TiO₂/CNFs-2-94.12%; (h)TiO₂/CNFs-3-125.49%)

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图 2 不同TiO₂质量比的TiO₂/CNFs复合材料的XRD图谱

Figure 2. XRD patterns of TiO₂/CNFs composites with different TiO₂ contents

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图 3 不同TiO₂含量的TiO₂/CNFs复合材料Raman光谱

Figure 3. Raman spectra of TiO₂/CNFs composites with different TiO₂ contents

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图 4 不同TiO₂含量的TiO₂/CNFs复合材料UV-vis漫反射光谱

Figure 4. UV-vis diffuse reflectance spectra of TiO₂/CNFs composites with different TiO₂ contents

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图 5 不同TiO₂含量的TiO₂/CNFs复合材料电化学阻抗分析图(a)和图5(a)中红色方框标记放大图(b)

Figure 5. Electrochemical impedance analysis spectroscopy of TiO₂/CNFs composites with different TiO₂ contents (a) and enlarged red box mark in fig. 5(a) (b)

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图 6 不同TiO₂含量的TiO₂/CNFs复合材料光催化降解图

Figure 6. Photocatalytic degradation analysis diagrams of TiO₂/CNFs composites with different TiO₂ contents ((a) Plots of relative concentration of RhB(C/C₀) versus time (t); (b) Photocatalytic degradation kinetics curve; (c) Photocatalytic kinetics constant; (d) Cyclic degradation curve of TiO₂/CNFs-2-94.12%)

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表 1 TiO₂/碳纳米管(CNFs)复合材料成分

Table 1. Composition of TiO₂/ carbon-nanofibers (CNFs) composite

Sample number	Mass ratio of TBT:PAN	Mass ratio of TiO₂:CNFs/%
CNFs	0	0
TiO₂/CNFs-1-47.06%	1∶1	47.06
TiO₂/CNFs-2-94.12%	2∶1	94.12
TiO₂/CNFs-3-125.49%	3∶1	125.49
Notes: TiO₂/CNFs-a-b: a—Mass ratio of tetrabutyltitanate (TBT) to polyacrylonitrile (PAN) in TBT/PAN composite; b—Mass ratio of TiO₂ to CNFs in TiO₂/CNFs composite.

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表 2 不同TiO₂含量的TiO₂/CNFs复合材料Raman特征峰强度数据

Table 2. Data of Raman characteristic peak intensity of TiO₂/CNFs composites with different TiO₂ contents

TiO₂ content/%	I_D	I_G	I_D/I_G
0	570.7	463.2	1.232
47.06	498.4	409.7	1.216
94.12	441.4	408.5	1.081
125.49	307.8	260.3	1.182
Notes: I_D—D band strength; I_G—G band strength.

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